INTRODUCTION
GLOSSARY OF TERMS AND ABBREVIATIONS
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I-E96-316A
®
GLOSSARY OF TERMS AND ABBREVIATIONS
Term
Definition
Analog
A continuous time signal with an infinite number of values.
CTT
Configuration and Tuning Terminal; hand held module that provides a local means
for system configuration, tuning and diagnostics.
Configuration
A control strategy with function blocks.
Controlway
A redundant peer-to-peer communication path for point data transfer between
intelligent modules within a process control unit.
Digital
A discrete signal having only two states: on or off.
Dipshunt
Dual in-line package with shorting bars.
Dipswitch
A dual in-line package that contains single pole switches.
EWS
Engineering Work Station; an integrated hardware and software personal com-
puter system for configuring and monitoring INFI 90 modules.
Function Code
An algorithm which defines specific functions. These functions are linked together
to form the control strategy.
LED
Light Emitting Diode; the module front panel indicator that shows status and error
messages.
LSB
Least Significant Bit; the bit of a binary number that carries the least numerical
weight.
Master Module
One of a series of controller modules designed to direct field processes through a
slave module. The multi-function processor is an example.
MFP
Multi-Function Processor Module; a multiple- loop controller with data acquisition
and information processing capabilities.
MMU
Module Mounting Unit; a card cage that provides electrical and communication
support for INFI 90 modules.
MSB
Most Significant Bit; the bit of a binary number that carries the most numerical
weight.
OIS
Operator Interface Station; integrated operator console with data acquisition and
reporting capabilities. It provides a window into the process for flexible control and
monitoring.
PCU
Process Control Unit; rack type industrial cabinet that contains master, slave and
communication modules, and their communication paths.
Slave Expander Bus
Parallel address/data bus between the master module and the slave.
TM
Termination Module; provides input/output connection between plant equipment
and the INFI 90 process modules. The termination module slides into a slot in the
termination mounting unit.
TU
Termination Unit; provides input/output connection between plant equipment and
the INFI 90 process modules. The termination unit is a flat circuit board for panel
mounting.
