Siemens SINAMICS S120 Function Manual page 422

Communication PROFIBUS DP/PROFINET IO
10.2 Communication via PROFIBUS DP
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 is there?
● A 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.
Links are possible to the device itself. This means, e.g. for a Double Motor Module, data can
be transferred from drive A to B. This internal link corresponds, as far as the timing is
concerned, to a link via PROFIBUS.
Prerequisites and limitations
The following limitations should be observed for the "slave-to-slave" communications
function:
● Drive ES Basic V5.3 SP3
● Firmware version ≥ 2.4
● Number of process data, max. per drive
● Number of links to Publishers
● Number of taps per link
Applications
For example, the following applications can be implemented using the "slave-to-slave
communications" function:
● Axis couplings (this is practical for isochronous mode)
● Specifying binector connections from another slave
422
– Angular-locked synchronism where the position reference value or position actual
value is entered
– Torque setpoint coupling (master/slave operation)
Master drive speed controlled <–> slave drive torque controlled
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Drive Functions