INTRODUCTION
GLOSSARY OF TERMS AND ABBREVIATIONS (continued)
1 - 6
I-E96-301B
®
GLOSSARY OF TERMS AND ABBREVIATIONS
(continued)
Term
Definition
High Level Voltage
For IMASI03 applications, high level voltage inputs are values between -10 and +10
Volts.
INFI-NET
Advanced data communication highway for the INFI 90 system having 250 node
capacity.
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.
Low Level Voltage
For IMASI03 applications, low level voltage inputs are values between -100 millivolts
and +100 millivolts.
Master Module
One of a series of controller modules designed to interface with 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.
Normal Mode
Rejection
Indicates the ability to reject normal mode voltage (differ to - Voltage) by a
specified amount (in units of dB at a specified frequency, such as 60 Hz).
NVRAM
Nonvolatile random access memory; memory whose data does not change when
power is removed.
OIS
Operator Interface Station; integrated operator console with data acquisition and
reporting capabilities. It provides a window into the process for flexible control, tuning
and monitoring.
PCU
Process Control Unit; rack type industrial cabinet that contains master, slave and
communication modules, their communication paths and power supplies.
PROM
Programmable read only memory.
RAM
Random Access Memory.
RTD
Resistance Temperature Detector. A sensing device that changes resistance based
on changes of ambient temperature.
SRAM
Static Random Access Memory.
Slave Expander
Bus
A parallel address/data bus used for communication between the master module and
the slave.
Thermocouple
A bimetal sensor used for temperature measurements.
