Specifications

Glossary
PlantScape Server and Client Configuration Guide Glossary - 13
RTU
See controller.
S9000
Series 9000 controller.
SafeBrowse object
A SafeBrowse object is a Web browser specifically designed for use with Station.
SafeBrowse includes appropriate security features that prevent users from displaying
unauthorized Web pages or other documents in Station.
scan
The technique used to read data from a controller. Scans are conducted for point
parameters with source addresses (for example, PV, SP, OP, MD, An). PlantScape uses
demand, exception, and periodic scanning techniques.
scan packet
A group of point parameter source addresses assembled by the server and used as the
basic unit of server data acquisition. The server groups points into scan packets based
on the controller address that they reference and the scan period defined.
scan period
The time interval that specifies the frequency at which the PlantScape server reads input
values from the memory addresses of controllers. Scan periods are measured in
seconds; a scan period of 120 seconds means that the server scans the controller once
every 120 seconds.
scheduler
A facility used to schedule the control of a point on either a periodic or once-only basis.
script
A script is a mini-program that performs a specific task. In displays, for example, scripts
are often used to produce animations.
security level
Access to PlantScape functions is limited by the security level that has been assigned to
each operator. PlantScape has six security levels. An operator is assigned a security level
and may perform functions at or below the security level that has been assigned to that
operator.
server
The computer on which the PlantScape database software runs.
plscpcg.book Page 13 Monday, May 28, 2001 10:11 AM