Siemens SINAMICS G120 Function Manual page 95

The tolerance time does not extend the inverter response time. The inverter selects its safety
function as soon as one of the two F-DI signals changes its state from high to low.
Figure 5-1
Filter to suppress short signals
The inverter normally responds immediately to signal changes at its safety-related inputs.
This is not required in the following cases:
● When you interconnect a safety-related input of the inverter with an electromechanical
● Several control modules test their safety-related outputs using bit pattern tests
If the safety-related input signals too many signal changes within a certain time, then the
inverter responds with a fault.
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 04/2014, FW V4.7, A5E34261271B AA
Tolerance regarding discrepancy
sensor, contact bounce may result in signal changes occurring, to which the inverter
responds.
(light/darkness tests) to identify faults due to either short-circuiting or cross circuiting.
When you interconnect a safety-related input of the inverter with a safety-related output of
a control module, the inverter responds to these test signals.
A signal change during a bit pattern test usually lasts:
– On test: 1 ms
– Off test: 4 ms
Commissioning
5.6 Setting basic functions
95