BusWorks 900EN Series - Modbus TCP/IP 10/100 Industrial ... · 0 1 act 23 st tb1 ch 1 ch10 rtn exc3 exc2 ch 6 gnd tb3 link 10 tb1 11 46 12 14 15 45 43 42 22 2523 32 26 31 exc1 rtn

BusWorks® 900EN Series – Modbus TCP/IP10/100MB Industrial Ethernet I/O Modules

Model 981EN-4012 12 Active-Low Digital InputsModel 982EN-4012 12 Sinking Digital OutputsModel 983EN-4012 12 Tandem Digital Input/Output

USER’S MANUAL

ACROMAG INCORPORATED Tel: (248) 624-154130765 South Wixom Road Fax: (248) 624-9234P.O. BOX 437Wixom, MI 48393-7037 U.S.A.

Copyright 2003, Acromag, Inc., Printed in the USA.Data and specifications are subject to change without notice. 8500-717-D04J008

BusWorks® 981/982/983EN Module User’s Manual Ethernet Digital I/O__________________________________________________________________

_______________________________________________________________________________________Acromag, Inc. Tel:248-624-1541 Fax:248-624-9234 Email:[email protected] http://www.acromag.com

2IMPORTANT SAFETY CONSIDERATIONSYou must consider the possible negative effects of power, wiring,component, sensor, or software failure in the design of any type ofcontrol or monitoring system. This is very important where propertyloss or human life is involved. It is important that you performsatisfactory overall system design and it is agreed between you andAcromag, that this is your responsibility.

GETTING STARTEDMOUNTING AND DIMENSIONS……………………… 3CONTROLS & INDICATORS..………………………… 3ISOLATION BARRIERS..………………………………. 3I/O PULLUP RESISTOR INSTALLATION…………… 4CONNECTIONS…………………………………………. 4

DIN-Rail Mounting And Removal……………… 4Network…………………………………………….. 5Power……………………………………………….. 6Digital Inputs……………………………………… 7Digital Outputs..………………………………….. 8Earth Ground..………………………………….…. 9

WEB BROWSER………………………………………... 10Home Page………………………………………… 10Password Configuration Page.………………... 11Network Configuration Page…………………… 12Test Page………………………………………….. 14

TROUBLESHOOTING………………………………….. 16Diagnostics Table……………………………..…. 16Trouble Browsing Your Module?..................... 17Getting Out Of Trouble………………………….. 17

TECHNICAL REFERENCEKEY FEATURES………………………………………… 18HOW IT WORKS………….…………………………….. 19ABOUT MODBUS TCP/IP….………………………….. 20

IP Addressing…………..…………………………. 20Dynamic Host Configuration Protocol……….. 22Domain Name System (DNS)…………………… 22

MODBUS REGISTERS………………………………… 22Register Functions………………………………. 22Register Mirroring……….……………………….. 23Data Types………………………………………… 24Register Map……………………………………… 25

SPECIFICATIONS………………………………………. 28Model Numbers….……………………………….. 28Digital Inputs…………………....………………… 28Digital Outputs………………..………………….. 28General Specifications………………………….. 29Enclosure and Physical…………………………. 29Agency Approvals…..……………………………. 30Environmental…………………………………….. 30Ethernet Interface………………………………… 31Controls & Indicators……………………………. 31

ACCESSORY CABLES……..…………………………. 32

TABLE OFCONTENTSSymbols on equipment:

Means “Refer to User’sManual (this manual) foradditional information”.

The information of this manualmay change without notice.Acromag makes no warrantyof any kind with regard to thismaterial, including, but notlimited to, the impliedwarranties of merchantabilityand fitness for a particularpurpose. Further, Acromagassumes no responsibility forany errors that may appear inthis manual and makes nocommitment to update, orkeep current, the informationcontained in this manual. Nopart of this manual may becopied or reproduced in anyform without the prior writtenconsent of Acromag, Inc.

Windows® is a registeredtrademark of MicrosoftCorporation.

!

BusWorks® 981/982/983EN Module User’s Manual Ethernet Digital I/O___________________________________________________________________


3

44 41 33

PWR

NET

WO

RK

13

CH

1

16

RTN

21 24

CH

6

TB3

TB1

CH

10

EXC

3

EXC

2

GN

D

46 4345

RX

42

DC

-

DC

+

32 31

TB1

11 1412

CH

2

CH

0

TB2

2215

CH

4

CH

3

TX

5V/3V

TB4

TB4

25 2623

CH

7

CH

5

RTN

DCPWR

EXC

1R

TN

CH

9

CH

11

TB2

CH

8

DIGITAL I/O

DIGITAL IN or OUT

DIGITAL I/O

DIGITAL IN or OUT

DIGITAL I/O

DIGITAL IN or OUT

TRANSFORMER

TB3

981/982/983ENISOLATIONDIAGRAM

TRANSFORMER

46 44 43 41 33

DC

-

32

9

5 6

1 20

11

7

3

TB1

EXC

111

RTN

CH

1

13

CH

10

CH

2

14

CH

9

RTN

16

EXC

3 TB4

TB4

EXC

2

21

CH

4

22

CH

6

24

GN

D

CH

7

25

TB3

CH

. I/O

STA

TUS

RST

ACTLINK

ST

45 42

PWR

DC

+

31

LC

8

4

RUN

10

3.7

5(9

5.3)

TB1 C

H 0

12

CH

11

TB2

TB2C

H 3

15

CH

8

CH

5

RTN

2623

TB3

4.6

8(1

18.9

)

3.90(99.1)

ETHERNET

DFT

DIGITAL IN or OUT

2.3

4(5

9.4)

DIGITAL IN or OUT

Acromag

DIGITAL IN or OUT

1.05(26.7)

"T" RAIL DIN MOUNTING DIN EN 50022, 35mm 4.35

(110.5)NOTE: Dimensions Are INCHES (MILLIMETERS).

MODEL 981/982/983EN ENCLOSURE DIMENSIONS

Model 983EN-4012 Shown(981EN-4012 & 982EN-4012 Similar)

98

54

RST

11

6 7

13

44

16

41

21 24

33

10

ACT

2 3

ST

TB1 C

H 1

CH

10

RTN

EXC

3

EXC

2

CH

6G

ND TB

3

LINK

10

TB1

11

46

12 14 15

45 43 42

22 2523

32

26

31

EXC

1R

TN

CH

0

CH

2

CH

3

CH

11

CH

9 TB4

CH

8

TB2 C

H 4

CH

7

CH

5

DC

-

RTN

DC

+

TB3

CH

. I/O

STA

TUS

ETHERNET

DFT

RUN

TB2

TB4

(PLUG-IN TYPE)TERMINAL BLOCKS

RJ45 ETHERNETCONNECTOR

ETHERNET ACTIVITYLED (YELLOW) ANDLINK LED (GREEN)

I/O LED's (YELLOW) -ON WHEN OUTPUTS ARECONDUCTING OR INPUTSARE ASSERTED LOW.

Acromag

RUN/PWR LED (GREEN)

DIGITAL IN or OUT

PWR

REMOVABLE

RESET/DEF ADDRESSTOGGLE SWITCH:TOGGLE RIGHT TO RESETTOGGLE LEFT TO SETDEFAULT ADDRESS

MODULE STATUSLED (YELLOW)

DIGITAL IN or OUT

Model 983EN-4012 Shown(981EN-4012 & 982EN-4012 Similar)

DIGITAL IN or OUT

The toggle switch is used to toggle the module into or out of Default Mode(toggle left), or to reset the module (toggle right). In Default CommunicationMode, the yellow ST LED blinks slowly and the module assumes a fixedstatic IP address of “128.1.1.100”, a default subnet mask of “255.255.255.0”,a default username of “User”, and a default password of “password00”.

MOUNTING ANDDIMENSIONSUnit mounts to “T” type DINrails (35mm, type EN50022).

Units may be mounted side-by-side on 1-inch centers.

WARNING: IEC SafetyStandards may require thatthis device be mounted withinan approved metal enclosureor sub-system, particularly forapplications with exposure tovoltages greater than or equalto 75VDC or 50VAC.

CONTROLS &INDICATORSGreen Run LED is ON if poweris on and will blink in “wink” IDmode.

Yellow ST LED blinks ON/OFFslowly if module is in defaultcommunication mode andblinks rapidly if a watchdogtimeout has occurred.

Yellow I/O LED’s turn ON ifcorresponding output switch isclosed, or input asserted low.

Green LINK LED ON if auto-negotiation has successfullyestablished a connection.

Yellow ACT LED signals PHYnetwork Activity (busy).

ISOLATION BARRIERSDashed Lines denote isolationbarriers.

The I/O circuit, network, andpower circuit are isolated fromeach other for safety and noiseimmunity.



4

TB1

TB4

R7

X1

X3

CH

. I/O

STA

TUS

9

5 6

1 2

10

1 2

CH7

3 4 5 6 7 8 2 3

7 6

5 6

CH1

4 3

CH9

8

1

ETHERNET

ACT

ST

Acromag

EXC+

RTN

RTN EXC+

TB2

EXC+

RTN

TB3

X2

R2

LINK

DFT RST

0

11

7

3

8

4

RUN

RESISTORNETWORK

1 4

CH3CH2CH5 CH4

8 5

CH10CH11

7

CH0

2

CH8

PORT 1 PORT 0

R11

PORT 2

USE SMALL SCREW DRIVERTO PRY OFF SIDE COVER.COVER IS HELD IN PLACEWITH EIGHT SNAP PINS.

BASE BOARD

SOCKET

BOURNS 4308H-102-562OR EQUIVALENT

WHEN REPLACING COVER,ALIGN ALL PINS, THEN SNAPTOGETHER IN SEQUENCETO SECURE COVER.

CH6

PLUG-IN I/O BOARD(Turned Face Up)

CAREFULLY SEPARATEI/O BOARD FROM BASEBOARD.

PORT 1(CH4-7)

PORT 0(CH0-3)

PORT 2(CH8-11)

CAUTION: HANDLE CIRCUITUSING ESD-SAFE PROCEDURES.

