Siemens SIMATIC S7 F Manual page 294

Fail-Safe Blocks
Error Handling
In the event of an error that is critical to safety, the system function SFC F_CTRL
is called. This records the event in the Diagnostic Buffer and requests a switch to
the reserve CPU if the error occurred only on the master CPU. For non-redundant
systems or a common-cause error occurring in both CPUs, the shutdown logic can
be configured to either disable the erred F-run-time group or the entire Safety
Program.
Error Information in Diagnostic Buffer
Error Code (W#16#...) Description
75DAH
See Also
Fail-Safe User Times
8-106
Error in the safety data format of the inputs PT and IN and the
output ET (error due to online modification of the Safety Program
or internal CPU fault)
Fail-Safe Systems
A5E00085588-03