CAUTION
Operator Alarm on Low Battery Voltage
This controller can be equipped with the following optional 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-data backup battery (absolute encoder specification)
For retention of encoder rotation data.
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 voltage-low warning 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 voltage-low warning for the system-memory backup battery,
set “15” in I/O parameter No. 52.
You can specify a desired output port to issue a voltage-low warning 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 voltage-low warning for the absolute-data backup battery, set
“16” in I/O parameter No. 53.
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 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 backup the latest data to a PC in case of voltage drop in the system-memory
battery or unexpected controller failure.
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