C4 small scale pa application, james powell

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Small Scale PROFIBUS PA. Application story of a customer who has switched from Ex HART to IS PROFIBUS PA utilizing a multi-vendor solution - James Powell, Siemens Process, Canada

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C4 small scale pa application, james powell

  1. 1. Restricted © Siemens AG 20XX All rights reserved. siemens.com/answers Small Scale PA Presented by: James Powell, P.Eng.
  2. 2. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 2 Author / Department Agenda •What has changed? •The application •The HART solution •The problem with HART/ why PA •The PA solutions •How do the economics work out?
  3. 3. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 3 Author / Department What has changed? Up until the last few years, the cheapest Profibus master was still over a thousand £. Then… -HMS Ethernet to Profibus gateway (~450 £) -S7-1200 micro PLC with Profibus interface (~500 £) -IFAK gateways (~1200 £) Plus, to link to PA, last year there were two manufacturers, now there are 4: -Siemens -P+F -Procentec -IFAK Profibus is not just for large applications anymore!
  4. 4. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 4 Author / Department Application: Small Scale Oil and Gas
  5. 5. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 5 Author / Department The HART solution Multi-drop HART Used a HART to Modbus RTU converter (HCS by Moore Industries) 3.6 mA I total = 8*3.6 = 28.8 mA200 ohms 5.76 V 28V 22.24 V Minimum Voltage for LR250 ~ 18.2 V Results 90% of sites worked with the odd problem 9% of sites were problematic 1% of sites did not work at all
  6. 6. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 6 Author / Department Problem with HART -Sizing the HART resister (having to modify it in cold weather operation) -HART waveform 3.6 mA I total = 8*3.6 = 28.8 mA200 ohms 5.76 V 28V 22.24 V Minimum Voltage for LR250 ~ 18.2 V
  7. 7. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 7 Author / Department Why Profibus PA? Very robust physical layer Easier to put together than multi-drop HART (no HART resister to size) New features possible: - IS wiring possible - status information - transparency to the instrument
  8. 8. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 8 Author / Department Robust Physical Layer - Examples Jetso-Diesel Orange Sky Univar Baker Petrolite
  9. 9. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 9 Author / Department Simple Wiring Simple Trunk wiring No fancy junction boxes Simple terminal strips No HART resister
  10. 10. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 10 Author / Department Flame-proof vs. Intrinsically Safe  Rigid Conduit  Epoxy Seals  Expensive fittings  Longer time to install  Not very flexible  More expensive  Can’t do live service  Not as safe  Flexible cable  Plastic cable glands  Simple to install  Safer (less prone to human error)  Live servicing EX Proof Costs $$ Intrinsically Safe
  11. 11. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 11 Author / Department Status Information is transmitted each time BYTE 1 BYTE 2 BYTE 3 BYTE 4 STATUS IEEE FLOATING POINT VALUE STATUS BYTE
  12. 12. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 12 Author / Department Transparency* to the Instrument is now possible with new hardware! *Note: Transparency can be done with HART as well, but not with the hardware they were using
  13. 13. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 13 Author / Department 1st Trial Site! Picked the site that HART would not work at all Replaced the LR250 HART heads with LR250 PA heads Changed the wiring Used simple terminal strips It worked right away! No repeats and a perfect waveform!
  14. 14. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 14 Author / Department The current solution! PROFIBUS Pa (31.25 K bit/s) CLASS 1 DIV 1 PROFIBUS Pa (31.25 K bit/s) GSM/GPRS Modem Ethernet Switch Micro-PLC (Schneider Electric) SITRANS LR250 Anybus Gateway (Profibus master on One side and Modbus TCP/IP server on the Other side) Siemens DP/PA Ex Couplers Pactware with SITRANS DTM INDUSTRIAL ETHERNET MODBUS TCP/IP
  15. 15. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 15 Author / Department The current solution!
  16. 16. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 16 Author / Department Economics of PA and IS instead of Ex construction Multi-drop HART (using Ex) -Used cheaper gateway -Had no transparency -Expensive Ex fittings -Because of Ex fittings, instruments are hard to remove - HART comms did not always work Profibus PA (using IS) -Used cheaper fittings -Did not have be careful with conduit -Had a more expensive gateway -Required couplers -Instruments were slightly more expensive -Had transparency -Worked! For their typical application, the Profibus solution was only between 15% and 20% more expensive then HART multi-drop, but cheaper when you take into account that: - Profibus worked! - Transparency could reduce site visits - if you have to change an instruments, it was now easy!
  17. 17. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 17 Author / Department Alternate Solution PROFIBUS Pa (31.25 K bit/s) CLASS 1 DIV 1 PROFIBUS Pa (31.25 K bit/s) GSM/GPRS Modem Micro-PLC Ethernet Switch IFAK IsNet Lite with Modbus and PA module Pactware with SITRANS DTM LR250 This has a lower capital costs Profinet
  18. 18. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 18 Author / Department
  19. 19. 20XX-XX-XX Restricted © Siemens AG 20XX All rights reserved. Page 19 Author / Department Contact James Powell Business Developer Process Instruments / Siemens Canada 1954 Technology Dr. Peterborough, Ontario, Canada, K9J7B1 Phone: +49 (123) 45 67 89 Fax: +49 (123) 45 67 89 Mobile: +49 (123) 45 67 89 0 E-mail: james.powell@siemens.com siemens.com/answers

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