981EN/982EN/983EN SHOWNWITH SIDE COVER REMOVEDAND I/O BOARD SEPARATED

PULLUPS ARE LOCATED IN SOCKETSON PLUG-IN I/O BOARD AS SHOWN HERE

5.6K x4 ISOLATED0.5W RESISTORS SERIES 981PB/982PB/983EN SIP

PULLUP RESISTOR SOCKET LOCATION

EACH PORT HAS A SIP RESISTORLOCATED AS SHOWN AT RIGHT.SIP RESISTORS PULL-UP THE I/OCHANNEL TO THE EXC SUPPLY. SIPS ARE INSTALLED IN SOCKETSX1, X2, AND X3. PORT 0 SIP = R2 INSTALLED IN X1PORT 1 SIP = R7 INSTALLED IN X2PORT 2 SIP = R11 INSTALLED IN X3 THE SIP IS AN ISOLATED RESISTORNETWORK OF 4 ELEMENTS.FACTORY SIP VALUE IS 5.6K OHMS.POWER IS 0.5W PER ELEMENT. THE EVEN-NUMBERED PINS OFTHE SOCKETS ARE TIED TO THEPORT EXCITATION TERMINAL. WHEN REPLACING SIPS ORCHANGING VALUES, WATCHTHAT POWER DISSIPATIONDOES NOT EXCEED SIP RATING.

45 44 42 41 33

DC

+

31

12 13 15 16 21 23 24 26TB1

GN

D46 43

PWR

DC

-

32

11 14 22

TB4

25

TB3

TB3

PUSH

TB2

"T" TYPE DIN RAIL

PUSH SCREWDRIVER AS SHOWNTO TILT AND LIFT MODULE OFF RAIL

Remove Terminal Blocks On ThisSide To Provide Clearance

Any Series 9XXEN Ethernet Module

MODULE REMOVALFROM DIN RAIL

PRY WITH SCREWDRIVERINSERTED IN SLOT HERE(DO NOT TWIST TO AVOIDDAMAGING PLASTIC TAB)

USE YOUR FINGER TO APPLYDOWNWARD PRESSURE HEREAS YOU LIFT AND TILT MODULETO REMOVE IT FROM RAIL

To Remove or Replace Factory Pullup Resistors…

Locate pullup resistor SIP’s installed in sockets of plug-in I/O board asshown above. You must remove the right side cover and separate the twoboards to remove or install these resistors. 5.6K resistor SIP’s are installedfrom the factory. Remove these resistors if I/O channels are pulled upexternally. Limit power in each SIP resistor to less than 0.5W.

When attaching the module to theT-type DIN rail, angle the top of theunit towards the rail and locate thetop groove of the adapter over theupper lip of the rail. Firmly push theunit towards the rail until it snaps intoplace. To remove, first separate theinput terminal block(s) from thebottom side of the module to create aclearance to the DIN mounting area.Next, while holding the module inplace from above, insert ascrewdriver into the lower arm of theDIN rail connector and use it as alever to force the connector downuntil the unit disengages from the rail(do not twist the screwdriver to avoiddamaging plastic).

I/O PULLUPRESISTORINSTALLATIONYou must connect excitationand/or install pull-ups forproper I/O operation. I/Oterminals must not be leftfloating.

5.6KΩ I/O pull-up resistors arealready installed from thefactory. You do not need torefer to this information unlessyou need to change or removethese resistors.

If your application deliverspower to the I/O terminalsrather than the excitationterminal, the internal pull-upsshould be removed to avoidcoupling current into adjacentport channels.

CONNECTIONSDIN-RailMounting & Removal



5

1

87

54

21

100M100M

CLIP

8

6

3

CABLE

81

10Base-TCAT 5 UTP/STP

Not UsedNot Used

Not UsedNot Used

Receive -Receive +

RJ-45 CONNECTOR

SPEED

PIN

DISTANCE

Transmit -

Transmit +

MDI-X WIRING

100Base-TCAT 3, CAT 4, or CAT 5 UTP/STP

Note Crossover ConnectionsMINIMUM RECOMMENDED CABLE

Not UsedNot Used

Not UsedNot Used

Transmit -Transmit + ETHERNET PORT

RJ45 MDI AND MDI-X CONNECTIONS

Receive -

Receive +

MDI WIRING

The Ethernet port of this module is wired MDI and does not includeautomatic crossover. The Ethernet port of your PC is also wired MDI andmay not include automatic crossover. As such, you must use a crossovercable like that shown below when connecting this device directly to a PC.

1

1

3

6

1

6

23

1

82

81

8

8

1

PINS: 1 TO 32 TO 63 TO 16 TO 2

RJ45 (Clip Side Down) RJ45 (Clip Side Down)

FOR DIRECT PC TOETHERNET MODULECONNECTIONS

CROSSOVER CABLEFOR MDI TO MDIOR MDI-X TO MDI-X CROSSOVER

CONNECTIONS

910

5 6

1 2

CH

. I/O

STA

TUS

ACT

8

4

0

RUN

DA

11

7

3

ST

ETHERNET

Acromag

RS

LINK

HOST PC

(Use Crossover Cable)

CAT-5 UTP CABLEUP TO 100 METERS

Order Acromag Cable Model 5035-360

Note: This MDI-to-MDI connection requires the use of a crossover cable.HOST PC CONNECTED DIRECTLY TO A MODULE

Acromag 983EN-4012Ethernet Module. The ethernet port of thismodule is not automaticMDI/MDI-X crossoverand is wired MDI.

CONNECTIONSNetworkFor 100Base-TX systems, at aminimum, use data gradeUnshielded Twisted-Pair(UTP) wiring that has a 100Ωcharacteristic impedance andmeets the EIA/TIA Category 5wire specifications.

It is recommended that youuse a crossover CAT-5 cableto connect this device to yourPC.

For 10Base-T systems, youmay use Category 3, Category4, or Category 5/5E UTP/STPcable.

In either case, you are limitedto 100 meters between anytwo devices.

A crossover cable simplyconnects the differentialtransmit pair on each end, tothe receive pair on theopposite end.

Use a standard (direct) cablewhen connecting to a hub orswitch port, which aregenerally wired MDI-X.



6

S1 S2

DC

-

33

DC

+

32

RS

109

65

21 3

98

54

10

DA

11

7

2 3

ST

8

4

0

10

76

2 3

ST

98

54

10

DA

11

7

2 3

ST

100M

LK /

P1

X3 X4

TB3

CH

. I/O

STA

TUS

ACT

ACT

CH

. I/O

STA

TUS

RUN

X5

X5

X4

X1G

ND

34

DC

+

31

8

4

0

RUN

DA

LINK

11

7

ST

LINK

10

6

DARS

LINK

9 11

5

1

RS

LINK

10

6

RUN

CO

L

AC

T

X5

X3

X2

X1 X2

PGMPORT

PU

SH

TO RE

SE

T

ACT

ACT

ETHERNET

Acromag

CH

. I/O

STA

TUS

CH

. I/O

STA

TUS

POWER

RS

RUN

RUN

ETHERNET SWITCH

Acromag

ETHERNET

ETHERNET

Acromag

Acromag

ETHERNET

Acromag

HOST PC

Acromag 9xxEN-4012Ethernet Modules. The ethernet port of thesemodules are not automaticMDI/MDI-X crossover, butthe use of an auto-crossingswitch eliminates the needto make a distinction betweenstraight-through and crossovercables.

(Straight-Through or Crossover Cable)



Order Acromag Cable Model 5035-355


ETHERNETSWITCH

DIP SW S1/S2CFG OPTIONS






The ethernet port of the PC isgenerally not automatic MDI/MDI-Xcrossover and is wired MDI.

Because the Acromag ethernet switch900EN-S005 is automatic MDI/MDI-Xcrossover, use of a direct (straight-through)or crossover cable is permissible.

IMPORTANT: IF THE HOST PC CONNECTS DIRECTLY TO THE MODULE,YOU MUST USE A CROSS-CONNECT CABLE (MDI-X), AS BOTH THE PCAND THE 9XXEN MODULE ETHERNET PORTS ARE WIRED MDI. ETHERNET SWITCHES AND HUBS ARE WIRED MDI-X.THE ACROMAG ETHERNET SWITCH IS AUTOMATIC MDI/MDI-X ANDELIMINATES THE NEED FOR MAKING A DISTINCTION BETWEENTHE USE OF STRAIGHT-THROUGH (MDI) AND CROSSOVER (MDI-X)CABLE CONNECTIONS.

Acromag 900EN-S0055-Port Ethernet Switchor equivalent. The ethernet ports of thisswitch are automatic MDI/MDI-Xcrossing and do not requirecrossover cables.

USE OF AN ETHERNET SWITCH TO NETWORKA HOST PC TO MORE THAN ONE MODULE

Acromag offers a straight-through patch cable (Model 5035-355), or acrossover cable (Model 5035-360) for use with Series 9xxEN modules.

Refer to the Accessory Cables section at the back of this manual for moreinformation on accessory cables including patch and crossover cablesavailable from Acromag and other vendors.

TIP: You can significantly enhance the EMI/RFI performance of yournetwork connections by using Category 5E STP cable (Shielded TwistedPair) with shielded RJ45 plug connectors. This will also help to protect yourinstallation from damage due to ESD (Electro-Static Discharge). The use ofshielded cable is strongly recommended for installations in harsh industrialenvironments and/or in the presence of strong electrical fields.

You can use an Ethernet switch or switching hub to build a network ofEthernet modules, similar to that shown below. This drawing shows how tonetwork-connect these modules to a 5-port Ethernet switch (Acromag Model900EN-S005). Note that the 900EN-S005 switch includes automaticMDI/MDI-X crossover and straight-through or crossover cable(s) may beused, but it is generally not good practice to use crossover cables whenconnecting to an auto-crossing switch.

Connect 15-36V DC to the power terminals labeled DC+ & DC-.Observe proper polarity. For supply connections, use No. 14 AWGwires rated for at least 75°C. CAUTION: Do not exceed 36VDC peak.

+

TB3

PWR

33 GND

DC+31

EARTHGROUND

15 TO 36VDC

DC-32

TB3INPUT POWERIS ISOLATED

CAUTION: Risk of Electric Shock – More than one disconnect switch maybe required to de-energize equipment before servicing.

CONNECTIONS

Network

Power

Voltage Current15VDC 123mA18VDC 106mA24VDC 80mA36VDC 59mA



7

5.6K

ROFF (0)

+5V

ON (1)

I/O

100K

ON (1)

RTN

I/O

EXC

TO OTHER 3CHAN OF PORT

5.6K

100KON (1) R

ON (1)

OFF (0)

OFF (0)

SIP RESISTORINSTALLEDIN SOCKET

TVS(48V)

EXC

(Active-LOW)

+5V

RTN

(Active-LOW)


CHLED

OFF (0)


TVS(48V)

ON (1) OFF (0) CHLED

SIMPLIFIED 983PB CHANNEL (Tandem Input/Output)SIMPLIFIED 981PB CHANNEL (Input Only)

IMPORTANT – External Fuse: If unit is powered from a supply capable ofdelivering more than 1A to the unit, it is recommended that this current belimited via a high surge tolerant fuse rated for a maximum current of 1A orless (for example, see Bel Fuse MJS1).

