Siemens SINAMICS G120 Function Manual page 171

Independent of the voltage levels available, the inverter sets the evaluation of the discrepant
F-DI into the safe state (=zero) until you acknowledge the inverter using a fail-safe signal or
using a power-on reset.
Case 1: Switching on the motor after a discrepancy
Procedure
To switch the motor on again, proceed as follows:
1. Remove the discrepancy.
2. Acknowledge the internal event.
3. Acknowledge the inverter with the "standard" acknowledge signal.
4. Issue an OFF1 command (ON/OFF1 = 0).
5. Switch on the motor (ON/OFF1 = 1).
You have acknowledged the discrepancy message, and switched on the motor again.
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 04/2014, FW V4.7, A5E34261271B AA
Selected setting
Basic functions via
onboard terminals
Basic functions via
PROFIsafe and
onboard terminals
Extended Functions
via PROFIsafe and
Basic Functions via
onboard terminals
How can the internal event be acknowledged?
F-DI PROFIsafe
Select and deselect ---
STO (F-DI =
1 → 0 → 1)
Select and deselect Select and deselect STO
STO (F-DI = (PROFIsafe control word 1,
1 → 0 → 1) bit 0 = 1 → 0 → 1)
or
Select and deselect SS1
(PROFIsafe control word 1,
bit 1 = 1 → 0 → 1)
or
Fail-safe acknowledgment
(PROFIsafe control word 1,
bit 7 = 0 → 1 → 0)
Select and deselect Select and deselect STO
STO (F-DI = (PROFIsafe control word 1,
1 → 0 → 1) bit 0 = 1 → 0 → 1)
or
Select and deselect SS1
(PROFIsafe control word 1,
bit 1 = 1 → 0 → 1)
or
Fail-safe acknowledgment
(PROFIsafe control word 1,
bit 7 = 0 → 1 → 0)
Operation
6.3 Safe Torque Off (STO)
Alternative
Power on reset
Power on reset
Power on reset
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