Product Overview

Controller Design and Application

The Allen-Bradley 1756-L83EXT is a ControlLogix-XT Controller from the ControlLogix-XT 5580 series. This device comes with 10 MB of standard user memory for program and data storage. An optional 2 GB non-volatile memory is available for expanded storage capacity. Consequently, the 1756-L83EXT suits large-scale automation applications requiring substantial memory. The controller is designed for extreme temperature environments with XT-rated chassis.

Extended Temperature Performance

The 1756-L83EXT operates in extreme temperatures from -25 to 70°C when installed in XT chassis from Series C. Therefore, it functions reliably in outdoor, unheated, or high-temperature environments. The non-operating temperature range extends from -40 to 85°C for storage and transport. Consequently, this controller eliminates the need for climate-controlled enclosures in many harsh applications.

Memory and Task Management

This controller supports 32 controller tasks with up to 1000 programs per task. Therefore, complex, multi-rate control strategies are easily implemented. The 10 MB user memory provides ample space for large programs and data tables. Consequently, the 1756-L83EXT handles demanding process and discrete control applications.

Technical Specifications

General Specifications

• Manufacturer: Rockwell Automation

• Brand: Allen-Bradley / Rockwell Automation

• Part Number: 1756-L83EXT

• Series: ControlLogix (ControlLogix-XT 5580)

• Product Type: Controller

• Enclosure Rating: Open-style

• Module Location: Chassis-based

Memory Specifications

Power and Current Specifications

Isolation Specifications

Isolated Circuits:

• USB port to backplane

• USB port to Ethernet port

• Ethernet port to backplane

Environmental Specifications

Mechanical Specifications

Wire Categories

• USB Ports: Wire Category 3

• Ethernet Ports: Wire Category 2

Agency Approvals and Certifications

The 1756-L83EXT is listed and approved for compliance with multiple standards.

Supported Programming Languages

The 1756-L83EXT supports multiple IEC programming languages.

Installation Guide

Follow these steps to install the Allen-Bradley 1756-L83EXT correctly.

1. Power Down Chassis: First, disconnect power from the ControlLogix chassis completely.

2. Select XT Chassis: Next, ensure you are using a Series C or later XT-rated chassis.

3. Insert Controller: Then, slide the 1756-L83EXT firmly into the selected slot.

4. Secure Module: After that, engage the locking mechanism to hold the controller in place.

5. Connect Communications: Meanwhile, attach Ethernet and USB cables as required.

6. Apply Power: Finally, restore power and verify the controller status.

The 1756-L83EXT requires an XT-rated chassis for extended temperature operation. Therefore, do not install this controller in standard chassis for extreme temperature applications. In addition, use the appropriate wire categories for USB (Category 3) and Ethernet (Category 2). Consequently, proper installation ensures reliable controller operation in harsh environments.

Package List

The package includes the following physical items.

• Allen-Bradley 1756-L83EXT ControlLogix-XT controller (1 piece)

• Product label with part number and specifications

• Anti-static protective bag for safe transport

*Note: The optional 2GB non-volatile memory is not included. Ethernet and USB cables are sold separately. Programming software is not provided with this controller.*

Frequently Asked Questions (FAQ)

1. How much user memory does the 1756-L83EXT have?

The Allen-Bradley 1756-L83EXT provides 10 MB of standard user memory. Therefore, it handles large control programs and extensive data tables. An optional 2 GB non-volatile memory is available for expanded storage. Consequently, the controller suits demanding automation applications requiring substantial memory capacity.

2. What is the operating temperature range of the 1756-L83EXT?

The Allen-Bradley 1756-L83EXT operates from -25 to 70°C when installed in XT chassis from Series C. Therefore, it functions reliably in extreme environments without additional climate control. The non-operating range extends from -40 to 85°C. Consequently, the controller is ideal for outdoor, unheated, or high-temperature locations.

3. What XT chassis is required for the 1756-L83EXT?

The Allen-Bradley 1756-L83EXT requires an XT chassis from Series C or later for extended temperature operation. Therefore, standard ControlLogix chassis do not provide the same thermal performance. The XT chassis is specifically designed for harsh environments. Consequently, always verify chassis compatibility before installation.

4. How many tasks does the 1756-L83EXT support?

The Allen-Bradley 1756-L83EXT supports up to 32 controller tasks. Each task can contain up to 1000 programs. Therefore, complex, multi-rate control strategies are easily implemented. Consequently, the controller handles both fast discrete and slow process control loops simultaneously.

5. What programming languages does the 1756-L83EXT support?

The Allen-Bradley 1756-L83EXT supports relay ladder logic, structured text, sequential function chart, and function block diagram. Therefore, programmers can choose the best language for each application. Multiple languages can be mixed within the same project as well. Consequently, the controller accommodates various programming preferences and legacy code.

6. What is the current draw of the 1756-L83EXT?

The Allen-Bradley 1756-L83EXT draws 5 mA at 1.2V DC minimum and 1.2 A at 5.1V DC maximum. Therefore, calculate total backplane current before adding multiple modules. Power dissipation is 6.2 W with thermal dissipation of 21.2 BTU/hour. Consequently, ensure your power supply can handle this load.

7. What agency approvals does the 1756-L83EXT hold?

The Allen-Bradley 1756-L83EXT holds multiple approvals including CSA, CE, RCM, Ex, IECEx, FM, cULus, KC, and EAC. Therefore, it meets international standards for safety and performance. These approvals simplify global machine certification. Consequently, the controller suits export-oriented equipment manufacturers.

Related Accessories

Enhance your ControlLogix-XT system with these compatible parts.

• XT Chassis: Allen-Bradley 1756-XT series (Series C or later) for extended temperature operation

• Power Supply: Allen-Bradley 1756-XT series power supply for harsh environments

• Non-Volatile Memory: 2 GB optional memory card for program storage

• Programming Software: Rockwell Studio 5000 for controller configuration

• Ethernet Cable: Shielded Cat6 cable for 1GB communication

Always use genuine Allen-Bradley components with the 1756-L83EXT. Therefore, third-party chassis may not provide the required thermal performance. In addition, use only XT-rated accessories for extended temperature applications. Consequently, using authentic parts ensures optimal controller performance in harsh environments.