Siemens SIMATIC S7-400H System Manual page 459

Module
Control module FM 355–2 C
Control module FM 355–2 S
NOTICE
One-sided or switched function and communication modules are
not synchronized in the fault-tolerant system if they are in pairs, e.g. two identical FM 450
modules operating in one-sided mode do not synchronize their counter states.
S7-400H
System Manual, 03/2012, A5E00267695-11
Function modules and communication processors supported by the S7-400H
Order No.
6ES7 355–0CH00–0AE0
6ES7 355–0SH00–0AE0
Release
As of product version 1
as of firmware V1.0.0
As of product version 1
as of firmware V1.0.0
459