Specifications

PlantScape Server and Client Configuration Guide Glossary - 1
Glossary
accumulator point
A point type used to represent counters. Information contained in the accumulator point
can include: the raw value, a process value, a rollover value, a scale factor, and a meter
factor.
acronym
A text string used on a display to represent a state or a value in a form that is convenient
for operators. For example, a value of “0” for a point parameter in the database might be
represented on a system status display by the acronym “Stopped”.
action algorithm
One of two types of algorithm you can assign to a point in order to perform additional
processing to change point parameter values. An action algorithm performs an action
when the value of the PV changes. Contrast with PV algorithm.
ActiveX component
An ActiveX component is a type of program designed to be called up from other
applications, rather than being executed independently. An example of an ActiveX
component is a custom dialog box, which works in conjunction with scripts, to facilitate
operator input into Station.
alarm
An indication (visual and/or audible) that alerts an operator at a Station of an abnormal
or critical condition. Each alarm has a type and a priority. Alarms can be assigned either
to individual points or for system-wide conditions, such as a controller communications
failure. Alarms can be viewed on a Station display and included in reports. PlantScape
classifies alarms into the following types:
•PV Limit
• Unreasonable High and Unreasonable Low
• Control Failure
• External Change
alarm/event journal
A file that records all alarms and events. It is accessed to generate reports and can also
be archived to off-line media.
plscpcg.book Page 1 Monday, May 28, 2001 10:11 AM