1.1.3 Configuring Safety-Related Master to I-Slave Communication
Overview
Safety-related master to master communication is described in the manual.
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 a standard system, safety-related
communication between the safety program of the F-CPU of a DP master and the
safety program(s) of the F-CPU(s) of one or more intelligent DP slaves (I-slaves) is
handled over master to I-slave connections.
You do not need any additional hardware for the master 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 2048
F_ RCVDP: LADDR 2060
F_ RCVDP: LADDR 256
F-CPU 2
Safety Program Safety Program
Local addr 256
HW Config
Local addr 268
F_SENDDP: LADDR 268
DP Master I-slave
Partner addr 2048
Partner addr 2060
Product Information for the S7 Distributed Safety, Configuring and Programming Manual
A5E00169432-02
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