4.4.2 Response to a discrepancy when STO is active
If there is a discrepancy between the two digital inputs of an F-DI, the converter ignores the
signals via the fail-safe digital input and transitions to the safe STO state.
Drive response
The converter sets the bit "Internal event" after the discrepancy time has elapsed. You cannot
switch on the motor as long as this signal is active.
Note
Discrepancy time
To avoid incorrectly triggered fault messages, the selected discrepancy time in p9650 must
always be shorter than the shortest time between 2 switching events at these inputs (ON/OFF,
OFF/ON).
The converter indicates the discrepancy error when the RDY-LED flashes quickly red.
● The converter outputs a fault message on the numerical display. It signals the fault via the
web server and vie PROFIsafe
– "Discrepancy (fault F01611 or F30611 "Defect in a monitoring channel" with fault values
r0949 = 2000 or 2002)"
● The converter sets the error bit of the safety functions (= internal event).
Communication telegrams (Page 737) and Bit assignments of the process data
(Page 740)
Independent of the voltage levels present, the converter remains in the STO state until you
have acknowledged the "Internal event" state.
Switching the motor on again
Proceed as follows in order to switch on the motor again:
Acknowledging an internal event
Remove the cause of the internal event (e.g. wire break). You have the following options to
acknowledge the signal:
● Via PROFIsafe
– Selecting and deselecting STO
– Select and deselect SS1
– Fail-safe acknowledgment
Communication telegrams (Page 737)and Bit assignments of the process data
(Page 740)
● Select and deselect STO via the fail-safe digital input
● Switch-on the motor again by
Safety functions integrated in the drive
4.4 Responses to safety faults
SINAMICS S210 servo drive system
Operating Instructions, 12/2017, A5E41702836B AA 71
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