Operation
7.5 Communication via PROFIBUS DP
SINAMICS DCP
Operating Instructions, 09/2019, A5E34382853K
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7.5.4.2 Activating/parameterizing direct data exchange
The "direct data exchange" function must be activated in the publishers as well as in the
subscribers, whereby only the subscriber is to be configured. The publisher is automatically
activated during bus startup.
Activation in the publisher
The master is informed about which slaves are to be addressed as publishers with a
modified layer 2 function code (DXB req) via the configuration of the subscriber links.
The publisher then sends its input data not only to the master but also as a broadcast
telegram to all bus nodes.
These settings are made automatically using the bus configuration tool (e.g. HW Config).
Activation in the subscriber
The slave, which is to be used as subscriber, requires a filter table. The slave must know
which setpoints are received from the master and which are received from a publisher.
The filter table is created automatically via the bus configuration tool (e.g. HW Config).
The following diagram shows the information contained in the filter table.
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