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Allen-Bradley 1746-NT8 User Manual

Allen-Bradley 1746-NT8
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i Publication 1746-UM022B-EN-P - January 2005
Table of Contents
Preface
Who Should Use This Manual . . . . . . . . . . . . . . . . . . . . . . P-1
What This Manual Covers . . . . . . . . . . . . . . . . . . . . . . . . . P-1
Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . P-2
Common Techniques Used in this Manual . . . . . . . . . . . . . P-2
Chapter 1
Module Overview
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Input Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Hardware Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Diagnostic LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Module Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Linear Millivolt Device Compatibility. . . . . . . . . . . . . . . 1-7
Chapter 2
Installing And Wiring Your
Module
Electrostatic Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Considerations for a Modular System . . . . . . . . . . . . . . 2-2
Fixed I/O Chassis - I/O Module Compatibility . . . . . . . . 2-3
General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Module Installation and Removal . . . . . . . . . . . . . . . . . . . . 2-5
Terminal Block Removal . . . . . . . . . . . . . . . . . . . . . . . 2-6
Wiring Your Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Preparing and Wiring the Cables . . . . . . . . . . . . . . . . . 2-9
Cold-Junction Compensation (CJC) . . . . . . . . . . . . . . . . 2-11
Chapter 3
Considerations Before Using Your
Module
Module ID Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Output Image - Configuration Words . . . . . . . . . . . . . . 3-2
Input Image - Data Words and Status Words. . . . . . . . . 3-3
Channel Filter Frequency Selection . . . . . . . . . . . . . . . . . . 3-3
Channel Cut-Off Frequencyc . . . . . . . . . . . . . . . . . . . . 3-4
Channel Step Response . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Update Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Update Time Calculation Example . . . . . . . . . . . . . . . . 3-8
Channel Turn-On, Turn-Off, and Reconfiguration Times . . . 3-8
Auto-calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Response to Slot Disabling . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Input Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Output Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Table of Contents

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Allen-Bradley 1746-NT8 Specifications

General IconGeneral
BrandAllen-Bradley
Model1746-NT8
CategoryI/O Systems
LanguageEnglish

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