Omron NX Series Hardware User Manual page 93

Purpose of the Battery Mounting
The battery is used to retain the clock data while the power is not supplied to the CPU Unit. The clock
data is retained by the built-in capacitor whether the battery is mounted or not, but the retention period
depends on the continuous power-ON time of the CPU Unit, as shown below.
Continuous power-
ON time of CPU
*1
Unit
100 hours
8 hour
1 hour
*1. This is equivalent to the time to charge a built-in capacitor in which no electric charge is accumulated.
When you use the clock data for programming, use a battery if you cannot ensure the continuous pow-
er-ON time shown above or the power-OFF time is longer than the above power-ON time.
The following data (other than the clock data) is retained in the built-in non-volatile memory, so they
are not lost even if the battery and built-in capacitor are fully discharged.
• User program
• Set values
• Variables retained during power interruption
• Event logs
Battery Model
The table below shows the model and specifications of the battery that can be used.
Model
CJ1W-BAT01
Battery-related Error Detection and Clock Data Settings
The CPU Unit is shipped with the battery not mounted. However, the Battery-related error detection
is set to Do not use by default.
The behavior of the CPU Unit when a battery-related error is detected depends on whether battery er-
ror detection is used or not used as shown in the table below.
When the battery is mounted, you can set the Battery-related error detection to Use to detect bat-
tery errors.
When the battery is not mounted, you can set the Battery-related error detection to Do not use to
suppress battery errors.
NX-series NX502 CPU Unit Hardware User's Manual (W629)
Retention period
during no power
supply at an ambi-
ent temperature of
40°C
Approx. 10 days
Approx. 8 days
Approx. 7 days
Appearance
3 Configuration Units
Specification
Service life: 5 years
For the battery lifetime, refer to Battery Service
Life and Replacement Period on page 7-7.
The clock information is retained during power in-
terruptions.
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