YOKOGAWA Daqstation DX2040 - Page 61

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IM 04L42B01-01E
Overview of Functions
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App
Index
• ComputationDataDropout
A computation data dropout occurs if the computation is not completed within the scan
interval. For the operating procedure, see section 9.4.
• Thecomputationiconinthestatusdisplaysectionturnsyellow.
• Whenacomputationdatadropoutoccurs,thecomputeddataofthescanintervalin
which the dropout occurred is set to the data immediately before the dropout.
• Ifcomputationdatadropoutoccursfrequently,lessentheloadontheCPUby
reducing the number of computation channels or setting a longer scan interval.
• NumericDisplayandRecording
The range of displayed values of computed data is from –9999999 to 99999999
excluding the decimal point. The decimal place corresponds to the decimal place of
the lower limit span of the computation channel. On the numeric display, values are
displayed if the computed result is within the above range regardless of the upper and
lower limits of span. The following table indicates special displays.
Display/Recording ComputedDataStatus
+Over • +Displayover:Whenthecomputedresultexceeds99999999
• +Computationover:Whenthevalueexceedsapproximately
1.79E+308 in the middle of the computation
• Whenacomputationerror*occurs(select+Overor–Over.)
–Over • –Displayover:Whenthecomputedresultislessthan–9999999
• –Computationover:Whenthevalueislessthanapproximately
–1.79E+308 in the middle of the computation
• Whenacomputationerror*occurs(select+Overor–Over.)
* Computation error occurs when the following computation is carried out.
 • X/0,SQR(–X),orLOG(–X)
 • IfachannelnumbersettoskiporOffisusedintheequation
• RollingAverage
The rolling average of the computed result of the equation specified for the
computation channel is determined, and the result is the computed data for that
channel. The number of samples and the sampling interval can be specified for each
computation channel. The rolling average is applied over the time corresponding to “the
number of data samples × the sampling interval.” The maximum sampling interval is 1
hour, and the maximum number of samples is 1500.
• StartingtheComputation
You can configure the DX to start the computation when you press the START key.
• UsageofTLOGComputations
TLOG computation determines the sum, maximum, minimum, average, or the
difference between the maximum and minimum of a specific channel for each interval
determined by a timer.
 TimersThatAreUsed
The timer that is used is assigned to each channel.
 UnitofSumComputation
Set the sum scale when using sum computation (TLOG.SUM).
Select Off, /s, /min, or /h. For details, see page 1-51.
1.8ComputationandReportFunction(/M1and/PM1Options)