Slave-To-Slave Communications (From Sw 4.1); General Information - Siemens SIMODRIVE 611 universal Function Manual

5 Communications via PROFIBUS DP
5.10 Slave–to–slave communications (from SW 4.1)
5.10 Slave–to–slave communications (from SW 4.1)
5.10.1

General information

Description
DP master Class 1
(e.g. SIMATIC S7)
Parameterizing master
Clock cycle generator
1)
Output data
DP slave
611U
Publisher
A
Fig. 5-30 Slave–to–slave communications with the publisher–subscriber
module
Publisher
5-314
For 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" communications function without involving the
master.
The following terms are used for the functions described here:
S
Slave–to–slave communications
S
Data exchange broadcast (DXB.req)
S
Slave–to–slave communications (is used in the following)
1)
Input data
Response
DP slave
611U
Subscriber
B A
For the "slave–to–slave communications" function, at least one slave
must accept the role of publisher.
The master addresses the publisher, when transferring the output data,
with a modified Layer 2 function code (DXB.req). The publisher then
sends its input data to the master with a broadcast telegram to all bus
nodes.
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
Engineering
PG/PC
HW Config
Drive ES Basic
DP slave
611U
Subscriber
B A
Links
1) From the perspective of the Class 1 master
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08.01 08.99 07.01
B