Safety-Related I-Slave-Slave Communication In Distributed Safety - Siemens SIMATIC S7 System Manual

Communication Options
3.5 Communication between F-CPU and F-I/O
Variables for F-I/O Communication
Certain variables must be initialized by the user in the safety program in the F-I/O DB:
• Variables for acknowledging communication errors and F-I/O or channel faults for
In addition, certain variables can be initialized and evaluated in the F-I/O data block:
• Evaluation of whether the output value represents process data or a fail-safe value
• Setting for automatic or manual reintegration of process data
• Passivation of other F-I/O or channels, for example, for group shutdown of associated
• Display of whether or not an acknowledgment is required for reintegration of F-I/O
• Display of service information (type of fault)
Additional Information
For a detailed description of the F-I/O DB variables and how to initialize and evaluate them,
refer to the
See also
Structure of the Safety Program in S7 Distributed Safety (Page 7-4)
3.5.3 Safety-Related I-Slave-Slave Communication in S7 Distributed Safety
Introduction
In S7 Distributed Safety, safety-related I-slave-slave communication between the safety
program of the F-CPU of an I-slave and F-I/O of a slave is performed with direct data
exchange – as it is in standard programs. The process input image is used to access the
channels of the F-I/O in the safety program of the F-CPU of the I-slave (PII and PIO).
Restrictions
Note
S7 Distributed Safety
In
with the F-I/O of a slave that supports I-slave-slave communication, for example ET 200S
modules with IM 151-1 HIGH FEATURE, Order No. 6ES7 151-1BA01-0AB0 and higher. Any
of the F-CPUs for
3-8
reintegration of F-I/O
F-I/O
S7 Distributed Safety Configuring and Programming
V5.4, safety-related I-slave-slave communication can be take place
S7 Distributed Safety
can be used as the F-CPU in the I-slave.
System Manual, 04/2006, A5E00109529-05
manual.
Safety Engineering in SIMATIC S7