TSX P57 processors: diagnostics
Changing the RAM memory backup battery on TSX P57
At a Glance
This battery, which is in the TSX PSY … power supply module (See Supply
modules: description, p. 292), ensures that the internal RAM memory of the
processor and the real-time clock are saved in case of a voltage 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.
Illustration
171
TSX P57 processors: diagnostics
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.
Illustration
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.
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TSX P57 processors: diagnostics
How often must
the battery be
changed?
Period of battery backup
The length of time during which the battery ensures backup of the processor’s
internal RAM memory and the real-time clock depends on two factors:
l the percentage of time for which the PLC is switched off and therefore the battery
is being used,
l the ambient temperature when the PLC is switched off.
Summary table:
≤ 30°C
40°C
50°C
60°C
PLC off for 12 hours 5 years
per day
3
years
2 years
1 year
PLC off for 1 hour
per day
5
years
4.5 years 4
years
Ambient temperature when inoperative
Backup time
5 years
Independent saving by the processor
The processors have their own offline independent save function to save the
processor’s internal RAM memory and the real-time clock, which allows the removal
of:
l the battery, the power supply or the TSX P57 processor.
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
173
TSX PSY … supply modules: diagnostics
Back-up battery on TSX PSY ... power supply modules
At a Glance
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 backup 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:
l the percentage of time for which the PLC is switched off and as a result the
battery is being used,
l 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 there are problems, 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 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
315
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