Table of Content
Complete Allen Bradley PLC Models List
Written by
Artur Solakhyan
Freelance copywriter and editor
Published at27 April 2026
Estimated reading time5 min read
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Allen-Bradley PLCs are among the most widely used control systems in industrial automation. Known for reliability, performance and integration capabilities, they support applications ranging from small standalone machines to large distributed control systems. This guide provides a comprehensive Allen-Bradley PLC models list, covering major PLC families, commonly used controllers and key modules. It also includes practical insights to help engineers and plant managers choose the right system based on application requirements, performance needs and long-term support considerations.
Allen Bradley PLC Families Overview
ControlLogix PLC Family
The ControlLogix platform represents the highest-performance segment of the Allen-Bradley PLC family. It is designed for large-scale industrial automation systems requiring high processing power, distributed control and advanced networking capabilities.
ControlLogix systems use a modular chassis-based architecture, allowing engineers to configure controllers, I/O modules and communication interfaces based on project requirements. These PLCs are widely used in process industries, large manufacturing plants and infrastructure systems where reliability and scalability are critical.
CompactLogix PLC Family
CompactLogix controllers are designed for mid-range applications, offering strong performance in a smaller footprint compared with ControlLogix. These controllers are part of the Logix platform and support modern industrial networking through EtherNet/IP.
CompactLogix systems are ideal for machine-level control, packaging lines and automated production systems that require flexibility and expansion capabilities without the complexity of larger platforms.
MicroLogix PLC Family
The MicroLogix series includes entry-level PLCs designed for small automation systems. These controllers are compact, cost-effective and suitable for standalone machines with limited I/O requirements.
While still widely used, MicroLogix PLCs are considered legacy systems and many models are approaching end-of-life status.
PLC-5 Family
The PLC-5 platform is one of the earliest Allen-Bradley PLC systems. It introduced modular control architectures and network communication capabilities for industrial automation.
Although many PLC-5 systems are still operational, they are considered legacy platforms and are often targeted for upgrades in modern facilities.
SLC 500 Family
The SLC 500 family served as a bridge between PLC-5 systems and modern Logix-based controllers. These PLCs are commonly found in older manufacturing setups and provide reliable control for medium-scale automation systems.
Popular Allen Bradley PLC Models
ControlLogix Popular Models
1756-L71
The 1756-L71 is a high-performance ControlLogix controller designed for complex automation systems. It offers fast processing speeds and supports multiple communication protocols, making it suitable for advanced industrial environments. It is often used in applications where real-time data processing and system coordination are critical.
1756-L73
The 1756-L73 provides larger memory capacity and enhanced performance compared with mid-range models. It is commonly used in large distributed systems requiring extensive data handling. Its increased memory supports more complex programs and higher data throughput.
Allen Bradley 1756-L61
The Allen Bradley 1756-L61 is a reliable mid-range ControlLogix controller. It balances performance and cost, making it suitable for many industrial applications. This model is frequently selected for systems that require stable operation without the need for maximum performance capacity.
CompactLogix Popular Models
1769-L33ER
The 1769-L33ER is a widely used CompactLogix controller featuring integrated EtherNet/IP communication. It is ideal for mid-size automation systems requiring reliable network connectivity. Its built-in communication capabilities simplify integration into modern control architectures.
1769-L24ER-QB1B
This CompactLogix model offers a compact design with integrated motion control capabilities, making it suitable for applications requiring coordinated movement. It is commonly used in machines where space constraints and motion precision are both important.
5069-L320ER
The 5069-L320ER represents the next generation of CompactLogix controllers, offering improved performance, enhanced communication capabilities and support for modern automation requirements. It is designed to meet the needs of evolving industrial systems that require higher efficiency and connectivity.
MicroLogix Popular Models
1766-L32BXB
This MicroLogix controller includes built-in I/O and is commonly used in standalone machines where compact design is important. It is well suited for applications with fixed control requirements and minimal expansion needs.
1761-L16BWA
A small-scale controller suitable for simple automation tasks, providing basic functionality at a low cost. It is typically used in entry-level applications where cost and simplicity are key factors.
1763-L16BBB
A flexible MicroLogix model that supports a range of small automation applications with moderate control requirements. It offers a balance between compact size and functional capability for basic systems.
PLC-5 and SLC 500 Examples
1785-L40B (PLC-5)
A classic PLC-5 controller used in large legacy systems. It remains in operation in facilities where long-term system stability is maintained.
1747-L552 (SLC 500)
A widely used SLC 500 processor for medium-scale automation systems. It is commonly found in older manufacturing environments with established control architectures.
