View
109
Download
6
Embed Size (px)
Citation preview
Peter Thomas – Control Specialists Ltd
Chairman PROFIBUS & PROFINET International Training Centre's
PROFINET Commissioning & Testing
2 PI UK
PROFINET - Overview 2
PROFINET is a member of a family providing industrial communications over Ethernet.
PROFINET is:
completely standard Ethernet (IEEE802.3).
High speed, operating at 100Mbit/s or faster over copper or fibre-optic cables,
makes use of existing IT standards. But, is “real-time” and deterministic,
PROFINET is very well thought out to incorporate all the requirements of automation and control systems.
PROFINET is totally compatible with PROFIBUS but is NOT PROFIBUS over Ethernet.
September 2017
3 PI UK
PROFIBUS v PROFINET 3
Feature PROFIBUS DP PROFINET
Network size 126 devices max. Effectively unlimited
Data Rate Up to 12M bit/s 100 Mbit/s
Update rate and prioritisation All devices have same
update rate and priority Different update rates and priorities
Controlling Station Class 1 Master IO Controller
IO Equipment Slave IO Device
Diagnostic / Configuration Tool Class 2 Master IO Supervisor
Protocols DPV0, DPV1, DPV2 PROFINET RT, ARP, DCP,
SNMP, LLDP, TCP/IP, HTTP, MRP
IT services Not possible Integrated in devices
Real-Time Yes Yes
September 2017
4 PI UK
PROFIBUS v PROFINET 4
Feature PROFIBUS DP PROFINET
Topology Typically linear bus but tree and ring
possible Linear, star, tree and ring
Redundancy Possible but manufacturer specific Simple and standardised
Engineering access Changes possible but needs
network restart Possible without disrupting
operation
Standard Diagnostics Yes Yes
Alarms Only on DPV1 Yes, with priority
Addressing By switch or over bus Over network
Network Devices Repeaters, Hubs, OLM’s Switches
Termination Switch-selectable Built into RJ45 connector
Cable 2 core shielded twisted pair 4 core shielded twisted pair
September 2017
5 PI UK
PROFINET – In operation 5
PROFINET
HTTP SNMP Socket
IP
TCP / UDP
Sensor system
PC SNMP/OPC server
PROFINET IRT Field devices PC
Internet Explorer
Real-Time RT IRT
Ethernet
PROFINET RT Field devices
September 2017
6 PI UK
PROFINET – Topology 6
Line
Tree
Star
Ring
September 2017
7 PI UK
PROFINET – IO Devices 7
Ethernet
IO-Controller
Configuration
Control/monitoring Alarms
Diagnosis
Status/Control
Parameters IO-Device
PROFINET Supervisor
E.g. PLC running application program.
E.g. PC or laptop running engineering tool application.
E.g. Field device with inputs/outputs
(Compare with PROFIBUS Class-1 master)
(Compare with PROFIBUS Class-2 master)
(Compare with PROFIBUS Slave device)
September 2017
8 PI UK
PROFINET – Commissioning Guideline 8
• This is one of several free-to-download guidelines documents available to members.
• It provides guidance on how to verify the installation aspects of the network as well as how to commission the live system.
• These tests are additional to the application-specific, System Acceptance Testing that would usually be performed.
Failure to follow these guidelines puts you at risk of having your application tests pass without a detailed knowledge of the underlying performance of your network !
September 2017
9 PI UK
PROFINET – Installation Acceptance 9
• Visual Checking of the cabling. • Point-to-Point electrical testing of the cabling using a
simple line tester. • Point-to-point acceptance testing of the cabling using an
Ethernet Function tester.
Installation Acceptance tests should ideally be performed by individuals who have Certified PROFINET Installer accreditation.
September 2017
10 PI UK
PROFINET – Installation Acceptance – Visual Checks 10
The guideline lists 23 individual checks that should be performed on each cable. Examples are
• Cable laid according to plan? • Maximum length of 100m observed? • Cable screen earthed at both ends to a previously
proven earthing system. • Cable separation rules followed?
