Description

The Allen-Bradley 1756-L81E is a ControlLogix 5580 Programmable Automation Controller designed for high-performance industrial automation, discrete control, and motion control applications. Built on Rockwell Automation's ControlLogix platform, the controller integrates directly into any standard 1756 chassis slot to execute high-speed control logic and system-wide communications across automated facility operations.

Equipped with 3 MB of user memory, an embedded gigabit Ethernet port, and a USB 2.0 programming port, the 1756-L81E provides high-speed execution for processing complex control tasks. The embedded Ethernet interface supports communication speeds of 10/100/1000 Mbps and enables direct connection to EtherNet/IP devices without requiring a dedicated communication bridge module in the local chassis.

The controller features an integrated 4-character alpha/numeric display for real-time status indication, diagnostic alerts, and system monitoring. Designed without a battery, the module utilizes an embedded, non-removable energy storage module to back up user memory alongside the factory-installed 2 GB Secure Digital (1784-SD2) nonvolatile memory card.

Features

• Embedded High-Speed Network Interface: Includes a front-facing 1 Gbps (10/100/1000 Mbps) Ethernet port supporting up to 100 EtherNet/IP nodes (with Studio 5000 Logix Designer version 30 or later).
• Integrated Processing & Memory: Offers 3 MB of user memory with capacity for up to 32 tasks (continuous, periodic, and event) and up to 1,000 programs per task.
• High Data Throughput: Delivers up to 128,000 I/O packets/second (Class 0/1) without CIP Security, supporting demanding industrial communication tasks.
• Battery-Free Energy Storage: Integrates an embedded, non-removable capacitor energy storage module rated for 80,000 power cycles, eliminating routine battery replacement maintenance.
• Local Maintenance Port: Features a USB 2.0 full-speed (12 Mbps) interface dedicated to local programming, system configuration, firmware upgrades, and online logic editing.
• Visual System Diagnostics: Equipped with a 4-character alphanumeric display providing visual monitoring for operational state, network status, and error diagnostic codes.
• Broad Network Compatibility: Supports EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, and SERCOS communication options when paired with chassis-based network modules.

Applications

• High-Speed Machine Control: Executes high-speed logic, sequencing, and motion control for automated assembly lines and packaging machinery.
• Distributed Control Architecture: Acts as the central processing unit controlling remote I/O drops, drive systems, and field instrumentation across an EtherNet/IP network.
• Integrated Motion Systems: Manages drive-based motion tasks using Integrated Motion on EtherNet/IP or SERCOS communication interfaces.
• Process & Batch Operations: Handles discrete and hybrid process tasks, supporting ladder logic, structured text, function block diagrams, and sequential function charts.

Technical Specifications

General

Electrical

Performance & Communication

Environmental

Connections / Interfaces

Installation Guidelines

1. Chassis Verification: Ensure the target ControlLogix 1756 chassis (e.g., 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17) and power supply are unpowered prior to inserting or removing the controller.
2. Module Insertion: Align the controller board circuit card with the chassis guides in the desired slot. Slide the module into the chassis until the top and bottom levers latch securely into place.
3. Network Cabling: Connect an RJ45 Ethernet cable (compliant with IEC 61918 and IEC 61784-5-2 guidelines) to the front gigabit Ethernet port for system networking.
4. Local Connection Restrictions: Use the front USB port strictly for temporary commissioning and programming. Do not use the USB interface for permanent connections or in classified hazardous locations.
5. Grounding Verification: Confirm that the chassis mounting frame is bonded to central functional ground following standard industrial wiring and grounding practices (Rockwell Automation publication 1770-4.1).

Configuration Guidelines

1. Software Environment: Configure and program the controller using Studio 5000 Logix Designer software. Verify software version compatibility to support targeted node capacity (version 30 or later required for up to 100 EtherNet/IP nodes).
2. IP Address Assignment: Assign a valid network IP address to the embedded Ethernet port using BOOTP/DHCP Server tools or via the Studio 5000 project properties.
3. Nonvolatile Storage: Verify that the included 1784-SD2 Secure Digital card is correctly seated in the controller slot to allow automated user program and tag data backup.

Compliance and Certifications

• c-UL-us: UL Listed Industrial Control Equipment (UL File E65584); UL Listed for Class I, Division 2 Group A,B,C,D Hazardous Locations (UL File E194810).
• CE: Compliant with European Union 2014/30/EU EMC Directive (EN 61326-1, EN 61000-6-2, EN 61000-6-4, EN 61131-2).
• Ex / ATEX: Compliant with EU 2014/34/EU ATEX Directive (EN IEC 60079-0, EN IEC 60079-7, II 3 G Ex ec IIC T4 Gc, UL 22 ATEX 2817X).
• IECEx: Certified to IEC 60079-0, IEC 60079-7 (Ex ec IIC T4 Gc, IECEx UL 22.0062X).
• UKCA / UKEx: Compliant with UK Electromagnetic Compatibility and UKEx Regulations (UL22UKEX2601X).
• CCC: Certified under CNCA-C23-01 Explosion-Proof Electrical Products (Certificate 2020122309111998).
• EtherNet/IP & CIP Security: ODVA conformance tested for EtherNet/IP and CIP Security.
• Cyber Security: TÜV certified for security compliance under IEC 62443-4-2 SL1.
• Other: RCM (Australia), KC (Korea), Morocco.