Yokogawa DAQWORX Manual do Utilizador descarregar pdf (Página 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 le 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 le 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 les. In that case, necessary les must be saved on a oppydisk.

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 le size of 1 MB cannot be selected depending

on the number of channels.

•

After starting writing, even if the writing is stopped before the specied data length is

reached, the le capacity is taken by the area for the specied 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 le. Setting is done as a percentage of the le 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)

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