Fail-Safe Blocks
Fail-Safe Systems
A5E00085588-03
8-71
8.6.8 F_PLK_O
Function
This block executes, among other things, logical program and data flow control
after the output blocks and provides a corresponding enable signal for this.
The block is inserted automatically into each F-run-time group after the output
blocks at compilation.
I/Os
The block has no visible I/Os.
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
75E1H
Internal CPU fault
75E1H
Error during program execution monitoring: error due to online modification of
the Safety Program or internal CPU fault
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