Specifications

Glossary
PlantScape Server and Client Configuration Guide Glossary - 7
history gate
A status point parameter that is used to control the collection of history for an analog or
status point. The history is only collected if the gate state value of the nominated
parameter is in the nominated state.
host server
In a distributed server architecture, the server on which a remote point’s definition is
stored and from which alarms for the point originate.
HTTP
Hypertext Transfer Protocol.
HVAC
Heating, Ventilation and Air Conditioning.
Hybrid Controller
The term used to refer to all control hardware (chassis, power supply, Control
Processor, and ControlNet bridge) as a single entity in a PlantScape system.
IEEE
Institute of Electrical and Electronic Engineers.
input value
Values that are usually scanned from the controller registers but can be from other
server addresses. Input values can represent eight discrete states. Up to three values can
be read from an address in order to determine a state.
IRQ
Interrupt Request.
item
In Quick Builder, the elements necessary for data acquisition and control that comprise
the PlantScape server data and are defined in the project file. These are:
• Channels
• Controllers
• Stations
•Points
• Printers
item grouping
A collection of items grouped by a common property.
plscpcg.book Page 7 Monday, May 28, 2001 10:11 AM