WindO/I-NV4 User’s Manual 31-21
1 External Memory Devices
31
External Memory Devices
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 an SD
memory card and HMI Special Data Register LSD33 for a USB flash drive are set with the error status. For details
about the error, refer to Chapter 33 “HMI Special Data Register (LSD)” on page 33-7. 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, an external memory card reader 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.
SD memory card: After setting HMI Special Relay LSM20 to 1, check that HMI Special Relay LSM21 is 0.
USB flash drive: After setting HMI Special Relay LSM18 to 1, check that HMI Special Relay LSM19 is 0.
SD memory card: This SD memory card not available.
USB flash drive: This USB isn't available.
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