Yokogawa Value Series FX1000 - Manual (Page 314)

App-1
IM 04L21B01-01EN
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Index
Appendix 1 File Size of Display Data and Event Data
The maximum size of a single display data file or event data file is 8 MB. This section
takes a look at some data recording cases and calculates the approximate sampling time
required to create an 8 MB file for each case. Use this as a guideline for the sampling
time of a single data file.
Sampled Data Size
• Data Size of Display Data and Event Data
Channel Display Data Event Data
Measurement channel 4 bytes/channel 2 bytes/channel
Computation channel 8 bytes/channel 4 bytes/channel
Time data common to all channels is added for each sample.
Time data 8 bytes/sample
• Data Size per Sample
Display Data
(Number of measurement channels×4 bytes) + (number of computation channels×8
bytes) + 8 bytes (time data)
Event Data
(Number of measurement channels×2 bytes) + (number of computation channels×4
bytes) + 8 bytes (time data)
Sampling Time for a Single File (8 MB)
The sampling time for a single file (8 MB) is calculated as follows:
Number of samples × sampling interval.
The number of samples is calculated as follows:
8 MB/(the data size per sample)
Only Display Data
If the display data from the 12 measurement channels and the 24 computation channels
is recorded at the trend interval of 30 min/div and the display data’s sampling interval is
60 seconds:
Number of samples
= 8 MB/(8 bytes + 12 × 4 bytes + 24 × 8 bytes) = Approximately 32,258 samples
Sampling time per file (8 MB)
= 32,258 × 60 seconds = 1,935,480 seconds = Approximately 22 days
Only Event Data
If the event data from the 12 measurement channels and the 24 computation channels is
recorded at the sampling interval of 1 second:
Number of samples
= 8 MB/(8 bytes + 12 × 2 bytes + 24 × 4 bytes) = Approximately 62,500 samples
Sampling time per file (8 MB)
= 62,500 × 1 seconds = 62,500 seconds = Approximately 17 hours
Appendix