Failsafe Digital Input - Siemens SINAMICS G120C Operating Instructions Manual

4.10.6

Failsafe digital input

To enable a safety function via the terminal strip of the converter, you need a failsafe digital
input.
Which devices are you allowed to connect?
The failsafe digital input is designed for the following devices:
• Connection of safety sensors, e.g. emergency stop command devices or light curtains.
• Connection of pre-processing devices, e.g. failsafe control systems and safety relays.
Signal state
The converter expects signals with the same state at its failsafe digital input:
• High signal: The safety function is deselected.
• Low signal: The safety function is selected.
Connecting P/P and P/M-switching fail-safe digital outputs
It is permissible to connect PP and PM-switching safe outputs to a fail-safe digital input.
Fault detection
The converter compares the two signals of the failsafe digital input. The converter thus detects,
for example the following faults:
• Cable break
• Defective sensor
The converter cannot detect the following faults:
• Cross-circuit of the two cables
• Short-circuit between signal cable and 24 V power supply
SINAMICS G120C Converters
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
For specific default settings of the terminal strip, e.g. default
setting 2, the converter combines two digital inputs to form
one failsafe digital input FDI 0.
PP-switching digital output
4.10 Connecting the interfaces for the converter control
PM-switching digital output
Installing
101