Siemens S7-300 - Direct Data Exchange with Cpus 31 X-2 DP

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
9-34 A5E00203919-01
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The sample in the figure below shows the relationships you can configure for direct
data exchange. In the figure, all DP masters and DP slaves are a CPU 31x-2 DP.
Note that other DP slaves (ET 200M, ET 200X, ET 200S) can only operate as
sending node.
CPU
DP master 1
PROFIBUS
CPU
DP slave 3
DP slave 5
CPU
DP slave 1
DP master
system 1
DP master
system 2
CPU
DP master 2
CPU
DP slave 2
CPU
DP slave 4
Figure 9-10 Direct data exchange with CPUs 31x-2 DP