1 External Memory Devices
31-18 WindO/I-NV4 User’s Manual
1.9 Precautions
• For projects that use external memory devices, always insert the external memory device before turning the
MICRO/I on.
• The maximum number of screenshots that can be captured can be set in HMI Special Data Register LSD65.
• External memory devices have a limitation on the number of writes allowed.
Regularly backup data on the external memory device.
• Never turn the power off to the MICRO/I or remove the external memory device while reading/writing to it.
Otherwise, the data on the external memory device may be destroyed. Should this occur, reformat the external
memory device.
• When external memory device is inserted into the MICRO/I, first perform the following operations, and then turn
off the power to the MICRO/I or remove the external memory device.
• When a read or write failure occurs with the external memory device, HMI Special Data Register LSD42 for a USB
flash drive
*1
inserted in USB1 or an SD memory card
*2
and HMI Special Data Register LSD33 for a USB flash
drive
*3
are set with the error status. For details about the error, refer to Chapter 33 “HMI Special Data Register
(LSD)” on page 33-8. Manually delete the files by using a computer or the File Manager function.
• If an unusable external memory device is inserted, the following error message appears.
• If your computer does not have an SD memory card slot, a docking station is required to read/write to the SD
memory card.
• Multiple USB flash drives cannot be used at the same time.
• Do not connect the USB flash drive to the MICRO/I through a USB hub.
• The message “Stopping external memory” appears while reading or until writing stops.
To resume reading or writing to the external memory device, re-insert it.
• Altering folders and files in the External Memory Device folder on the external memory device will make the
external memory device unusable in MICRO/I and WindO/I-NV4.
*1 HG2J-7U only
*2 HG5G/4G/3G/2G-V, HG4G/3G, HG2G-5F only
*3 HG2G-5T, HG1G/1P only
Model External Memory Device Operation
HG2J-7U
USB flash drive inserted in USB1
After setting the value of the HMI Special Relay LSM20 to 1,
check that the value of the HMI Special Relay LSM21 is 0.
USB flash drive inserted in USB2
After setting the value of the HMI Special Relay LSM18 to 1,
check that the value of the HMI Special Relay LSM19 is 0.
HG5G/4G/3G/2G-V,
HG4G/3G, HG2G-5F
SD memory card
After setting the value of the HMI Special Relay LSM20 to 1,
check that the value of the HMI Special Relay LSM21 is 0.
USB flash drive
After setting the value of the HMI Special Relay LSM18 to 1,
check that the value of the HMI Special Relay LSM19 is 0.
HG2G-5F, HG1G/1P USB flash drive
After setting the value of the HMI Special Relay LSM18 to 1,
check that the value of the HMI Special Relay LSM19 is 0.
SD memory card:
This SD memory card not available.
*2
USB flash drive:
This USB flash drive isn't available (USB1)
*1
This USB flash drive isn't available (USB2)
*1
This USB isn't available.
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