5
5.10 Slave–to–slave communications (from SW 4.1)
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Siemens AG 2005 All Rights Reserved
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
The subscribers evaluate the broadcast telegrams, sent from the pu-
blishers, 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 (P0915).
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 set-
point via a tap.
Links are possible to the device itself. This means, e.g. that for a two–
axis 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.
The following limitations should be observed for the ”slave–to–slave”
communications function:
Drive ES Basic V5.1 SP1
Optional PROFIBUS–DP2 module SW 4.1
Optional PROFIBUS–DP3 module SW 4.1
SIMODRIVE 611 universal SW 4.1
Number of process data max. of 16 per drive
Number of links to publishers max. 3 and 1 internal
Number of taps per link max. 8
For example, the following applications can be implemented using the
”slave–to–slave communications” function:
Axis couplings (this is practical for clock cycle synchronous
operation) (refer to Chapter 6.3)
– Angular synchronism where the position reference value or posi-
tion actual value is entered
– Torque setpoint coupling (master/slave operation)
Master drive <––> Slave drive
Closed–loop speed controlled Open–loop torque controlled
Entering digital input signals from another slave (refer to Chapter
5.10.4)
Subscribers
Links and taps
Prerequisites and
limitations
Applications
5 Communications via PROFIBUS DP
07.0108.01
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