Yokogawa DAQWORX - Manual (Page 87)

4-40 IM WX102-01E
Built-in RAM Disk Usage (WRITE MEMORY)
• Select the built-in RAM disk usage from the following:
• LENGTH: Determines file capacity by specifying the number of data items per ch.
• DIV2, DIV4, DIV8, or DIV16: Use the RAM disk by dividing the disk area into 2, 4, 8
or 16 parts. If the memory capacity is 4 MB, 2 cannot be used.
• If a file is saved in the built-in RAM disk, the usage of the built-in RAM disk cannot be
changed. For this purpose, initialize the RAM disk or change the setting after deleting
all the files. In that case, necessary files must be saved on a floppydisk.
Writing Data Length (WRITE LENGTH)
• If WRITE MEMORY is set to LENGTH, set the number of data items to be written per
channel, selecting from the following: 10, 20, 30, 40, 50, 100, 200, 300, 400, 500, 1k,
2k, 3k, 4k, 5k, 10k, 20k, 30k, 40k, 50k, or 100k
• However, a data length exceeding a file size of 1 MB cannot be selected depending
on the number of channels.
• After starting writing, even if the writing is stopped before the specified data length is
reached, the file capacity is taken by the area for the specified data length.
Note
When using the computation channel, do not write measured/computed data in an application
where the measurement interval is shorter than 0.5 sec, the writing interval is set to INTVL, or
the data length is shorter than 50, if:
• the writing action is in the REPEAT mode.
• writing starts using the event/action mode.
Pretrigger (WRITE PRETRIG)
• If WRITE TRIG is set to TRIGGER, the data before the trigger (event) generation can
be saved in part of the set file. Setting is done as a percentage of the file capacity in
10% increments.
Trigger (event)
20%
File capacity (100%)
Data before
trigger was
generated
• If a pretrigger is used (except 0%), it is necessary to set the writing start trigger
(WR_TRIG) to the action in the event/action function.
Data Format
The measured/computed data are saved in the binary format.
Data Capacity
The data capacity is determined by the following formula:
Measured data: 2 bytes/data item; Computed data: 4 bytes/data item.
• Stand-alone model: Header 256 + 64 x (number of measuring channels + number
of computing channels) bytes. Data capacity = 256 + 64 x (number of measuring
channels + number of computing channels) + (number of measuring channels x 2 +
number of computing channels x 4 + 6) x data length.
• Expandable model: Header 576 + 64 x (number of measuring channels + number
of computing channels) bytes. Data capacity = 576 + 64 x (number of measuring
channels + number of computing channels) + (number of measuring channels x 2 +
number of computing channels x 4 + 6) x data length.
4.18 Setting the Writing Operation (DC100 Only)