Slave-To-Slave Communication; General Information - Siemens SINAMICS S120 Function Manual

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Communication PROFIBUS DP/PROFINET IO

10.2 Communication via PROFIBUS DP

Slave-to-slave communication

With 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

involving 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)

Figure 10-28 Slave-to-slave communication with the publisher-subscriber model

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

different layer 2 function code (DXB.req). The publisher then sends its input data to the

master with a broadcast telegram to all bus nodes.

Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5

Drive functions