Siemens Sinamics S120 Function Manual page 615

● Slave-to-slave communication
● Data Exchange Broadcast (DXB.req)
● Slave-to-slave communication (is used in the following)
Figure 10-26 Slave-to-slave communication with the publisher-subscriber model
Publisher
With the "slave-to-slave communication" function, at least one slave must act as the
publisher.
The publisher is addressed by the master when the output data are 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).
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
10.2 Communication via PROFIBUS DP
Communication
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