The Honeywell Experion PKS C200 (Series A/B) represents a foundational generation of the Process Knowledge System, utilizing the ControlNet-based architecture. The system architecture is defined by the TC- and TK- prefix hardware, including Process Manager modules and specialized I/O interfaces housed in standard racks. Technical characteristics include deterministic communication over ControlNet, redundant controller configurations, and compatibility with legacy TDC 3000 field networks. Functionally, the C200 provides a robust execution environment for regulatory and sequence control logic. While succeeded by the C300 Series C, the C200 remains a vital component in many active plants, requiring genuine spare parts to maintain machinery protection and process stability.