Siemens SINAMICS G120 Function Manual page 204

Alarms, faults and system messages
6.2 Reaction of the safety functions to faults
Response in the event of a discrepancy
If the interface of the SDI function is a fail-safe digital input (F-DI), and a discrepancy signal
is present at this F-DI, e.g. caused by a cable break, then the discrepancy selects safety
function SDI. After the tolerance time has expired, the inverter signals the discrepancy
(alarm C01770 or C30770) but does not switch off the motor.
Figure 6-10
To deselect SDI, you must remove the discrepancy and acknowledge the discrepancy
message (see Section Acknowledging with a fail-safe signal or with a power on reset
(Page 191)).
202
Response of safety function SDI in the event of a discrepancy
Safety Integrated Function Manual, SINAMICS G120 and G120C
Function Manual, 01/2011, FW 4.4, A5E03052391B AB