TRi FX1616-BA PLC Shifts to Surface-Mount Manufacturing

The industrial control landscape rarely shifts overnight, yet even mature PLC platforms evolve quietly behind the scenes. Triangle Research International (TRi) has introduced a manufacturing update for its FX1616-BA PLC, transitioning key internal circuitry to surface-mount technology. The move targets long-term availability, production efficiency, and reduced exposure to legacy component shortages.

This redesign does not alter the controller’s functional capabilities. Instead, it focuses on how the electronics are built, signaling a manufacturing strategy shift rather than a product replacement.

A manufacturing shift hidden in plain sight

At first glance, the FX1616-BA retains its familiar open-board industrial layout and I/O configuration. However, the internal PCB architecture now reflects a broader industry trend toward surface-mount assembly.

This transition improves manufacturability while preserving system compatibility. It also allows TRi to stabilize supply chains for long lifecycle automation deployments.

The open-board structure of FX1616-BA reflects its design focus on accessibility and building automation integration.

What actually changes inside the FX1616-BA

The core update lies in the migration from through-hole assembly to surface-mount device (SMD) placement. This change reshapes how components are mounted on the PCB without altering system logic or interfaces.

Surface-mount versus traditional assembly

Surface-mount technology enables components to sit directly on the PCB surface. This reduces mechanical stress points and improves automation in manufacturing.

Through-hole designs require drilled PCB vias and component leads inserted through the board. That approach increases production time and limits board density in compact controllers.

Despite internal manufacturing changes, the FX1616-BA maintains its I/O density and Ethernet-enabled communication design.

System consistency remains unchanged

All functional parameters remain stable. I/O configuration, communication protocols, and physical dimensions stay identical to previous versions.

This ensures full compatibility for replacement scenarios in installed building automation systems.

Where this PLC continues to fit in modern control architectures

The FX1616-BA continues to serve OEM-driven building automation projects where system customization is essential. Its I/O structure and communication flexibility support HVAC, energy monitoring, and facility automation workflows.

Support for Modbus TCP, RS485, and RS232 enables integration into both legacy and modern industrial networks.

In many engineering evaluations, controllers are no longer assessed in isolation. Selection often expands toward broader PLC and PAC systems portfolios, where engineers compare architecture families, scalability, and lifecycle support across multiple platforms to ensure long-term system alignment in automation projects.

These system-level comparisons typically extend into full platform reviews such as PLC and PAC systems, especially when projects require cross-vendor compatibility or long lifecycle spare strategy planning.

Why this manufacturing shift matters

Component obsolescence continues to challenge industrial lifecycle planning. PLC systems often remain in service for decades, far beyond consumer electronics cycles.

Surface-mount adoption reduces reliance on legacy through-hole components that gradually disappear from semiconductor supply chains. This improves long-term production stability and replacement availability.

A practical engineering perspective

This update does not change how the FX1616-BA performs in real applications. However, it strengthens its manufacturing resilience and long-term supply security.

In industrial control design, production architecture often matters as much as functional capability. TRi’s move reflects a long-term strategy focused on lifecycle assurance rather than feature expansion.

Author: Daniel Mercer, Industrial Analyst — 14 years of experience in industrial automation systems with field and integration background across Rockwell Automation, Siemens PLC deployments, and Emerson process control environments.