File Access Fails; Communication With Peripherals Fails - Mitsubishi Electric MELSEC Q Series User Manual

23.4.4

File access fails

Check the following items.
SD CARD LED is off with the reading/writing target set to
an SD memory card.
CF CARD LED is off with the reading/writing target set to
an CF card.
The SD memory card is write-protected with the writing
target set to an SD memory card.
USB LED is off with the reading/writing target set to a USB
device.
There is no free space in the write target drive.
The user program that uses the write target files is running. Stop the user program that uses the write target files.
A file system error has occurred in an SD memory card, CF
card or a USB Mass Storage Class compatible device.
(1) Diagnostics and restoration of the file system in the drive
Use the FAT format for the file system in following drives:
• SD memory card ("/SD")
• CF card ("/CF")
• USB device ("/USB0")
For diagnostics of the FAT format structure, use the "chkdsk" command.
Be sure to execute the "chkdsk" in a format that starts tasks by the "sp" command from the following tools:
• CW Workbench shell
• Telnet
For specifications of the "chkdsk" command, refer to the manual for VxWorks.
Backup the program files and data before restoring a file system, and write the backup files and data after restoration.
After file restoration, a partial error, i.e. loss of stored files, may occur.
23.4.5

Communication with peripherals fails

Check the following items.
The system in a multiple CPU system is faulty.
Check item
Check item
CHAPTER 23 TROUBLESHOOTING
Corrective action
Insert an SD memory card.
(Re-insert an SD memory card.)
Insert an CF card.
(Re-insert an CF card.)
Cancel the write protection of the SD memory card.
(Refer to the manual for the SD memory card used.)
Install a USB device.
(Re-install a USB device.)
• Allocate a free space in the write target drive.
• Change the write target to another drive.
Restore the file system in the SD memory card, CF card or a
USB Mass Storage Class compatible device.
(Page 405, (1) in this section)
Corrective action
Reset the multiple CPU system and restart it.
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