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Battery Replacement Section 9-1
9-1 Battery Replacement
The CPU Unit contains a CPM2A-BAT01Battery Set that must be replaced
when its effective life has expired. The effective life under normal conditions is
approximately 5 years. The effective life will be reduced at higher tempera-
tures.
A battery error will occur when the voltage of the battery starts to drop, caus-
ing the ERR/ALM indicator to flash, causing SR 25308 to turn ON, and gener-
ating a battery error message readable from Programming Devices. The
battery must be replaced within one week after a battery error is indicated.
!Caution Replace the battery within one week after the first indication that the battery
requires replacement. Always keep a spare Battery Set on hand. It will be
highly unlikely that you will be able to obtain a replacement Battery Set in time
otherwise. If the battery is not replaced in time, the user program and other
data may be lost.
9-2 Battery Life
The built-in battery is used for retaining the status of the HR and DM areas,
the user’s program, and other specified status while power is not being sup-
plied to the CQM1H. The total number of hours that the battery can provide
backup power will vary as shown below, depending on the ambient tempera-
ture and whether or not a Memory Cassette with a clock is installed.
Note 1. Total hours with no current supplied, at an ambient temperature of 55
°C.
2. Total hours with no current supplied, at an ambient temperature of 25
°C.
Note 1. The values in the above graph are reference values.
2. The effective life of the battery is five years. Replace the battery every five
years even if it could be used longer.
Memory Cassette with
clock
Total hours with no current supplied
Guaranteed time
(see note 1)
Actual capacity
(see note 2)
No 11,000 h (Approx. 1 yr.) 43,000 h (Approx. 5 yr.)
Yes 9,700 h (Approx. 1 yr.)
1
2
3
4
5
Total Time with No Current Supplied (in Years)
Memory Cassette
with clock
No Memory Cassette
with clock
Ambient temperature
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