September 2017
11 PI UK
PROFINET – Installation Acceptance – Cable Testing 11
The main criteria for the simple electrical
testing of PROFINET cables are:
• There are no short-circuits between any
wires.
• There are no short-circuits between any
wire and the screen
• There are no wire breaks.
• The shield is connected at both ends.
• The wire pairing has been observed
correctly.
September 2017
12 PI UK
PROFINET – Installation Acceptance – Cable Certification 12
• Simple line testers are designed to test the electrical aspects of the cable.
• The more advanced function and acceptance testers establish the ability of that cable to successfully transmit predefined data packages as well as determine cable length, attenuation and cross-talk.
September 2017
13 PI UK
PROFINET – Operational Qualification 13
• Checking that the addressing and naming of all IO devices are in conformance with the design specification.
• Determining other device-related information such as MAC addresses, Firmware versions etc.
• Establishing that the topology is in conformance with the design specification.
• Establishing the absence of discarded and error telegrams. • Establishing operational characteristics and absence of
telegram errors.
September 2017
14 PI UK
PROFINET – IO Device Identification 14
• Every PROFINET device has a world-wide unique MAC address assigned by the manufacturer.
• The MAC address is unique to that particular device and will change if the device is replaced with a spare.
• Before a device can take part in communications with an IO Controller, it must have been configured with a PROFINET Device Name.
• When the IO Controller initialises communication with the IO Device, it will allocate an IP address to it.
• Note - All real-time communications takes place using MAC addresses.
MAC Address: 00: 0E:CF:04:68:7A Device Name: MySensorName123 IP Address: 192.168.1.23 HW Version: 1.0 FW Version: 1.24
September 2017
15 PI UK
PROFINET – Topology – Line Depth 15
• Line depth is the number of forwarding switches between an IO Controller and an IO Device.
• The line depth will affect the cycle time that the device can be polled at.
September 2017
16 PI UK
Operational Quality Criteria 16
September 2017
17 PI UK
PROFINET – EMC Criteria 17
• EMC (Electromagnetic Compatibility) and Protective Earth (PE) issues are acknowledged as being the cause of a significant number of problems on Fieldbuses and Industrial networks like PROFIBUS and PROFINET.
• This is because of the ever-increasing frequencies that such systems operate at.
• Simply ensuring that the cable screen is connected to earth at both ends serves no purpose if the earth loop impedance at “typical” frequencies is too high.
September 2017
18 PI UK
PROFINET – Monitoring Tools 18
TO PROFINET NETWORK
Internet Browser
This permanent monitoring solution can be used during qualification and on-going support. It has no effect on the PROFINET network which will continue to operate even if power to the monitor is removed.
24v
Volt-Free Contact to PLC
September 2017
19 PI UK
PROFINET – Acceptance Specification 19
• A document like this acts as a formal record of the installation and operational qualification tests.
• It should clearly define roles and responsibilities. • Define the type of tools required to perform the tests and
typical specifications. • Each test should cross-reference back to the appropriate
section in the relevant design specification. • Have clear descriptions of the tests and unambiguous
acceptance criteria. • There should be space available for the tester to
sign/date each test and make notes.
September 2017
20 PI UK
Peter Thomas (Control Specialists Ltd)
Chairman of the
PROFINET & PROFIBUS International Training Centres
(PITC‘s)
Peter Thomas Control Specialists Ltd
PROFINET – Questions?
September 2017
21 PI UK 21 September 2017
Thankyou
Peter Thomas
Chairman of PI Training Centres
www.linkedin.com/in/petermthomas
Control Specialists Ltd
www.controlspecialists.co.uk
https://controlspecialists.co.uk/wp-content/uploads/2017/08/16012_Indu_Sol_EMC_brochure_2017.pdf