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8 Safety Function
AC Servomotors/Servo Drives 1S-series with Built-in EtherCAT® Communications User’s Manual (I586)
8-3 STO Function via EtherCAT Communications
8
8-3-2 Operation Example
The STO is also activated if a hardware failure is detected during the self diagnosis. In this case, the
STO remains active until the power is turned OFF.
Precautions for Correct Use
Design programs for the safety controller so that the STO function is not canceled automatically
even when the emergency stop switch is released.
Timing of Return from Safe State
onoff
OperationSwitched on disabled Switched onReady to
switch on
Active
10 ms max.
normal status
STO command at
Servo Drive
Motor power status
STO status at Servo Drive
PDS state
Brake Interlock Output
(Bkir)
Activate STO Reset STO
STO status
Servo ON/OFF
Dynamic brake
Servo OFF
Servo ON
DB released
DB applied
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