Siemens SINAMICS S120 - Control and Status Words for Encoders

Communication via PROFIBUS
Cyclic communication
4-112
E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
4.3.4 Control and status words for encoders
Description
The process data for the encoders is available in various telegrams. For example,
telegram 3 is provided for speed control with 1 position encoder and transmits the
process data of encoder 1.
The following process data is available for the encoders:
S Gn_CTW Encoder n control word (n = 1, 2, 3)
S Gn_STW Encoder n status word
S Gn_XACT1 Encoder n actual position value 1
S Gn_XACT2 Encoder n actual position value 2
Note
Encoder 1: Motor encoder
Encoder 2: Direct measuring system
Encoder 3: Additional measuring system
Example of encoder interface
geber_ss_01.vsd
PROFIBUS
Master Slave
G1_CTW
G2_CTW
G1_STW
G2_STW
G1_XACT1
G2_XACT2
G1_XACT2
Fig. 4-10 Example for encoder interface (encoder 1: two actual values, encoder 2: one
actual value)