Restrictions on CF Card/USB Storage Save
While data is being written to the CF Card/USB storage, changes to parts and screens may be slower.
It may take several seconds to write data, depending on the amount.
After the Status data is read from the display unit, be sure to allow time equal to at least one communication cycle*1 or one Display Scan Time period, *2whichever is longer, before the next command can be written.
Do not call up screens that use the CF Card/USB storage when the CF Card/USB storage is not installed on the display unit. It may not work properly.
If a write error occurs, any file that has not finished loading may remain on the CF Card.
To overwrite and save existing data to the CF Card/USB storage data existing, the CF Card/USB storage must have enough free space to allow the data. If the data is larger than the available space, a write error will occur.
When data is saved to a CF Card/USB storage device and the target folder does not exist, the [\ALARM] folder is created for saving the data. However, if the CF Card cannot be initialized or the folder cannot be created, a read error will occur.
The number of times that data can be written on a CF Card is limited. (Approximately 100,000 times for rewriting 500 KB.)
To format the CF Card/USB storage on your PC, select FAT16 or FAT32. When format to NTFS, the display unit cannot recognize the CF card or USB storage.
Do not connect more than one USB storage device. If you do so, the USB devices may not be recognized properly.
When ejecting a CF Card, make sure that the CF Card access LED lamp turns OFF. Data on the CF Card may be damaged.
When accessing a CF Card, be sure not to power OFF or reset the display unit, or eject the CF Card. Create an application screen on which the CF Card cannot be accessed, and on that application screen, you may power OFF or reset the GP, open and close the CF Card cover, and eject the CF Card.
When inserting a CF Card, check the front and back sides and the connector position of the card. If the CF Card is inserted the wrong way, the data, the CF Card, or the display unit may be damaged.
Use a CF Card manufactured by Digital Electronics Corporation. If a CF Card manufactured by another company is used, the contents of the CF Card may be damaged.
Please make sure to back up all CF Card data.
Please refrain from doing the following, as it can result in damage to data and equipment:
Bending the CF Card
Dropping the CF Card
Spilling water on the card
Touching the CF Card's connectors directly
Disassembling or modifying the CF Card
USB Storage Cautions for Use
While accessing the USB device, do not reset the display unit or remove the USB storage device. Data on USB storage may be damaged.
To remove the USB storage device safely, design the system to remove the device only after turning ON system variable #H_Control_USBDetachTrigger and after confirming #H_Status_USBUsing is OFF.
A.7.2.1 Bit - #H System Variables
Please make sure to back up all data on USB storage devices.
When formatting the USB storage device using FAT16 or FAT32 on a PC, the maximum usable capacity is 2 GB. The display unit cannot use USB storage devices that are FAT16 or FAT32 with greater than 2 GB.
*1 The Communication Cycle Time is the time it takes from when the display unit requests data until the display unit receives data from the device. It is stored in internal device LS2037 in Bin format. The unit is 10 milliseconds.
When using multiple devices/PLCs, you can each the communication cycle time of each device/PLC from the [System Settings] [Peripheral List] page's [List of Device/PLC Management Addresses].5.19.13 Peripheral List Settings Guide
*2 Display Scan Time is the time required to process one screen. It is stored in internal device LS2036 in Bin format. The unit is in milliseconds.