Changing the TSX P57/TSX H57 RAM Memory Backup Battery
(Original Document)
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Introduction
This battery located on the TSX PSY... supply module ensures that the processor internal RAM memory and the real-time clock are saved in the event of a power outage. It is delivered in the same packaging as the power supply module and must be installed by the user.
Installing the Battery
Carry out the following steps:
Step
Action
1
Open the access flap on the front of the power supply module.
2
Place the battery in its slot, taking care to respect polarities as marked on the module.
3
Close the access flap.
Changing the battery
The battery can be changed every year as a preventative measure or when the BAT LED is lit.
To do this, use the same procedure as for installation, and carry out the following steps:
Step
Action
1
Open the access flap for the battery.
2
Remove the defective battery from its slot.
3
Put the new battery into place.
4
Close and lock the access flap.
If there is a power outage while the battery is being changed, the processor ensures the RAM memory is saved, as it has its own offline independent save function.
NOTE: So as not to forget to change the battery, you are advised to note the date of the next change in the space provided on the inside of the flap.
How often must the battery be changed?
Period of battery backup
The length of time during which the battery can back up the processor’s internal RAM memory and the real-time clock depends on two factors:
Summary table:
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
Independent saving by the processor
The processors have their own offline independent save function to save the processor internal RAM memory and the real-time clock, which allows the removal of:
The backup time depends on the ambient temperature.
Assuming that the processor was switched on previously, the guaranteed 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