Safe Torque Off (Sto) - Extended Function - Siemens SINUMERIK Series Function Manual

● F-DI input filter (p9651)
Setting the debounce time in ms for the fail-safe digital inputs to control STO/SBC/SS1.
● Simultaneity monitoring (p9650)
Sets the discrepancy time in ms for the switchover of the safety-relevant inputs (SGE) on
the Control Unit.
● Delay time STOP F -> STOP A (p9658)
Sets the transition time from STOP F to STOP A in ms on the Control Unit.
● Forced checking procedure of the switch-off signal paths (p9659)
Sets the time interval in hours for carrying out the forced checking procedure and testing
the switch-off signal paths.
● Switch-off signal paths must be tested (r9773.31)
To evaluate whether the switch-off signal paths must be tested, the status of r9773.31
"Switch-off signal path must be tested" can be interconnected with a parameter via the
BICO editor.
For the following parameters, the status symbols indicate the actual state (blue = active; gray
= inactive):
● STO selected (r9772.0)
"STO selected in the drive" setting
● No text (brake reaction) (r9773.2)
Setting "SS1 Delay time active in the drive"
● Pulse inhibit channel 1 active (r9772.1)
Setting "STO or safe pulse cancellation active on the CU"
● Pulse inhibit channel 2 active (r9872.1)
Setting "STO on Motor Module active"
● STO active (r9773.1)
Setting "STO active in the drive"
● Switch-off signal paths must be tested (r9773.31)
Setting "Switch-off signal paths must be tested"
Parameter list
When required, alternatively you can use a parameter list for each setting in this window. You
can access the parameter list (Page 56) using the ">>" softkey followed by the "Parameter list"
softkey.
3.9.3

Safe Torque Off (STO) - extended function

In conjunction with a machine function or in the event of a fault, the "Safe Torque Off" (STO)
function is used to safely disconnect the torque-generating energy supply to the motor.
A restart is prevented by the two-channel pulse suppression. The switching on inhibited
prevents an automatic restart after deselection of STO.
The two-channel pulse cancellation function integrated in the Motor Modules / Power Modules
is a basis for this function.
Safety Integrated
Function Manual, 10/2015, 6FC5397-3EP40-5BA3
Commissioning - drive-based
3.9 Safety Integrated functions
73