Bit Pattern Test - Siemens Sinamics S120 Function Manual

The time delay that is unavoidable due to mechanical switch processes, for example, can be
adapted via parameters. p9850/p9650 specifies the tolerance time within which
selection/deselection of the two monitoring channels must take place to be considered as
"simultaneous".
Note
In order to avoid that faults are incorrectly initiated, on these inputs the tolerance time must
always be set shorter than the shortest time between two switching events (ON/OFF,
OFF/ON).
If the "Safe Torque Off" function is not selected/deselected within the tolerance time, this is
detected by the cross-comparison, and fault F01611 or F30611 (STOP F) is output. In this
case, the pulses have already been canceled as a result of the selection of "Safe Torque
Off" on one channel.
9.8.2

Bit pattern test

Bit pattern test of fail-safe outputs
The inverter 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) to identify faults due to either short or cross circuiting. When you
interconnect a fail-safe input of the inverter with a fail-safe output of a control module, the
inverter responds to these test signals.
Figure 9-4
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
9.8 Control via terminals on the Control Unit and Motor/Power Module
Inverter response to a bit pattern test
Safety Integrated basic functions
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