STO
‑78‑
Figure 6‑3 Return condition of external STO request state
■ When STO_IN (STO1 or STO2 input) is restored to 24 V, the EDM and servo
ready signals are immediately reset to 0. After 400 milliseconds, the servo
operation signal is activated (when STO_IN keeps at 24 V). Servo operation is
PWM drive signal output.
Figure 6‑4 Servo drive reset timing diagram
6.4 Safety Function Response Time
The STO function prevents movement of the motor by two redundant external
hardware signals (STO1 and STO2) that block the PWM signals from being outputted
to the power layer of the servo drive. STO1 and STO2 input signals must be both
active to allow the servo drive to operate normally.
If either one or both signals are set to "Low" level, the PWM signals will be blocked
within 30 ms.
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