E1 Series Servo Drive User Manual Safety Function
12-4 HIWIN MIKROSYSTEM CORP.
12.2.3 Resetting STO state
When S-ON signal is OFF, power is not supplied to servo motor. If SF1 and SF2 signals are OFF, the
servo drive is in STO state. In STO state, after SF1 and SF2 signals are ON, the servo drive is in D-RDY
state. After S-ON signal is ON, the servo drive is in S-RDY state.
Figure12.2.3.1
If S-ON signal is ON when SF1 and SF2 signals are OFF, STO remains even when SF1 and SF2 signals
are ON afterwards. Once S-ON signal is OFF, the servo drive goes into D-RDY state. After S-ON signal is
input again, the servo drive goes into S-RDY state.
Figure12.2.3.2
Note:
While using STO function, do not set servo on input (S-ON) signal to be always active (Pt50A = t.☐☐☐A).
Otherwise, STO state cannot be reset.
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