Description

The Allen-Bradley 1756-L85E is a ControlLogix 5580 Programmable Automation Controller engineered to deliver high-capacity processing, real-time control, and integrated communication within the Allen-Bradley ControlLogix system architecture. Operating as a high-performance CPU module inside a standard or extreme-environment 1756 chassis, the 1756-L85E coordinates complex discrete, motion, and process control tasks across demanding industrial environments.

Featuring high-density program storage and multi-tasking execution, the 1756-L85E controller supports up to 32 distinct tasks with up to 1000 programs per task. The unit features an embedded 1 Gb Ethernet port (supporting 10/100/1000 Mbps operation) for network integration, motion control, and distributed I/O communication, alongside an onboard USB port for local engineering maintenance and programming.

Designed for flexible deployment in industrial backplanes, the module operates without local I/O event trigger limitations and includes a front-panel 4-character diagnostic display for real-time status monitoring. An included 2 GB Secure Digital (SD) card (1784-SD2) provides optional nonvolatile memory to store program code, tag metadata, and backup configurations.

Features

• High-Capacity Task Execution: Supports up to 32 independent tasks and up to 1000 programs per task to handle large-scale automation routines.
• Gigabit Ethernet Connectivity: Features an onboard RJ45 Ethernet port supporting 10, 100, and 1000 Mbps speeds for deterministic system-wide networking.
• Integrated Motion Capabilities: Enables Motion over EtherNet/IP for up to 256 axes via the embedded high-performance Ethernet port.
• Local Maintenance Interface: Equipped with a USB port offering up to 12 Mbps transfer rates for temporary programming and diagnostic access.
• Nonvolatile Data Backup: Ships with a preinstalled 1784-SD2 2 GB SD card for secure user program and tag data storage.
• Real-Time System Diagnostics: Front-panel 4-character LED display and status indicators enable instant operational verification and fault isolation.
• Unrestricted Local Event Triggers: Operates without limit on local I/O event triggers to maximize real-time processing responsiveness.

Applications

• High-Speed Discrete Manufacturing: Fast execution of complex logic and motion routines in automated assembly, packaging, and material handling systems.
• Distributed Motion Control: Coordination of multi-axis drives over EtherNet/IP networks without dedicated motion interface modules.
• Process Automation & DCS Integration: Centralized logic processing and continuous control within plant-wide ControlLogix platform architectures.
• High-Density I/O Networks: Large-scale data acquisition and control across distributed Ethernet, ControlNet, and DeviceNet remote I/O nodes.

Technical Specifications

General

System Performance & Memory

Electrical & Power Ratings

Communication Interfaces

Environmental Ratings

Connections / Interfaces

Installation Guidelines

1. Electrostatic Discharge (ESD) Protection: Always wear an approved grounding wrist strap and handle the controller circuit board only by its housing to prevent static damage to internal components.
2. Chassis Compatibility Check: Ensure the host 1756 ControlLogix chassis and power supply are installed and powered down before insertion. Note that operation up to 60 degC requires a Series C chassis.
3. Physical Mounting: Align the top and bottom circuit board guides with the chosen slot in the 1756 backplane and slide the module firmly until it latches flush with adjacent units.
4. Memory & Key Initialization: Confirm the 1784-SD2 card is properly seated in its slot behind the front door and insert the 1756-KY1 mode switch key.
5. Network Cabling: Connect standard Category 5e/6 shielded Ethernet cabling to the onboard RJ45 port following IEC 61918 industrial wiring practices.

Configuration Guidelines

1. Firmware Matching: Verify and match controller firmware revisions using Rockwell Automation Product Compatibility and Download Center (PCDC) prior to commissioning.
2. IP Address Assignment: Set the Ethernet port IP configuration using RSLinx Classic or Studio 5000 Logix Designer software.
3. USB Usage Limits: Restrict USB port connections to temporary local maintenance using un-hubbed cables shorter than 3.0 meters (9.84 ft).
4. Program Backup: Write final application logic and tag databases to the nonvolatile 2 GB SD card to ensure rapid restore capability after power cycles.