Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 102)

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IM 04L31A01-01E
Internal memory size
The size of the internal memory for acquiring display data and event data is 1.2 MB. When
the measured/computed/control data is saved using both display data and event data, 0.9 MB
and 0.3 MB of memory is used for display data and event data, respectively.
Display data Event data
0.9 MB
0.3 MB
Display data
1.2 MB
Event data
When set to display data only When set to event data only When set to display data and event data
CX2000
internal
memory
1 2 3 4
DISP/ ENTER
1.2 MB
Data to be acquired and selecting the acquisition mode of event data
You can select “display data only,” “display data and event data,” or “even data only”
for the items to be acquired (“Data type” in the settings). If “display data and event
data” or “event data only” is selected, you can select the acquisition mode (“Mode” in
the settings) from “Free,” “Trigger,” or “Rotate.” Refer to the following examples to
make the appropriate selection for your application.
• Acquire only the display data at all times
Data to be acquired: Display data only
• Acquire display data in normal cases and acquire event data around the alarm
occurrence when alarms occur
Data to be acquired: Display data and event data.
Acquisition mode: Trigger or rotate
• Acquire event data at all times
Data to be acquired: Event data only. Acquisition mode: Free
• Acquire event data only when alarms occur
Data to be acquired: Event data only. Acquisition mode: Trigger or rotate
Block segmentation during event data acquisition
In the acquisition of event data, the acquisition area in the internal memory can be
divided into blocks (block segmentation). The acquisition operation varies depending
on whether the acquisition area is divided into blocks for each mode. For detailed
information, see “Acquisition Mode of Event Data” in appendix 1, “Supplementary
Explanation of the Acquisition of Display Data/Event Data to the Internal Memory.”
You can select the number of blocks from 2, 4, 8, and 16.
• Manual sampled data
Every time a given key operation is carried out, all measured/computed/control data
(instantaneous values) at that point is acquired to the internal memory. However, this
excludes measurement channels that are skipped and computation channels that are turned
OFF.
• TLOG data (only on models with the computation function option)
All the measured/computed data (instantaneous data) of all channels can be acquired
to the internal memory at the preset interval. However, this excludes measurement
channels that are skipped and computation channels that are turned OFF.
• Report data (only on models with the computation function option)
The average, maximum, minimum, and sum can be computed for the specified
channels at the preset interval, and the result can be acquired to the internal memory.
You can select one hour (hourly report), one day (daily report), one hour/one day
(hourly and daily), one day/one week (daily and weekly reports), or one day/one
month (daily and monthly reports) for the interval.
1.17 Data Storage Function