Siemens SINAMICS G120 Function Manual page 197

Response in the event of a discrepancy
A discrepant signal at a fail-safe input, e.g. caused by a cable break, results in safety
function STO being selected.
The signal characteristics vary depending on whether you use STO via "Basic Safety" or
"Extended Safety".
Discrepancy during Basic Safety
and Extended Safety (when activating both via F-DI and PROFIsafe)
Figure 6-3
After the tolerance time has expired, the inverter signals the discrepancy with fault F01611 or
F30611.
To switch the motor on again, you must proceed as follows:
1. Rectify the discrepancy.
2. Acknowledge the active messages (see Section Acknowledging with a fail-safe signal or
3. Issue an OFF1 command.
4. Switch the motor on again (ON command).
Safety Integrated Function Manual, SINAMICS G120 and G120C
Function Manual, 01/2011, FW 4.4, A5E03052391B AB
Discrepancy for safety function STO (example: Cable break in the channel of processor
P1)
with a power on reset (Page 191)).
Alarms, faults and system messages
6.2 Reaction of the safety functions to faults
195