Mitsubishi MELSEC-Q Series User Manual page 14

Precautions for battery
Precautions for clock setting
A
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(1) File corruption
(a) When battery is not replaced after battery error occurrence
The standard ROM/battery-backed-up RAM data during access or the clock data
may be corrupted, or a file system error may occur.
(b) When shutdown operation is not performed after running without battery
The standard ROM/battery-backed-up RAM data during access or the clock data
may be corrupted, or a file system error may occur.
(c) When steps shown in Section 5.7.4 are not followed
The standard ROM/battery-backed-up RAM data during access or the clock data
may be corrupted, or a file system error may occur.
(2) Restrictions on running without battery
(a) When having been powered on without battery
When the C Controller module has been powered on without a battery, it will start
up with the clock data uncertain.
Be sure to set the clock data since programs using the event history and/or clock
data cannot operate properly under this condition. (
(b) When having been run without battery
When the C Controller module has been run without a battery, be sure to perform
shutdown operation before powering off the C Controller module. (
5.7.4 (2))
(3) Battery replacement
Always observe the procedures described in the manual when replacing the battery.
( Section 5.7.3 (4))
(1) Clock setting
(a) Setting method
Set the clock of the C Controller module by the operation described in Section 4.9
(4)(a).
If the year exceeds 2100 after the clock setting, the C Controller module can be
used with the clock data of 2100 or later until it is restarted.
At the time of the restart, the year data will be re-set to 2000 - 2099.
(b) Condition for setting
Set the clock of the C Controller module without the QBF_WaitEvent or
QBF_WaitUnitEvent function being executed.
Section 5.7.4)
Section