1.1.4 Configuring Safety-Related I-Slave to I-Slave Communication
Overview
The manual describes safety-related master to master communication.
The following section describes the configuration of an additional safety-related
communication option, that is, safety-related communication between safety
programs in different F-CPUs. As in standard systems, safety-related
communication between the safety program of the F-CPUs of intelligent DP slaves
involves direct data exchange.
You do not need any additional hardware for I-slave to I-slave communication.
Communication by Means of F_SENDDP and F_RCVDP
Safety-related communication occurs by means of the F-application blocks
F_SENDDP and F_RCVDP that you used in the safety programs of the F-CPUs.
Configuring Address Areas
For every communication connection between two F-CPUs, you must configure
address areas in HW Config. In the figure below, each of the two F-CPUs is
supposed to be able to send and receive data.
F-CPU 1
F_SENDDP: LADDR 140
F_ RCVDP: LADDR 128
F_ RCVDP: LADDR 142
F-CPU 2
Safety Program Safety Program
HW Config
HW Config
F_SENDDP: LADDR 130
I-slave 1 I-slave 2
Local addr. 142
Local addr 128
Local addr 140
Local addr 130
Partner addr 142
Partner addr 140
ddresses are entered on
the partner automatically
Partner addr 130
Partner addr 128
Product Information for the S7 Distributed Safety, Configuring and Programming Manual
18 A5E00169432-02
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