Fail-Safe Blocks
Fail-Safe Systems
8-136 A5E00085588-03
Safety Mode Activated/Deactivated Events Reported From Shutdown Logic
Full Shutdown of Entire Safety Program Activated– Reported from Shutdown Logic F_SHUTDN
Block
Error Code (W#16#...) Cause Remedies
75DEH
One or more F-run-time groups have detected a
critical fault and all F-run-time groups in the
Safety Program will be disabled.
Identify the cause of the shutdown and resolve
the issue. You may restart all of the shutdown F-
run-time groups through the RESTART input of
the F-FB F_SHUTDN located in the CFC chart
@F_ShutDn.
• Identify the failure in the
Run-time group.
-and-
• Restart the Shutdown
logic.
-or-
• Stop and ColdStart F-
CPU.
-or-
• Full Download to F-CPU.
Full Shutdown of Entire Safety Program Deactivated– Reported from Shutdown Logic F_SHUTDN
Error Code (W#16#...) Cause Remedies
74DEH
The FB F_SHUTDN has completed a re-
initialization of the whole Safety Program, all F-
run-time groups are enabled.
This would happen after the User causes a 0 ->
1 transition on the RESTART input of the FB
F_SHUTDN located in the CFC chart
@F_ShutDn.
Safety Program Initialization Start/End– Reported from Shutdown Logic F_SHUTDN
Error Code (W#16#...) Cause Remedies
75DFH
This would happen after the User causes a 0 ->
1 transition on the RESTART input of the FB
F_SHUTDN located in the CFC chart
@F_ShutDn. The FB F_SHUTDN begins a re-
initialization of all F-FBs in disabled F-run-time
groups.
Reinitialization may take several seconds
depending on the size of your Safety Program
and your slowest configured OB3x containing an
F-run-time Group.
74DFH
The FB F_SHUTDN has completed a re-
initialization of the Safety Program, all F-run-
time groups are enabled.
You may have to Reintegrate your I/O through
the F_QUITES function block – this is only
necessary if the F-run-time Group that was
shutdown contains F Module Driver blocks...
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