Automatic Reintegration May Not Always Be Possible - Siemens SIMATIC S7 F Manual

Programming
Reintegration After Error Correction
Reintegration means:
•
Valid process values are output again on the output channels of the fail-safe
output modules.
•
The F channel drivers of the fail-safe input modules forward valid process
values to the safety program again.
After an error/fault is corrected, a channel of a fail-safe module can be reintegrated
automatically or after a user acknowledgment. At the input ACK_NEC of an F
channel driver, you can specify whether a user acknowledgment is required:
•
Value 0: automatic reintegration without user acknowledgment
•
Value 1: request of user acknowledgment for reintegration after fault/error
correction
If passivation is caused by setting PASS_ON = 1, no user acknowledgment is
required for reintegration.
Automatic Reintegration
If the input ACK_NEC is not set, after the correction of the fault/error (with the
exception of communication errors) reintegration (depassivation) of the affected
channel is carried out automatically:
•
In the case of input modules - immediately
•
In the case of output modules - within minutes, due to the need for test signal
application
Note
After PROFIsafe communication errors, a user acknowledgement is always
required for reintegration (output ACK REQ set), even when ACK NEC is not set.
Safety Note – Automatic Reintegration may not always be possible
!
The parameterization of the input ACK_NEC=0 is only permitted if automatic
reintegration is permissible for the process from a safety point of view.
The permissibility of automatic reintegration depends on the process and must be
agreed with the acceptance authority.
Fail-Safe Systems
A5E00085588-03
5-25