INTRODUCTION
GLOSSARY OF TERMS AND ABBREVIATIONS
I-E96-209A
1 - 3
GLOSSARY OF TERMS AND ABBREVIATIONS
Term
Description
CTM
Configuration and Tuning Module. Provides a local means for system configuration,
tuning, and monitoring of intelligent masters over module bus.
CTT
Configuration and Tuning Terminal. A handheld module with the same functionality
as the Configuration and Tuning Module.
Checksum
A value computed from a data stream by treating each element as a number and
computing the sum of the elements.
Configuration
The act of setting up equipment to accomplish specific functions or a list of parame-
ters associated with such a setup.
Controlway
High speed, redundant, peer-to-peer communication link. Used to transfer informa-
tion between intelligent modules within a process control unit.
Dipshunt
Dual in-line package with shorting straps.
Dipswitch
A dual in-line package that contains switches.
EWS
Engineering Work Station.
Executive Block
Fixed function block that determines overall module operating characteristics.
Function Block
The occurrence of a function code at a block address of a module.
Function Code
An algorithm which manipulates specific functions. These functions are linked
together to form the control strategy.
LED
Light Emitting Diode.
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.
MFT
Machine Fault Timer. Reset by the processor during normal operation. If not reset
regularly, the MFT times out and the module stops.
MMU
Module Mounting Unit. A card cage that provides electrical and communication sup-
port for INFI 90/Network 90 modules.
Module Bus
Peer-to-peer communications link used to transfer information between intelligent
modules within the process control unit.
MSB
Most Significant Bit. The bit of a binary number that carries the most numerical
weight.
NVRAM
Nonvolatile random access memory. Retains stored information when power is
removed.
Node
A point of interconnection to a network.
