Programming
Fail-Safe Systems
A5E00085588-03
5-27
User Acknowledgment by Means of OS/ES
You can use the F_QUITES block in the following way for fail-safe
acknowledgment using a non-fail-safe Engineering System or Operator Station:
1. Insert the F_QUITES block in the run-time group of the F channel driver.
2. Interconnect the ACK_REI input of the F channel driver with the OUT output of
F_QUITES.
!
Safety Note – Automatic Reintegration through F_QUITES
The non-safety-related input IN of F_QUITES must not be interconnected with a
signal or defined by a signal that automatically produces the above mentioned
condition (change from 6 to 9 within a minute) for a fail-safe acknowledgment. The
fail-safe acknowledgment can only be produced by means of conscious, manual
input on the ES/OS, not automatically in the program.
Behavior in the Case of Module Redundancy
In the case of module redundancy, user acknowledgment after reintegration is only
required if both redundant modules have a fault at the same time.
See Also
Error_Handling_of_Driver Blocks
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