Why are modular ARM Embedded Controllers so important?

With the rapid development of industrial automation, building automation, energy management, and edge computing, ARM embedded controllers are evolving from single-purpose devices into general-purpose, scalable industrial control and edge computing platforms.

In this evolution, one trend is becoming increasingly clear:

ARM embedded controllers with selectable CPU, replaceable SoM, and configurable I/O modules are becoming the optimal solution for industrial applications.

This is not simply about offering more configurations—it represents a system-level design philosophy aimed at long-term deployment and complex, ever-changing industrial environments.

The Core Challenge of Industrial Applications: Highly Fragmented Requirements

Vast Differences in Computing Requirements Across Industries

In real-world projects, computing requirements vary significantly:

• Building automation, HVAC, and water treatment → Stability and communication capability are the priority; A53 / A55 CPUs are sufficient
• Protocol gateways, data acquisition, edge data processing → Require multi-core processing and higher I/O throughput
• AI vision, predictive maintenance, advanced analytics → Demand high-performance platforms such as RK3576 or RK3588

When the CPU is fixed:

• Insufficient performance → projects cannot be deployed
• Excessive performance → unnecessary cost, reduced competitiveness

A selectable CPU architecture enables a single platform to cover applications ranging from basic control to high-performance edge computing.

Rapid SoC Changes Make Traditional Board-Level Designs Risky

ARM SoCs now evolve faster than ever, while supply-chain uncertainty continues to increase:

• SoC end-of-life (EOL)
• Changes in DDR or Flash components
• Replacement of power management or peripheral ICs

In traditional designs where the CPU is tightly coupled to the mainboard:

• A single component change
• Can force a complete board redesign, re-certification, and software re-porting

By contrast, the SoM (System on Module) architecture dramatically reduces these risks:

• SoC, memory, and storage are integrated on the SoM
• The carrier board and I/O architecture remain unchanged
• Upgrades or replacements are achieved simply by swapping the SoM

Selectable and replaceable SoMs are the key to long-term supply assurance and continuous product evolution.

Configurable I/O Modules: The Key to Real-World Deployability

Industrial I/O Is Never a Fixed Combination

In real industrial projects, I/O requirements are often complex and diverse, such as:

• Multiple RS485 ports with CAN
• RS232 + CAN-FD + Ethernet
• DI / DO / AI / AO / RTD / TC
• PWM, pulse, and encoder signals

With fixed I/O:

• Many projects fall short by “just one or two interfaces”
• External expansion modules become necessary, increasing cost and failure points

A modular I/O design allows the controller to adapt to the field, rather than forcing the field to adapt to the controller.

Modular I/O Reduces Customization Cost and Improves Delivery Efficiency

Traditional hardware customization often means:

• Project-specific hardware development
• Fragmented BOMs
• Increased manufacturing and after-sales complexity

With modular I/O:

• The core platform remains unified
• I/O is configured on demand
• Mass production and fast delivery are maintained

This is not about increasing SKUs, but about:

Using a limited set of standardized modules to address a wide range of non-standard industrial requirements.

From an Engineering Perspective: A Sustainable Architecture

Long-Term Reuse of Software Assets

When CPU architectures are unified, SoM interfaces standardized, and I/O clearly abstracted:

• Linux / Ubuntu / Yocto
• BSPs and driver frameworks
• Node-RED, OpenPLC, Docker
• Upper-layer applications and algorithms

can be efficiently reused across multiple product generations and configurations.

Develop once, benefit for years—this is the foundation of engineering efficiency.

Smooth Upgrade Paths for Customer Solutions

A current project may use:

• A53 + RS485 + DI/DO

Future upgrades may involve:

• A higher-performance SoM
• AI cameras or industrial networks
• Expansion to EtherCAT or CAN-FD

All without redesigning the entire system architecture, protecting the customer’s investment and engineering experience.

ARMxy: An Engineering Implementation of a Modular ARM Edge Controller

ARMxy is a highly flexible modular ARM edge controller that supports selectable CPUs, SoMs, and I/O modules. Users can freely combine the appropriate modules according to specific application scenarios to build the most optimized solution.

In addition, ARMxy embedded controllers support flexible X-Board and Y-Board customization. Customers do not need to develop a completely new hardware platform. Instead, low-cost board-level customization is sufficient to meet specific interface or functional requirements, resulting in:

• Significantly reduced hardware development costs
• Shorter project delivery cycles
• Improved scalability and solution reusability

This approach allows ARMxy to combine the stability of standardized products with the flexibility of customized solutions.

Conclusion

The greatest challenges in industrial control systems are not simply about performance, but about:

• Diverse application scenarios
• Rapidly changing requirements
• Long project life cycles
• Uncertain supply chains

An ARM embedded controller with selectable CPU, replaceable SoM, and configurable I/O modules addresses these challenges through modularity and standardization.

It is not designed for a single project, but for countless future projects.