Customs tariff classification turns on principal function, placing industrial controllers and control modules in Chapter 90 over Chapter 84.

For customs classification, goods with embedded data-processing capability are classified by their principal and specific function within the relevant functional unit. Controllers, including embedded Controllers and PACs, were treated as industrial process-control equipment rather than automatic data processing machines, and therefore fell under Chapter 90 instead of Chapter 84. I.O. Modules and Chassis, being integral components of a larger measuring and control system, were also classified as parts and accessories under Chapter 90. The governing principle is that data-processing features do not control classification where the dominant role is regulating or controlling industrial processes.

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Issues: (i) Whether the imported Controllers, including embedded Controllers and PACs, were classifiable as automatic data processing machines under Chapter 84 or as goods falling under Chapter 90 of the Customs Tariff Act, 1975; (ii) Whether the imported I.O. Modules and Chassis were classifiable as parts and accessories of regulating or controlling instruments and apparatus under Chapter 90.

Issue (i): Whether the imported Controllers, including embedded Controllers and PACs, were classifiable as automatic data processing machines under Chapter 84 or as goods falling under Chapter 90 of the Customs Tariff Act, 1975.

Analysis: The relevant tariff scheme required classification to be determined on the basis of the principal function of the machine and the nature of the functional unit. The Controllers were found to have a specialised structure and to be designed principally for industrial process control, executing control algorithms for real-time monitoring and control rather than merely processing data. The Chapter 84 note on machines performing a specific function and the Chapter 90 framework on regulating or controlling instruments showed that a machine incorporating data processing elements could still be classifiable by its specific control function. On the technical material, the Controllers were not merely PCs or ordinary ADPMs, but programmable process controllers intended for use with industrial process control equipment such as sensors, thermostats and similar apparatus.

Conclusion: The Controllers, including embedded Controllers and PACs, were not classifiable under Chapter 84 as ADPMs and were correctly classified under Chapter 90, in favour of Revenue.

Issue (ii): Whether the imported I.O. Modules and Chassis were classifiable as parts and accessories of regulating or controlling instruments and apparatus under Chapter 90.

Analysis: The I.O. Modules and Chassis were found to be tailored to specific industrial control functions and to operate as integral components of a larger measuring and control system. The technical material showed that the modules accepted and delivered signals to and from sensors and other devices, while the Chassis provided connectivity and housing for the controller and modules. Applying the concept of a functional unit, the package had to be viewed holistically, and the modules and chassis were not independent data-processing goods but components contributing to the specific controlling function. Accordingly, they fell within the parts-and-accessories structure of Chapter 90.

Conclusion: The I.O. Modules and Chassis were correctly classified as parts and accessories of regulating or controlling instruments and apparatus under Chapter 90, in favour of Revenue.

Final Conclusion: The tariff classification adopted by the Department was upheld, the Tribunal's contrary view was reversed, and the imported goods were held to fall within Chapter 90 rather than Chapter 84.

Ratio Decidendi: For customs classification, a machine or component incorporating data-processing capability must be classified according to its principal and specific function as part of a functional unit, and if its dominant role is industrial measuring or controlling rather than data processing, it falls under the appropriate Chapter 90 heading.

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