Siemens Sinamics S110 Function Manual page 323

Acknowledging the safety faults
General
NOTICE
Safety faults can also be acknowledged (as with all other faults) by switching the drive unit
off and then on again (POWER ON).
If this action has not eliminated the fault cause, the fault is displayed again after power up..
Acknowledgment via PROFIsafe
The higher-level controller sets the signal "Internal Event ACK" via the PROFIsafe telegram
(STW bit 7). A falling edge in this signal resets the status "Internal Event" and so
acknowledges the fault.
Acknowledgment via F-DI
If the signal "Internal Event ACK" is connected with an F-DI, a falling edge in this signal
resets the status "Internal Event" and so acknowledges the fault. For safety reasons, the
external signal on the F-DI with the function "Internal Event ACK" may not be kept
continuously on the "1" level or for acknowledgment it must first be set from the idle state "0"
to "1" and then set back to "0" once more.
Description of faults and alarms
Note
The faults and alarms for SINAMICS Safety Integrated are described in the following
documentation:
References: SINAMICS S110 List Manual
Drive functions
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
Safety Integrated Functions
8.5 Extended Functions
323