fluid sensorsand diagnostic

systems

bus,identification

and control systems

positionsensors

and objectrecognitionw

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IO-Link –point-to-point

communication.

The point-to-point interfacefor sensors and actuators.

visualisation

communi-

cation

controller

decentralised controller

input/output

process

supervisory

level

production

control level

LAN, WAN,

Ethernet TCP/IP,

XML

ControlNet, Ethernet/IP, H1,

Profibus FMS, Profibus CBA

Devicenet, Interbus,

CANopen, Profibus DP,

Profinet IO, CC-Link

AS-interface

field level

IO-Link

binary, analogue

(4...20 mA)

parameter /

diagnostic data

Use also for older installa-tions, downward-compa-tible by using the standardsensor signal.

Easy replacement of theIO-Link units without addi-tional software changes oroperating panels, reductionof the set-up times.

Only one manufacturerand fieldbus independentsystem that will replace allproprietary systems in themedium term.

Additional diagnostic infor-mation can be requestedif needed, meaning easierfault location and so re-duced downtime.

Central diagnosis of thecomplete plant, e.g. via theFDT software.

Restoring the sensor / actu-ator parameters in case ofreplacement and servicing.

Interface for the last metre

IO-link is a point-to-point inter-face for the connection of anysensors and actuators to a controlsystem. As opposed to conven-tional fieldbus systems this is nota bus wiring system but parallelwiring, for the “last metre” tothe sensor. IO-Link is suitable forbinary and analogue sensors andactuators.

The difference between IO-Linksensors and standard sensors liesin the combination of the stan-dard output channel with anadditional data channel.

So all existing connection cablescan also be used for IO-Link units.

Communication

IO-Link sensors command threetypes of communication:

• switching status (binary, likeconventional sensors)

• cyclical process data(e.g. digital transmission ofmeasured values)

• transfer of device parametersand diagnostic data

Any combination of the threevariants is possible.

So an optical distance sensor,for example, is first supplied withparameter data and in theprocess then only transmits a

switching signal when detectingan object in the defined zone.As an option, the sensor can alsotransmit an analogue signal,which is proportional to the dis-tance.

Connection

Two procedures are possibleto transfer this data to the con-troller:

• PLC with integratedIO-Link ports or

• decentralised modules withintegrated IO-Link ports.

Compatibility

IO-Link units can be used withoutany problems on digital I/Owithout IO-Link port. IO-Linksensors then only work in thestandard I/O mode with a binaryswitching signal.

When using an IO-Link modulethe parameter data can be readfrom the sensor, stored and incase of a replacement loaded to anew sensor of the same type.

This can even be done with on-going process. To do so, no spe-cial knowledge is required.

IO-Link – data thatconvinces:

Open interface analogue /digital.

Serial point-to-pointconnection – no bus wiring.

Standard I/O connectiontechnology.

Maximum cable length20 m.

Signal transmission bymeans of 24 V pulse modu-lation and standard UARTprotocol.

Standardisation to IEC inpreparation.

“Mixed operation” possible(binary switching signal orserial data transmission).

Cyclical process data trans-mission with a cycle time of2 ms.

Integrated, differentiateddiagnostic messages.

PLC

FDT / DTM

DTM

gateway

IO-Link module

AS-inte

For industrialapplications

DTM

erface

Industrial Ethernet

bus communication

point-to-point

communication

Process data

Binary signals aretransmitted bycontinuous com-munication or, asdone so far, inswitching opera-tion.

Analogue valuesare digitalised andtransmitted bycontinuous com-munication.

Data transmission to the PLC: e.g. withthe IO-Link module.

Flow of information overthe last metre.

Requested data

• configuration data• setting data• device identification• messages• fault analysis• fault location IO-Link module

The point-to-point communicationinterface takes the physical signals ofIO-Link and standard sensors andtransfers them to the next higher buslevel (AS-interface).The module combines the advantagesof reduced bus wiring with thepossibility of transmitting diagnostic,parameter and process data ofintelligent IO-Link units.Conventional sensors and actuatorscan also be connected.

