Mitsubishi MELSEC-Q Series User Manual page 187

5
SETTINGS AND PROCEDURES BEFORE OPERATION
(2) Shutdown procedures needed when powering off C Controller system
without battery installed
Be sure to perform shutdown procedures when powering off the C Controller system
without a battery installed in the C Controller module.
If the power is turned off without a battery installed, the saved data, such as the
standard ROM parameter file, event history file, data being processed, user program,
data file, and battery-backed-up RAM data, will be lost.
[Operation procedure]
Predetermine the shutdown request signal (Xm), and design a program for the
following operation using the QBF_X_In_BitEx function, QBF_ShutdownRom
function, and various file access (close) functions (using "Standard ROM shutdown
status" of the QBF_ReadStatusEx function if necessary).
IMPORTANT
1. If the power is switched off without performing the above shutdown procedures when
no battery is installed, the standard ROM and battery-backed-up RAM data may be
corrupted, or a file system error may occur.
When a battery is not installed, be sure to perform shutdown procedures and then
power off the C Controller system.
2. Once the shutdown procedures have been done, always turn off the power or reset
the system.
The C Controller module will not operate normally if it is kept operated without being
powered off or reset.
(3) Sample program
Refer to Section 10.4 for the sample program used for the shutdown operation of the
C Controller module.
1) By an external input, turn the shutdown request (Xm: arbitrarily given) from
OFF to ON.
2) Stop file access to the standard ROM/battery-backed-up RAM/CompactFlash
card, and close the open file.
fclose function to make this operation performed when Xm turns on.)
3) Unmount the CompactFlash card.
4) Shut down the standard ROM.
(Use the QBF_ShutdownRom function.)
5) After making sure that shutdown is completed (the MODE LED is flashing
green), power off the C Controller system.
(To confirm the shutdown complete status from the user program, check the
"MODE LED status" or "Standard ROM shutdown status" of the
QBF_ReadStatusEx function.)
* 1 When no access has been made to the file on the CompactFlash card, closing the file and
unmounting the CompactFlash card is not needed.
5.7 Battery Specifications, Installation and Replacement
5.7.4 When module has been operated without battery
*1
(Use the QBF_X_In_BitEx function and close/
*1
( Section 5.8)
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