Connect digital input signals to the input terminals (see figures below):

16 RTN

1513

12

TB1

OR

+5V

1411 EXC

5.6K

100K

DIG

ITA

L IN

or O

UT

CH03

CH01CH00

OPENCOLLECTOROR DRAIN

TB1

CH02

+5V

983EN SIMPLIFIED INTERNAL I/OCONNECTIONS (ONE CHANNEL)

LOW-SIDESWITCH

PULLUP(IN SOCKET)

SHIELDED CABLE

DIGITAL INPUT CONNECTIONS

Refer to the examples below for examples of other types of inputconnections.

I

I/O R

RTN

100KV

N.O. 983ENONLY

+5VEXC5.6K

CH

OTHER THREECHAN OF PORT

CH LED IS ON FORACTIVE-LOW INPUT

ON 983EN UNITS, MAKESURE OUTPUT IS OFF(0) FOR INPUT ONLYAPPLICATIONS.

SIP INSTALLED

981EN & 983EN

DRY-CONTACT RELAY CONNECTIONS - NORMALLY OPEN

ADJUST VOLTAGE (V) ASREQUIRED TO CHANGEEXCITATION CURRENT( I)OR CHANGE SIP RESISTORVALUE.

RV I/O

N.C. +5V

EXC

100K

RTN

983PBONLY

OTHER THREECHAN OF PORT

5.6K

CH

ADJUST VOLTAGE (V) ASREQUIRED TO CHANGEEXCITATION CURRENT( I)OR CHANGE SIP RESISTORVALUE.

CH LED IS ON FORACTIVE-LOW INPUT

ON 983EN UNITS, MAKESURE OUTPUT IS OFF(0) FOR INPUT ONLYAPPLICATIONS.

SIP INSTALLED

981EN & 983EN

DRY-CONTACT RELAY CONNECTIONS - NORMALLY CLOSED

CONNECTIONS

Digital Inputs(981EN & 983EN Only)

Inputs are active-low.

Input threshold is TTLcompatible.

Limit Input Voltages to35V maximum.

Note: Do not allow EXC orunused inputs to float. If pull-ups are installed, this willcause one I/O signal to pull theother floating port channels viathe pull-ups and common EXClead connection.

Normally Open Dry ContactRelay.

Normally Closed Dry ContactRelay.



8

ON (1)

5.6K

R

EXC

R

+5V

OFF (0)

RTN

OFF (0) TVS(48V)

100KON (1)

CHLED

I/O

CHLED

OFF (0)

EXC

ON (1)

5.6K

OFF (0)

RTN

OFF (0) TVS(48V)


ON (1)

ON (1)I/O

(Active-LOW)


(Active-LOW)



SIMPLIFIED 983EN CHANNEL (Tandem Input/Output)SIMPLIFIED 982EN CHANNEL (Output Only)

LIMON

RTN

5.6K

983EN

100K OFFOFF

ON

5V

R

I/O

EXC


OFF

+5V

R

CHON

RLIM IS INCLUDED TOPROTECT DRIVER IFTANDEM OUTPUT ISINADVERTANTLYTURNED ON.


981EN or 983EN

ON 983EN, KEEP OUTPUTS TURNED OFFTO MONITOR EXTERNAL LOGIC SIGNAL

LOGIC (TTL) MONITOR (981EN & 983EN ONLY)

Connect digital outputs to the output terminals. Refer to figures below:

V

L

D

A

A

B ON

V

V

OUT3OUT2

OUT1

15 CH03

14 CH02

12 CH00

11 EXC +5V

0-35V D

OUT0

L

TB1

16 RTN

13 CH01

TB1D

IGIT

AL

IN o

r OU

TSHIELDED CABLE

OFF

0-35V

OUTPUTS RATEDTO 35V/500mA DC

EARTH GROUND

5.6K

100K

FOR GREATER OUTPUT DRIVE,CONNECT AN INTERPOSING RELAY

INTERNAL OUTPUTPULLUPS ARE OPEN

OPEN-DRAIN OUTPUTSSHARE RETURN

PULLUP(IN SOCKET)

983EN SIMPLIFIED INTERNAL I/OCONNECTIONS (ONE CHANNEL)

DIGITAL OUTPUT CONNECTIONSPOSSIBLE VARIATIONS - CURRENT SINKING DC APPLICATIONS ONLY

IMPORTANT – Add Protection With Inductive Loads: Outputs alreadyinclude internal reverse-bias shunt diodes to help protect the output switchfrom damage due to the high reverse-bias voltages generated whenswitching inductive loads. You should add external protection near theinductive load to prevent these transients from being sent along theconnection wires. Place a diode (1N4006 or equivalent) across an inductiveload with the cathode to (+) and the anode to (-).

CONNECTIONSDigital Inputs(981EN & 983EN Only)Digital TTL Logic Monitor


Digital Outputs(982EN & 983EN Only)

Outputs are the open-drains ofDMOS mosfet switches for DCcurrent-sinking applicationsonly.

Outputs turn OFF (open)following a software or power-on reset of the module.



9

CH

V

+5V

ON

RTN

5.6K

100K OFF

983EN

I/O

EXC


OFF

R5-35V

1N4006

RELAY COIL/SOLENOID DRIVER

ON


982EN/983EN

V

ON

R

100K

5.6K

CH

OFF

5-35V I/O

EXC

OFF

ON

+5V

983EN


RTN

982EN/983EN


INCANDESCENT LAMP CONTROL

V

ON

R

100K

5.6K

CH TOLOAD/LINE

LED ON

+5VR

RTN

982EN/983EN

OFF

I/O

(N.O.)SSR

EXC TOLOAD/LINE

OFF


983EN


SOLID-STATE RELAY (SSR) OR LED DRIVER

Refer to the examples below for other types of output connections.

Note: Per UL, when the outputs are used to control interposing relays forswitching AC and DC devices of higher voltage/current, the coil ratings forthe interposing relay shall not exceed 24VDC, 100mA.

Connect Earth Ground as shown in the connection drawings above.Additionally, connect the GND terminal (TB3-33) to earth ground.

The ground connections noted are recommended for best results. Ifsensors are already grounded, use caution and avoid making additionalground connections which could create ground loops.

The plastic module housing does not require earth ground.

CONNECTIONSDigital Outputs(982EN & 983EN Only)

Examples:- Solid-State Relay (SSR) or LED Driver- Relay Coil or Solenoid Driver

(Note Protection).- Lamp Driver.

Earth Ground

Warning: To comply withsafety and performancestandards, use shielded cableand connect earth ground asnoted. Failure to use goodwiring and grounding practicesmay be unsafe and hurtperformance.



10This module supports Modbus over TCP/IP. You may use your ownsoftware to issue Modbus commands to this module (see ModbusRegisters), or you may use a standard web browser, as these modules havebuilt-in web pages that allow you to setup and control the module. Simplyexecute your web browser, type the IP address assigned to your module inthe “Address” window (http://128.1.1.100/ for our example), click [Go], andyou will be presented with a Home Page window similar to that shown below:

The Home Page provides buttons to access the other web pages of thismodule that are used to configure the network parameters, change the username and password, and operate the module. For each new browsersession that accesses the Home Page of this module, you will be presentedwith a window prompting you to enter the current User Name and Passwordas shown below. This information is required before the program will allowyou to make any other selections. The default user name and passwordis “User” and “password00” respectively. After entering these defaults,you may wish to invoke the Password Configuration Page to change theseparameters to something more meaningful for you.

IMPORTANT: If you forgetyour user name andpassword, you can alwaystoggle the module intodefault mode via the defaultmode toggle switch at thefront of the module, and thepassword and username willrevert to the original defaultsnoted above, thus allowingyou to re-invoke thePassword ConfigurationPage and change theusername and password asrequired.

WEB BROWSER

Home Page



11

Use the scroll bar on the right to scroll down the page as shown below:

Use up to 20 alphanumeric characters (case sensitive) to specify yourusername, and 10 alphanumeric characters (case sensitive) to specify apassword. You will have to type in these entries twice to help prevent errors.

Click the submit button to write your changes to the module.

After completing your username/password changes, click on the appropriatebutton at the bottom of the page to select another web page. If you madechanges, you may be prompted to re-enter your new username andpassword before being permitted to move to other pages.

WEB BROWSER

PasswordConfiguration Page



12After setting your username and password, you can click the “NetworkConfiguration Page” button to set the network configuration parameters forthe module. You may have to consult your network administrator tocomplete the contents of this page.

Use the scroll bar on the right to scroll down the page as shown below:

An IP Address is a unique identification number for any host (this module)on any TCP/IP network (including the internet). The IP address is made upof four octets (8 bits), each octet having a value between 0-255 (00H-FFH).It is expressed here in decimal form, with a period placed between octets.

WEB BROWSER

Network Configuration

Note that Acromag Series9xxEN Ethernet I/O modulesmay take from 3 to 30 secondsto boot upon power-up,depending on your networkconfiguration and whether aDHCP server is present.



13A Static IP Address is as the name implies—static, and represents a uniquefixed IP Address that is generally assigned by your service provider orsystem administrator. The Default Mode static IP address assigned to thismodule is 128.1.1.100 (refer to product side label).

NOTE: In order to network your PC with an Acromag module, you may haveto consult with your network administrator and either temporarily changeyour TCP/IP configuration (see TCP/IP Properties of Network Configurationin Windows), or create a separate private network using a second networkadapter installed in your PC (recommended). The necessary steps will varywith your operating system. Refer to Acromag Application Note 8500-734 tohelp accomplish this (located on the CDROM shipped with your module orvia download from our web site at www.acromag.com).

The Number of Sockets refers to the number (1-10) of Modbus TCP/IPaccess points to allow for this host. The default allows up to 10 sockets, butyou can restrict access by reducing this number. Internally, the module usesport number 502 which is reserved for Modbus.

The DNS Server refers to the IP address of the Domain Name Server usedon this network. A DNS server relates symbolic names to actual numeric IPaddresses, while the DHCP server is responsible for dynamically passing outIP addresses.

A Subnet Mask is used to subdivide the host portion of the IP address intotwo or more subnets. The subnet mask will flag the bits of the IP addressthat belong to the network address, and the remaining bits correspond to thehost portion of the address. The unique subnet to which an IP addressrefers to is recovered by performing a bitwise AND operation between the IPaddress and the mask itself, with the result being the sub-network address.

Gateway refers to the IP Address of the gateway, if your local area networkhappens to be isolated by a gateway. Typically, it is assigned the first hostaddress in the subnet. If a gateway is not present, then this field shouldcontain an unused address within the host subnet address range.

The Host Name is the name to be assigned to this host if its addresshappens to be assigned dynamically using DHCP.

The Active IP Address refers to the current IP Address being used by thishost, as opposed to any new assignments being made via this page.

