Toshiba SX 2000 - Manual (Page 165)

Chapt.5 Maintenance and Checking
5.4 Battery Replacement
In the RAM mode operation, the program, DW registers and calendar data are kept
in the RAM backed-up by the battery module (GBT611*AS).
In the ROM mode operation, the program and DW registers are kept in the built-in
Flash ROM and the calendar data are kept in the RAM.
A lithium battery is used, which has little self-discharge and can be used over a wide
temperature range. Therefore, during its period of use, and in paticular when the
non-conducting time is long, it can be used with assurance.
The date of installation of the battery is recorded on the battery cover of CPU.
Under normal use, it is recommended that the battery should be replacecd every 2
years. Check the date of installation and replace using the following, procedure.
There is an LED(BAT) which indicates normal battery voltage on the front of the CPU
module. This is lit when normal. When this LED flashes or is out, the battery comes
into life. Therefore replace the battery within 7days. (It is recommended that the
power supply should not be switched OFF until actual replacement, in order to pro­
tect the program.)
(1) Insert a fait driver in the V
part to press upwards the
battery cover for removal.
(2) Field the tag of the battery
module and pull it towards
yourself.
(3) Flold the tag of a new
battery module.
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Sequence Controller S2T