Emerson NGA2000 PMD Manuel D’Utilisation

Page de 88
Instruction Manual 
760007-A 
July 2003 
P-6       Preface                                                                                   Rosemount Analytical Inc.    A Division of Emerson Process Management 
Model NGA2000 PMD
GLOSSARY  OF  TERMS 
Analyzer Module 
The module that contains all sensor/detector components for development of a Primary Variable signal; in-
cludes all signal conditioning and temperature control circuitry. 
Backplane 
The interconnect circuit board which the Controller Board, Power Supply, Analyzer Module power and net-
work cables, I/O Modules and Expansion Modules plug into. 
Control Module 
The Operator Interface plus the Controller Board. 
Controller Board 
The computer board that serves as the Network Manager and operates the Display and Keypad. 
Distribution Assembly 
The Backplane and the card cages that hold I/O and Expansion Modules. 
Expansion Module 
A circuit board that plugs into the Backplane from the front of the Platform and performs special features 
not related to I/O functions. 
I/O Module 
A circuit board that plugs into the Backplane from the rear of the Platform.  Has a connector terminal for 
communication with external data acquisition devices and provides an input/output function. 
Operator Interface 
The Display and Keyboard. 
Platform 
Any workable collection of the following: Controller Board, Power Supply, Distribution Assembly, Enclosure 
and Operator Interface. 
Power Supply 
Any of a variety of components that provides conditioned power to other NGA2000 components, from the 
Power Supply Board that plugs into the front of the Backplane in a stand-alone instrument to several larger 
ones that can power larger collections of modules and components. 
Primary Variable 
The measured species concentration value from an Analyzer Module. 
Secondary Variable 
Data placed on the network by a module regarding current status, e.g., sample flow, source voltage and 
other diagnostic information.