Allen-Bradley CompactLogix: 1769/1768 Series

The Allen-Bradley CompactLogix 1769/1768 Series stands as a mid-range Programmable Logic Controller (PLC) system tailored for machine and process control applications. It strikes a balance between processing power, flexibility, and affordability compared to high-end PLC options. Here's an in-depth overview of the 1769/1768 CompactLogix:

Modular Design:

At the heart of the system lies the 1769 processor, available in various models offering different processing power and memory capacity. Expansion is facilitated through 1768 I/O modules that snap onto the backplane, enabling customization to suit specific needs such as digital I/O, analog I/O, and communication modules.

  • Built-in Communication: The CompactLogix features built-in communication capabilities, typically including Ethernet/IP, facilitating seamless integration with other devices and controllers. This enables data exchange and centralized control within your automation system.
  • Motion Control Capabilities (1768 Only): While not universal across all models, the 1768 controller variant offers integrated motion control features. This renders it suitable for applications involving coordinated movement of motors and actuators, such as packaging lines or robotic systems.
  • Programming Versatility: Programming the CompactLogix is accomplished using Rockwell Automation's renowned RSLogix 5000 software, offering a familiar environment for those accustomed to the SLC 500 platform. Additionally, it supports other languages like Structured Text to accommodate more advanced programming requirements.


The 1769/1768 CompactLogix finds application across various industrial automation tasks, including:

  • Machine control: Conveyor systems, material handling, assembly lines.
  • Process automation: Control of pumps, valves, and other process equipment.
  • Building automation: HVAC control, lighting control, building security.
  • Data acquisition and monitoring: Collection and analysis of data from sensors.

Comparison with SLC 500: While both are esteemed mid-range PLCs from Allen-Bradley, the CompactLogix presents several advantages, including:

  • More powerful processors capable of handling complex control logic.
  • Built-in communication capabilities.
  • Integrated motion control option (1768 only).

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