Siemens SINAMICS S120 Function Manual page 683

● STO via TM54F:
– p9601.0 = 0
– p9601.2 = 0
– p9601.3 = 0
– p9601.6 = 1
● STO via TM54F and onboard terminals:
– p9601.0 = 1
– p9601.2 = 0
– p9601.3 = 0
– p9601.6 = 1
● STO via onboard terminals:
– p9601.0 = 1
Selecting/deselecting "Safe Torque Off"
The following is executed when "Safe Torque Off" is selected:
● Each monitoring channel triggers safe pulse suppression via its switch-off signal path.
● A motor holding brake is closed (if connected and configured).
Deselecting "Safe Torque Off" represents an internal safety acknowledgment. The following
is executed if the cause of the fault has been removed:
● Each monitoring channel cancels safe pulse suppression via its switch-off signal path.
● The Safety requirement "Close motor holding brake" is canceled. A motor holding brake
is closed by the Safe Brake Control (SBC) function (if connected and configured)."
● Any pending STOP F or STOP A commands are canceled (see r9772 / r9872).
● The messages in the fault memory must also be reset using the general acknowledgment
mechanism.
Note
No message during selection/deselection within p9650
If "Safe Torque Off" is selected and deselected through one channel within the time in
p9650, the pulses are suppressed without a message being output.
However, if you want a message to be displayed, then you must reconfigure N01620 as
an alarm or fault using p2118 and p2119.
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Safety Integrated Basic Functions
10.4 Safe Torque Off (STO)
683