L+

L-

C/Q12

34

pin

1

2

3

4

signal

L+

out

L-

C/Q

remark

24 V

depend. on sensor

ground

communication/switching signal

IO-Link

SIO

IO-Link module

IO-Link PLC

Optical distance detectionThe efector pmd laser sensor is usedfor distance detection to within amillimetre for ranges up to 10 m.It operates by the time-of-flightprinciple.

Process data via IO-Link:continuously measured distancesParameter data via IO-Link:setting of the sampling rateDiagnosis via IO-Link:object outside the measuring range

Capacitive sensorsNon-contact detection of any objects.In contrast to inductive sensorscapacitive sensors can also detect nonmetallic materials.

Process data via IO-Link:binary switching signalParameter data via IO-Link:adjustment parametersDiagnosis via IO-Link:uncertain sensing range

Flow sensorsSensors operating to the calorimetricprinciple are an excellent choice tomonitor gases and liquids.

Process data via IO-Link:binary switching signalParameter data via IO-Link:switch points and NC/NO functionDiagnosis via IO-Link:incorrect parameter setting

Level sensorsefector gwr level sensors operateon the basis of guided wave radar.Applications are water-based media,e.g. coolants and cleaning liquids.Due to its compact design the sensoris also suitable for small tanks andaggregates.

Process data via IO-Link:continuous levelParameter data via IO-Link:set switching hysteresisDiagnosis via IO-Link:uncertain zone

IntelligentIO-Link sensors

Pressure sensorsThe compact pressure sensors areextremely robust against mechanicalinfluence and work completelywithout wear and fatigue. Theresulting long-term stability ensuresreliable measurement results over100 million pressure cycles.

Process data via IO-Link:binary switching signalParameter data via IO-Link:switch point settingDiagnosis via IO-Link:incorrect parameter setting, over-pressure and self-diagnosis of themeasuring system.

The FDT containersoftware allows

access to all sensorparameters.

AS-interface andIO-Link comple-ment each otherin the best possi-ble way. AS-i is aserial bus systemwith a master andup to 62 slaves ona common com-munication cable.IO-Link is a con-nection betweenonly one unit andexactly one coun-terpart (port).These IO-Linkports can be inte-grated directlyinto controllers or

Hand in hand:IO-Link and AS-interface

in decentralisedbus modules.

The use of IO-Linkcompatible busmodules combinesthe advantagesof wiring savingwith the diagnos-tic options ofintelligent IO-Linksensors.

For the definitionof IO-Link specialemphasis wasplaced on thecompatibility withconventional unitswith a simple

binary outputstage. In the stan-dard I/O modeIO-link sensors canalso be operatedon conventionalinput modules.

Conversely, sensorswith switchingoutput also workon IO-Link inputports. This enablesa step-by-stepchangeover ofexisting installa-tions dependingon the requiredinformation.

Mixed variantsconsisting of busmodules andsensors in conven-tional and IO-Linkversion can also beused for new in-stallations.

Bottom line:IO-Link is an excel-lent choice for usewith the fieldbussystem AS-inter-face. Advantages:less wiring, simple“plug & play” andadditional diag-nosis.

The FDT technolo-gy standardisesthe communica-tion interface be-tween field devicesand the systemenvironment(host). The specialfeature of thistechnology is thatit is independent

Looking into the sensor – withthe FDT container software.

of the communica-tion protocol usedand of the respec-tive software envi-ronment.

The user is alsofree to choose theunit to be usedand the controlsystem used. Inbrief: with FDT it is

possible to addressany unit via anysystem using anyprotocol.

With IO-Link theFDT technology iscomplementedand supported inthe best possibleway.

Over 70 locations worldwide – at a glance atwww.ifm-electronic.com

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Position sensorsand object recognitionInductive sensorsCapacitive sensorsMagnetic sensors,cylinder sensorsSafety technologyValve sensorsPhotoelectric sensorsObject recognitionEncodersEvaluation systems,power suppliesConnection technology

Fluid sensorsand diagnostic systemsLevel sensorsFlow sensorsPressure sensorsTemperature sensorsDiagnostic systemsEvaluation systems,power suppliesConnection technology

Bus systemsBus system AS-InterfacePower suppliesConnection technology

Identification systemsDataMatrix code-readingsystemsRF-identification systemsPower suppliesConnection technology

Control systemsControl systemsfor mobile vehiclesConnection technology

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