Communication Options
3.5 Communication between F-CPU and F-I/O
Safety Engineering in SIMATIC S7
System Manual, 04/2006, A5E00109529-05
3-9
Communication Overview
Figure 3-5
S7 Distributed Safety: Safety-related I-Slave-Slave Communication
I-Slave-Slave Communication
In safety-related I-slave-slave communication, F-I/O are accessed the same as standard I/O
using the process image (PII and PIO). The I/O cannot be accessed directly. The channels
of an F-I/O can only be accessed from one F-runtime group.
Required User Steps
The user performs the following steps for safety-related I-slave-slave communication:
1. Configure I-slave and slave in
HW Config.
2. Configure the DP master system in
HW Config.
3. Connect the I-slave to the slave.
4. Set the address areas for data exchange in
HW Config in the "Object Properties" dialog
of the I-slave.
5. Once the safety program has been created, generate and download it to the F-CPU of
the I-slave.
Further Information
For detailed information on configuring
safety-related I-slave-slave communication, refer to the
S7 Distributed Safety Configuring
and Programming manual.
