Input/output signal

Normal open and normal close
  • Normal Open
    Normal open refers to a contact that is open in the normal state and closes when operated. ON when current flows through the switch. It operates conversely to normal close.

  • Normal Close
  • Normal close refers to a contact that is closed in normal state and opens when operated. ON when current does not flow through the switch. It operates conversely to normal open.(Allows you to avoid risks due to cable breakage)

Servo interface:Output
  • CW/CCW (command pulse)
    There are various commanding methods you can use for the command pulse such as the CW/CCW pulse method and the pulse/direction method.The command pulse output format of the motion controller and the command pulse input format of the motor driver must be the same.
  • SVON(ServoON)
    This signal turns on the servo motor control.
  • SVRST (Servo reset)
    This signal resets a servo driver. 
  • SVCTRCL (Servo error counter clear)
    This signal clears the error counter within the servo driver (ex. accumulated pulse counter and error pulse counter).
    The purpose of the servo driver is to bring down the deviation between the command pulse and the encoder FB (feedback) to zero. However, in actual operation, a motor does not start in synchronization with the command pulse but operates by following the command pulse with some delay. Because of this, the motor does not stop immediately even when the command pulse stops and continues to operate until the error counter becomes zero.
    When it is necessary to “quick-stop” a motor (e.g, because it is stopped by an external signal such as a homing signal), SVCRCL needs to be issued on command pulse output completion to clear the error counter within the servo driver and stop the motor.

Servo interface:Input
  • SVALM (Servo alarm)
    This signal warns that the servo driver is out-of-control for some reason, such as overload.
    The operation is stopped while SVALM is output from the servo driver.
  • INPOS (In-position, homing complete, COIN)
    This signal notifies that the servo motor has reached the commanded position. The INPOS signal is issued by the servo driver when the value of the error counter in the servo driver is within the in-position range set in the servo driver.
  • SVRDY (Servo ready)
    In general, this signal is output from the servo driver when the servo driver main power supply is ON while the servo alarm is not.
  • Encoder FB (Encoder feedback)
    This signal is the feedback signal from the encoder. The motion controller counts the phase difference between phase-A and phase-B signals to determine the current carriage position. The phase-Z (phase-C) signal is a signal that is output at every full rotation of the encoder. It is used as a reference position of other operations such as homing.
    In general, phase-A, phase-B, and phase-Z are input to the motion controller through the motor driver.
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