Applies To:
  • CitectSCADA 1.20 2.00 2.01 3.x 4.x 5.x
Summary:
There are a number of different Profibus protocols and they don't communicate between each other. This article is a short explanation of which Citect currently supports and which Driver to use. 

Solution:
The following can all run on the same physical hardware, the PC card and the networking cables are the same. The Softing PROFI-IF-PCAT card and the Siemens CP5412 card are identical, either can be used for the Citect SINEC and PROFI Drivers. Low level software drivers may be different. Devices on a Profibus network using different Profibus protocols cannot communicate with each other. Following is a brief summary of the different Profibus protocols.

Profibus FMS (Fieldbus Message Specification) (Siemens L2-FMS protocol)

  • interface at Layer 7
  • supported by Citect's PROFI, PROFIB, PROFIBNT, and PROFIBD drivers.

Profibus FDL(Fieldbus Data Link)

  • layer 2 interface (PLC code provides additional layers 3-7. PLC Code only available for S5 Series PLCs at present)
  • peer to peer PLC communications
  • Supported by Citect's SINECFDL (CP5412) and SFDL (CP5412A2) cards.

Profibus DP(Distributed Peripheral) (Siemens L2-DP protocol)

  • used for small distributed IO devices.
  • Supported using Citect's OPC driver at present - Softing OPC server is an OPC server that supports Profibus-DP. Please read KB Q2678.

S7 Protocol

  • Used by Siemens S7 range of processors
  • Supported using Citect's SSEVEN driver on Citect V5+

SINEC L2 TF

  • a Siemens layer 7 interface
  • supported by Citect's SINEC Driver (CP5412 card and Citect V3 only)
 
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