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Replacing User-serviceable Parts Section 12-2
Low Battery Indications The ERR/ALM indicator on the front of the CPU Unit will flash when the bat-
tery is nearly discharged.
When the ERR/ALM indicator flashes, connect the CX-Programmer to the
peripheral port and read the error messages. If a low battery message
appears on the CX-Programmer (see note 1) and the Battery Error Flag
(A402.04) is ON (see note 1), first check whether the battery is properly con-
nected to the CPU Unit. If the battery is properly connected, replace the bat-
tery as soon as possible.
Once a low-battery error has been detected, it will take 5 days before the bat-
tery fails assuming that power has been supplied at lease once a day (see
note 2). Battery failure and the resulting loss of data in RAM can be delayed
by ensuring that the CPU Unit power is not turned OFF until the battery has
been replaced.
Note 1. The PLC Setup must be set to detect a low-battery error (Detect Low Bat-
tery). If this setting has not been made, the BATT LOW error message will
not appear on the CX-Programmer and the Battery Error Flag (A402.04)
will not go ON when the battery fails.
2. The battery will discharge faster at higher temperatures, e.g., 4 days at
40°C and 2 days at 55°C.
Replacement Battery Use the CJ1W-BAT01 Battery Set. Be sure to install a replacement battery
within two years of the production date shown on the battery’s label.
Replacement Procedure Use the following procedure to replace the battery when the previous battery
has become completely discharged. You must complete this procedure within
five minutes after turning OFF the power to the CPU Unit to ensure memory
backup.
Note 1. We recommend replacing the battery with the power OFF to prevent the
CPU Unit’s sensitive internal components from being damaged by static
electricity. The battery can be replaced without turning OFF the power sup-
ply. To do so, always touch a grounded piece of metal to discharge static
electricity from your body before starting the procedure.
2. After replacing the battery, connect the CX-Programmer and clear the bat-
tery error.
ERR/ALM indicator
CJ1W-BAT01
05-07
Production Date
Manufactured in July 2005.
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