Recording method of display data and event data, Types of data to be acquired, Deciding the data to be recorded – Yokogawa Removable Chassis DX1000N User Manual
Page 39: Recording conditions of display data
1-28
IM 04L41B01-01E
Recording Method of Display Data and Event Data
For the setting procedure, see section 6.1.
• Types of Data to Be Acquired
Select display data only, display data and event data, or event data only.
Deciding the Data to Be Recorded
Record the data that suits your application. Refer to the following examples.
Example 1: Continuously record the waveform data as with the conventional chart
recorder.
Record the display data.
Example 2: Record waveform data under normal conditions but record details around
the point of alarm occurrence when alarms occur.
Continuously record display data and record event data when alarms
occur.
Example 3: Only record the most-detailed data at all times.
Record event data by specifying the sampling interval.
Example 4: No need to continuously record data. Record data only when alarms
occur.
Record event data only when alarms occur.
• Internal Memory
The recorded measured data is divided at a specific time interval and saved to files.
If the internal memory is full or if the number of display data files and event data files
exceeds 400, files are overwritten from the oldest file.
• Recording Conditions of Display Data
Item
Description
Source channels
Select from measurement channels and computation channels.
Sampling interval
Specify the sampling interval with the trend interval (see the table
below). You cannot specify a sampling interval that is faster than the
scan interval.
File creation
Files are created at the specified file save interval.
Time
File
File
File
Adding data
Files are also created in the following cases.
• When a file is created manually.
• When the memory sampling is stopped.
• When file creation is executed with the event action function.
• After recovering from a power failure.
Memory start/stop
Press the START key to start recording (memory start) and the
STOP key to stop the recording (memory stop).
Trend interval and the sampling interval of display data
Trend interval
5 s
*1
10 s
*1
15 s
*2
30 s
1 min
Sample rate
125 ms
250 ms
500 ms
1 s
2 s
Trend interval
2 min
5 min
10 min
15 min
20 min
Sample rate
4 s
10 s
20 s
30 s
40 s
Trend interval
30 min
1 h
2 h
4 h
10 h
Sample rate
1 min
2 min
4 min
8 min
20 min
*1 Selectable on the DX1002, DX1002N, DX1004, and DX1004N (release number 3 or later).
*2 Selectable in fast sampling mode on the DX1006, DX1006N, DX1012, and DX1012N (release
number 3 or later).
1.4 Data Storage Function