Bit Pattern Test - Siemens SINAMICS S120 Function Manual

Safety Integrated basic functions
10.8 Control via terminals on the Control Unit and Motor/Power Module
10.8.2

Bit pattern test

Bit pattern test of fail-safe outputs
The converter normally responds immediately to signal changes in its fail-safe inputs. This is
not desired in the following case: Several control modules test their fail-safe outputs using bit
pattern tests (on/off tests), in order to identify faults due to either short-circuit or cross-circuit
faults. When you interconnect a fail-safe input of the converter with a fail-safe output of a
control module, the converter responds to these test signals.
Figure 10-4
Note
Debounce time for unwanted triggering of Safety Integrated functions
If the test pulses cause an unwanted triggering of the Safety Integrated functions, these test
pulses can be suppressed with the aid of the F-DI input filter (p9651). To do this, a value
must be entered in p9651 that is greater than the duration of a test pulse.
Overview of important parameters (see SINAMICS S120/S150 List Manual)
• p9651
610
Converter response to a bit pattern test
SI STO/SBC/SS1 debounce time (Control Unit)
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions