Yokogawa DAQWORX - Manual (Page 65)

2-45 IM WX101-01E
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Index
Configuring the DAQLOGGER
Sum and accumulating total
• Sum
This value is computed by summing the data over an hour for hourly reports, over a
day for daily reports, over a week for weekly reports, and over a month for monthly
reports. It is reset at the time when the corresponding report is generated.
• Accumulating total
Accumulating total can be specified only on hourly and daily reports.
For hourly reports, this value is computed by summing the data until the time the
report is generated (the report creation time set for daily reports). It is reset every day
at the report creation time set for daily reports (the value is the same as the sum of the
daily report).
For daily reports, this value is computed by summing the data until the date and time
the report is generated (the report creation date and time set for monthly reports). It
is reset every month at the report creation date and time set for monthly reports (the
value is the same as the sum of the monthly report).
The following example shows the accumulating total for hourly reports. The time
when the daily report is generated is 8 O’clock.
7:00 8:00 9:00 10:00
Time
Hourly report creation
Specified time for creating the report
Computation result
Accumulating total
Sum
8:00 9:00 10:00 11:00
About the sum unit
In the sum computation, data are summed over the scan interval. However, for flow
values that have units /s, /min, /h, or /day a simple summation results in the actual value
not matching the computed result, because the scan interval and the unit of the input
values are different. In these cases, the unit of the data measured over the scan interval
is converted to match the unit of the input values and the computation is performed.
For example, if the scan interval is 2 s, and the input value is 100 m
3
/min, a simple
summation would add 100 every 2 s resulting in 3000 after one minute. However, if the
sum unit is set to /min, then 2s/60s is multiplied every scan interval before the value is
added giving a result that is close to the actual input value. The scan interval unit is in
seconds.
Sum Unit Conversion
Off
∑(measured/computed value)
/s
∑(measured/computed value) × data acquiring interval*
/min ∑(measured/computed value) × data acquiring interval*/60
/h
∑(measured/computed value) × data acquiring interval*/3600
/day
∑(measured/computed value) × data acquiring interval*/86400
* Data acquiring interval refers to scan interval or record interval.
2.10 Configuring the Report Function