Siemens SINAMICS G120 Function Manual page 224

Operation
6.8 Safe Direction (SDI)
Switching the motor on after an internal event
Procedure
To switch the motor on after an internal event while SDI is active, proceed as follows:
1. Deselect the SDI function.
2. Issue an OFF1 command (ON/OFF1 = 0).
3. Acknowledge the internal event in one of the following ways:
– Fail-safe acknowledgment using PROFIsafe control word 0, bit 7 = 0 → 1 → 0
– Fail-safe acknowledge signal via a safety input: F-DI = 0 → 1 → 0.
– Select the STO function and deselect again (PROFIsafe control word 0, bit 0 or F-DI).
– Select the SS1 function and deselect again (PROFIsafe control word 0, bit 1 or F-DI).
– Switch off the inverter supply voltage and on again (power on reset).
4. Acknowledge the inverter with the "standard" acknowledge signal.
5. Switch on the motor (ON/OFF1 = 1).
You have acknowledged the internal event and switched on the motor again.
224
1 → 0 → 1).
1 → 0 → 1).
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 04/2014, FW V4.7, A5E34261271B AA