Siemens SINAMICS S150 - Bit Pattern Test

Controlling the safety functions
7.3 Control of "STO" and "SS1" via terminals on the Control Unit and the Motor/Power Module
Safety Integrated
144 Function Manual, 05/2010, A5E03264275A
7.3.1.3 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 (light/darkness tests) to identify faults due to either short circuiting or cross
circuiting. 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.
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Figure 7-6 Converter response to a bit pattern test
Note
If the test impulses lead to unintended triggering of the Safety Integrated Functions, a
filtering (p9651/p9851 SI STO/SBC/SS1 debounce time) of the terminal inputs must be
assigned parameters.
Overview of important parameters
● p0799[0...2] CU inputs/outputs sampling time
● p9650 SI SGE changeover tolerance time (Control Unit)
● p9850 SI SGE changeover tolerance time (Motor Module)