In today’s automation landscape, engineers and OEMs face more flexibility than ever when designing control architectures. But with flexibility comes choice—and one of the most important decisions is whether to use a chassis-based solution (also known as modular or rack-mounted systems) or a board-level solution (embedded control).
Each architecture has distinct advantages, limitations, and best-use scenarios. Understanding the trade-offs is essential to building systems that are not only functional, but scalable, serviceable, and cost-effective.
What Is a Chassis-Based Solution?
A chassis-based system consists of a backplane or rack that houses modular components such as:
- CPU/controller modules
- I/O cards
- Motion control cards
- Communication interfaces
- Power supplies
Examples:
- Allen-Bradley ControlLogix / CompactLogix
- Siemens S7-1500
- Beckhoff CX series with I/O terminals
These systems are widely used in industrial automation environments where:
- Multiple axes of motion need coordination
- Machine functions are distributed across various subsystems
- Centralized processing and unified software environments are preferred
What Is a Board-Level Solution?
A board-level solution refers to control or motion components implemented as bare printed circuit boards (PCBs) that integrate directly into an OEM’s hardware. These often include:
- Servo drives in PCB format
- Embedded motion controllers
- Integrated control boards designed for specific machinery
Examples:
- ADVANCED Motion Controls’ µZ series (micro-sized drives)
- Trinamic board-level stepper drivers
- Custom PCBs with motion ICs embedded
These are often used in:
- Compact machines with space constraints
- Cost-sensitive high-volume OEM designs
- Products where electronics are enclosed within proprietary housings
Chassis vs. Board-Level – Feature Comparison
| Feature / Criteria | Chassis-Based Solutions | Board-Level Solutions |
|---|---|---|
| Integration Level | Modular, external components | Embedded directly in product design |
| Ease of Use | Plug-and-play, software-supported | Requires electrical and firmware expertise |
| Flexibility | High—easy to swap, add, or replace | Low—fixed design, harder to reconfigure |
| Serviceability | Easy to troubleshoot & replace modules | Repairs often require board-level access |
| Scalability | Excellent for expanding I/O or motion | Limited to fixed design specs |
| Footprint | Larger panel or enclosure required | Ultra-compact; ideal for space-limited apps |
| Cost per Unit | Higher upfront; better long-term ROI | Lower BOM in high volumes |
| Development Time | Faster to deploy | Longer NRE, but optimized at scale |
| Environment | Designed for harsh, industrial settings | Often requires additional protection |
When to Choose a Chassis-Based System
Chassis-based systems are ideal for:
- Industrial automation cells or line control
- High-axis count motion systems
- Environments requiring safety, redundancy, or fieldbus communication
- Teams that prioritize standardization, ease of support, and serviceability
Best fit for:
- Factory automation integrators
- High-value capital equipment OEMs
- Users of Rockwell, Siemens, Beckhoff, etc.
When to Choose a Board-Level Solution
Board-level systems excel in:
- Compact, embedded equipment
- High-volume OEM designs where cost per unit matters
- Applications where custom enclosures already exist and space is at a premium
Best fit for:
- Robotic arms, compact AGVs, lab automation equipment
- Startups or OEMs needing sleek, integrated packaging
- Systems that don’t require frequent field service
🛠 Examples in Motion Control Applications
| Application | Preferred Solution | Why? |
|---|---|---|
| Conveyor cell with 8 motors | Chassis-based | Centralized control, ease of expansion |
| Desktop 3D printer | Board-level | Low cost, integrated into small enclosure |
| High-speed pick-and-place | Chassis-based | Multi-axis sync, diagnostics, feedback |
| Compact pipetting robot | Board-level | Space-limited, high-volume build |
Final Thoughts: Hybrid Models Are Emerging
It’s worth noting that the line between these solutions is blurring:
- Some chassis-based systems now offer embedded modules with custom I/O.
- Some board-level components include network interfaces, making them easier to integrate.
At AutoMotion Dynamics, we work with both styles—helping customers:
- Evaluate motion control architectures
- Source compatible components
- Balance flexibility, cost, and manufacturability
📞 Need Help Choosing the Right Architecture?
Whether you’re scaling an industrial line or developing your next compact OEM system, we can help you weigh the trade-offs and find the best path forward.
Contact us to discuss your project requirements or request product recommendations.