Siemens SINAMICS S120 Function Manual page 369

Enabling the "Safe Torque Off" (STO) function
NOTICE
It is not possible to activate the function via TM54F and PROFIsafe at the same time. It is
however possible to use the onboard terminals (Control Unit and power units, see section
"Control via terminals on the Control Unit and the power unit") and the terminals on the
TM54F and the PROFIsafe control function at the same time.
The "Safe Torque Off" function is enabled via the following parameters:
● STO via terminals:
● STO via TM54F (only with "Extended Functions" option):
● STO via PROFIsafe (only with "Extended Functions" option):
Selecting/deselecting "Safe Torque Off"
The following occurs when "Safe Torque Off" is selected:
● Each monitoring channel triggers safe pulse suppression via its switch-off signal path.
● A motor holding brake is applied (if connected and configured).
The following occurs when "Safe Torque Off" is de-selected:
● Each monitoring channel cancels safe pulse suppression via its switch-off signal path.
● The safety prompt "Apply motor holding brake" is canceled.
● Any pending STOP F or STOP A commands are canceled (see r9772/r9872).
Restart after the "Safe Torque Off" function has been selected
1. Deselect the function in each monitoring channel via the input terminals.
2. Issue drive enable signals.
Drive functions
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
– p9601.0 = 1, p9801.0 = 1
– p9601.2 = 1, p9801.2 = 1
– p9601.3 = 0, p9801.3 = 0
– p9601.2 = 1, p9801.2 = 1
– p9601.3 = 1, p9801.3 = 1
Note
If "Safe Torque Off" is de-selected and selected again through one channel within the
time in p9650/p9850, the pulses are canceled but a signal is not output.
If you want a message to be displayed in this case, however, you have to reconfigure
N01620/N30620 via p2118 and p2119 as an alarm or fault.
Safety Integrated basic functions
9.3 Safe Torque Off (STO)
369