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IM WT1801-01EN
• Data storage may fail under the following circumstances. When this happens, an asterisk appears in the
storage state indication. The storage count includes the missing stored data.
• When you perform consecutive operations in the setup menu.
• When the WT1800 receives consecutive communication commands.
• When you operate the WT1800 over FTP.
• If you choose to store data through USB and the write speed of the connected USB device is slow, a new
numeric data storage operation may begin before the previous operation is finished, and some of the
numeric data may be lost. When this happens, an asterisk appears in the storage state indication. The
storage count includes the missing stored data. You can avoid the loss of numeric data during storage by:
• Setting a longer data update interval.
• Reducing the number of stored data types.
• Using a faster USB memory device.
• When it takes a long time for data to be written to the USB, storage may be stopped forcefully, and some
data may not be saved. When this happens, the storage state indication is “Error.”
• Conversion to ASCII format (.csv) uses a pair of files that consists of a stored numeric data file (.wts) and a
header file (.hds) with the same name. Do not change the names of stored numeric data (.wts) and header
(.hds) files for different sets of data to the same name. If you do so, the WT1800 may malfunction and the
USB memory may be damaged when you convert the data to ASCII format (.csv).
• If you remove the USB memory during storage and the storage state indication is “Error,” the stored data
file may be incomplete or corrupted. If this is the case, you will not be able to convert the data to ASCII
format (.csv). Be sure to remove the USB memory after storage has been reset or has completed (Cmpl).
• When you turn off the WT1800 power, the contents of the internal RAM disk are lost. Save the contents of
the RAM disk to a USB memory device or network drive before you turn off the WT1800.
• Please be aware that the number of times that you can write to USB memory is limited.
Starting, Stopping, and Resetting Storage (STORE START,
STORE STOP, and STORE RESET)
Starting Storage (STORE START)
• When you press STORE START, storage starts under one of the conditions described below, depending on
the storage mode.
• Manual storage mode (Manual)
Storage starts immediately.
• Real-time storage mode (Real Time)
The WT1800 enters into a storage-ready state. Storage starts when the scheduled storage start time is
reached.
• Integration-synchronized storage mode (Integ Sync)
The WT1800 enters into a storage-ready state. Storage starts when integration starts.
• Event-synchronized storage mode (Event)
The WT1800 enters into a storage-ready state. Storage starts when a user-defined event occurs.
• Single-shot storage mode (Single Shot)
Storage starts immediately. Numeric data is stored whenever you press STORE START.
• When storage starts, the STORE START key illuminates, and “Store:Start” appears in the upper left of the
screen.
• When the WT1800 is in a storage-ready state, the STORE START key blinks, and “Store:Ready” appears in
the upper left of the screen.
• After storage is reset, a stored data file (.wts) and header file (.hds) are created when storage starts again.
• When the storage state is “Stop,” you can restart storage. When you restart storage, the stored data continues
to be written to the file from before storage was stopped.
• When the store state is “Cmpl,” you cannot restart storage until you reset it. After you reset storage and then
start it, a new stored data file is created and written to.
17 Data Storage