The MAC Address refers to the Media Access Control Address thatuniquely identifies the hardware of this device. This is a unique fixedaddress assigned to this module at the factory. In IEEE 802 networks, theData Link Control (DLC) layer of the OSI Reference Model is divided into twosublayers: the Logical Link Control (LLC) layer, and the Media AccessControl (MAC) layer. The MAC layer interfaces directly with the networkmedia (each different type of network media requires a different MAC layer).

By default, the module is setup to use Static IP Addressing and a Static IPAddress of 128.1.1.100. You can optionally choose to have the IP addressassigned dynamically via DHCP/BOOTP, or DHCP/BOOTP w/Fallbacks.This will also require that you specify a valid Host Name. Note thatDHCP/BOOTP w/Fallback will revert to the static IP address if your DHCP orBOOTP server cannot be found at the address specified.

WEB BROWSER

Network ConfigurationThis module can be placedinto a default communicationmode via the DFT toggleswitch at the front of themodule.

Default Mode uses a static IPaddress of “128.1.1.100”, adefault subnet mask of“255.255.255.0”, a defaultusername “User”, and adefault password“password00”.



14In general, BOOTP (BOOTstrap Protocol) refers to an internet protocol thatenables a diskless workstation to discover its own IP address, the address ofa BOOTP server on the network, and a file to be loaded into memory to bootthe machine. This enables the workstation or device server to boot withoutrequiring a hard or floppy disk drive. BOOTP works similar to DHCP, but isusually found in older systems. This protocol is defined by RFC 951.

DHCP (Dynamic Host Configuration Protocol) refers to a protocol forassigning dynamic IP addresses to devices on a network. With dynamicaddressing, a device can have a different IP address every time it connectsto the network. In some systems, it can even change while it is stillconnected. DHCP also supports a combination of static and dynamic IPaddresses. DHCP/BOOTP with fallback will revert to static IP addressing ifthe DHCP or BOOTP server cannot be found.

The unit includes a default address toggle switch to cause the module toassume a fixed default static IP address (128.1.1.100). This switch is at thefront of the module and is used to toggle the module into, or out of DefaultMode. If you use the toggle switch at the front of the module to place themodule in default mode, then “Default Communications Mode” will beindicated at the bottom of this screen.

Click the Submit button to complete any changes made on this page.

Click the Wink On/Off button to toggle the module in/out of “wink” ID mode.In this mode, the module’s green RUN LED will blink to confirm identification.

Refer to the Technical Reference section of this manual to learn more aboutIP Addressing terms and concepts.

After completing username and password assignment, plus the networkconfiguration parameters, you can use the Test Page to operate yourmodule. The Test Page will allow you to read inputs, turn outputs on and off,configure the watchdog timer, and set watchdog timeout states.

WEB BROWSER

Network Configuration

The Default CommunicationMode uses a static IP addressof “128.1.1.100”, a defaultsubnet mask of“255.255.255.0”, a defaultusername of “User”, and adefault password of“password00”.

Test Page



15Use the scroll bar on the right to scroll down the page as shown below:

Note that the 12 channels of this module are divided into 3 groups (ports) of4 channels each. Each port represents one pluggable I/O terminal block (6screws). Port Number 0 refers to I/O channels 0-3, port number 1 refers tochannels 4-7, and port number 3 to channels 8-11. The state of a channel isindicated by the color of the simulated LED’s and the text “ON” or “OFF”.These states also reflect the actual yellow I/O status LED’s of the module.

IMPORTANT: The input state indication only reflects the state of the inputsat the moment this screen is invoked and this does not continuously update.You can click your browser’s refresh button to get a new input update. Theoutput states are updated each time you click the channel’s On/Off button.

You can use the On/Off buttons adjacent to the channel number to turn theoutputs of 982EN and 983EN modules ON or OFF. The output stateindication is updated each time you click On/Off.

A watchdog timeout is triggered at the port if no channel read or write occursfor one or more channels of a port within the time period specified. You canuse the Port watchdog Timer Control to specify Time from 0001H to FFFEHseconds (1 to 65534s). A Time value of 0000H or FFFFH (0 or 65535) willdisable the timer for the port I/O. You can also define the state the outputsare to assume following a timeout via the lower 4 bits of the 16-bit valueentered into the State field for the port. Enter FFFFH into the State field toleave the port outputs unchanged following a timeout. Note that the lowerorder bit (bit 0) corresponds to the lowest channel number for the port, bit 1to the next channel number, and so on. Except for FFFFH, the first threehexadecimal digits of State are ignored (each port has only 4 channels andthe least significant nibble (4-bits) of the State value are all that’s required forcontrol. For example, Enter a state value of “0000” to turn OFF (open) allport outputs (failsafe state) upon watchdog timeout. You would enter “000F”to turn all port outputs ON upon watchdog timeout.

WEB BROWSER

Test Page

TIP: Viewing a module’s webpage is treated similar toviewing a web page on theinternet. The first time youopen a page, its image isstored as a temporary internetfile in PC memory. However,each subsequent attempt toview that page will need toautomatically update thatimage, especially whenmaking configuration changes.With Internet Explorer, clickthe “Internet Options” of the“Tools” menu, select the“General” tab, locate the“Temporary Internet Files”information and click on the“Settings” button. Then select“Automatically” under “Checkfor newer versions of storedpages:”. Then click [OK] toreturn to the “General” screen,and click [OK] again to saveyour settings.



16Upon power-up, the green “Run” LED should light. This indicates the unit isoperating normally. A continuous blinking Run LED indicates “wink” IDmode. If the Run LED remains OFF and correct power has been applied,then either the internal power supply has failed or a fatal processor error(firmware) has occurred.

SYMPTOM POSSIBLE CAUSE POSSIBLE FIXGreen RUN LEDdoes not light.

Internal +3.3V powerhas failed.

Return module for repair.

Continuous flashinggreen RUN LED.

Module in “wink”mode.

Read Module Status registerto verify “wink” status. Write5555H to Wink ModeToggle Register to togglewink mode off/on.

Cannotcommunicate.

Power ON at themodule?

Check power. Is greenRUN LED ON?

Connecting cable isnot a crossovercable.

TIP: To check cable,hold both ends insame position andread the wire colorsthrough the clearportion of the plugfrom left to right. Ifcolors are arranged inthe same order, youhave a straight cable.

This module’s ethernet portis wired MDI. You must usea crossover cable whenconnecting this module toyour PC or another devicealso wired MDI. If you areconnecting to an Ethernetswitch or hub, then a directcable is used.Note: If your Link LED isON, you have connectedusing the correct type ofcable, but it could still bedefective.

Wrong IP Address Change the IP address ofthe module or the PC sothat both match. Try thedefault module address of128.1.1.100.

ManyCommunicationErrors.

Is cable segmentlonger than 100M?

Max distance between twonodes is limited to 100meters with approved cable.

Correct Cable? Shielded CAT-5/5E cable orequivalent is recommended.

Missing earth groundconnection.

Connect earth ground toTB3-33 GND terminaladjacent to power terminal.

Outputs NotWorking.

Missing excitationconnection?

Connect an excitationsupply between the portEXC and RTN terminals

Missing pull-upresistors?

Install SIP resistor in socketof board for port of interest,or pullup outputs externally.

Cannot BrowseModule.

Your browser may besetup to use a proxyserver for LANcommunications.

Temporarily disable the useof a proxy server by yourbrowser (see procedure ofnext page).

TROUBLE-SHOOTING

Diagnostics Table

If your problem still exists afterchecking your wiring andreviewing this information, or ifother evidence points toanother problem with the unit,an effective and convenientfault diagnosis method is toexchange the module with aknown good unit. Acromag’sApplication Engineers canprovide further technicalassistance if required.Complete repair services arealso available from Acromag.



17Please refer Acromag Application Note 8500-734 for help in setting upnetwork communication with your module (located on the CDROM shippedwith your module or via download from our web site at www.acromag.com).This document gives details for changing your PC’s TCP/IP configuration inorder to communicate with your module (see TCP/IP Properties of NetworkConfiguration in Windows).

If you have carefully followed this procedure and you still cannot browse yourmodule, you may have the web browser of your laptop or PC setup to use aproxy server when browsing the web. If you are using Internet Explorer,Refer to the “Tools” pulldown menu, select “Internet options…”, click the“Connections” tab, then click the “LAN Settings” button. Locate the Proxyserver information and uncheck the box next to the statement “Use a proxyserver for your LAN”. Then click [OK] to return to the “Connections” screen,and click [OK] again to save your settings.

You should now be able to use Internet Explorer to browse the module asrequired. However, to later restore your PC’s connection to your companynetwork, you may have to re-enable the use of a proxy server for your LAN.

There is no built-in error detection to prevent you from writing invalid valuesto a configuration register. As such, if you inadvertently write an invalid valueto an internal register, you could cause the module to become inoperableunder certain conditions. If this happens, in order to regain control of themodule, the module can either be re-downloaded at the factory, or you cantry restoring the module to its initial configuration by following this procedure:

Procedure For Restoring any 9xxEN Module to its Initial Configuration

1. While module power is OFF, press and hold the front-panel toggleswitch in the default (DFT left) position.

2. While continuing to hold the toggle switch in the default position, applypower to the module.

3. After a few seconds, the Status LED will begin to blink quickly and youcan release the default switch at this point. The module will continue toboot itself as it normally does. That is, the green RUN LED will blink for1-10 seconds as the unit acquires its address, then remain ON fornormal operation.

4. If the STATUS LED fails to blink rapidly after a few seconds and theRUN LED just blinks for a few moments as it normally does, thenreinitializing the module has failed and you should try it again. Thistime, make sure that the DFT switch is completely depressed and heldwhile powering the unit. Also make sure that you are pressing the DFTtoggle in the DFT direction (left), rather than the RST direction (right).

TROUBLE-SHOOTING

Trouble Browsing YourModule?

Getting Out Of Trouble

So, your module’s “gone wild”,follow this procedure to restoreit to its initial configuration andregain control.



18TECHNICAL REFERENCE• Safety Agency Approvals – CE, UL, & cUL listed, plus Class 1;

Division 2; Groups A, B, C, D approval.• Fully Isolated – I/O channels, network, and power are all isolated from

each other for safety and increased noise immunity.• Modbus TCP/IP Protocol Support – Supports up to 10 sockets/

masters (maximum number is user-selectable) using port number 502(Modbus TCP/IP Default).

