Siemens SIMATIC S7 Configuration And Programming Manual page 33

1. User acknowledgment using an operator control and monitoring system with
which you can access the F-CPU of the I-slave
To implement a user acknowledgment using an operator control and monitoring
system, you require the F application block F_ACK_OP from the F-library
Distributed Safety (V1) (see manual, Section 5.7.3.7).
How to program the user acknowledgment using an operator control and
monitoring system with which you can access the F-CPU of the I-slave
Follow the steps as described in the manual, Section 5.3.9 under Procedure for
Programming User Acknowledgment by Means of an Operator Control and
Monitoring System.
Call the F_ACK_OP F application block in the safety program of your I-slave. In so
doing, note that the acknowledgment signal for evaluating user acknowledgments
is provided at output OUT of F_ACK_OP ("Output Q" specified in the manual is
incorrect!).
From your operator control and monitoring system, you can then access the
instance DB of F_ACK_OP on the I-slave directly.
Also note the associated safety notes in the manual.
2. User acknowledgment with an acknowledgment button on an F-I/O with inputs
that is assigned to the F-CPU of the intelligent DP slave
Note
If a communication error/F-I/O fault, or channel fault occurs in the F-I/O to which
the acknowledgment button is connected, it is no longer possible to send an
acknowledgment to reinclude this F-I/O.
This "block" can only be removed by a STOP/RUN change on the F-CPU of the
intelligent DP slave .
To allow acknowledgment and reinclusion of an F-I/O to which an
acknowledgment button is connected, it is advisable to plan a further
acknowledgment over an operator control and monitoring system with which you
can access the F-CPU of the I-slave (see 1.).
3. User acknowledgment using an acknowledgment button on an F-I/O with
inputs that is assigned to the F-CPU of the DP master
If you also want to use the acknowledgment button assigned to the F-CPU on the
DP master for a user acknowledgment in the safety program of the F-CPU of an
intelligent DP slave, you must transfer the acknowledgment signal using safety-
related master to I-slave communication (see Section 1.1.2 and 1.2.6) from the
safety program in the F-CPU of the DP master to the safety program in the F-CPU
of the intelligent DP slave.
Product Information for the S7 Distributed Safety, Configuring and Programming Manual
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