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MDS-D2/DH2 Series Instruction Manual
3.3 STO (Safe Torque Off) Function
< Operation sequences example for dedicated wiring STO function >
CAUTION
1. Do not connect a cable to pin 1 and 2 of CN8. A malfunction or failure may result.
2. Input the STO signal during servo OFF.
3. Do not input the external emergency stop signal while the STO signal is input.
POINT
1. For this function which inputs the STO signal directly to the drive unit, safety is ensured by inputting synonymous STO
signals redundantly to shut off the energy supply with the independent control.
2. Diagnosis for the input status of STO signal can be performed by using TOF signal.
SERVO ON
SERVO OFF
ON
ON
STO signal
switching
timing
STO1 signal
STO2 signal
Servo OFF signal
Actual door
operation
Input the STO signal in servo OFF status.
Drive unit detects dual signal warning A4(sub-number 0001)
by the STO signal input (power shutoff) state in servo OFF.
Release
Release
Door close
Door open
(During power shutoff
with ON)
(During power shutoff
with ON)