Siemens SINAMICS S120 Function Manual page 608

Safety Integrated basic functions
10.8 Control via terminals on the Control Unit and Motor/Power Module
Note
Parameterization of the grouping
The grouping must be configured (DI on Control Unit) and wired (EP terminals) identically in
both monitoring channels.
Note
Response of STO for grouping
If a fault in a drive results in a "Safe Torque Off" (STO), this does not automatically mean
that the other drives in the same group also switch to "Safe Torque Off" (STO).
The assignment is checked during the test for the switch-off signal paths. The operator
selects "Safe Torque Off" for each group. The check is drive-specific.
Example: Terminal groups
It must be possible to select/deselect "Safe Torque Off" separately for group 1 (drives 1
and 2) and group 2 (drives 3 and 4).
For this purpose, the same grouping for "Safe Torque Off" must be realized both for the
Control Unit and the Motor Modules.
Figure 10-3 Example: Grouping terminals with Motor Modules Booksize and CU320-2
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Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions