IAI America ASEL - Manual (Page 4)

CAUTION
Operator Alarm on Low Battery Voltage
This controller is equipped with the following backup batteries for retention of data in the event of power
failure:
[1] System-memory backup battery (optional)
For retention of position data, global variables/flags, error list, strings, etc.
[2] Absolute-encoder backup battery (absolute specification)
For retention of multi-rotation data of the encoder
Since these batteries are not rechargeable, they will be eventually consumed. Unless the batteries are
replaced in a timely manner, the voltage will drop to a level where the data can no longer be retained. If a
power failure occurs in this condition, the data will be lost. (The life of each battery varies depending on
the operating time.)
Once the data is lost, the controller will not operate normally the next time the power is turned on, and
recovery will take time.
To prevent this problem, this controller can output a low battery voltage alarm from its I/O port.
You can specify a desired output port to issue a low voltage alarm for the system-memory backup
battery.
Set “15” as the input function specification value in the I/O parameter corresponding to the output port
number you want to specify.
Setting example)
To specify output port No. 306 to issue a low voltage alarm for the system-memory backup battery, set
“15” in I/O parameter No. 52 as the input function specification value.
You can specify a desired output port to issue a low voltage alarm for the absolute-data backup
battery.
Set “16” as the input function specification value in the I/O parameter corresponding to the output port
number you want to specify.
Setting example)
To specify output port No. 307 to issue a low voltage alarm for the absolute-data backup battery, set
“16” in I/O parameter No. 53 as the input function specification value.
It is recommended that this function be utilized to prevent unnecessary problems resulting from low
battery voltage (consumption of battery life).
In particular, the person in charge of overall system design should utilize this function to provide a design
means for issuing an operator alarm using an output signal from an I/O port, while the person in charge of
electrical design should provide an electrical means for achieving the same effect.
For the battery replacement procedure, refer to the applicable section in the operating manual.
It is recommended that you always back up the latest data to a PC in case of voltage drop in the system-
memory backup battery or unexpected controller failure.