!
13
Install an EPROM chip onto the memory cassette as shown in the following dia-
gram.
Be sure that the EPROM version set with the switch on the Memory Cassette
agrees with the EPROM version of the installed chip. Refer to the following dia-
gram and table for the location of the switch and its settings.
ON
OFF
EPROM Version Pin 1 Setting Pin 2 Setting
27128 OFF OFF
27256 ON OFF
27512 ON ON
2-1-7 Battery Replacement
CQM1 CPU Units contain a 3G2A9-BAT08 Battery Set, which must be replaced
when its effective life has expired. The effective life under normal conditions is
approximately 5 years. The effective life will be reduced at higher temperatures.
Refer to
Appendix B Battery Service Life
for more details.
A battery error will occur when the voltage of the battery starts to drop, causing
the ALARM/ERROR indicator to flash, causing SR 25308 to turn ON, and gener-
ating a battery error message readable from Programming Devices. The battery
must be replaced within one week after a battery error is indicated.
Caution Replace the battery within one week after the first indication that the battery
requires replacement. Always keep a spare Battery Set on hand. It will be highly
unlikely that you will be able to obtain a replacement Battery Set in time other-
wise. If the battery is not replaced in time, the user program and other data may
be lost.
Use the following procedure to replace the battery. You must complete this pro-
cedure within five minutes after turning off the power to the CQM1 to ensure
memory backup.
1, 2, 3...
1. Turn off the power to the CQM1.
or If the CQM1 is not turned on, turn it on for at least one minute and then turn it
off.
Note If power is not turned on for at least one minute before replacing the
battery, the capacitor that backs up memory when the battery is
CPU Unit Section 2-1
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