• Flexible IP Addressing – Supports static, DHCP, or BOOTP.• Built-In Web Pages - Allow unit to optionally be configured, controlled,

and monitored via access with a standard web browser over ethernet.• Convenient “Wink” ID Mode Support – Blinks green RUN LED in wink

mode as a tool to help identify specific remote units.• Fully Independent w/ Direct I/O Connection – Self-contained with no

special bus couplers, power supply, or rack mount required to operate.• Network Port is Transient Protected – Shielded RJ45 port includes

transient protection from ESD, EFT, and other transients.• 10Base-T and 100Base-TX Support – Per IEEE 802.3/802.3u.• Auto-Negotiated 10/100Mbps, Half or Full Duplex.• Plug-In Terminal Blocks & DIN-Rail Mount - Make mounting, removal,

and replacement easy.• Flexible Discrete Inputs & Outputs - High voltage/current open-drain

outputs provide direct (low-side) control of external devices. Bufferedinputs allow outputs to be read back, or input levels to be monitored.

• Tandem Input/Output Circuitry (983EN Only) - Input buffers areconnected in tandem with open-drain outputs for convenient loop-backmonitoring of the output state.

• Convenient Pullup Resistors Mounted In Sockets – SIP resistors areinstalled in sockets on the I/O board and provide input and output pull-ups to the excitation supply. These SIP resistors can be removed orexchanged according to your application.

• Outputs Have Built-in Protection – Over-temperature and over-currentshut-down protection is built-in and outputs include active clampingcircuitry for switching inductive loads.

• Failsafe Mode Support w/Watchdog Time Control – Outputs can besent to a failsafe state if the host fails and a watchdog timeout occurs.

• Nonvolatile Reprogrammable Memory – Allows the functionality of thisdevice to be reliably reprogrammed thousands of times.

• Operation/Diagnostic LED Indicators Aide Troubleshooting – 12yellow LED’s indicate active-low I/O state. Yellow ACT LED indicatesport activity (busy). Green LNK LED indicates link (auto-negotiationcomplete and connection established). Green RUN LED indicatespower or blinks in wink ID mode. Yellow ST LED indicates defaultcommunication mode (slow flash) and timeout status (fast flash).

• Internal Watchdog - A hardware watchdog timer is built into themicrocontroller that causes it to initiate a self reset if the controller ever“locks up” or fails to return from an operation in a timely manner.

• Wide-Range DC-Power – Wide range diode-coupled for use withredundant supplies, and/or battery back-up.

• Hardened For Harsh Environments - For protection from RFI, EMI,ESD, EFT, & surges. Has low radiated emissions per CE requirements.

• Wide Ambient Operation – Reliable over a wide temperature range.

KEY FEATURES



19

+5V

ON

PULLUPS

ON

100K OFF

RSTDEFA

STA

+3.3V

ACT

3.3V

LINK

+3.3V

6

3

I/OActiveLOW

EXC

TO OTHER3 CHAN OFPORT

5.6K

OFF

R(982EN)

CH

+3.3V

or R(981EN)(983EN)

CLK32K

5V

78

124 RJ45

RTN

15-36VDC

5

POWER

RUN

+3.3V+3.3V

+3.3V

DC-

GND

982EN/983ENOUTPUT BLOCK

OPEN-DRAIN OUTPUT

5.6K OHM SIP RESISTORINSTALLED IN SOCKET

I/OPOWERTOGGLE

SWITCH

RTC

MICRO-CONTROLLER

ISOLATEDFLYBACKSWITCHER

VRAM

DC+

SIMPLIFIED SCHEMATIC(1 CHANNEL OF 12)

I/O LOGICPOWER

Ethernet Port IncludesESD Protection

BUFFERED INPUT

ISOLATED ETHERNET

I/O STATUS LED

ISOLATED INPUT POWER

SRAM(512Kx8)

ETHERNETCONTROLLER

981EN/983EN INPUT BLOCK

983EN SIMPLIFIED SCHEMATIC

FLASH(512Kx8)

These digital I/O modules will interface with any mix of up to twelve digitalinput and/or output signals according to the model, and provide an isolated10/100Mbps Ethernet interface for configuration, monitoring, and control ofthe I/O. Outputs of these models are the open-drains of n-channel mosfets(982EN & 983EN). Input buffers are connected in tandem with the draincircuits via series 100KΩ resistors, and include over-voltage clamps to +5Vconnected at the buffer inputs (981EN & 983EN). The I/O terminals and theEthernet port terminals also include transient suppression. On boardsockets are included for installation of optional input or output drain pull-upresistors, and 5.6K SIP resistors are installed from the factory. Theseresistors are pulled up to an external supply connected to the EXC and RTNterminals. An internal microcontroller will switch outputs ON/OFF andsample the digital inputs. Embedded configuration parameters are stored innon-volatile memory integrated within the micro-controller. A dedicatedEthernet controller handles Ethernet communication. A wide input switchingregulator (isolated flyback) provides isolated power to the I/O circuit and theEthernet controller. Refer to the simplified schematic shown below to helpgain a better understanding of the circuit.

HOW IT WORKS



20

Checksum

TCP FRAME

MODBUS FRAME

Transaction Identifier Modbus FrameLength FieldProtocol Identifier

DataAddress Function Code

Modbus ChecksumNot Included

TCP/IP refers to Transmission Control Protocol and Internet Protocol.TCP/IP allows blocks of binary data to be exchanged between computers.TCP/IP is everywhere and is the foundation for the World Wide Web. Theprimary function of TCP is to ensure that all packets of data are receivedcorrectly, while IP makes sure that messages are correctly addressed androuted. Note that the TCP/IP combination does not define what the datameans or how the data is to be interpreted, it is merely a transport protocol.

Modbus is an application protocol. It defines rules for organizing andinterpreting data and is essentially a messaging structure that is independentof the underlying physical layer. It is freely available and accessible toanyone, easy to understand, and widely supported by many manufacturers.

Modbus TCP/IP uses TCP/IP and Ethernet to carry the data of the Modbusmessage structure between devices. That is, Modbus TCP/IP combines aphysical network (Ethernet), with a networking standard (TCP/IP), and astandard method of representing data (Modbus). A Modbus TCP/IPmessage is simply a Modbus communication encapsulated in an EthernetTCP/IP wrapper.

In practice, Modbus TCP embeds a Modbus data frame into a TCP frame,sans the Modbus checksum, as shown in the following diagram. TheModbus checksum is not used, as the standard ethernet TCP/IP link layerchecksum methods are instead used to guaranty data integrity.

Note that the Modbus address field is referred to as the Unit Identifier inModbus TCP. In a typical slave application, the Unit ID is ignored and justechoed back in the response.

The operation of the 981/982/983EN industrial Ethernet modules is verysimilar to Acromag’s 901/902/903MB ModBus modules. The operation overEthernet is essentially transparent to the Modbus register/commandstructure. If you are already familiar with Modbus or with Acromag Series900MB modules, then you are already familiar with the operation of the981/982/983EN modules.

A host is any device on any network. On TCP/IP networks, each host hasone or more unique IP addresses. This module connected to an ethernetnetwork is a host.

An IP Address is a unique identification number for any host (this module) onany TCP/IP network (including the internet). The IP address is made up offour octets (8 bits), each octet having a value between 0-255 (00H-FFH).The IP address is comprised of two parts: the network address (first part)and the host address (last part). The number of octets of the four total thatbelong to the network address depend on the Class definition (see below).

ABOUT MODBUSTCP/IP

IP Addressing



21A Static IP Address is as the name implies—static. That is, it is a unique IPAddress that is assigned by a service provider and never changes.

A Dynamic IP Address is an address that is temporarily assigned to a userby a service provider each time a user connects.

A Subnet is a contiguous string of IP addresses. The first IP address in asubnet is used to identify the subnet, while the last IP address in a subnet isalways used as a broadcast address. Anything sent to the last IP address ofa subnet is sent to every host on the subnet.

Subnets are further broken down into three size classes based on the 4octets that make up the IP address. A Class A subnet is any subnet thatshares the first octet of the IP address. The remaining 3 octets of a Class Asubnet will define up to 16,777,214 possible IP addresses (224 – 2). A ClassB subnet shares the first two octets of an IP address (providing 216 – 2, or65534 possible IP addresses). Class C subnets share the first 3 octets of anIP address, giving 254 possible IP addresses. Recall that the first and lastIP addresses are always used as a network number and broadcast addressrespectively, and this is why we subtract 2 from the total possible uniqueaddresses that are defined via the remaining octet(s).

For our example, the default IP address of this module is 128.1.1.100. If weassume that this is a Class C network address (based on the default ClassC subnet mask of 255.255.255.0), then the first three numbers represent thisClass C network at address 128.1.1.0, the last number identifies a uniquehost/node on this network (node 100) at address 128.1.1.100.

A Subnet Mask is used to determine which subnet an IP address belongs to.The use of a subnet mask allows the network administrator to further dividethe host part of this address into two or more subnets. The subnet maskflags the network address portion of the IP address, plus the bits of the hostpart that are used for identifying the sub-network. By convention, the bits ofthe mask that correspond to the sub-network address are all set to 1’s (itwould also work if the bits were set exactly as in the network address). It’scalled a mask because it can be used to identify the unique subnet to whichan IP address belongs to by performing a bitwise AND operation betweenthe mask itself, and the IP address, with the result being the subnetworkaddress, and the remaining bits the host or node address.

For our Example, if we wish to further divide this network into 14 subnets,then the first 4 bits of the host address will be required to identify thesubnetwork (0110), then we would use “11111111.11111111.11111111.11110000” as our subnet mask. This would effectively subdivide our ClassC network into 14 subnetworks of up to 14 possible nodes each.

With respect to the default settings of this module:Subnet Mask 255.255.255.0 (11111111.11111111.11111111.00000000)IP Address: 128.1.1.100 (10000000.00000001.00000001.01100100)Subnet Address: 128.1.1.0 (1000000.00000001.00000001.00000000)

The subnetwork address of 128.1.1.0 has 254 possible unique nodeaddresses (we are using node 100 of 254 possible). Nodes 0, 10, and 255are typically reserved for servers and may yield poor results if used.

IP Addressing

TIP: The first node (0), node10, and the last node (255 forour example) are typicallyreserved for servers and mayyield poor results if used.



22DHCP refers to Dynamic Host Configuration Protocol and is a method usedto assign temporary numeric IP addresses as required. A DHCP servermaintains a pool of shared IP addresses which are dynamically assignedand recycled. When a DHCP device wants to use a TCP/IP application, itmust request an IP address from the DHCP server. The DHCP server willcheck the shared supply, and if all addresses are in use, the server will senda busy signal to the client which tells it to try again later. Static IP addresseswill ensure a connection every time, but dynamic addresses do not.

