Siemens SINAMICS DCM Manual page 441

Descriptions of functions
10.4 Communication via PROFIBUS DP
Figure 10-18 Direct data exchange with the publisher-subscriber model
Publisher
With the "direct data exchange" function, at least one slave must act as the publisher.
The publisher is addressed by the master when the output data is transferred with a modified
layer 2 function code (DXB.req). The publisher then sends its input data for the master with a
broadcast telegram to all bus nodes.
Subscriber
The subscribers evaluate the broadcast telegrams, sent from the publishers, and use the
data which has been received as setpoints. These setpoints of the publisher are used, in
addition to the setpoints received from the master, corresponding to the configured telegram
structure (p0922).
Links and taps
The links configured in the subscriber (connections to publisher) contain the following
information:
● From which publisher is the input data received?
● What is the content of the input data?
● Where are the additional setpoints received?
Several taps are possible within a link. Several input data or input data areas, which are not
associated with one another, can be used as setpoint via a tap.
Links are possible on the drive unit itself. This internal link corresponds, as far as the timing
is concerned, to a link via PROFIBUS.
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Operating Instructions, 02.2015, A5E34763375/RS-AA/001
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