Siemens SINAMICS V90 Operating Instructions Manual page 220

Safety Integrated function
8.4 Safety Integrated basic functions
Behaviors of the STO function
Terminal
STO1
High level
Low level
High level
Low level
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).
Note
If "Safe Torque Off" is selected and de-selected through one channel within 2 seconds, the
pulses are suppressed without a message being output.
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.
3. Switch the drive back on.
– 1/0 edge at input signal "ON/OFF1"
– 0/1 edge at input signal "ON/OFF1" (switch on drive)
4. Operate the drives again.
Response time for the "Safe Torque Off" function
The worst response time for the STO function is 5 ms.
220
State
STO2
High level Safe
Low level Safe
Low level Unsafe
High level Unsafe
The servo motor can normally run when you power on the servo
drive.
The servo drive starts up normally but the servo motor cannot
run.
Fault F1611 occurs and servo motor coasts down (OFF2).
Fault F1611 occurs and servo motor coasts down (OFF2).
Operating Instructions, 07/2015, 6SL3298-0AV60-0BP0
Action
SINAMICS V90, SIMOTICS S-1FL6