8. PROFINET network commissioning and testing - Peter Thomas
1 like2,365 views
Profinet is an industrial communication standard over Ethernet, offering high-speed, real-time, and deterministic data transmission while being compatible with Profibus. The document provides guidelines for commissioning, installation acceptance, and operational qualification of Profinet networks, emphasizing various testing protocols and procedures to ensure reliable performance. Additionally, it covers the importance of EMC criteria and monitoring tools for ongoing network support.
8. PROFINET network commissioning and testing - Peter Thomas
- 1. Peter Thomas – Control Specialists Ltd Chairman PROFIBUS & PROFINET International Training Centre's PROFINET Commissioning & Testing
- 2. 2PI 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. 3PI 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. 4PI 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. 5PI UK PROFINET – In operation 5 PROFINET HTTP SNMP Socket IP TCP / UDP Sensor system PC SNMP/OPC server PROFINET IRT Field devicesPC Internet Explorer Real-Time RT IRT Ethernet PROFINET RT Field devices September 2017
- 6. 6PI UK PROFINET – Topology 6 Line Tree Star Ring September 2017
- 7. 7PI UK PROFINET – IO Devices 7 Ethernet IO-Controller Configuration Control/monitoring Alarms Diagnosis Status/Control ParametersIO-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. 8PI 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. 9PI 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. 10PI 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. 11PI 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. 12PI 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. 13PI 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. 14PI 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. 15PI 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. 16PI UK Operational Quality Criteria 16 September 2017
- 17. 17PI 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. 18PI 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. 19PI 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. 20PI 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. 21PI UK 21September 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