Siemens SINAMICS G120D Series Operating Instructions Manual page 208

Advanced commissioning
7.8 Safe Torque Off (STO) safety function
Figure 7-44
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 7-45
Parameter
p9650
p9651
Debounce times for standard and safety functions
The debounce time p0724 for "standard" digital inputs has no influence on the fail-safe input
signals. Conversely, the same applies: The F-DI debounce time does not affect the signals
of the "standard" inputs.
If you use an input as a standard input, set the debounce time using parameter p0724 .
If you use an input as a fail-safe input, set the debounce time as described above.
208
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.
Converter with control units CU240D-2
Operating Instructions, 04/2015, FW V4.7.3, A5E34262100B AB