DNS refers to the Domain Name System or Domain Name Server and refersto the system used to associate an alphanumeric character string with anumeric IP address. The DNS is actually a distributed database of domainnames and corresponding IP addresses. These servers contain informationon some segment of the domain name space and make this informationavailable to clients called resolvers. For example, the DNS allows us to use“Acromag.com” as an IP address rather than a complicated number string.

Modbus registers are organized into reference types identified by the leadingnumber of the reference address:

Reference Description0xxxx Read/Write Discrete Outputs or Coils. A 0x reference

address is used to drive output data to a digital outputchannel.

1xxxx Read Discrete Inputs. The ON/OFF status of a 1xreference address is controlled by the correspondingdigital input channel.

3xxxx Read Input Registers. A 3x reference register contains a16-bit number received from an external source—e.g. ananalog signal.

4xxxx Read/Write Output or Holding Registers. A 4x register isused to store 16-bits of numerical data (binary or decimal),or to send the data from the CPU to an output channel.

Note: The ON/OFF state of discrete inputs and outputs is represented by a1 or 0 value assigned to an individual bit in a 16-bit data word. This issixteen 0x or 1x references per data word. With respect to mapping,the LSB of the word maps to the lowest numbered channel of a groupand channel numbers increase sequentially as you move towards theMSB. Unused bit positions are set to zero.

All I/O values are accessed via the 16-bit Input Registers or 16-bit HoldingRegisters given in the Register Map. Input registers contain information thatis read-only. For example, the current input value read from a channel, orthe states of a group of digital inputs. Holding registers contain read/writeinformation that may be configuration data or output data. For example, thehigh limit value of an alarm function operating at an input, or an output valuefor an output channel.

Each module has a default factory configuration as noted in theSPECIFICATIONS section. Your application will likely differ from the defaultconfiguration and the module will need to be reconfigured. You mayreconfigure this module by issuing the appropriate Modbus functions toRegister Map registers, as required by your application. You may also use astandard web browser to access the built-in web pages of the module toperform basic operations.

Dynamic HostConfiguration Protocol(DHCP)

Domain Name System(DNS)

MODBUSREGISTERS

The “x” following the leadingcharacter represents a four-digit address location in userdata memory.

The leading character isgenerally implied by thefunction code and omitted fromthe address specifier for agiven function. The leadingcharacter also identifies theI/O data type.

Register Functions



23Below is a subset of standard Modbus functions that are supported by thismodule along with the reference register address group that the functionoperates on. Use these functions to access these registers as outlined inthe Register Map for sending and retrieving data.

The following Modbus functions operate on register map registers tomonitor, configure, and control module I/O:

CODE FUNCTION REFERENCE01 (01H) Read Coil (Output) Status 0xxxx02 (02H) Read Input Status 1xxxx03 (03H) Read Holding Registers 4xxxx04 (04H) Read Input Registers 3xxxx05 (05H) Force Single Coil (Output) 0xxxx06 (06H) Preset Single Register 4xxxx15 (0FH) Force Multiple Coils (Outputs) 0xxxx16 (10H) Preset Multiple Registers 4xxxx17 (11H) Report Slave ID (See Below) Hidden

If an unsupported function code is sent to a module, exception code 01(Illegal Function) will be returned in the response. If a holding register iswritten with an invalid value, exception code 03 (Illegal Data Value) will bereturned in the response message. You may refer to the Modbusspecification for a complete list of possible error codes.

983EN-4012 Report Slave ID Example ResponseFIELD DESCRIPTIONUnit ID Echo Unit ID Sent In QueryFunction Code 11Byte Count 30Slave ID (Model No.) 0C=981EN-4012 (12DI)

0D=982EN-4012 (12DO)0E=983EN-4012 (12 DI/O)

Run Indicator Status FFH (ON)Firmware NumberString (AdditionalData Field)

41 43 52 4F 4D 41 47 2C 39 33 30 30 2D31 33 32 2C 39 38 33 45 4E 2D 34 30 31 32 2C30 31 32 33 34 35 41 2C 30 31 32 33 34 35(“ACROMAG,9300-132,983EN-4012,serialnumber&rev,six-byteMACID”)

For detailed information on Modbus, feel free to download our technicalreference “Introduction To Modbus” at www.acromag.com.

For your convenience, this module mirrors the contents/operation ofregisters 0xxxx, 1xxxx, & 3xxxx (as applicable) into holding register spacefor systems and controllers that cannot directly access registers 0xxxx,1xxxx, & 3xxxx.

All Modbus registers of this model can now be written to, or read from, usingeither the standard methods described in the Modbus specification, orthrough mapping (mirroring) to the Holding Registers. The registers aremapped as follows and specifics follow the mapping:

Register Functions

IMPORTANT: When usingyour own software tomanipulate the module, pleasenote that the maximum querythrough the Modbus TCPinterface is only 50 registers,due to the maximum buffersize limitations of the TCP/IPstack. As such, you can onlyrequest data from 50 registersat one time for commands thataccess multiple registers. Forexample, the Read HoldingRegisters command may onlyretrieve the contents ofregisters 40001 to 40051 inone read.

Register Mirroring



240xxxx Coil Registers are mapped to 42xxx Holding Registers1xxxx Input Status Registers are mapped to 41xxx Holding Registers3xxxx Input Registers are mapped to 43xxx Holding Registers

For 3xxxx Input Registers, the format of the registers are identical and youonly need to offset your address by 43000. For example: if you want to readInput Register 1 through the Holding Registers, you would use the “ReadHolding Registers” function with an address of 43001.

For the 1xxxx Input Status Registers, the return data is reformatted to matchthe Holding Register format. For example: if you request the Input Status for12 digital inputs, instead of getting 2 bytes returned with the first 12 bitsrepresenting the 12 digital inputs, you will get 12 separate words, each set toeither 0000H (OFF), or FFFFH (ON).

For the 0xxxx Coil Registers, reads are handled in the same way as the1xxxx Input Status Registers. You can also write to the coil registers byusing the “Preset Single Register” function with an address offset of 42000.Setting the data to 0000H will turn the coil OFF, while setting the data toFF00H will turn the coil ON. Writing to multiple coils is not supported viaregister mirroring, you must use the “Write Multple Coils” function for that.

Note that with respect to the Acromag 9xxMB Modbus RTU modules, onlythe 3xxxx Input Registers are mirrored into 4xxxx space, not Coil or InputStatus registers as noted here for 9xxEN models.

I/O values for Series 900EN modules are represented by the followingsimple data types for temperature, percentage, and discrete on/off.

Summary Of Data Types Used By 900MB/900EN ModulesData Types DescriptionCount Value A 16-bit signed integer in range of -32768 to +32767, or

unsigned integer in range of 0 to 65535, representing anA/D or DAC count, time value, or frequency.

Percentage A 16-bit signed integer value in range of -32768 to+32767. ±20000 is used to represent ±100%, yielding aresolution of 0.005%/lsb. For example, -100%, 0% and+100% are represented by decimal values –20000, 0,and 20000, respectively. The full range is –163.84%(-32768 decimal) to +163.835% (+32767 decimal).

Temperature A 16-bit signed integer value with resolution of 0.1°C/lsb.For example, a value of 12059 is equivalent to 1205.9°C,a value of –187 equals –18.7°C. The maximum possibletemperature range is –3276.8°C to +3276.7°C.

Discrete(This Model)

A discrete value is generally indicated by a single bit of a16-bit word. The bit number/position typicallycorresponds to the discrete channel number for thismodel. Unless otherwise defined for outputs, a 1 bitmeans the corresponding output is closed or ON, a 0 bitmeans the output is open or OFF. For inputs, a value of1 means the input is ON (Active low near 0V), while avalue of 0 specifies the input is OFF or in its high state(usually >> 0V).

Register Mirroring

Data Types



25The following table outlines the register map for the Model 983EN-4012network I/O module. The same register map is used for sub-models 981EN-4012 and 982EN-4012 and some registers will not apply to the sub-models.The Modbus functions operate on these registers using the data types notedabove (except for the Reset Slave and Report Slave ID functions).

Note that this register map is very similar to the register map of Acromag901/902/903MB ModBus modules, except that registers for slave address,baud rate, parity, turnaround delay, and reset have been removed.

Unless otherwise noted, Holding Register values are maintained in non-volatile flash memory.

Ref Addr. Description Data Type/FormatCoil Registers (0x References, Read/Write)00001Thru

00012

0-11(0000-000B)

12 DiscreteOutputs 0-11(983EN &982EN Only)

Discrete Output Value. Addresses aspecific bit of a 16-bit word thatcontrols/monitors the ON/OFF status forthe output (the gate signal of the n-channel mosfet). 0=OFF; 1=ON.

Note: This signal correspondsto the gate signal of the n-channel output mosfet. Thus, aread of this register may notreflect the actual output level atthe drain of the mosfet if theopen-drain is not pulled up or isleft floating. Excitation must beprovided in order to operate theoutputs. On 983EN units, youcan read the Contact Registersto obtain the actual outputstate(s) via closed loopfeedback.

The bit position also corresponds to theoutput channel number (i.e. output 0uses bit 0 of the 16-bit word at address0, output 1 uses bit 1 of the 16-bit wordat address 1, etc.) Unused bits are setto 0. A set bit (1) means the output isturned ON (sinking current). A clear bit(0) means output is turned OFF (open).Bits 15-12: Not Used. Additionally,unused bits in range 11-0 are set to 0.After reset, these registers read 0(outputs OFF) and these registers arenot maintained in EEPROM.

Contact Registers/Input Status (1x References, Read-Only)10001Thru

10012

0-11(0000-000B)

12 DiscreteInputs 0-11(983EN &981EN Only)

Discrete Input Value. Addresses aspecific bit of a 16-bit word thatmonitors the ON/OFF status for theinput or tandem output. 0=OFF; 1=ON.

Note: This signal reflects theactual state of thecorresponding input signal(981EN & 983EN), or the drainof the tandem output (983EN).This signal is active-low.

Failure to install I/O pullups orprovide port excitation will leaveinputs floating.

The bit position corresponds to the inputchannel number (i.e. input 0 uses bit 0of the 16-bit word at address 0, input 1uses bit 1 of the 16-bit word at address1, etc.) Unused bits of a word are set to0. A set bit (1) means the input is ON(active-low). A clear bit (0) means theinput is OFF (high).Bits 15-12: 0/Not Used. Additionally,unused bits in range 11-0 are set to 0.

