IAI America SCON-C - Manual (Page 168)

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3. I/O Signal Control and Signal Functions
Caution: To operate the actuator by allowing the controller to communicate with the PLC via I/O signals, be
sure to tilt the mode selector switch on the front panel of the controller to the “AUTO” position.
3.1 Input Signals
The input signals of this controller incorporate an input time constant to prevent malfunction due to chattering,
noise, etc.
(The external forced stop signal (CSTP) and command pulse-train input (PP•/PP, NP•/NP) are excluded.)
Accordingly, each input signal should remain ON for at least 6 ms before the signal is recognized.
3.1.1 Servo-on Signal (SON)
This signal puts the actuator’s servo motor in a ready state.
 The actuator can operate while the SON signal is ON.
While this signal is OFF, the actuator cannot be operated even when the controller power is supplied.
If this signal turns OFF while the actuator is operating, the actuator will decelerate to a stop at the forced stop
torque. After the actuator has stopped, the servo will turn off and the motor will enter a free-run state.
At this time, the function selected by the applicable parameter (dynamic brake, electromagnetic brake or
deviation counter clearing) is implemented.
Dynamic brake
Electromagnetic
brake
Lock
Release
Lock
Release
Input signal
Input signal
Recognized
Not recognized