Table 7- 1 Causes Of Error Leading To Redundancy Loss - Siemens SIMATIC PCS 7 CPU 410-5H System Manual

Operator controls and operating modes of the CPU 410-5H
7.1 Operating modes of the CPU 410-5H
Redundant system mode
The master CPU and standby CPU are always in RUN when operating in redundant system
mode. Both CPUs execute the user program in synchronism, and perform mutual checks.
In redundant system mode it is not possible to test the user program with breakpoints.
The redundant system state is only supported with CPUs of the same version and firmware
version. Redundancy will be lost if one of the errors listed in the following table occurs.
Table 7- 1
Cause of error
Failure of one CPU
Failure of the redundant link (synchronization
module or fiber-optic cable)
RAM comparison error
Redundant use of modules
Modules interconnected in redundant mode (e.g. DP slave interface module IM 153-2) must
be in identical pairs, which means the two redundant linked modules have the same article
number and product or firmware version.
100
Causes of error leading to redundancy loss
Reaction
Failure and replacement of a CPU during redun-
dant operation (Page 185)
Failure and replacement of a synchronization
module or fiber-optic cable (Page 191)
ERROR-SEARCH mode (Page 104)
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB