Direct Data Exchange - Siemens S7-300 Installation Manual

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With CPU 31x-2 DP, do not set  as PROFIBUS address.
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In 67(3  V 5.x or later, you can configure "Direct data exchange" for PROFIBUS
nodes. CPUs with a DP interface can take part in direct data exchange as senders
and receivers.
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"Direct data exchange" is a special communication relationship between
PROFIBUS-DP nodes.
Characteristic of direct data exchange is that PROFIBUS DP nodes "listen" on the
bus for data a DP slave returns to its DP master. This mechanism allows "Listening
stations" (receivers) direct access to modified input data of remote DP slaves.
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In your 67(3  configuration of the relevant peripheral input addresses, specify
which address area of the receiving node is to receive data requested from the
sending node.
The following types of DP-CPU are possible:
• DP slave sending station
• receiving station, as DP slave or DP master, or as CPU not integrated in a
master system.
S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
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