Siemens SINAMICS S120 Installation And Start-Up Manual page 140

Communication via PROFIBUS
Motion control with PROFIBUS
Position control loop
Master with
function
"Motion control
with PROFIBUS"
Fig. 4-16 Overview of "Motion control with PROFIBUS" (example: master and 3 slaves)
Structure of the data cycle
The data cycle comprises the following elements:
1. Global Control telegram
2. Cyclic part
– Setpoints and actual values
3. Acyclic part
– Parameters and diagnostic data
4. Reserved part
– Transmission of token
– For searching for a new node in the drive line-up
– Waiting time until next cycle
4-140
NSETP_A
G1_XACT1
Clock cycle
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
Speed Power
control control
E Siemens AG, 2004. All rights reserved
Indirect
Direct
measuring system
measuring system
(motor encoder)
(motor encoder)
~
M G
G
Additional
measuring system
taktsynchron_01.vsd