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Product Name:​ MC-PAIH03 High Level Analog Input (HLAI) Processor Module

Introduction:​ The 51304754-150 (MC-PAIH03) is a high-level analog input processor for Honeywell TDC 3000 and Experion PKS systems. It performs high-precision acquisition of 4–20 mA, voltage, and other high-level analog signals from field transmitters and sensors. The module is now discontinued by the original factory and circulates as industrial spare parts.

Product Name:​ UCN / TDC 3000 Digital Input Module (24 VDC)

Introduction:​ The 80363972-150 is a high-density digital input module for the Honeywell TDC 3000 and Experion PKS distributed control platforms. Supplier listings describe it with either 16 or 32 input channels; the -150 hardware revision features updated conformal coating and enhanced EMI shielding versus earlier -100 and -125 suffixes, making it suitable for high-humidity and electrically noisy environments.

The Honeywell 51304542-100 is an industrial-grade PCB control board for the TDC 3000 / TPN system. It acts as a key I/O control interface, handling communication between logic control signals and field devices via the LCN (Local Control Network) proprietary bus protocol. Publicly available documentation shows slight variation in categorization—some references classify it as a "KLCN I/O Control Board," while others describe it as an "LCN A Cable Interface Converter Board." Both descriptions point to the same core function: LCN-bus-based interface/conversion for TDC 3000.