CompactLogix vs. MicroLogix: What Is the Difference?
In the world of industrial automation, selecting the right Programmable Logic Controller (PLC) is a decision that can impact your operation’s efficiency, scalability, and long-term success. Two of the most common Allen-Bradley PLC families from Rockwell Automation CompactLogix and MicroLogix often come up in these discussions.
But what exactly sets them apart? This guide provides a side-by-side comparison of CompactLogix vs. MicroLogix, helping you make the right choice for your application.
What Is a CompactLogix Controller?
CompactLogix is a mid-tier PLC system within the Logix 5000 family. It’s designed to bridge the gap between small standalone machines and large, complex processes that traditionally use ControlLogix systems.
Key Features:
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Programming: Uses Studio 5000 Logix Designer, the same as ControlLogix.
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Network Integration: Supports EtherNet/IP, DeviceNet, and ControlNet.
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Scalability: Supports distributed I/O, motion, safety, and drive control.
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Applications: Ideal for packaging, robotics, and process automation.
CompactLogix controllers are widely adopted in industries that require high-speed control, robust networking, and room to scale over time.
What Is a MicroLogix Controller?
MicroLogix PLCs are Allen-Bradley’s legacy solution for simple, cost-sensitive automation tasks. They’re ideal for applications that don’t require the performance or scalability of a Logix platform.
Key Features:
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Programming: Uses RSLogix 500 (similar to SLC 500).
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Communication: Offers RS-232, RS-485, and some EtherNet/IP support (MicroLogix 1400).
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Compact Design: Built-in I/O, ideal for standalone machines.
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Applications: Best for water treatment, building automation, HVAC, and small machinery.
Side-by-Side Comparison: CompactLogix vs. MicroLogix
| Feature | CompactLogix | MicroLogix |
|---|---|---|
| Platform | Logix 5000 | Legacy (SLC/Micro) |
| Programming Software | Studio 5000 Logix Designer | RSLogix 500 |
| Networking | EtherNet/IP, ControlNet, DeviceNet | RS-232, RS-485, EtherNet/IP (1400 only) |
| I/O Scalability | High (supports local and distributed I/O) | Limited (fixed or small expandable I/O) |
| Motion Control | Integrated with Kinetix drives | Not supported |
| Safety Integration | Supported (with 5380/5370 controllers) | Not supported |
| Typical Application Size | Medium to large | Small |
| Price Point | Moderate to high | Entry-level, budget-friendly |
| Form Factor | Modular or rack-style | Compact all-in-one |
Which One Is Right for You?
Choose CompactLogix if you:
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Need high-speed processing and advanced logic
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Plan to integrate motion, safety, or drives
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Require scalable architecture across multiple machines
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Use modern Rockwell engineering tools (Studio 5000)
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Need robust network communication
Choose MicroLogix if you:
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Have a simple machine or standalone control system
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Want a cost-effective PLC with basic features
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Prefer minimal programming and hardware setup
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Work within a legacy SLC500 environment
Use Cases in the Field
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CompactLogix 5370 L2 is ideal for packaging lines with high-speed conveyors and integrated servo motors.
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MicroLogix 1400 fits perfectly in municipal water systems with basic level and pump control, offering Ethernet/IP for remote monitoring.
For more information, contact PLG Automation:
Email: sales@plgautomation.com
Phone: 800-906-9271