F-Stop; Complete Shutdown; Partial Shutdown - Siemens SIMATIC PCS 7 Operating Manual

Configuring the safety program

7.4 F-STOP

7.4 F-STOP
In the event of an F-STOP, either the entire F program (full shutdown) or just the F -shutdown
group in which the error occurred (partial shutdown) is shut down. All F-runtime groups in an
F-shutdown group are shut down at the same time. The F CPU's standard user program will
continue to run in the event of an F-STOP.
When F shutdown groups are shut down:
● The outputs of the F signal modules controlled by the F-shutdown group are passivated.
● With S7 F Systems Lib V1_3 and higher, the F channel drivers of the F-shutdown group
set the QBAD outputs to "1" and QUALITY to "0".
● Safety-related communication between the F-shutdown group and other F CPUs is
interrupted.
● Data exchange between the F shutdown group and other F shutdown groups is
interrupted.
● Where data exchange between the safety program and the standard user program is
concerned, the standard user program is supplied with the last valid values.
● Block F_SHUTDN generates messages which are displayed automatically on the
PCS 7 OS. In the case of S7 F Systems Lib V1_3, the messages contain the following
text:
– Safety program: Partial shutdown
– Safety program: Complete shutdown
● The corresponding diagnostics events are written to the F CPU's diagnostics buffer.
7.4.1

Complete shutdown

All of the F-CPU's F-shutdown groups are shut down. Shutdown proceeds in the following
order:
● First, the F-shutdown group in which the error was detected is shut down.
● All other F-shutdown groups are then shut down within double the time period you set as
the F monitoring time for the slowest cyclic interrupt OB.
7.4.2

Partial shutdown

Only the F-shutdown group in which the error was detected is shut down.
100
Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB