5 Functional Mechanisms of this Application
5.1 Functionality of process data exchange
SINAMICS G120 DP at S7-1200
Entry-ID: 70155469, V1.4, 07/2018
Siemens AG 2018 All rights reserved
5.1.4 Control word (STW1) and status word (ZSW1)
Control and status word are predefined. They are exchanged in all message frame
types in the first respective process data word (PDZ01).
Figure 5-3: STW1
A control word for which all bits are 0 is rejected as invalid by the SINAMICS
converter. Therefore, at least bit 10 must always be set.
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