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Allen-Bradley 1746-NT8 User Manual

Allen-Bradley 1746-NT8
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SLC 500
Thermocouple/mV
Analog Input
Module
1746-NT8
User Manual

Table of Contents

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Allen-Bradley 1746-NT8 Specifications

General IconGeneral
ManufacturerAllen-Bradley
Product TypeAnalog Input Module
SeriesSLC 500
Input Channels8
Backplane Current @ 5VDC120 mA
Resolution16 bits
Isolation1500 VAC
Operating Temperature0 to 60 °C
Storage Temperature-40°C to 85°C (-40°F to 185°F)
Relative Humidity5 to 95% (non-condensing)
Input TypeThermocouple
Communication PortNot applicable

Summary

Module Overview

Input Ranges

Defines the supported thermocouple and millivolt input ranges for the module's channels.

Installing And Wiring Your Module

Electrostatic Damage

Crucial safety precautions for handling sensitive electronic components to prevent damage.

Power Requirements

Specifies the power consumption of the module for system design and chassis compatibility.

Module Installation and Removal

Step-by-step instructions for physically installing and removing the module from the chassis.

Wiring Your Module

General guidelines for connecting input signal cables to the module, including noise considerations.

Preparing and Wiring the Cables

Detailed steps for preparing cable leads and drain wires for connection to the terminal block.

Considerations Before Using Your Module

Module Addressing

Details the memory map and addresses for the module's input and output data in the SLC processor.

Channel Filter Frequency Selection

Explains how to select digital filter frequencies for noise rejection and update time optimization.

Update Time

Details the factors affecting module update time and provides calculation methods.

Channel Configuration, Data, and Status

Channel Configuration Procedure

A step-by-step guide for configuring the module's input channels via ladder logic or software.

Select Channel Enable (Bit 0)

Configures whether a specific channel is active and enabled for scanning by the module.

Select Input Types (Bits 1 through 4)

Sets the type of input device (thermocouple or mV) connected to each channel.

Select Data Format (Bits 5 and 6)

Defines how the input data is expressed in the channel's data word (e.g., engineering units, PID).

Select Open-Circuit State (Bits 7 and 8)

Configures the module's response to open-circuit conditions for each channel.

Select Channel Filter Frequency (Bits 10 and 11)

Configures the digital filter for noise rejection and impacts channel update time and resolution.

Channel Status Bits

Detailed explanations of status bits indicating channel conditions, errors, and configuration states.

Programming Examples

Initial programming example

A basic example demonstrating how to send initial configuration data to the module.

Automatic Monitoring Thermocouples and CJC Sensors

Example for dynamically changing channel configuration to monitor temperature sensors periodically.

Interfacing to the PID Instruction

Example showing how to use module data as a process variable in the SLC PID instruction.

Monitoring Channel Status Bits

How to monitor channel status bits for errors and other operational conditions.

Monitoring Channel Status Bits Example

A specific ladder logic example demonstrating the monitoring of channel status bits.

Troubleshooting Your Module

LED Troubleshooting Tables

Guides users to diagnose module issues by interpreting the status of module and channel LEDs.

Troubleshooting Flowchart

A visual guide to systematically diagnose and resolve module issues based on symptoms and LED status.

Maintaining Your Module And Safety Considerations

Safety Considerations

Essential safety guidelines and precautions for working with electrical equipment and machinery.

Module Specifications

Overall Accuracy

Discussion on factors affecting module accuracy, including hardware, software, and temperature variations.

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