Siemens SINAMICS G220 - Page 662

Description of function
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Figure14-225 Flow diagram STO
Action Motor/converter response
① Selection of STO
• The converter detects selection of STO and signals the status
"STO active" (r9722.0).
• The converter interrupts the torque-generating energy feed to
the motor.
• If you use a line contactor, the converter opens the line contac‐
tor.
• The "switching on inhibited" status prevents the motor from
restarting automatically.
② Coast down
• The motor coasts down to a standstill.
③ Deselection of STO
• The converter detects deselection of STO.
④ Signal change at ON/OFF1
from 1 to 0
• The converter is ready to start again.
⑤ Signal change at ON/OFF1
from 0 to 1
• The motor starts again.
Example
Applications include all machines and systems with moving axes (for example, conveyor
technology, handling).
With STO, maintenance work on the machine with an open protective door is possible, for
example. An EMERGENCY STOP with electromechanical disconnection is not required.
Parameters
The following list contains the parameters of the "Safe Torque O󹪜 (STO)" function.
Number Name Unit
p9603.0...1 SI control 
p9604.0...30 SI enable 
Functions
14.12Safety Integrated
SINAMICS G220 converter
660 Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB