Standalone machine control sounds straightforward until you're staring down a panel design that has to balance I/O requirements, communication protocols, motion capability, and budget all at once. Choose a controller that's underpowered, and you'll be working around its limitations for the life of the machine. Choose one that's overbuilt, and you've spent money on capability you'll never use. For engineers and machine builders specifying PLCs for standalone applications, that middle ground can be surprisingly hard to find.
At HESCO, we work with Allen-Bradley automation products every day, and one product line we recommend for standalone machine control is the Micro800 series from Rockwell Automation. This article breaks down what the Micro800 platform is, how it's built, and what capabilities it brings to the table so you can walk into your next project with a clear picture of what this family offers before you start narrowing down which specific model fits your application.
Here's the short version: the Micro800 is a scalable, modular PLC family designed specifically for standalone machines. It comes in four controller tiers, supports a wide range of communication protocols, and uses a plug-in and expansion I/O architecture that lets you build out exactly the functionality you need without paying for what you don't. Both of Rockwell's primary programming environments support it, and the platform is designed for code reuse across machine models.
The Micro800 family is Allen-Bradley's answer to standalone machine control—applications where you need a capable, self-contained controller that doesn't require the overhead of a full ControlLogix or CompactLogix system. Think packaging equipment, material handling, pumping systems, food processing lines, HVAC and building management, and any machine that needs to operate independently or communicate with a broader network without being tightly integrated into a Logix-based architecture.
The platform spans four controller models: the Micro810, Micro820, Micro850, and Micro870, each optimized for a different range of applications and I/O requirements. A separate article covers how to choose between them in detail, but the key point here is that all four share a common programming environment, common plug-in modules, and common accessories. That consistency means your engineering team isn't starting from scratch every time the application changes.
The defining design philosophy of the Micro800 line is modularity. Rather than buying a fixed-feature controller and accepting whatever it comes with, the platform is built around two expansion mechanisms:
Both module types use removable terminal blocks, which matters more than it might seem; it dramatically reduces wiring time during installation and simplifies maintenance when a module needs to be swapped in the field.
The Micro800 family supports a broad set of protocols, which is one of the reasons it works well in both pure Allen-Bradley environments and mixed-vendor installations:
The Micro800 platform includes embedded motion capability via pulse train output (PTO) on the Micro850 and Micro870. The Micro850 supports up to three axes of motion, while the Micro870 supports up to two. Both use PLCopen-compliant motion instructions, which reduces the learning curve for engineers already familiar with Logix-based motion programming.
For applications that need encoder feedback or higher-precision position registration, the motion high-speed counter plug-in supports pulse frequencies up to 250 kHz and includes touch probe support for accurate position registration without external hardware.
All Micro800 controllers are programmed using one of two software platforms:
Both environments support Logix Theme programming, which allows engineers to work in familiar Logix-style instruction naming and copy ladder logic directly between CCW and Studio 5000 Logix Designer, a practical time-saver on projects that involve both controller platforms.
The Micro800 is a well-thought-out platform for standalone machine control—modular enough to avoid over-specifying, capable enough to handle real applications, and consistent enough across the family to support code reuse and standardization. For teams that live in the Allen-Bradley ecosystem, it fits cleanly alongside existing Logix infrastructure. For mixed-vendor environments, its protocol flexibility makes integration manageable.
If you're evaluating the Micro800 for an upcoming project or want to understand which model and configuration fits your specific application, the HESCO team is ready to help. Contact us today to talk through your requirements with an automation specialist who knows this product line inside and out. Or check out this article comparing the four models of the Micro800 series.