Forcibly Disabling The Sd Memory Card - Mitsubishi Electric Q26UD(E)HCPU User Manual

10.4

Forcibly Disabling the SD Memory Card

The SD memory card can be disabled before the CPU module is powered off regardless of the status of SD604
(Memory card use conditions).
(1) How to disable the SD memory card forcibly
1.
Turn on SM606 (SD memory card forced disable instruction). The SD memory card inserted to the
CPU module is disabled regardless of the status of SD604 (Memory card use conditions).
Check the SD memory card disabled status in SM607 (SD memory card forced disable status flag).
2.
The SD CARD LED turns off.
(2) How to enable the disabled SD memory card
The SD memory card forcibly disabled status can be canceled by the following operations.
• Powering off and then on the CPU module
• Resetting the CPU module
• Turning off SM606 (SD memory card forced disable instruction)
*1 The status of SM606 (SD memory card forced disable instruction) cannot be changed until SM607 (SD memory card
forced disable status flag) turns on after SM606 is turned on.
(SM606 status is valid.)
SM606
(SD memory card
forced disable instruction)
SM607
(SD memory card forced
disable status flag)
(3) Precautions
• When the SD memory card is accessed after it has been disabled forcibly, the CPU module operates in the
same way when the SD memory card is not inserted. Note, however, that no processing is performed when
the SD memory card is accessed by the FREAD, FWRITE, COMRD(P), or QCDSET(P) instruction.
• When SM606 (SD memory card forced disable instruction) is on and an SD memory card is inserted, turning
off SM606 can enables the SD memory card.
• If the SD memory card is forcibly disabled while a file is written from an external device to the card, the
writing may fail. Cancel the SD memory card disabled status and try the writing again.
Forced disable
instruction by on status
ON
OFF
OFF
*1
(SM606 status is invalid.)
ON
CHAPTER 10 SD MEMORY CARD
(SM606 status is valid.)
Forced enable
instruction by off status
ON
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