F_Plk - Siemens SIMATIC S7 F Manual

Fail-Safe Blocks
Error Information in Diagnostic Buffer
Error Code (W#16#...)
75DAH
8.6.7

F_PLK

Function
This block executes, among other things, logical program and data flow control
before the output blocks and provides a corresponding enable signal for this.
The block is inserted automatically into each F-run-time group before the output
blocks at compilation.
The block output FAILED is for internal use only.
I/Os
Name
Outputs: FAILED
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#...)
75DAH
75E1H
75E1H
75E1H
75E1H
75E1H
8-70
Description
Error in the safety data format (error due to online modification of the Safety
Program or internal CPU fault)
Data Type Explanation
BOOL F-run-time group failure
indication
Description
Internal CPU fault
Error during processing of F_CYC_CO
Error during processing of F_TEST
Error during processing of F_TESTC
Internal CPU fault
Error during program execution monitoring: error due to online modification of
the Safety Program or internal CPU fault
Default
0
Fail-Safe Systems
A5E00085588-03