Siemens SINAMICS G120 Operating Instructions Manual page 237

An adjustable signal filter in the converter suppresses temporary signal changes using bit
pattern test or contact bounce.
Figure 9-35
Note
The filter increases the converter response time. The converter only selects its safety
function after the debounce time has elapsed.
Table 9- 57
Parameter
p9650
p9651
Note
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.
SINAMICS G120C frequency converter
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB
Filter for suppressing temporary signal changes
Parameters for the filters
Description
F-DI changeover tolerance time (factory setting: 500 ms)
Tolerance time to changeover 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.
9.10 Fail-safe function Safe Torque Off (STO)
Functions
235