Siemens SINAMICS G120 Function Manual page 60

Installing
4.3 Activation via F-DI
Activating several inverters simultaneously
You may activate the safety functions of several converters simultaneously with one or
several series-connected safety sensors.
If there is a risk of cross-circuits or short-circuits, the cables between the sensor and the
converter must be protected, for example, by routing them in a steel tube.
The converter provides the supply voltage
Connect the 24 V supply of the converter to the sensors and connect the reference
potentials of the inputs used to GND.
Figure 4-12
60
Simultaneous activation of several converters with converter power supply
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 04/2014, FW V4.7, A5E34261271B AA