Yokogawa Touch Screen GP20 - Manual (Page 377)

App-1
IM 04L51B01-01EN
Appendix
1
2
3
4
5
App
Appendix 1 File Size of Display Data and Event Data
This section explains how to calculate the file size of display data files and event data files.
The calculation examples are given for the display data only and event data only cases. If
you are recording both display and event data, calculate the data size of each and add them
together. Use the calculated file size as a rough guide.
File Size
A file consists of the following data.
“Information other than the sampled data” + “the sampled data”
The maximum size of a single display data file or event data file when there are no freehand
messages is 20 MB. If a file includes freehand messages, the size is in the range of 24 MB
to 50 MB.
The file size when there are freehand messages is a reference.
Size of Information Other Than the Sampled Data
Item Size (Bytes)
File format identification block 48
File information block 112
Event information block 304
Time zone information block 48
Alarm block 104 + 56 × the number of alarms
Message block 72 + 200 × the number of messages
Batch information block 2360
Display information block 224
Group information block 24 + 264 × the number of groups
Channel information block 24 + 328 × the number of recording channels
Time change information block 280
Measurement data information block 96
Measurement data scan information block 40 + +16 × the number of recording channels
The number of recording channels is the total of all the channels that are recording.
Example 1: When recording data for 30 I/O channels, 10 math channels, 50 communication
channels, and 10 group channels. No messages or alarms.
48 + 112 + 304 + 48 + 104 + 72 + 2360 + 224 + (24 + 264 Ч 10) + (24 + 328 Ч 90) + 280 +
96 + (40 + 16 Ч 90)
= 37,336 bytes
Sampled Data Size
• Data Size of Display Data and Event Data
Channel Display Data Event Data
I/O channel 12 bytes/channel 6 bytes/channel
Math channel 12 bytes/channel 6 bytes/channel
Communication channel 12 bytes/channel 6 bytes/channel
Time data common to all channels is added for each sample.
Time data 16 bytes/sample
Appendix