1756-L85E
1756-L85E - 40MB ControlLogix 5580 PLC | Allen-Bradley
The Allen-Bradley 1756-L85E is a ControlLogix 5580 programmable logic controller with 40 MB of user memory, a USB port, one 1 Gb embedded Ethernet port, support for up to 300 EtherNet/IP devices, and a four-character alphanumeric display. It belongs to the Allen-Bradley ControlLogix family and is intended for industrial machine control, factory automation, process control, and networked manufacturing equipment. The processor combines structured logic, motion, communications, and EtherNet/IP connectivity in one controller platform.
A programmable logic controller, or PLC, is an industrial computer that executes user-defined control logic and coordinates sensors, actuators, drives, safety systems, and factory communications. The ControlLogix platform provides shared memory and a modular architecture, allowing designers to configure a controller for deterministic machine automation rather than a simple standalone relay sequence. The 1756-L85E is suited to applications requiring substantial program and data capacity together with embedded network connectivity.
The verified product data identifies 40 MB user memory, one USB port, one 1 Gb Ethernet port, support for 300 EtherNet/IP devices, and a four-character alpha/numeric display. The USB port provides a convenient connection point for compatible engineering, maintenance, or device services, while the Ethernet port supports industrial network integration. The display gives technicians basic visible status information without requiring a separate local interface.
ControlLogix controllers are used when an automation system needs more than basic discrete I/O. Typical machine builders use the platform for sequencing conveyors, coordinating variable-frequency drives, handling analog process variables, and communicating with remote I/O or operator-interface devices. EtherNet/IP connectivity allows the controller to participate in industrial networks carrying coordinated control and diagnostic information rather than operating only as an isolated controller.
System design should account for the 1756 chassis, compatible 1756 I/O modules, power supply, network configuration, controller capacity, firmware selection, and required expansion modules. Firmware availability is an important lifecycle consideration because controller, service-tool, and network compatibility can depend on the installed firmware release. The manufacturer product page lists firmware for the 1756-L85E, including version information shown in the verified source.
This page combines the verified Rockwell Automation product and distributor information with practical selection guidance. It emphasizes the controller's verified capacity, connectivity, communication scale, and industrial-control role while avoiding unsupported electrical, environmental, or mechanical claims. Confirm current pricing, stock, firmware, and system compatibility with Rockwell Automation or an authorized distributor before purchasing or replacing an installed processor.
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