Fail-Safe Blocks
Fail-Safe Systems
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the block by opening the Blocks folder of your F-Project and select the ALARM_8
block and press F1 for help.
Similarly, when a Notify Message is reported, the NFY_XXX outputs will return the
status of the NOTIFY_8P SFB call. To obtain help on the NOTIFY_8P error
outputs, obtain help for the block by opening the Blocks folder of your F-Project
and select the NOTIFY_8P block and press F1 for help.
Error Handling
Diagnostic events will be posted to the CPU Diagnostic Buffer when the transition
to a different shutdown logic state occurs: Partial shutdown, Full shutdown,
Restart, or Safety Mode Activated or Deactivated.
If the F_SHUTDN function block is configured with RQ_FULL set to FALSE (Partial
Shutdown), each detected shutdown F-run-time group will be reported as a
FAILURE. Those F-run-time groups that are shutdown may be restarted by
providing a rising edge to the RESTART input, which will also trigger an event to
be reported in the Diagnostic Buffer indicating a restart has been requested. If the
RQ_FULL is TRUE and a FAILURE is detected, the Safety Program will be
disabled through the FULL_SD output and this will also trigger an event indicating
a full system shutdown.
Startup Characteristics
The F_SHUTDN function block is intended to be available upon startup with the
entire Safety Program enabled.
Error Information in Diagnostic Buffer
Error Code (W#16#...) Description
72DDH & 73DDH
Safety Mode Activated/Deactivated.
75DDH & 74DDH
Partial Safety Program shutdown state entered (one or more F-run-time
groups are shutdown but SHUTDOWN is configured as “Partial“). The
FAIL_MSG block (contained within the RTG_LOGIC block) reports this
event. The DB# of the RTG_LOGIC block is included as extra information in
this diagnostic event. This will allow you to quickly identify the shutdown F-
run-time group (once you identify the RTG_LOGIC block that reported the
event, you can follow the connection from the FAILED input of the
RTG_LOGIC block to the F_PLK, F_CYC_CO, F_TEST, or F_TESTC
FAILED outputs.).
75DEH & 74DEH
Full Safety Program shutdown state entered (one or more F-run-time groups
shutdown and the configured response of SHUTDOWN was “Full“
75DFH & 74DFH
RESTART rising edge detected while in a Partial or Full shutdown.
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