Siemens SINAMICS Series Function Manual page 48

Controlling the safety functions
5.2 Control of "STO" and "SS1" via terminal module for option K82
Figure 5-3
A switch according to ISO 13850/ EN 418, positive opening according to EC 60947-5-1, or a
certified safety controller must be used as actuating element.
Note
Terminal -X41:10 is permanently connected to the digital input DI 7 of the Control Unit.
48
Circuit Terminal Module for option K82
Safety Integrated
Function Manual, 07/2016, A5E03264275A