7 Maintenance and Inspection
7-6
CP1E CPU Unit Hardware User’s Manual(W479)
The ERR/ALM indicator on the front of the CPU Unit will flash when the Battery is nearly discharged.
When the ERR/ALM indicator flashes, connect the CX-Programmer to the peripheral USB port and
read the error messages.
If a low Battery message appears on the CX-Programmer or the Battery Error Flag (A402.04) is ON,
first check whether the Battery is properly connected to the CPU.
If the Battery is properly connected, replace the Battery as soon as possible.
Once a low battery error has been detected, it will take 5 days (at an ambient temperature of 25°C)
before the Battery fails assuming that power has been supplied at least once a day.
You can prevent loosing data in the RAM by ensuring that the CPU Unit power is not turned OFF until
the Battery is replaced.
Precautions for Correct Use
• The Battery Error Flag (A402.04) will turn ON only if the Detect Low Battery parameter in the
PLC Setup has been set to detect a low-Battery error.
If this setting has not been made, Battery errors will not be detected.
• The Battery will discharge faster at higher temperatures, e.g., 4 days at 40°C and 2 days at
55°C.
z Replacement Battery
Name: Battery Set
Model: CP1W-BAT01
Precautions for Correct Use
Be sure to install a replacement Battery within two years of the production date shown on the
Battery’s label.
Low Battery Indications
CP1W-BAT01
09-03
Manufactured in March 2009.
Production Date
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