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CHAPTER 9 USING TREND GRAPH FUNCTION
9.12
Displaying Abnormal Graphs
High Speed data logger Q Analog Input QnUDVCPU L CPU
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L Analog Input
An abnormal graph is displayed when the value of data is a nonnumeric or infinite value.
When a float (single precision, double precision) is expressed as a numeric value, a bit string that is not recognized as
a numeric value is handled as a nonnumeric value.
By the scaling function of High Speed Data Logger Module, values of data may become plus infinite/minus infinite
values.
The following explains the display of nonnumeric and infinite values on the trend window.
(1) Graph display on the trend window
• The graph is not displayed while nonnumeric values continues.
• The cursor labels of the graph are not displayed while nonnumeric values continues.
• For the plus infinite value, the graph attaches to the upper limit display value.
• For the minus infinite value, the graph attaches to the lower limit display value.
9.12 Displaying Abnormal Graphs
(2) Cursor values of graph legends
Values of graph legends are displayed as follows.
• Nonnumeric value: "NaN"
• Plus infinite value: "Inf"
• Minus infinite value: "-Inf"
(3) Cursor value and difference information displayed on the status bar of the
trend window
Cursor Value on the status bar, and Difference (Blue → Red), Value (Blue) in the difference information area are
also displayed as follows.
• Nonnumeric value: "NaN"
• Plus infinite value: "Inf"
• Minus infinite value: "-Inf"
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