Bit Pattern Test - Siemens SINUMERIK 840D sl Function Manual

"Simultaneously" means:
The changeover must have been completed in both monitoring channels within the
parameterized tolerance time.
● p9650 SI SGE changeover tolerance time (Control Unit)
● p9850 SI SGE changeover tolerance time (Motor Module)
Note
To avoid incorrect triggering of fault messages, at these outputs the tolerance time must always
be set to be 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 crosswise data 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 in one channel.
5.6.3

Bit pattern test

Bit pattern test of failsafe outputs
The converter normally responds immediately to signal changes in its failsafe inputs. This is
not desirable 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. If a failsafe input of the converter is interconnected with a failsafe output of a control
module, then the converter responds to these test signals.
Figure 5-4
Note
If the test pulses 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 parameterized.
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
5.6 Control via terminals on the Control Unit and the power unit
Converter response to a bit pattern test
Safety Functions integrated in the drive
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