IAI PSEL, Operation Manual

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Part 3 Positioner Mode
4. Details of Each Output Signal
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Ready (RDY)
This signal will turn ON when the initialization has completed successfully after the main power was input,
and the controller enters the mode where it can control the actuator.
This signal will turn OFF when an error of cold level or higher generates.
Use this signal as a condition to start control on the PLC side.
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Alarm (*ALM)
This signal remains OFF while the controller is normal, and will turn ON if an alarm occurs.
Program the PLC so that it will monitor this signal and implement appropriate safety measures to protect
the entire system when the signal turns ON.
For the details of alarms, refer to the Appendix “PSEL Troubleshooting.”
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Positioning complete (PEND)
This signal indicates that the actuator reached the target position and the positioning has completed.
When a movement command is executed by turning ON the start signal, this signal will turn OFF.
Thereafter, it will turn ON when the position deviation from the target position has entered the in-position
band regardless of whether the start signal is ON or OFF.
Once this signal turns ON, it will not turn OFF even after the position deviation subsequently exceeds the
in-position band.
(Note) Even if the motor is stopped, this signal will remain OFF if a pause signal is input or the servo is
off.
This signal is OFF when the power is input. It will turn ON upon completion of home-return operation (if
the actuator is of incremental specification).
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System battery error
This signal will turn ON when the voltage of the optional system-memory backup battery drops to a
specified level.