Slave-To-Slave Communication; General Information - Siemens SINAMICS DCM Operating Instructions Manual

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Slave-to-slave communication

For PROFIBUS DP, the master addresses all of the slaves one after the other in a DP cycle.

In this case, the master transfers its output data (setpoints) to the particular slave and

receives as response the input data (actual values). Fast, distributed data transfer between

drives (slaves) is possible using the "slave-to-slave communication" function without direct

involvement from the master.

The following terms are used for the functions described here:

● Slave-to-slave communication

● Data Exchange Broadcast (DXB.req)

● Slave-to-slave communication (is used in the following)

With the "slave-to-slave communication" function, at least one slave must act as the

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 to the

master with a broadcast telegram to all bus nodes.

SINAMICS DCM DC Converter

Operating Instructions, 1.2012, C98130-A7066-A1-05-7619

Slave-to-slave communication with the publisher-subscriber model

Descriptions of functions

10.2 PROFIBUS