11
MAINTENANCE AND INSPECTION
11.3 Battery Life and Replacement Procedure
11.3.2 Battery lives of CPU modules
11 - 21
9
EMC AND LOW
VOLTAGE
DIRECTIVES
10
LOADING AND
INSTALLATION
11
MAINTENANCE AND
INSPECTION
12
TROUBLESHOOTING APPENDICES INDEX
* 1: For the amount of battery consumption Section 11.3.1.
* 2: The power-on time ratio indicates the ratio of programmable controller power-on time to one day
(24 hours).
(When the total power-on time is 12 hours and the total power-off time is 12 hours, the power-on
time ratio is 50%.)
* 3: The guaranteed battery service life; equivalent to the total power failure time that is calculated
based on the characteristics value of the memory (SRAM) supplied by the manufacturer and
under the storage ambient temperature range of -25 to 75 (operating ambient temperature of 0
to 55 ).
* 4: The actual battery service life; equivalent to the total power failure time that is calculated based on
the measured value and under the storage ambient temperature of 40 . This value is intended
for reference only, as it varies with characteristics of the memory.
* 5: In the following status, the backup time after power OFF is 3 minutes.
•The battery connector is disconnected.
•The lead wire of the battery is broken.
POINT
1. Do not use the battery exceeding its guaranteed life.
2. When the battery hours (total power failure time) may exceed its guaranteed
value, take the following measure.
• Perform ROM operation to protect a program even if the battery dies at
the programmable controller power-OFF.
• Back up programs and data after SM52 turns on (within the backup time
after alarm occurrence).
3. When the battery (Q6BAT, Q7BAT and Q8BAT) is not connected to the CPU
module, its service life is five years.
4. When the battery-low special relay SM52 turns on, immediately change the
battery.
Even if the alarm has not yet occurred, it is recommended to replace the
battery periodically according to the operating condition.
To Next Page
Loading...
Need help?
General