Register MapModel 983EN-4012



26Ref Addr. Description Data Type/Format

Input Registers (3x References, Read-Only)30001 0000 Module

StatusBit 15: 0 (Not Used)Bit 14: Wink Mode Flag1 = Wink Mode (Blinks Run LED for ID)0 = Normal Operation(See Wink Module Register)Bit 13: Default Mode Flag1 = Default Mode Indicator0 = Not Default ModeBits 12-3: 0 (Not Used)Bit 2: Port 2 (CH 8-11)1 = Port 2 Watchdog FaultBit 1: Port 1 (CH 4-7)1 = Port 1 Watchdog FaultBit 0: Port 0 (CH 0-3)1 = Port 0 Watchdog Fault

Holding Registers (4x References, Read/Write)40001 0

(0000)Port 0(CH0-3)WatchdogTimeDefault=0,Disabled

Can be set from 1 to 65534 seconds.

Set to 65535 (FFFFH) or 0 (0000H) todisable the watchdog timer.

40002 1(0001)

Port 1(CH 4-7)WatchdogTimeDefault=0,Disabled



40003 2(0002)

Port 2(CH 8-11)WatchdogTimeDefault=0,Disabled



40004 3(0003)

Port 0(CH 0-3)TimeoutState(982EN and983EN Only)

Default=65535,Disabled.

The four lower order bits of this 16-bitregister value define the state the outputchannels of the port will be programmedto following a watchdog timeout. Bit 0corresponds to channel 0, bit 1 tochannel 1, bit 2 to channel 2, and bit 3to channel 3. Write 65535 (FFFFH) tothis register to leave the outputsunchanged following a timeout (this isalso the default value).


Note: Changes to HoldingRegisters take effectimmediately.

Note: A port timeout can onlybe cleared via a read or writeto any channel of the sameport, or upon a software orpower-on reset of the module.



27Ref Addr. Description Data Type/Format

Holding Registers (4x References, Read/Write)40005 4

(0004)Port 1(CH 4-7)TimeoutState(982EN and983EN Only)



40006 5(0005)

Port 2(CH 8-11)TimeoutState(982EN and983EN Only)



40007 6(0006)

Wink ModuleToggleRegister

Write 21845 (5555H) to this register tocause the module to “wink” its greenRun LED in order to ID the module.Write the same value a second time tostop “winking”. This register will alwaysread back as 0000H. Use the ModuleStatus Register wink mode flag (bit 14)to determine the wink state.

41001...

This blockMirrors 1xxxxRegisters.

Refer to Register Mirroring. 1xxxxInput Status Registers are mapped tothe 41xxx Holding Register space usingan address offset of 41000.

42001...


Refer to Register Mirroring. 0xxxxCoil Registers are mapped to the 42xxxHolding Register space using anaddress offset of 42000.

43001...


Refer to Register Mirroring. 3xxxxInput Registers are mapped to the43xxx Holding Register space using anaddress offset of 43000.


Note: Clearing a timeout viaan I/O read or write does notreturn the output(s) to theirinitial state. They remain intheir timeout states untilotherwise written.

Configuration variables storedin holding registers (4xxxxreference addresses) aremaintained in EEPROM exceptas noted.



28These DIN-rail mount, industrial ethernet, digital I/O modules include twelvedigital inputs (981EN), twelve digital outputs (982EN), or twelve combinationdigital input/output channels (983EN), and provide an isolated 10/100BaseTEthernet port for monitoring and control. Units are DC-powered and includereverse polarity protection. Outputs are open-drain, low-side switches, whileinputs are active-low. Channel I/O, network, and power circuits are isolated.Outputs have high voltage/current capacity for discrete on/off control ofexternal devices. Non-inverting, buffered inputs provide support for digitallevel sensing, or for simply reading back the tandem output (983EN only).I/O channels share common. Pull-up resistors to the port EXC supply (everyfour channels) are installed in sockets on the board. Non-volatilereprogrammable memory in the module stores configuration information.

The BusWorks model prefix “900” denotes the Series 900 network I/Ofamily. The “EN” suffix denotes EtherNet. Select 981EN for digital inputs,982EN for digital outputs, or 983EN for tandem digital inputs and outputs.The four digit suffix of this model number represents the following options,respectively: “4” = Ethernet; “0” = Default; “12” = 12 Channels.

Twelve active-low, buffered inputs, with a common connection (RTN). ForDC voltage applications only. Inputs include transient suppression and haveseries connected 100KΩ resistors, plus diode over-voltage clamps to theinternal +5V supply. Sockets are provided at each port (group of fourchannels) for installation of SIP resistor networks that serve as pullups to theport EXC supply terminal. 5.6K pull-up resistor SIP’s are installed from thefactory. External excitation (pull-up supply) is required for proper operationand is connected between the port EXC and RTN terminals.

Input Signal Voltage Range: 0 to +35VDC.Input Current: 293uA, typical at 35VDC. This is computed as the applied

input voltage minus 5.7V, divided by the series 100KΩ input resistance.Input Signal Threshold: TTL compatible with 100mV of hysteresis, typical.

Low-to-High threshold is 1.7VDC typical, High-to-Low threshold is1.6VDC, typical. Limit logic transition to TTL levels of 0.8VDC (MaxLOW level) and 2.0VDC (Min HIGH level).

Input Resistance: 100KΩ, typical.Input Hysteresis: 100mVDC typical.Input Response Time: 800ns typical, measured from input step to logic

transfer. Actual input response will vary with interrupts.

Twelve open-drain, DMOS mosfet switches with a common sourceconnection at the port RTN terminal. For DC voltage and current-sinkingapplications only. Outputs have built-in transient protection. Sockets areprovided at each port (four channels) for quick replacement and installationof SIP resistor networks that serve as pullups to the port EXC supplyterminal. 5.6K pull-up resistor SIP’s are installed from the factory.

Output “OFF” Voltage Range: 0 to 35V DC. Limit voltage to 35V or lessor damage to the unit may result.

Output “OFF” Leakage Current: : 0.1uA typical, 50uA maximum (mosfetonly, 25°C, 35V). Does not include the tandem input bias current of983EN models (see below).

SPECIFICATIONS

Model Numbers981EN-4012 (Input Only)982EN-4012 (Output Only)983EN-4012 (Input/Output)

Digital Inputs(981EN & 983EN Only)




29Note (983EN): The 100KΩ series input buffer resistors in combinationwith the +5V voltage clamps at the input buffers will tend to increase theoff-state drain current with increased drain voltage (up to 0.3mA at35V). This is due to the fact that the input buffer circuitry and outputmosfet drain circuitry are connected in tandem to the same I/O pin forthe Model 983EN.

Output “ON” Current Range: 0 to 500mA DC, continuous (up to 6A totalfor all 12 channels combined). No deration required at elevatedambients. Group one RTN per each group of 4 outputs.

Output Rds ON Resistance: 0.13Ω typical, 0.28Ω Maximum.Output Response Time: 220us typical measured from output trigger at the

controller to corresponding input transition at the controller. Actualswitch time will vary with output load and interrupts.Note: Per UL, when the outputs are used to control interposing relaysfor switching AC and DC devices of higher voltage/current, the coilratings for the interposing relay shall not exceed 24VDC, 100mA.

I/O Pullups & Socket: I/O channels include sockets for installation of SIPresistor networks to act as pull-ups for the channel (see I/O PullupResistor Installation drawing of page 4). These resistors are located onthe plug-in I/O board (cover removal required). A SIP socket isincluded for each group of four channels (port) and a 5.6KΩ resistorSIP is installed from the factory. The even-numbered pins of thesesockets (common leads) connect to the port EXC+ terminal. Anexternal excitation supply is typically connected between the EXC+ andRTN terminals of the port. The recommended SIP resistor is a fourisolated resistor type (8 pins) and may be obtained from Acromag oranother vendor. These SIP resistors typically come rated for 0.2W,0.3W, 0.4W, or 0.5W per element. For example, refer to Bourns4308R-102, 4308M-102, or 4308H-102 parts. You may also refer toDale CSC08C03, MSP08C03, or MSM08C-03 parts. The 5.6KΩ SIPprovided is a high-power type from Bourns (part number 4308H-102-562) and is rated at 0.5W per resistor up to 70°C. See I/O PullupResistor Installation section for more information.IMPORTANT: When selecting a SIP resistor, be sure to limit theindividual resistor power dissipation to less than the rated power perelement. Further, do not exceed 500mA of drain current per output, or2A total per RTN terminal.

Excitation (External): External voltage is applied between the port EXCand RTN terminals and must be limited to 35V or less. The EXCterminal is tied to the even-numbered pins of the resistor SIP socketprovided for each port or group of 4 channels.

Dimensions: 1.05 inches wide, 4.68 inches tall, 4.35 inches deep. Refer tothe dimensions drawing at the front of this manual.

DIN Rail Mount: Type EN50022; “T” rail (35mm).I/O Connectors: Removable plug-in type terminal blocks rated for

15A/300V; AWG #12-24 stranded or solid copper wire.Network Connector: 8-pin RJ-45 connector socket with metal shield

(shield is isolated and bypassed to earth ground at the GND terminalwith an isolation TVS and capacitor). Connections are wired MDI, asopposed to MDI-X. You must use a CAT-5 crossover cable to connectthis module to a PC. Otherwise you may use an auto-crossing Ethernetswitch, such as the Acromag 900EN-S005 to make connections.


To control higher voltagesand/or currents, or forcontrolling AC, an interposingrelay may be used (see Note).

General Specifications


Enclosure and Physical



30RJ-45 Signal (MDI) Description

1 Tx+ Transmit Positive2 Tx- Transmit Negative3 Rx+ Receive Positive4 Not Used Connects to Pin 55 Not Used Connects to Pin 46 Rx- Receive Negative7 Not Used Connects to Pin 88 Not Used Connects to Pin 7

Case Material: Self-extinguishing NYLON type 6.6 polyamide thermoplasticUL94 V-2, color beige; general purpose NEMA Type 1 enclosure.

Printed Circuit Boards: Military grade FR-4 epoxy glass.Shipping Weight: 1 pound (0.45 Kg) packed.

Safety Approvals: CE marked (EMC Directive 89/336/EEC), UL Listed(UL3121-First Edition, UL1604), cUL Listed (Canada Standard C22.2,No. 1010.1-92), Hazardous Locations: Class 1; Division 2; Groups A, B,C, D.

Operating Temperature: -25°C to +70°C (-13°F to +158°F).Storage Temperature: -40°C to +85°C (-40°F to +185°F).Relative Humidity: 5 to 95%, non-condensing.Power Requirements: Non-polarized 15-36V DC SELV (Safety Extra Low

Voltage). Observe proper polarity. See table for current.

Supply 981/982/983EN-4012 Current Draw15V 112mA Typical, 123mA Maximum18V 96mA Typical, 106mA Maximum24V 73mA Typical, 80mA Maximum36V 54mA Typical, 59mA Maximum

CAUTION: Risk of Electric Shock – More than one disconnect switch maybe required to de-energize equipment before servicing.

