Bit Pattern Test - Siemens SINUMERIK MC Commissioning Manual

Controlling safety functions integrated in the drive
5.6 Control via terminals on the Control Unit and Motor/Power Module
5.6.6

Bit pattern test

Bit pattern test of failsafe outputs
The converter normally responds immediately to signal changes in its failsafe inputs. This is not
desired in the following case: Several control modules test their failsafe 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 failsafe input of the converter with a failsafe output of a control
module, the converter responds to these test signals.
Figure 5-2
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
● p9651
218
Converter response to a bit pattern test
SI STO/SBC/SS1 debounce time (Control Unit)
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB