QSHT 5700 Inverter Safe Torque-off Function
Hardwired Safe Torque-off
QuickStick HT User Manual 273
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
When one safety input is turned OFF and the second input is not turned OFF within 100 ms, a
fault is asserted (see Figure 7-4). The fault remains asserted even if either safety input is
turned ON again.
Figure 7-4: System Operation in the Event of STO Inputs Discrepancy (fault case 3)
ATTENTION: The safe torque-off fault is detected upon
demand of the safe torque-off function. After troubleshooting
the STO function or performing maintenance that might
affect the STO function, the STO function must be executed
to verify correct operation.
IMPORTANT The GuardStopInputFault can be reset only if both inputs are
in the OFF-state for more than 1 second. The STO function
must be executed to reset the faults if all the fault conditions
are removed.
24V DC
24V DC
0V DC
0V DC
0
1
0
1
0
1
100 ms
SS_IN_CH0
SS_IN_CH1
GuardStopRequestStatus
SafeTorqueOffFault
GuardStopInputFault
1 Second Discrepancy Limit
No Fault
Faulted
Stop Requested
Faulted
No Fault
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