Programming Reintegration Following Module Errors Or Channel Errors Requiring Acknowledgment - Siemens SIMATIC PCS 7 Operating Manual

Configuring the safety program
7.7 Passivation and reintegration of input/output channels
7.7.5 Programming reintegration following module errors or channel errors requiring
acknowledgment
A value of 1 at the ACK_REQ output of the F-channel driver indicates that the error has been
eliminated and user acknowledgment for reintegration is possible.
When the ACK_NEC input is set, reintegration of the input or output channel is only
performed a positive edge at the ACK_REI input of the F-channel driver.
Options for user acknowledgment
● Connection of an acknowledgment button to a fail-safe digital input module.
● Manual input from an ES/OS station using the F_QUITES block
Note
The figure is available in its original size as appendix to the manual in the ZIP download of
the checklists.
If you use an acknowledgment button for user acknowledgment, in the event of a module
error on the F-signal module group to which the acknowledgment button has been
connected, you will no longer be able to trigger acknowledgment to reintegrate this F-signal
module group. An additional acknowledgment option must be provided for this module
group, for example: using an "F_QUITES" block.
Therefore, in cases where you are setting up acknowledgment for reintegration of an F-
signal module group to which an acknowledgment key is connected, we recommend
providing another means of acknowledgment via an OS.
Note
Automatic user acknowledgment is not permitted.
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Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB