Each power supply module has a slot for the installation of a battery which supplies the internal RAM memory of the processors in order to save the data when the PLC is switched off.
This battery is delivered in the same packaging as the power supply module. When inserting it, you must respect the polarities.
NOTE: If a Atrium processor which can be integrated into a PC is being used, the back-up battery is built into the processor and its characteristics are the same as those described below.
Data on the back-up battery
Battery characteristics: thyonile lithium chloride battery, 3.6V/0.8 Ah, 1/2AA size.
Spare part product reference: TSX PLP 01.
Period for which data is stored: the data storage time depends on two factors:
-
the percentage of time for which the PLC is switched off and as a result the battery is being used,
-
the ambient temperature when the PLC is switched off.
Table of the ambient temperatures when switched off:
|
Ambient temperature when inoperative
|
≤ 30°C
|
40°C
|
50°C
|
60°C
|
|
Backup time
|
PLC off for 12 hours per day
|
5 years
|
3 years
|
2 years
|
1 year
|
|
PLC off for 1 hour per day
|
5 years
|
5 years
|
4.5 years
|
4 years
|
Monitoring the battery status: when the power is on, it monitors the status of the battery. If the battery is less than nominal, the user is informed visually by the BAT (red) LED which lights up. If this happens, the battery must be changed immediately. The %S68 system bit gives the status of the backup battery (0 = battery OK).
Changing the battery: the battery can be changed when the power supply module is on, or immediately after switching it off. In the latter case, the time for intervention is limited.
The backup time depends on the ambient temperature. Assuming that the processor was switched on previously, the typical backup time varies in the following way.
|
Ambient temperature when switching off
|
20°C
|
30°C
|
40°C
|
50°C
|
|
Backup time
|
2h
|
45mn
|
20mn
|
8mn
|
