Siemens SINAMICS S110 - Slave-To-Slave Communication; General Information

Communication
9.3 Communication via PROFIBUS DP
Function Manual
602 Function Manual, 01/2011, 6SL3097-4AB10-0BP3
9.3.4 Slave-to-slave communication
9.3.4.1 General information
Description
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 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)
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Figure 9-24 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
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.