Siemens SINAMICS DCM Operating Instructions Manual page 320

Descriptions of functions
10.2 PROFIBUS
Figure 10-4
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.
Subscriber
The subscribers evaluate the broadcast telegrams, sent from the publishers, and use the
data which has been received as setpoints. The setpoints 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 (connection to publisher) contain the following
information:
● From which publishers may input data be received?
● Which input data are there?
● At which location should the input data be used as setpoints?
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.
320
Slave-to-slave communication with the publisher-subscriber model
SINAMICS DCM Control Module
Operating Instructions, 06.2010, C98130-A7067-A1-02-7619