
Rockwell Automation Publication 2198-UM002E-EN-P - February 2018
253
Kinetix 5700 Safe Torque-off Function
Chapter 9
When one safety input is turned off, the second input must also be turned off,
otherwise a fault is asserted (see
). The fault is asserted even if the
first safety input is turned on again, without the second input transitioning to
the ON state.
Figure 106 - System Operation when Safety Enable Inputs Mismatch Momentarily
Safety Input S1
Safety Input S2
GuardFault
SafeTorqueOffInhibit
Start Inhibited
GuardOKStatus
OK
GuardGateDriveOutputStatus
Torque Disabled
Stop Requested
GuardStopInputStatus
GuardStopRequestsStatus
GuardStopInputFault
No Fault
1 Second
No Fault
Faulted
Not OK
Faulted
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. After the fault reset requirement is satisfied,
an MAFR command in the Logix Designer application must be issued to
reset the GuardStopInputFault.