Execution Of An F-Stop In S7 F/Fh Systems - Siemens SIMATIC PCS 7 Operating Manual

7.4.5

Execution of an F-STOP in S7 F/FH systems

F-STOP illustration
Error in master:
Before a safety program in a redundant F CPU goes into F-STOP, it completes the following
steps:
● The S7 F/FH system performs a master-to-standby switchover.
● The previous master goes into the configured operating state (default setting:
TROUBLESHOOTING).
If no errors are detected, the F CPU reconnects.
Note
You can find more information in the manual titled "SIMATIC Fault-tolerant Systems S7-
400H" (https://support.industry.siemens.com/cs/ww/en/view/82478488).
If an error is detected, the previous master goes into FAULT mode (all LEDs on the affected
CPU flash).
On redundant F CPUs, errors on one communications partner will not stop program
execution.
Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB
Configuring the safety program
7.4 F-STOP
103