You have interconnected the "STO active" checkback signal. After STO has been selected,
the inverter signals "STO active" to the higher-level control.
Parameter
Description
r9773.01
1 signal: STO is active in the drive
Advanced commissioning
6.15 Safe Torque Off (STO) safety function
SINAMICS G120C converter
222
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF