Honeywell 51400855-100 PLC SIO Board

Serial I/O Board Overview for TDC 3000 Systems

The 51400855-100 acts as a serial input/output board for Honeywell PLC and TDC 3000 control architectures. This board handles serial communication between controllers and field devices across industrial networks. Engineers choose the 51400855-100 for reliable data exchange and straightforward rack integration. Moreover, the module supports legacy serial protocols that many plants still depend on.

Detailed Technical Specifications

The table below outlines the main parameters of the 51400855-100.

Parameter	Specification
Module type	PLC serial I/O board
Compatible systems	Honeywell PLC and TDC 3000 series
Interface	Dual serial ports plus backplane connector
Slot count	Single-slot occupation
Board dimensions	Approximately 305 mm × 127 mm
Weight	Approximately 0.48 kg
Component count	Over 50 integrated circuits
Energy storage	On-board backup capacitor
Operating temperature	0 °C to 60 °C

Installation and Communication Notes

The 51400855-100 fits one backplane slot and draws power directly from the host rack. Consequently, technicians avoid external power wiring during routine replacement. The board exchanges serial data through its dedicated ports and the standard Honeywell bus interface. Furthermore, the backup capacitor preserves communication settings during brief outages. Plant teams often stock this board as a spare to reduce downtime.

Why This Serial Board Remains Useful

Many process facilities still run PLC and TDC 3000 systems, and the 51400855-100 keeps serial links active. The module delivers stable communication without firmware changes. Additionally, its single-slot design simplifies rack planning and spare-part logistics. Maintenance crews appreciate the clear port labeling and robust connector layout. Therefore, this serial board continues to serve as a dependable interface option.