ABB IMASI13 - Page 4

WBPEEUI240766B0 iii
Table of Contents
Section 1 Introduction ..................................................................................................1-1
Overview .................................................................................................................. 1-1
Intended User .......................................................................................................... 1-1
Features .................................................................................................................. 1-1
Instruction Content.................................................................................................. 1-3
How to Use this Instruction...................................................................................... 1-4
Document Conventions ............................................................................................ 1-5
Glossary of Terms and Abbreviations........................................................................ 1-5
Reference Documents............................................................................................... 1-5
Related Nomenclature .............................................................................................. 1-6
Specifications........................................................................................................... 1-6
Section 2 Description and Operation .........................................................................2-1
Introduction............................................................................................................. 2-1
Module Description .................................................................................................. 2-1
Functional Operation ............................................................................................... 2-1
Isolated A/D Converter......................................................................................... 2-2
Cold Junction Reference....................................................................................... 2-2
Digital Input Multiplexer (MUX) ............................................................................ 2-3
Microcontroller and Memory................................................................................. 2-3
Switch Settings .................................................................................................... 2-3
LED Indicators ..................................................................................................... 2-4
I/O Expander Bus.................................................................................................... 2-4
I/O Expander Bus Interface.................................................................................. 2-5
Data Values ......................................................................................................... 2-5
Termination Units ................................................................................................ 2-5
Function Codes .................................................................................................... 2-6
Automatic Adjustments and Corrections .................................................................. 2-6
Input Processing .................................................................................................. 2-6
Point Value Calculation ........................................................................................ 2-7
Input Calibration.................................................................................................. 2-7
Cold Junction Compensation................................................................................ 2-7
User Gain and Offset Adjustment ......................................................................... 2-8
Engineering Units Conversion .............................................................................. 2-8
Automatic Calibration .......................................................................................... 2-9
Field Calibration................................................................................................... 2-9
Diagnostic, Security, and Integrity Checks ............................................................... 2-9
Diagnostics in Diagnostic Mode ............................................................................ 2-9
Diagnostics During Normal Operation ................................................................ 2-10
Diagnostics on Reset .......................................................................................... 2-10
I/O Expander Bus Communication Security....................................................... 2-10
Open Input Detection ......................................................................................... 2-10