Specifications

Glossary
PlantScape Server and Client Configuration Guide Glossary - 5
Distributed Server Architecture
An option that enables multiple PlantScape servers to share point data, alarms, and
history without the need for duplicate configuration on any server. This is the preferred
method for transferring data between servers in large systems.
DNS
Domain Name System.
DSR
Data Signal Ready.
DTE
Data Terminal Equipment.
DTR
Data Terminal Ready.
dual-bit status point
A status point that reads two bits. Status points can read one, two or three bits.
EIM
Ethernet Interface Module.
ELPM
Ethernet Loop Processor Module.
EMI
Electromagnetic Interference.
event
A significant change in the status of an element of the system such as a point or piece of
hardware. Some events have a low, high, or urgent priority, in which case they are
further classified as alarms. Events can be viewed on an operator Station display and
included in reports.
Within the context of scripts, an event is a change in system status or an
operator-initiated action that causes a script to run.
exception scan
A scan that takes place only when a change occurs at a controller address configured for
a point parameter. Some controllers can notify the server when a change occurs within
the controller. The server uses exception polling to interrogate the controller for these
changes. This type of scan can be used to reduce the scanning load when a fast periodic
scan is not required.
plscpcg.book Page 5 Monday, May 28, 2001 10:11 AM