IAI America PCON-CFA - Manual (Page 230)

4. SCON-CA
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4.7.11 I/O Signal Controls and Functions
* ON indicates that the applicable bit signal is “1,” while OFF indicates that the bit signal is “0.”
How the I/O signals used in the position/simple direct mode 1, 2, half direct mode 1 to 3 and full direct mode are
controlled, as well as the functions provided by these signals, are explained below. For the I/O signals used in the
remote I/O mode 1 to 3, refer to the operation manual for the controller.
(1) Controller ready (PWR) [PLC input signal]
This signal turns ON when the controller has become ready to perform control following the power on.
„ Function
The PWR signal turns ON when the controller has been initialized successfully and become ready to perform
control following the power on, regardless of the alarm status, servo status or any other condition.
Even when an alarm is present, the PWR signal turns ON as long as the controller is ready.
(2) Emergency stop (EMGS) [PLC input signal]
This signal turns ON when the controller has entered the emergency stop mode.
„ Function
The EMGS signal turns ON when the controller has entered the emergency stop mode (motor drive power has
been cut off). The signal will turn OFF once the emergency stop is cancelled.
(3) Alarm (ALM) [PLC input signal]
This signal turns ON when the controller’s protective circuit (function) has detected an error.
„ Function
The ALM signal turns ON when the controller’s protective circuit (function) has actuated following an error
detection.
When the cause of the alarm is removed and the reset (RES) signal is turned ON, the ALM signal will turn OFF if
the applicable alarm is an operation-reset alarm. (To reset cold-start alarms, the power must be reconnected.)
When an alarm is detected, the status indicator LED (refer to 4.4, “DeviceNet Interface”) on the front panel of the
controller will illuminate in red.
(4) Reset (RES) [PLC output signal]
This signal has two functions. One is to reset controller alarms, and the other is to cancel the remaining travel
while the actuator is paused.
„ Function
[1] Turning the RES signal from OFF to ON after removing the cause of the present alarm will reset the alarm
(ALM) signal. (To reset cold-start alarms, the power must be reconnected.)
[2] Turning the RES signal from OFF to ON while the actuator is paused will cancel the remaining travel.