Intro6
Example of a STO timing chart
The Safe Torque Off function allows you to turn off the motor by the opening/closeing of a contact of
an external safety component.
An example of a timing chart using the STO terminal (TB1) is shown below.
Actuator
Example
Electromagnetic lock, safety door switch
Stop/low speed detection unit
STO Input
Servo ON input
Ready return input
Servo status output
Ready output
Opened contact(STO ineffective)
Servo ON Servo OFF Servo ON
Turns off with STO input
Turns ON with ready return input
(contact with external component)
Closed contact(STO effective) Opened contact(STO ineffective)
Use the safe torque off function with the servo off in normal conditions.
Always conduct a risk assesment off of the entire equipment when using the safe torque off function.