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INTRODUCTION
GLOSSARY OF TERMS AND ABBREVIATIONS
I-E96-213A
1 - 5
GLOSSARY OF TERMS AND ABBREVIATIONS
Term
Definition
Analog
A signal with an infinite number of values as opposed to a digital value that is either 0
or 1.
Checksum
The sum of the bytes in a memory. This sum is used in software security checks to
verify software and hardware integrity.
Configuration
Defining module operations (control strategy) with function blocks.
CTM
Configuration/Tuning Module - INFI 90/NETWORK 90 module used to enter new
configurations, modify existing configurations, read status words, etc.
CTT
Configuration Tuning Terminal - hand held module; same functionality as CTM.
Digital
A value that is either 0 or 1.
Executive Block
Fixed function block that determines module operating characteristics.
Function Block
An area in the MFC's user defined memory containing a function code.
Function Code
Defines operation(s) to be done (e.g., AND, OR, PID).
LSB
Least Significant Bit (of MFC error code).
MCS
Management Command System - a CRT-based operator monitor and control
console; also used in configuration.
MFT
Machine Fault Timer - reset by the processor during normal operation. If there is an
error, the MFT times out and the module stops.
Module Bus
Serial communication link between Multi-Function Controller and other control
modules.
MSB
Most Significant Bit (of MFC error code).
NVM
Nonvolatile memory - battery backed RAM.
OIS
Operator Interface Station - a CRT-based operator monitor and control console; also
used in configuration.
PCU
Process Control Unit - rack type industrial type cabinet containing control and slave
modules.
Primary
The active module in a redundant configuration.
Secondary
The backup module in a redundant configuration.
Slave Expander
Bus
Communication link between Multi-Function Controller and slave modules.
TM
Termination module - high density terminator for process wiring.
TU
Termination unit - terminator for process wiring.