Isolation: I/O channel, power, and network circuits are isolated from eachother for common-mode voltages up to 250VAC, or 354V DC off DCpower ground, on a continuous basis (will withstand 1500VAC dielectricstrength test for one minute without breakdown). Complies with testrequirements of ANSI/ISA-82.01-1988 for voltage rating specified.

Installation Category: Designed to operate in an installation in a PollutionDegree 2 environment with an installation category (over-voltagecategory) II rating.

Electromagnetic Interference Immunity (EMI): Inputs/outputs havedemonstrated resistance to inadvertent state changes with interferencefrom switching solenoids, commutator motors, and drill motors.

Electromagnetic Compatibility (EMC) -Minimum Immunity Per European Norm EN50082-1:

Electrostatic Discharge (ESD) Immunity: 4KV direct contact and 8KVair-discharge to the enclosure port per EN61000-4-2.

Radiated Field Immunity (RFI): 10V/M, 80 to 1000MHz AM and900MHz keyed carrier, per EN61000-4-3 and ENV50204.

Electrical Fast Transient Immunity (EFT): 2KV to power, and 1KV tosignal I/O per EN61000-4-4.

Enclosure & Physical

Agency Approvals

Environmental

CAUTION: Do not exceed36VDC peak, to avoid damageto the module.

CAUTION: Risk of ElectricShock – More than onedisconnect switch may berequired to de-energize theequipment before servicing.

External Fuse: Select a highsurge tolerant fuse rated for1A or less to protect unit.

Note that I/O channels are notisolated channel-to-channel.

These limits represent theminimum requirements of thestandard, but product hastypically been tested to complywith higher standards in somecases.



31Conducted RF Immunity (CRFI): 10V rms, 150KHz to 80MHz, per

EN61000-4-6.Surge Immunity: 0.5KV per EN61000-4-5.

Emissions Per European Norm EN50081-1:Radiated Frequency Emissions: 30 to 1000MHz per EN55022 Class AWARNING: This is a Class A product. In a domestic environment, this

product may cause radio interference in which the user may berequired to take adequate measures.

IMPORTANT: Power, input, and output (I/O) wiring must be in accordancewith Class I, Division 2 wiring methods of Article 501-4(b) of the NationalElectrical Code, NFPA 70 for installations in the US, or as specified insection 18-1J2 of the Canadian Electrical Code for installations withinCanada and in accordance with the authority having jurisdiction.

This equipment is suitable for use in Class I, Division 2, Groups A, B,C, and D, or non-hazardous locations only.

WARNING – EXPLOSION HAZARD – Substitution of components mayimpair suitability for Class I, Division 2.

WARNING – EXPLOSION HAZARD – Do not disconnect equipment unlesspower has been switched off or the area is known to be non-hazardous.

Connector: Shielded RJ-45 socket, 8-pin, 10BaseT/100BaseTX.Wiring: Wired MDI. Unit does NOT support auto-crossover.Protocol: Modbus TCP/IP w/Web Browser Configuration.IP Address: Default mode static IP address is 128.1.1.100.Port: Up to 10 sockets supported, uses port 502 (reserved for Modbus).Transient Protection: Transient Voltage Suppressors are applied

differentially at both the transmit and receive channels. The metalshield is capacitively coupled to earth ground terminal via an isolationTVS and capacitor.

Data Rate: Auto-sensed, 10Mbps or 100Mbps.Duplex: Auto-negotiated, Full or Half Duplex.Compliance: IEEE 802.3, 802.3u, 802.3x.Modbus TCP/IP Protocol Support: Uses built-in web pages for

configuration and control over ethernet via a standard web browser. Upto 10 sockets may be selected. The module uses the standard ModbusTCP/IP socket 502.

Rx/Tx Memory: 8K bytes internal SRAM memory for receive and transmitbuffers (FIFO).

Communication Distance: The distance between two devices on anEthernet network is generally limited to 100 meters using recommendedcopper cable. Distances may be extended using hubs, switches, orfiber optic transmission. However, the total round trip delay time mustnot exceed 512 bit times for collision detection to work properly.

Port Status Indicators: Green LED indicates link status (ON if auto-negotiation has successfully established a connection), yellow LEDindicates activity (ethernet connection is busy/traffic is present).

Environmental

Ethernet Interface



32Address: The module IP address can be preset by the user (static) and

loaded from internal non-volatile memory, or it can be automaticallyacquired at startup via a network server using a BOOTP (BootstrapProtocol), or DHCP (Dynamic Host Configuration Protocol). The unitalso includes a default mode toggle switch to cause the module toassume a “known” fixed static IP address of 128.1.1.100 fortroubleshooting purposes.

LED Indicators:RUN (Green) - Constant ON if power is on and unit is OK. Continuous

flashing ON/OFF indicates unit is in “wink” ID mode.ST (Yellow) – Slowly blinks ON/OFF in default mode, blinks rapidly if a

watchdog timeout has occurred.LINK (Green) – Indicates Ethernet link status (ON if auto-negotiation has

successfully established a connection).ACT (Yellow) – Indicates Ethernet activity (Ethernet connection is

busy/traffic is present).Output (Yellow, One Per Output) – ON if output relay is ON (closed) or

input is asserted low. Note: This LED is driven by the input buffer of981/983EN units and will reflect the actual input state. On 982ENunits (output only), this LED is driven by the output mosfet gate signaland may not reflect the actual open-drain output state (for example, ifthe outputs are floating or not pulled up).

Controls:Reset/Default Address Switch: This momentary toggle switch is

located on the front panel and is used to either reset the module(toggle right), or toggle the module into, or out of DefaultCommunication Mode (toggle left). In Default Mode, the moduleassumes the fixed static IP address “128.1.1.100”, a default subnetmask “255.255.255.0”, a default username of “User”, and a defaultpassword of “password00”. This switch can also be used to restorethe module to its initial factory configuration by holding this switch inits default position while powering up the unit (see “Getting Out OfTrouble” in the Troubleshooting section for more information).

The minimum cable required for full operation of this device is Category 5.The term “Category” refers to classifications of UTP (Unshielded TwistedPair) cables. There are 3 main categories of cable – Category 3, Category4, and Category 5. The differences in classification is found in their electricalperformance and this is documented in the TIA/EIA 568A standard.Category 5 cable includes four twisted wire pairs at eight twists per foot.

This device is designed for use in harsh industrial environments. Acromagrecommends the use of shielded cable when wiring to this device. SelectSTP (Shielded Twisted Pair) cable rather than UTP (Unshielded TwistedPair). The use of shielded cable will help protect the data being transmittedfrom harmful EMI (Electromagnetic Interference) and RFI (Radio FrequencyInterference). It will also help to lower your radiated emissions by keepingthe cable from emitting EMI and RFI.

There are two types of cable: solid cable and stranded cable. Strandedcables are more flexible than solid cables. But since attenuation is higher forstranded cables than solid conductor cables, these are generally reservedfor short runs and patch applications less than 6 meters.

Refer to Acromag ApplicationNote 8500-734 for instructionson how to change the IPaddress of your PC networkinterface card in order to talkto an Acromag module.

Controls & Indicators

ACCESSORYCABLES



33Currently there are two types of shielding employed in Category 5 STPcable: single-shielded cable and double-shielded cable. Both of thesecables have the same core and jacket as UTP cables, but also include a thinfoil outer shield that covers all four twisted-wire pairs. Some variations willalso include a drain wire that encircles the outer foil. The double-shieldedversion adds an outer wire screen that wraps around the foil shield and alsofunctions as a drain wire. The drain wire or wire screen typically makescontact at each end of the cable with the metal shield around special RJ45plug connectors. The metal shield of these connectors then makes contactwith the metal shield of shielded RJ45 sockets. The socket shield maymake direct contact with earth ground, or it may be capacitively coupled toearth ground. In the Acromag 9xxEN modules, this shield contacts earthground via a high voltage capacitor and transient voltage suppressor. Inaddition to minimizing radio frequency and electromagnetic interference, thisarrangement also has the added benefit of enhanced protection from ESD(Electro-Static Discharge).

Further, Acromag recommends the use of enhanced Category 5 cable(CAT-5e). This cable has all the characteristics of Category 5, but includesenhancements that help to minimize crosstalk. It is rated for frequencies upto 200MHz, double the rate of Category 5. Category 5e cable also has agreater number of turns-per-inch in its twisted pairs, making its performancemore suitable for applications that make use of all four wire pairs forsimultaneous bidirectional data transmission (full-duplex). This cable isdefined in TIA/EIA-568A-5 (Addendum 5).

Acromag offers the following cable accessories for use with this module:

Cable Model 5035-355 – A yellow, 3 foot long, single-shielded Category 5eSTP patch cable with drain wire and an RJ45 plug at both ends. Use thiscable to connect an Acromag 9xxEN I/O module to the Acromag 900EN-S005 switch.Cable Model 5035-360 – A green, 5 foot long, single-shielded Category 5eSTP crossover cable with a drain wire and an RJ45 plug at both ends. Thiscable performs the Ethernet crossover function and is used to connect a PCdirectly to an Acromag Series 9xxEN I/O module.

Note that you do not need to use a crossover cable to connect your PC tothis module if the Acromag 900EN-S005 switch is used between the PC andmodule, as the switch is auto-crossing. However, you must use a crossovercable when directly connecting your PC to a Series 9xxEN I/O Modulewithout the use of an auto-crossing switch or hub.

ACCESSORYCABLES

Patch Cable &Crossover Cable



34You may obtain cable in other lengths and colors as required for yourapplication from other vendors. For example, shielded CAT-5e cable isavailable from the following vendors:

• L-com Connectivity Products, www.L-com.com• Pro-Link, www.prolink-cables.com

For very noisy environments or in the presence of strong electrical fields, youcan obtain double-shielded CAT-5e cable and shielded RJ45 plugs from thefollowing vendors:

• L-com Connectivity Products, www.L-com.com, see cable modelTFSC2004 and shielded plug T8P8CSR.

• Regal Electronics, www.regalusa.com, see shielded plug model1003B-8P8CSR-C5.

Complete premium double-shielded Category 5e standard and crossovercables in variable lengths can be obtained from Lumberg atwww.lumbergusa.com (refer to their etherMate line). For example, specifyRJ45S-RJ45S-656/B/3M for a double-shielded, 3 meter straight cable.Specify RJ45S-RJ45S-656/BX/3M for a double-shielded, 3 meter crossovercable.

Patch Cable &Crossover Cable

Documents

BusWorks 900EN Series - Modbus TCP/IP 10/100 Industrial ... · 0 1 act 23 st tb1 ch 1 ch10 rtn exc3 exc2 ch 6 gnd tb3 link 10 tb1 11 46 12 14 15 45 43 42 22 2523 32 26 31 exc1 rtn