Product Overview

The Allen-Bradley 1756-L71 is a high-performance ControlLogix 5571 processor designed for scalable and integrated control in complex industrial environments. As a core component of the ControlLogix platform, this controller provides a unified engine capable of managing discrete, motion, process, and high-availability applications. It utilizes a multi-processor architecture to balance control tasks and communication overhead, ensuring high-speed data throughput and deterministic performance across the backplane.

Designed for longevity and reliability, the 1756-L71 is an active product within the Rockwell Automation lifecycle, offering a robust solution for plants requiring precise coordination of I/O and motion axes.

Technical Specifications and Features

The 1756-L71 is engineered with advanced diagnostic capabilities and memory management to support demanding automation logic.

• User Memory: 2 MB of onboard volatile memory for application code and data.

• I/O Memory: 0.98 MB dedicated to I/O data processing.

• Communication Interface: Integrated USB 2.0 port for local programming, configuration, and firmware updates.

• Diagnostic Display: Built-in 4-character alphanumeric display providing real-time status codes, system errors, and initialization feedback.

• Controller Connections: Supports up to 500 total connections.

• Digital I/O Support: Capable of managing up to 128,000 maximum digital I/O points.

• Analog I/O Support: Capable of managing up to 4,000 maximum analog I/O points.

• Programming Languages: Full support for Relay Ladder Logic (RLL), Structured Text, Function Block Diagram (FBD), and Sequential Function Chart (SFC).

• Energy Storage: Features an energy storage module, eliminating the requirement for lithium batteries.

Operational Environment and Physical Data

• Module Type: Programmable Automation Controller (PAC)

• Chassis Compatibility: Installs into any slot of a 1756 ControlLogix I/O chassis.

• Weight: Approximately 0.4 kg (0.88 lbs).

• Dimensions: 3.5 x 14.0 x 14.5 cm.

• Operating Temperature: 0 to 60 °C (32 to 140 °F).

• Enclosure Rating: Open-style (must be installed in a protected industrial cabinet).

• Origin: United States of America.