1747-L542 (SLC 500)
A compact SLC 500 controller used in smaller industrial applications. It provides reliable performance for systems with moderate control requirements.
Extended Allen Bradley PLC Models List (Additional and Specialized Modules)
Communication, Memory and Specialized Modules
1771-RIO
The 1771-RIO module enables remote I/O communication in PLC-5 systems, allowing distributed control architectures. It supports communication between central processors and remote I/O racks in large systems.
1756-M22
The 1756-M22 is a ControlLogix memory module used to expand system storage capacity. It helps support applications that require additional data handling and program space.
1764-MM1RTC
The 1764-MM1RTC is a MicroLogix memory module with a built-in real-time clock for time-based operations. This feature allows accurate tracking of time-dependent processes.
Additional Industrial Modules and Components
Z809-E7
The Z809-E7 is used in specialized control applications requiring reliable performance. It is often applied in systems with specific operational demands.
Z809-E5
The Z809-E5 supports automation systems with specific operational requirements. It contributes to maintaining consistent system functionality.
Z600
The Z600 is another industrial component used in control systems. It is typically selected for applications requiring stable and dependable operation.
74100-070-08
The 74100-070-08 is used in industrial applications requiring precise control. It supports accurate system performance in demanding environments.
7300-UPW
The 7300-UPW supports power-related automation functions. It is commonly used where consistent power management is required.
74100-012-05
The 74100-012-05 is used in specialized automation configurations. It helps ensure stable operation in specific system setups.
How to Choose the Right Allen-Bradley PLC
Key Selection Criteria
Selecting the right PLC requires evaluating several technical factors:
- Number of I/O points required
- Processing speed and task complexity
- Memory capacity for program and data storage
- Communication protocols such as EtherNet/IP or ControlNet
- Environmental conditions including temperature and vibration
Understanding these factors ensures the selected PLC meets both current and future requirements.
Choosing Based on Application Type
Different applications require different PLC capabilities:
- Machine automation often uses CompactLogix controllers
- Process control systems benefit from ControlLogix platforms
- High-speed manufacturing requires advanced processing capabilities
- Distributed systems rely on scalable and network-integrated solutions
Legacy vs Modern Allen Bradley PLCs
Key Differences in Performance and Architecture
Legacy systems such as PLC-5 and MicroLogix differ significantly from modern Logix-based controllers. Modern systems offer higher processing speeds, better networking capabilities and improved integration with automation platforms.
When to Upgrade Legacy Systems
Upgrading becomes necessary when:
- Hardware reaches end-of-life
- System expansion is required
- Network integration becomes a priority
Migration Options to ControlLogix or CompactLogix
Migration to modern platforms typically involves upgrading to ControlLogix or CompactLogix systems. These platforms provide improved performance and long-term support within the Allen-Bradley product ecosystem.
Common Industrial Applications of AB PLCs
Manufacturing and Assembly Lines
PLCs control automated production lines, ensuring consistent operation and coordination between machines.
Food and Beverage Processing
In this industry, PLCs manage production processes, ensuring efficiency and product quality.
Automotive Production
Automotive plants rely on PLCs for robotic systems, assembly lines and quality control processes.
Oil and Gas Systems
PLCs are used to monitor and control critical operations in harsh environments.
Metallurgy and Heavy Industry
Heavy industrial processes require durable PLC systems capable of handling demanding conditions.
Where to Buy Allen Bradley PLC Models
Authorized vs Independent Distributors
Authorized distributors provide direct access to manufacturer-supported products, while independent suppliers may offer broader availability, including legacy components.
Sourcing Obsolete and Legacy PLC Models
Legacy systems often require sourcing discontinued parts. Working with experienced suppliers helps ensure availability and compatibility.
Requesting Quotes for Specific PLC Models
When sourcing PLCs, it is important to provide model numbers, quantities and application details. This helps suppliers recommend suitable solutions.
As a global industrial automation parts supplier, BSP Automation provides access to a wide range of Allen-Bradley PLCs and related components, including AB PLCs and accessories and other Allen-Bradley parts.
Conclusion
This Allen-Bradley PLC models list highlights the wide range of controllers available across different PLC families. From legacy systems like PLC-5 and MicroLogix to modern platforms like CompactLogix and ControlLogix, each solution serves a specific role in industrial automation.
Choosing the right PLC depends on system requirements, performance needs and long-term goals. Engineers should carefully evaluate their applications to select the most suitable controller.
For further insights, explore resources such as the Allen-Bradley PLC types guide and the Guide to AB drives to better understand how PLCs integrate into complete automation systems.
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