Floating Point Values NaN, INF, and

In Building Operation, the floating point values “Not a Number”, positive infinity, or negative infinity may be displayed in the Basic property tab, in a trend log list, or a trend chart.

The IEEE standard for Floating-point Arithmetic representation is used for these values:

NaN: A floating point value meaning “Not a Number”. Support for NaN is provided for interoperability with other devices or systems that produce NaN values.

Positive Infinity or Negative Infinity: Floating point value, sometimes represented as Infinity, –Infinity, INF, or –INF. Support for positive and negative infinity is provided for interoperability with other devices or systems that produce these values.

有关更多信息，请参阅 Institute of Electrical and Electronics Engineers document IEEE 754 ..

Basic Property Tab and Watch Window

Certain object properties may display values representing “Not a Number”, positive infinity, or negative infinity. These values are displayed in accordance with the localization settings, observing capitalization and sign (positive or negative). The presentations of these values with English localization are shown in the table and examples below.

表格： Display of Values

Value	Property Tab Presentation	Watch Window Presentation
Not a Number	NaN	NaN
Positive Infinity	Infinity	Infinity
Negative Infinity	–Infinity	–Infinity

In the Basic Property Tab

You can view property values representing “Not a Number”, positive infinity, or negative infinity in the Basic property tab.

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图： Example of NaN, Infinity, or –Infinity Value Displayed in Basic Property Tab

In the Watch Window

You can monitor property values representing “Not a Number”, positive infinity, or negative infinity in the Watch Window.

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图： Example of NaN, Infinity, or –Infinity Value Displayed in Watch Window

Trends

Property values representing “Not a Number”, positive infinity, or negative infinity can be trended and displayed in the trend log and trend chart. The presentations of these values with English localization are shown in the table and examples below.

表格： Presentation of Values

Value	Trend Log Presentation	Trend Chart Presentation
Not a Number	NaN	NaN
Positive Infinity	Infinity	INF
Negative Infinity	–Infinity	–INF

In the Trend Log List

You can view the trend data in a trend log list. 有关更多信息，请参阅 Trend Log Lists .

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图： NaN, Infinity, and –Infinity Displayed in Trend Log List

In Trend Charts

You can view the trend data in a trend chart. 有关更多信息，请参阅趋势图 .

When you select the Line option for a trend chart, the values are plotted on a line and displayed as abbreviations. You can view the complete value by hovering the pointer over any of these values. In the example that follows, the trend chart settings are set to Show markers so that it is easier to read the chart.

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图： NaN, Infinity, and –Infinity Displayed in Trend Chart

Component	Displayed Value	Tool Tip
action_zoom_plus_stroke	INF	action_zoom_plus_stroke
action_zoom_plus_stroke	–INF	action_zoom_plus_stroke
action_zoom_plus_stroke	NaN	action_zoom_plus_stroke

The same series can be presented in different ways by selecting the Discrete Line , Digital , or Bars option, as shown in the following examples. 有关更多信息，请参阅 Trend Series .

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图： Trend Chart with Discrete Line Display Option Selected

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图： Trend Chart with Digital Display Option Selected

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图： Trend Chart with Bars Display Option Selected

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Floating Point Values NaN, INF, and –INF

Basic Property Tab and Watch Window

Trends