Siemens SINAMICS S120 Function Manual page 107

Terminals for STO, SS1 (time-controlled), SBC
The functions are separately selected/deselected for each drive using two terminals.
1. Switch-off signal path, Control Unit
2. Switch-off signal path Motor Module/Power Module
Both terminals must be operated simultaneously, otherwise a fault will be issued.
Figure 6-1 Example: Terminals for "Safe Torque Off", example for Motor Modules booksize and CU320-2 DP
Safety Integrated
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
6.2 Control signals by way of terminals on the Control Unit and Motor/Power Module
The desired input terminal is selected via BICO interconnection (BI: p9620[0]).
The input terminal is the "EP" terminal ("Enable Pulses")
The EP terminal is periodically interrogated with a sampling time, which is rounded off to
an integer multiple of the current controller cycle; however, it is a minimum of 1 ms.
(example: t = 400 µs, t
i
=> 3 x t = 1.2 ms)
EP i
Control of the safety functions
107