Allen-Bradley 1756-L82EXT – ControlLogix-XT 5580 Controller with Conformal Coating

The Allen-Bradley 1756-L82EXT is a ControlLogix-XT controller. Specifically, this controller belongs to the ControlLogix-XT 5580 Controllers series from Rockwell Automation. It operates similarly to standard ControlLogix controllers. However, it features conformal coating for enhanced environmental protection. Furthermore, it includes built-in USB and Ethernet communication ports. Consequently, this processor suits harsh and corrosive environments where standard controllers may fail.

Ordering Configuration and Product Identification

• Brand: Allen-Bradley / Rockwell Automation.

• Series: ControlLogix.

• Part Number: 1756-L82EXT.

• Product Type: Controller.

• Product Line: ControlLogix-XT 5580.

• User Memory: 5 MB.

• Optional Nonvolatile Memory: 20 MB (with optional module).

• Maximum Controller Tasks: 32 tasks.

• Maximum Programs per Task: 1000 programs.

• Programming Languages: Structured Text, Relay Ladder Logic, Sequential Function Chart, Function Block Diagram.

• Communication Networks: DeviceNet, Data Highway Plus, Ethernet, Remote I/O, SynchLink.

• Therefore, the Allen-Bradley 1756-L82EXT offers substantial memory and multitasking capability.

Conformal Coating and Environmental Protection

• Coating Type: Conformal coating applied to circuit board.

• Purpose: Protects against hazardous and corrosive environments.

• Benefit: Extends product lifespan in challenging conditions.

• Application: Chemical plants, outdoor installations, high-humidity areas.

• XT Suffix: Indicates extended temperature and conformally coated version.

• Standard Controllers: Do not include conformal coating.

• Independent Operation: Temperature range of -25°C to 70°C.

• With Flex I/O-XT Devices: Temperature range of -20°C to 70°C.

• Thus, the 1756-L82EXT is specifically designed for harsh industrial applications.

Current Draw and Power Specifications

• Minimum Current Draw (1.2 Volts DC): 5 milliamps.

• Maximum Current Draw (5.1 Volts DC): 1.2 Amps.

• Power Dissipation: 6.2 Watts.

• Thermal Dissipation: 21.2 BTU per hour.

• Shock Rating: 30 G.

• Vibration Rating: 2 G at 10 to 500 Hz.

• Enclosure Type: Open-style (requires chassis installation).

• Consequently, the 1756-L82EXT consumes moderate power while withstanding mechanical stress.

Communication Ports and Networking

• Built-in USB Port: Yes, for programming and configuration.

• Embedded Ethernet Port: Yes, for high-speed network communication.

• DeviceNet Support: For device-level networks.

• Data Highway Plus (DH+): For legacy network integration.

• Remote I/O (RIO): For distributed I/O applications.

• SynchLink: For high-speed synchronization between controllers.

• EtherNet/IP: Fully supported for industrial automation.

• Machine Control: Intended for controlling machines and communication system components.

• System Integration: Seamless with other ControlLogix-XT components.

• Therefore, the Allen-Bradley 1756-L82EXT offers versatile connectivity for various network architectures.

Programming Languages Support

• Relay Ladder Logic: Supported for traditional PLC programmers.

• Structured Text: Supported for complex mathematical operations.

• Sequential Function Chart (SFC): Supported for batch and sequential processes.

• Function Block Diagram (FBD): Supported for process control applications.

• IEC 61131-3 Compliance: Yes, all languages conform to standards.

• Flexibility: Multiple languages within the same project.

• Code Reuse: User-defined function blocks are supported.

• Software Platform: Studio 5000 Automation Engineering & Design Environment.

• Thus, the 1756-L82EXT supports all major PLC programming languages for maximum flexibility.

Controller Tasks and Program Capacity

• Maximum Controller Tasks: 32 tasks total.

• Maximum Programs per Task: 1000 programs.

• Task Types: Continuous, periodic, and event tasks.

• Event Triggers: All event triggers are supported.

• Program Organization: Structured for large applications.

• Execution Control: Priority-based task scheduling.

• Memory Management: Efficient allocation of 5 MB user memory.

• Scan Time: Optimized for high-speed control.

• Consequently, the 1756-L82EXT handles extremely complex, multi-program applications.

Installation Guide

First, verify that all system power sources are completely disconnected. Then, select an available slot in your ControlLogix-XT chassis. The Allen-Bradley 1756-L82EXT occupies only a single slot. After that, slide the controller module into the chosen slot. Push firmly until the backplane connector is fully seated. Next, connect your USB programming device to the USB port for initial configuration. Alternatively, connect to the embedded Ethernet port for network-based programming. Then, apply power to the ControlLogix-XT chassis. The controller will begin its power-up sequence. After that, observe that the conformal coating provides protection in harsh environments. For extended temperature operation, ensure the ambient temperature stays within -25°C to 70°C (independent) or -20°C to 70°C (with Flex I/O-XT devices). Then, download your control program using Studio 5000 software. Select your preferred programming language (relay ladder, structured text, function block, or SFC). Configure the appropriate communication networks (DeviceNet, DH+, RIO, SynchLink, or Ethernet). Finally, test all I/O connections and communication paths thoroughly. As a result, the Allen-Bradley 1756-L82EXT will provide reliable control in harsh environments.

Packaging List

• One Allen-Bradley 1756-L82EXT ControlLogix-XT 5580 controller module

• One product identification label

• One installation and configuration guide

• Conformal coating (applied at factory)

Common FAQs

Q1: How much user memory does the Allen-Bradley 1756-L82EXT provide?
A: This controller provides 5 MB of user memory. It also supports optional nonvolatile memory up to 20 MB. Therefore, it handles medium to large control applications effectively.

Q2: What is the difference between the 1756-L82EXT and standard ControlLogix controllers?
A: The 1756-L82EXT features conformal coating for environmental protection. It also has extended temperature ranges from -25°C to 70°C. Standard controllers lack this coating and have narrower temperature ranges.

Q3: What communication ports does the 1756-L82EXT have?
A: This controller has a built-in USB port for programming. It also has an embedded Ethernet port for networking. Additionally, it supports DeviceNet, Data Highway Plus, Remote I/O, and SynchLink networks.

Q4: What programming languages does the Allen-Bradley 1756-L82EXT support?
A: This controller supports Structured Text, Relay Ladder Logic, Sequential Function Chart, and Function Block Diagram. Therefore, it complies with IEC 61131-3 programming standards.

Q5: What are the temperature ratings for the 1756-L82EXT?
A: When used independently, the temperature range is -25°C to 70°C. When used with Flex I/O-XT devices, the range is -20°C to 70°C. Therefore, it suits extreme temperature applications.