Specifications

8 – Configuring Points
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When a source address is configured for a database type address, an equivalent
destination address is automatically defined. Destination addresses cannot be
explicitly configured for database addresses.
Note You could configure a point on a PlantScape Control Processor as a source
address for a database point. However, this is inefficient and might significantly
degrade system performance.
Internal Point Parameters
Apart from the standard point parameters (described in “Scanned Point
Parameters” on page 122) PlantScape uses a range of other parameters to store
internal information for the point. Examples of these types of parameters are
alarm limits and ranges for an analog point.
Whenever an item of information in a point needs to be referenced in another
part of the server (for example, when building custom displays), you identify that
item by specifying the point ID and the parameter name. For details of the
internal point parameters available, see Table 8.2, “Internal Point Parameters,” on
page 134.
Using Auxiliary Parameters
For an analog point you can define up to four auxiliary parameters for general
purpose use. For example, you might want to define auxiliary parameters to
represent the proportional, integral, and derivative parameters of a PID loop
controller. Auxiliary parameters can also be used for tracking and modifying
alarm limits that are held in a controller.
For each auxiliary parameter, you can configure:
Property See…
Source Address “Source and Destination Addresses” on page 144.
Destination Address “Source and Destination Addresses” on page 144.
Scan Period “Point Scanning” on page 145.
plscpcg.book Page 180 Monday, May 28, 2001 10:11 AM