Setting/Removal Of Compactflash Card And Precautions For Use; Precautions For Using Compactflash Card - Mitsubishi Electric MELSEC Q Series User Manual

4 SET-UP AND PROCEDURE BEFORE OPERATION

4.9 Setting/Removal of CompactFlash Card and Precautions for Use

4.9.1 Precautions for using CompactFlash card

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This section describes how to set or remove the CompactFlash card and precautions
for use.
This section explains precautions for use of the CompactFlash card.
(1) Precautions for available CompactFlash cards
Use a CompactFlash card listed in Section 2.4. (Refer to Section 2.4.)
Failure to do so may cause a problem such as data corruption in the
CompactFlash card and system stop.
(2) Precautions for when powering off the system or resetting the CPU
module
When the system is powered off or the CPU module is reset during writing to the
CompactFlash card, the write processing may not be completed.
In this case, the Web server module can normally be powered off without file
access stop because it automatically restores the files when powered on again.
In rare cases, however, the module cannot completely restore files.
If a problem arises by this, perform file access stop processing before powering
off the system or resetting the CPU module.
Also, regularly backing up important data (e.g. save on other media) is
recommended. (Refer to Section 4.9.2 (1).)
(3) Precautions for removal or replacement of CompactFlash card
(a) Be sure to stop file access before removing or replacing the CompactFlash
card. (Refer to Section 4.9.2)
(b) Failure to observe the procedures indicated in Section 4.9.2 may result in
erasure of logging data during processing, corruption of data in the
CompactFlash card during access, or a file system fault.
(c) If a CompactFlash card fault has occurred, refer to Section 9.1 (9) and restore
the card.
(4) Precautions on diagnostic time of CompactFlash card
(a) The Web server module executes diagnosis (including file restoration) of the
CompactFlash card when:
1) Power is turned OFF and ON, or the CPU module is reset.
2) The CompactFlash card is inserted while the power is ON.
(b) The diagnostic time of the CompactFlash card is lengthened if many files are
stored in the card.
It takes approx. 5 seconds for 100 files, and approx. 10 seconds for 1000 files.
(c) Since the following times may be lengthened due to too many files, delete
unnecessary files.
1) Rising time of the CompactFlash card setting status. (X1)
2) Web server module's ready time. (Rising time of the Module READY (X0))
MELSEC-Q
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