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Siemens Sinec L2 (FDL protocol) ID:6


Interface Description

IGSS32 offers an interface for connection to SINEC L2 (PROFIBUS) networks using the FDL Protocol layer. SINEC L2 networks are based on industri standard PROFIBUS specifications which is used an a large number of industial applications. SINEC L2 networks are flexible and relatively easy to use yet offering fast and relaiable communication.

The communication driver uses the FDL protocol layer of the SINEC L2 bus specification to exchange data with Siemens (or other) PLCs connected to the SINEC L2 bus. Since the FDL protocol does not support FETCH and WRITE commands a special protocol has been applied on top of the FDL protocol. This protocol enables the PC to make FETCH and WRITE commands to connected PLC. The PLCs must have a function block installed which is handling this protocol. Function blocks for this purpose for Simatic S5 and Simatic S7 systems are available from Siemens A/S Denmark.

The PC has to be connected to the SINEC L2 network using a CP board which is supported by either SoftNet/S7, CP5412-A2 or compatible interface boards.

The IGSS32 system polls the PLC equipment cyclically according to one of four user-defined time intervals. The time intervals are configurable from 100 milliseconds to 999 seconds. The system automatically groups process data in data blocks - thus fully exploiting the the communication link in relation to the present configuration.

It is possible to apply event-oriented communication. Then the PLC equipment has control over when and which data to send to the IGSS32 system. In this way the use of available communication bandwidth can be optimised.

Technical Data

Electrical Interface:RS-485
Protocol:SINEC L2 (PROFIBUS) FDL and FETCH/WRITE.
Types of data:String, Fixed Point 8, 16, 28, 32, BCD 16, 32, Float 32, Timer, Counter, Siemens Teleperm, Fixed point 13 with 2 alarm bits.
PLC types supported:Simatic S5 series PLCs (95U, 115U, 135U and 155U) with CP5431 or compatible SINEC L2 interface (e.g. L2 port on 95U).

Simatic S7 series PLCs (S7/300 and S7/400) equipped with CP441-5 or compatible.

Function blocks for handling FETCH/WRITE protocol are available for most commonly used CPU types. For more information on how to purchace these function blocks please contact:

Siemens Denmark,
Mr. Steen Nielsen
Addressing:Node (PLC), block (DB), word (16 bit), bit offset (a whole number of words is read or written)
Supported platforms:Windows Vista, Windows XP, Windows 2003 Server, Windows 2000
Max. telegram size:240 bytes pr. Telegram
Throughput:Up til 6 telegrams pr. Channel pr. Second (depending on available bandwidth).
Max. number of nodes:32 pr. CP board.
PC hardware requirements:CP5412 and DP-5412/WindowsXX
CP5411, CP5511 or CP5611 and SoftNet-DP/WindowsXX
PC software requirements:CP5412 and DP-5412/WindowsXX
CP5411, CP5511 or CP5611 and SoftNet-DP/WindowsXX