4.10.6 Failsafe digital input
To enable a safety function via the terminal strip of the converter, you need a failsafe digital
input.
For specic default settings of the terminal strip, e.g. default
setting2, the converter combines two digital inputs to form
one failsafe digital input FDI0.
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
PP-switching digital output
PM-switching digital output
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
Installing
4.10Connecting the interfaces for the converter control
SINAMICS G120C Converters
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK 101
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