1.1.2 Safety-Related CPU-CPU Communication
Note
This section and the following sections 1.1.3 and 1.1.4 are valid only if you are
using S7 Distributed Safety V 5.2 + SP 1 with STEP 7, ≥ V 5.2 + SP 1.
If you are using STEP 7, ≤ V 5.2, the information in Section 1.1.1 applies.
Overview
The schematic below shows you an overview of the 3 options for safety-related
CPU-CPU communication in S7 Distributed Safety F-systems.
In safety-related CPU-CPU communication, a fixed amount of fail-safe data of the
data types BOOL and INT is transferred fail-safe between the safety programs in
F-CPUs of DP masters/intelligent DP slaves.
The data transfer makes use of F-application blocks F_SENDDP for sending and
F_RCVDP for receiving. The data is stored in configured address areas of the DP
master/intelligent DP slave (I-slave).
PROFIBUS
subnet 2
DP masters
PROFIBUS
subnet 1
DP masters
I-slave I-slave
DP Slave
I-slave
DP/DP
coupler
A
Safety-related master to master communication (via DP/DP coupler)
B
Safety-related master to I-slave communication
C
Safety-related I-slave to I-slave communication
A
B
B
C
DP master system 1
DP master system 2
B
Further Information
Safety-related master to master communication is described in the Manual.
Safety-related master to I-slave communication and safety-related I-slave to I-slave
communication are described in the following sections of this product information.
Product Information for the S7 Distributed Safety, Configuring and Programming Manual
12 A5E00169432-02
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