Siemens SINAMICS G120C Operating Instructions Manual page 273

If the safety-related input signals too many signal changes within a certain time, then the
inverter responds with a fault.
Figure 6-58
An adjustable signal filter in the inverter suppresses temporary signal changes using bit
pattern test or contact bounce.
The filter increases the inverter response time. The inverter only selects its safety function
after the debounce time has elapsed.
Figure 6-59
Parameter
p9650
p9651
SINAMICS G120C converter
Operating Instructions, 07/2015, FW V4.7 SP3, A5E34263257B AC
Inverter response to a bit pattern test
Filter for suppressing temporary signal changes
Description
F-DI changeover tolerance time (factory setting: 500 ms)
Tolerance time to change over the fail-safe digital input for the basic functions.
STO debounce time (factory setting: 1 ms)
Debounce time of the fail-safe digital input for the basic functions.
Advanced commissioning
6.8 Safe Torque Off (STO) safety function
269