3 Configuration Units
3 - 16
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
The battery is not mounted when the product is shipped.
To turn OFF the power supply to the equipment for a certain period of time by using the clock data for
programming, event logs, etc., you need a separately-sold battery to retain the clock data.
The following describes the purpose of the battery mounting, the battery model, and the battery-related
error detection and clock data settings.
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.
When you use the clock data for programming, use a battery if you cannot ensure the continuous
power-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
The table below shows the model and specifications of the battery that can be used.
3-1-5 Battery
Purpose of the Battery Mounting
Continuous power-ON time of
CPU Unit
*1
*1. This is equivalent to the time to charge a built-in capacitor in which
no electric charge is accumulated.
Retention period during no
power supply at an ambient
temperature of 40°C
100 hours Approx. 10 days
8 hours Approx. 8 days
1 hour Approx. 7 days
Battery Model
Model Appearance Specification
CJ1W-BAT01 Service life: 5 years
For the battery lifetime, refer to Battery Service
Life and Replacement Period on page 7-6.
The clock information is retained during power
interruptions.
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