Product Overview

The Allen-Bradley 1768-L43 is a high-performance CompactLogix™ controller engineered for mid-range industrial automation and integrated motion applications. As part of the Logix5343 family, this processor bridges the gap between standard PLC control and high-speed motion synchronization. It is specifically designed to work with the 1768 backplane, allowing for the addition of 1768 communication modules (such as EtherNet/IP or ControlNet) and up to 16 local 1769 Compact I/O™ modules.

Equipped with 2 MB of built-in volatile user memory, the 1768-L43 supports complex control algorithms and extensive data logging. It utilizes the Logix control engine, providing a common programming environment and multidiscipline control—including discrete, motion, and process control—within a single compact chassis.

Technical Specifications and Hardware Features

The 1768-L43 provides robust processing power and flexible expansion options for demanding factory floor environments.

• User Memory: 2 MB (Non-volatile storage available via optional 1784-CF CompactFlash card)

• I/O Capacity: Supports up to 16 local 1769 I/O modules across 3 expansion banks

• Integrated Motion: Supports up to 4 axes of integrated motion control

• Programming Languages: Fully compatible with Relay Ladder Logic, Structured Text, Function Block Diagram, and Sequential Function Chart (SFC)

• Communication Ports: Built-in RS-232 serial port (DF1, DH-485, ASCII protocols)

• Power Consumption: 31.3 Watts maximum

• Backplane Current: 1.3A at 24V DC

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

• Physical Dimensions: 13.2 x 9.0 x 12.2 cm (Standard 1768 form factor)

Key Performance Characteristics

• Multidiscipline Control: The Logix5343 engine allows for the simultaneous execution of safety, motion, and sequential logic, reducing the need for multiple specialized controllers.

• Scalable Communication: By utilizing 1768-series communication modules, the L43 can participate in high-level Ethernet/IP networks for enterprise-wide data exchange or ControlNet for deterministic I/O control.

• Redundant Data Security: The front-panel mode switch provides physical security for program logic (Run/Program/Remote), while the support for CompactFlash cards ensures easy firmware updates and non-volatile program backup.

• Flexible Installation: Supports both DIN rail and panel mounting, with a modular design that allows for vertical or horizontal orientation to fit restricted enclosure spaces.

• Real-time Diagnostics: Integrated status LEDs provide immediate visual feedback on controller health, I/O status, and communication activity, simplifying troubleshooting and maintenance.