Product Details：

Honeywell 51108899100 (51108899-100) is a TDC300 paddle termination board designed for Honeywell TDC300 legacy DCS system,its main purpose of reliable signal transition and field breakout between Data Hiway interface module and individual field instrument cables. This paddle board is installed inside the remote I/O expansion rack,acting as the intermediate signal transfer carrier between the backplane bus and external field terminal cables. It splits the bundled multi-channel signals from the DHI module into independent terminal points for pressure,temperature,flow,level analog transmitters and digital contact signals such as limit switches and emergency interlock contacts. It is equipped with built-in transient voltage suppression and channel isolation circuits on each signal path,which can effectively block the surge and static interference from long field instrument cables,preventing expensive core communication modules from being damaged by miswiring and short circuit during loop commissioning and maintenance. It follows fixed slot address mapping rules consistent with TDC300 IOP configuration. Engineers can perform point-by-point signal injection testing and loop fault checking conveniently without removing the main I/O module. It can detect abnormal states such as open circuit,short circuit and loose terminal connection,recording timestamped fault logs and uploading alarm information to the DHI module and upper LCN network for maintenance prompt and fault tracing. It is a classic spare transition board for old TDC300 projects,matched with 51107403100 LCN adapter board and various analog and digital I/O modules.

Key specifications：Standard rack plug-in board structure for TDC300 chassis,cooperates with Data Hiway Interface module for signal distribution. Operating temperature range is 0°C to +60°C. It supports wire break,short circuit and terminal loose connection fault diagnosis. The PCB is conformal coated for dust and moisture resistance,and low-noise EMC suppression circuits reduce industrial site interference. Front panel numbered terminal blocks and LED indicators display channel signal status and fault warning for quick on-site inspection.

This paddle board is widely deployed in petrochemical,chemical,power generation and water treatment plants for legacy TDC300 DCS maintenance and transformation projects. It cooperates with Honeywell LCN adapter board,processor modules and various I/O modules to build a complete Data Hiway distributed I/O architecture. As a core unit for paddle board and signal breakout,it separates the expensive control module from harsh field wiring side. Clearly numbered terminal positions simplify field instrument wiring,loop calibration and periodic signal inspection work for control engineers.