Siemens SINAMICS S120 Function Manual page 316

Safety Integrated basic functions
9.6 Control via terminals on the Control Unit and the power unit
Terminals for STO, SS1 (time-controlled), SBC
The functions are separately selected/deselected for each drive using two terminals.
● 1. Switch-off signal path (CU310/CU320)
● 2. Switch-off signal path (Motor Module/Power Module/CUA31)
Both terminals must be operated simultaneously, otherwise a fault will be issued.
Figure 9-2 Terminals for "Safe Torque Off", example for Motor Modules Booksize and CU320
Grouping drives (not for CU310)
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 (CU320)
● 2. Switch-off signal path (Motor Module/CUA31)
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)".
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The desired input terminal is selected via BICO interconnection (BI: p9620[0]).
The input terminal is the "EP" ("Enable Pulses") terminal.
By connecting the binector input to the joint input terminal on the drives in one group.
By appropriately connecting-up the terminals for the individual Motor Modules/Power
Modules belonging to the group with CUA31.
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Drive Functions