Profinet design basics - Andy Williams
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The document discusses PROFINET, an industrial Ethernet network standard. It provides an overview of PROFINET features such as using switched Ethernet topology, separate channels for IO data and TCP/IP, and full-duplex communication. It also summarizes the different PROFINET classes (RT, IRT, NRT), how they handle synchronous vs. asynchronous data transmission. The document recommends using a network planning tool to simulate network utilization from PROFINET IO data and other traffic to identify potential overloads and optimize the network design.
Profinet design basics - Andy Williams
- 1. Andy Williams PROFINET - designing for performance PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland
- 2. 2PROFIBUS UK© 2018 PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland PROFINET - Introduction
- 3. 3PROFIBUS UK PROFINET features PROFINET is 100% "switched Ethernet“ (no need for repeater) ➔ The topology follows the production process Device diagnostics & network diagnostics in all PROFINET devices ➔ Reduction of downtime Separate channels for IO data and TCP/IP ➔ No extra network for TCP/IP needed PROFINET uses full duplex communication ➔ More applications on one cable Two-way simultaneous communication PROFINET uses IT standards (IEEE 802.3) Topology characteristics Integrated diagnostic functions
- 4. 4PROFIBUS UK One cable does it all 4 The right topology for every system • Support for star, tree, line or ring topologies • Various media available for networking: Cat5 copper cable, glass and plastic fiber-optic cables, and IWLAN • Access to machines and plants over a secure VPN connection, e.g. for remote maintenance purposes Topology based on design • Smaller cabling overhead and easier commissioning • Line topology and redundant ring structures possible without additional network components • Several controllers can be operated in one network → simultaneous access to one device with Shared Device and I- Device Line (Redundant) ring Star Tree Wireless communication (IWLAN) PROFINET PROFIsafe PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland © 2018
- 5. 5PROFIBUS UK 5 PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland © 2018 PROFINET vs. PROFIBUS
- 6. 6PROFIBUS UK Communication Cycle Application Cycle Device Cycle Field DeviceControl Field Device Drive PROFINET RT? RT applications are not synchronous: • Cycle time down to 1ms • 100Mbit/s bandwidth • Suitable 80% of all automation applications • Different non-synchronous cycles • Application, data transmission and field devices have their own processing cycles • Slower cycle time and more jitter than IRT PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland © 2018
- 7. 7PROFIBUS UK PROFINET IRT? Communication CycleApplication Cycle Device Cycle Field DeviceControl Field Device Drive IRT is synchronous data transmission • Cycle time down to 31.25µs • Application, data transmission and device cycle are synchronous Cycle time <1ms with jitter accuracy <1µs • 100Mbit/s bandwidth • Deterministic data & internet protocol at the same time PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland © 2018
- 8. 8PROFIBUS UK NRT? NRT is acyclic data transmission • Runs at same time, albeit with lower priority than RT/IRT • Unrestricted open TCP/IP data traffic • Non real-time for an acyclic data transmission (e.g. TCP / IP, UDP / IP) • 100Mbit/s bandwidth PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland © 2018
- 9. 9PROFIBUS UK PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland Merging of automation and IT-worlds … … increases network requirements © 2018 RT / IRT data Other TCP-data Quality gathering data Video Network load/traffic Long-term development of plants‘ network load High data volume through • Acquisition of quality data • High resolution videos • Web services • Cloud-connection In parallel to real-time data (RT/IRT) Poor design can lead to … overloads on single ports ... lower plant availability Impact
- 10. 10PROFIBUS UK PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland Guaranteed PROFINET IO communication © 2018 • … looks after PROFINET time-sensitive IO-Data transmission • … does not maintain data traffic consisting of both real- time and non real-time data (e.g. TCP/IP). • … does not support devices which are not configured using it (e.g. standard computers, camera systems, etc.) PLC engineering suite
- 11. 11PROFIBUS UK PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland Transparency using a network planning tool © 2018 • Simulation of the network utilization according to topology and network participants • Calculation of the network utilization • Of cyclic PROFINET IO-Data communication and • Of acyclic data communication (Remote Operate Server, cameras, computers, web server access, …) • Calculation across projects • Networks containing non-PROFINET devices Network planners support …
- 12. 12PROFIBUS UK 12 PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland © 2018 Free network load calculation tools https://www.profibus.com/download/profinet-installation- guidelines/
- 13. 13PROFIBUS UK PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland Typical PROFINET planning tool screenshot © 2018
- 14. 14PROFIBUS UK PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland Lorem ipsum dolor sit amet. Features of a PROFINET planning tool © 2018 • Import of TIA Portal and STEP 7 projects ✓ • Port granular simulation ✓ • Validation of the PROFINET planning guidance ✓ • Online scan function ✓ • Reporting with detailed results ✓
- 15. 15PROFIBUS UK 15 Calculation and simulation of the network utilization Calculation and simulation PROFINET IO data (RT/IRT) Non real-time data (NRT e.g. TCP IP) Calculation of different scenarios through selection and deselection of dataflows Displayed information Average bandwidth utilization Queues utilization of the ports Graphic display in case of a breach of configured thresholds PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland © 2018
- 16. 16PROFIBUS UK 16 PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland © 2018 Calculation and simulation of port load and bandwidth utilization Real-time data PROFINET RT / IRT Cyclic IO-Data Non real-time data TCP / IP communication e.g. IP camera, ... PN IO Data TCP/IP Data Port 1 Port 2 Port 3 Port 4 Queue 1 Queue 2 PN IO Data NRT Data PN IO NRT PN IONRT Bandwidth utilization Queue / port load 35%
- 17. 17PROFIBUS UK 17 PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland © 2018 Data flows & port load Port 1 Port 2 Port 3 Port 4 Queue 1 Queue 2 PN IO Data NRT Data PN IO NRT Queue / port load: 100% NRT PN IOPN IO NRT X NRT Data TCP/IP Data PN IO Data Real-time data PROFINET RT / IRT Cyclic IO-Data Non real-time data TCP / IP communication e.g. IP camera, ... PN IO
- 18. 18PROFIBUS UK Benefits Simulation of existing plant (e.g. if no project is present) Calculation of dataflows (e.g. TCP/IP traffic of computers, cameras, …) Online functions Topology scan Analysis of Pcap files (recorded by a TAP) Dataflows may be assumed into the current project or may be stored in the catalog as templates Online scan and Pcap analysis PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland © 2018
- 19. 19PROFIBUS UK PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland Recommendations for optimization © 2018 Shortest path to higher level networks/ high data volume Be mindful of load caused by standard (NRT) Ethernet devices Distribute automation applications across separate branches
- 20. 20PROFIBUS UK PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland Avoid ‘topological overlap’ © 2018 Multiple IO controller application High combined network load caused by shared path
- 21. 21PROFIBUS UK PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland Things to avoid! © 2018 Avoid high utilization of bandwidth, and queue memory
- 22. 22PROFIBUS UK PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland Line depth © 2018 ‘Store and forward ‘‘cut through’ + 26
- 23. 23PROFIBUS UK 23 PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland © 2018 Literature
- 24. 24PROFIBUS UK 24 PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland © 2018 Final thought! “When it comes to ‘Ethernet switches’ there are two types of people ... ... those who chose to use managed switches ... ... and those who wished they had ...”
- 25. 25PROFIBUS UK Thank you for your time! siemens.com/answers Andy Williams Siemens Applications Specialist PROFIBUS, PROFINET and IO-Link Seminar comes to Scotland © 2018