Point Database
Siemens Building Technologies, Inc.
4-3
Landis Division
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A virtual point is a logical point without a physical device. Refer to the
System 600 APOGEE
Field Panel User’s Manual
(125-3000).
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The following examples demonstrate how virtual points can be used:
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Virtual points can store desired values such as temperature, relative humidity, and pressure.
For the system to make adjustments to control equipment, the system needs to compare
the actual value to the desired value. The field panel stores the desired value in memory as a
virtual analog output point.
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Virtual points are often used to store operational data. For example, a virtual point can be
used to store the high and low temperatures for outside air. Applications such as Start/Stop
Time Optimization (SSTO) use virtual points for different types of values.
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PPCL uses times and dates to accomplish building control.
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Every PPCL program has a set of fixed local points. Local points are used primarily in PPCL
programming. Refer to the
PPCL Editor
chapter of the
System 600 APOGEE Field Panel
User’s Manual
(125-3000) for more information on using local points.
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Each point (logical or virtual) is composed of attributes that define it in the database. These
attributes are:
