PROFIBUS. Design and. Good Practices

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Catherine Gilbert
8 years ago
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1 Design and Good Practices

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3 3 ERP DCS MES Ethernet backbone PA coupler PA link PA Author / Title of the presentation PA DP

4 - Principle 4 To create hierarchy in the network, defines 2 types of stations: active (masters) and passive (slaves). master commands slave responses network At least 1 master is mandatory. networks allow multiple masters. In total 127 stations can be addressed (masters + slaves). Dominique Chabauty / Design and good practices

5 5 Supports 3 transmission media RS wire CU-cable for general purposes Fiber Optic Highest EMC protection and wide distances Coupler MBP-IS 2-wire CU-cable with the option for power over the bus and Ex-protection Dominique Chabauty / Design and good practices Coupler Fiber optic cable

6 Total Overview of the Technology 6 App. Profiles II App. Profiles I Comm. Physical Layer PA Devices IEC 61158/61784 RS 485 RS 485-IS RIO for PA SEMI PROFIdrive V2.0 and V3.0 Identification Systems Common Application Profiles (optional): PROFIsafe, Time Stamp, Redundancy, etc. NRZ Intrinsic Safety DP Fiber Optics: Glass Multi Mode Glass Single Mode PCF / Plastic Fiber MBP MBP-LP MBP-IS Weighing & Dosage FDL + DP- V0...V2 Encoder Manchester Bus Powered Low Power Intrinsic Safety Integration Technologies Descriptions (GSD, EDD) Tools (DTM, Configurators) Dominique Chabauty / Design and good practices

7 DP - General 7 communicates over a two wire bus structure. listen, taking over and answering T 9 listen sending Devices are addressed through a network address (0..126). Devices are coupled in parallel to the bus. Devices can be hot swapped and position does not matter. Each segment is terminated at both end with an active termination Spurs should be avoided as length is very limited 1 listen 43 listen 117 T Dominique Chabauty / Design and good practices

8 DP - Repeaters 8 Single Repeaters Segment 2 Segment 1 Stations Stations Hubs Backbone Segment 1 Segment 2 Benefit: Isolate part of your network from EMC/Noise Dominique Chabauty / Design and good practices

9 DP Fiber Optic 9 Classic Topology Coupler Coupler Fiber optic cable Coupler Coupler Ring Topology Coupler Coupler Fiber optic cable Benefits: Long distances and EMC/Noise isolation Dominique Chabauty / Design and good practices

10 DP - Wireless 10 Connect your slaves through wireless couplers Wireless gateway Wireless gateway Wireless gateway Wireless gateway Segment Dominique Chabauty / Design and good practices Wireless DP Device Wireless PN Device

11 DP - Redundancy 11 RS 485 RS 485 RS 485 RS 485 RS 485 coupler coupler glasvezel coupler coupler glasvezel RS 485 RS

12 PA - Overview 12 DCS/PLC DP 24 V DP/PA-Link PA Segment T + εx Junction Box Dominique Chabauty / Design and good practices

13 PA - Redundancy 13 DP IM 153, redundant DP Bus termination Automatic bus termination IM 153, redundant M M M DP/PA-coupler, redundant (M = master) DP/PA-coupler, redundant (M = Master) AFD Coupler Redundancy Coupler-Redundancy AFS PA Ring Redundancy Active Field Splitter PA Coupler-Redundancy Media redundancy based on a ring topology AFD Active Field Distributor PA AFD AFD Dominique Chabauty / Design and good practices

14 Transmission speed (baudrate) 14 offers the user the possibility to choose from 10 transmission speeds (RS 485). 9,6 19,2 45,45 93,75 187, kbps Remarks: The transmission speed determines the maximum cable length and vice versa. The transmission speed has to be set identically at all the masters on the same bus. Most slaves detect the baudrate automatically. Because of economic and technical reasons some products do not support all transmission speeds. Some older products do not support 45,45 kbps. 2.1

15 DP Cable Length 15 Baudrate vs Cable Length Baudrate (kbit/s) Segment length (m) Segment length (feet) baudrate transitions in which the cable length reduces with more than 50 %. These lengths are defined for 1 segment with 32 bus loads! 2.1

16 Device - Network 16 Address Map Service-, diagnosis- and programming tool Masters (class 1) Slaves (total 123 or 124) Address for: Set Slave Address 127 Broadcast address Most configuration tools block address 0 and 126 for slaves. Address 126 is a default address for slaves with software address settings. Address 127 is a broadcast address (only visible with a busmonitor). Maximum 124 DP slaves per bus!!!!!!! 2.0

17 Device - DP Segments 17 Maximum 32 loads per RS485 segments Max 30 Stations Max 31 Stations Segment 1 Segment 2 Devices that generate new segments: Repeaters Fiber Optic Couplers Wireless gateways After these devices, segment rules are the same. Dominique Chabauty / Design and good practices

18 rules 18 Grounding & Shielding is digital communication, not 4-20mA Ground at both end Ungrounded shield has no effect Dominique Chabauty / Design and good practices

19 rules 19 Power Lines Digital communication is sensitive to power lines Watch out for cable runs in trays Respect distances for air separation Power line too close Power line are removed Dominique Chabauty / Design and good practices

20 rules 20 Some examples with Power Lines Dominique Chabauty / Design and good practices

21 rules 21 Proper wiring and component selection Wiring and cable termination is critical Wrong component selection leads to bad installation Take environment in account (humidity, sunlight ) Dominique Chabauty / Design and good practices

22 22 Recognizing bad installations You cannot use the multimeter, this is digital comm. Specific tools are required Cable Tester Oscilloscope Analyzer Find wiring errors such as short circuit Identify missing termination and EMC Capture error messages and find the source of your system shutdown Cost and time saving by using the right tools! Dominique Chabauty / Design and good practices

23 - Oscilloscope 23 Good signal Missing termination Dominique Chabauty / Design and good practices

24 - Analyzer 24 Capture all messages Useful for random errors Shows underlying conditions Device diagnostic Dominique Chabauty / Design and good practices

25 25 Certified by International Benefits Avoid basic errors that cost time and money Quality assurance for design and commissioning Faster project delivery Better installation, longer operation Various courses available Certified Engineer Certified PA Module Certified Installer PROFINET Certified Engineer Certified by Dominique Chabauty / Design and good practices

26 26 The end Thank you for listening Dominique Chabauty / Design and good practices

Introduction to PROFIBUS and PROFINET

Introduction to PROFIBUS and PROFINET Andy Verwer Technical Officer for PROFIBUS UK Verwer Training & Consultancy Ltd Gold distributor PROFIBUS Characteristics PROFIBUS is a bi-directional digital communication