Siemens SINAMICS S120 Function Manual page 108

Control of the safety functions
6.2 Control signals by way of terminals on the Control Unit and Motor/Power Module
Grouping drives
To ensure that the function works for more than one drive at the same time, the terminals for
the corresponding drives must be grouped together as follows:
1. Switch-off signal path
2. Switch-off signal path (Motor Module/Power Module with CUA3x)
Note
The grouping must be identical in both monitoring channels.
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 (drive 1 and 2)
and group 2 (drive 3 and 4).
For this purpose, the same grouping for "Safe Torque Off" must be performed on both the
Control Unit and the Motor Modules.
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By connecting the binector input to the joint input terminal on the drives in one group.
By appropriately wiring the terminals for the individual Motor Modules/Power Modules
with CUA31/CUA32 assigned to the group.
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
Safety Integrated