Specifications

Configuring Algorithms
PlantScape Server and Client Configuration Guide 193
Configuring Algorithms
Algorithms perform additional point processing or initiate actions when point
values change.
Note • You cannot configure algorithms for flexible points and container points
(see “Template Displays and Container Points” on page 237).
• For information about constraints on configuring algorithms for a distributed
server architecture, see “Working with Algorithms” on page 348.
• You cannot configure algorithms for points on PlantScape Control
Processors. However, you can reference Control Processor points in
algorithms that are attached to other point types.
.
PlantScape provides a number of standard algorithms, each performing a
different function. These algorithms are available for alarm processing, data
analysis, value transportation, action requests, downtime analysis, and application
task requests.
Each type of algorithm has a different number. This number is specified when the
algorithm is configured for a point. For example, the value transportation
algorithm is algorithm number 68.
Two classes of algorithm are available:
• PV algorithms (see page 193)
• Action algorithms (see page 194)
PV Algorithms
PV algorithms perform data gathering or data manipulation. The result of the
algorithm operation is usually stored in the PV of the point to which it is attached.
PV algorithms are processed whenever the PV changes by more than the
configured drift deadband amount for the point.
For example, say you needed to determine the number of hours that a pump has
been running and to store this value in a point’s PV. You could attach the “run
hours” algorithm to the status point, which determines whether or not the pump
is running, and this would give a “run hours” reading.
The following PV algorithms are available.
• General Arithmetic (Algo#4)
• Production (Algo#5)
plscpcg.book Page 193 Monday, May 28, 2001 10:11 AM