Function Blocks for SIMATIC S7–400 for 6DL3100–8AA/–8AB The AddFEM is ”represented” by CFC function blocks (driver function blocks) in the S7 CPU. The driver takes over the format conversion, data transportation and monitoring of the AddFEM. The blocks can be used both for standard use (single operation) as well as for all the provided redundancy configurations.
There are several operating modes possible:
Operating Mode 0 – Single Operation
Redundant AS (Operating Mode 1)
Redundant AddFEM (Operating Mode 2)
AS Redundant and AddFEM Redundant (Operating Mode 3)
For more refer to OEM manual AddFEM