Honeywell 51401952-200 Keyboard Interface PCB

Overview

The Honeywell 51401952-200 is a dedicated keyboard interface printed circuit board engineered for Honeywell legacy operator workstations and classic console furniture. This module acts as the electronic bridge between membrane keyboards and the control system, ensuring stable operator input recognition in long-service industrial environments.

Designed specifically for Honeywell’s classic workstation architecture, the board supports multiple keyboard layouts and integrates power and communication over a single connection, simplifying cabinet wiring and long-term maintenance.

Functional Role

The 51401952-200 operates as the core keyboard interface electronics within Honeywell classic furniture assemblies. It processes keystroke signals from membrane keyboards and transmits validated input data to compatible I/O boards using serial communication.

Key functional responsibilities include keyboard signal decoding, layout recognition, and robust communication handling for operator interaction.

Keyboard Compatibility

The interface PCB supports multiple legacy Honeywell membrane formats, allowing flexibility across different workstation generations.

Supported keyboard layouts include:

• ABCDE membrane keyboards

• QWERTY membrane keyboards

This dual-layout capability makes the 51401952-200 suitable for retrofit, refurbishment, and spare part replacement scenarios.

Electrical and Communication Characteristics

The 51401952-200 is powered directly from the host system and communicates through an industrial serial interface.

Electrical and communication parameters include:

• Supply voltage: 24 VDC nominal

• Typical current draw: approximately 100 mA

• Communication interface: RS-485 serial link

• Protocol support: compatible with Modbus RTU–based communication architectures

• Multi-drop capability: supports networked device configurations when used within compliant system designs

System Compatibility

This keyboard interface PCB is designed to work with Honeywell classic I/O and furniture electronics.

Verified compatibility includes:

• CE-compliant EPDGC I/O boards

• Non-CE EPDGP series boards

• Typical mating boards: 51304854-200 and 51304854-300

Power and data are transmitted through a single cable interface, reducing installation complexity and improving long-term reliability.

Mechanical Construction

The 51401952-200 is a compact, rigid PCB intended for enclosed console installation.

Physical characteristics:

• Form factor: square PCB

• Dimensions: 5 × 5 × 0.5 inches

• Weight: 0.22 lb

• Mounting: internal panel or console mounting within Honeywell furniture

Environmental Operating Limits

The module is rated for continuous operation in industrial control room conditions.

Environmental specifications:

• Operating temperature range: –20 °C to +60 °C

• Storage temperature range: –40 °C to +85 °C

• Relative humidity: up to 95 percent, non-condensing

Typical Applications

Common application scenarios include:

• Honeywell classic operator consoles

• Legacy HMI workstations

• Control room furniture refurbishment projects

• Spare part replacement for aging Honeywell systems

• Long-life automation platforms where keyboard input reliability is critical

Frequently Asked Questions

Q: Is the 51401952-200 a complete keyboard?
A: No. The 51401952-200 is the keyboard interface PCB only. It requires a compatible Honeywell membrane keyboard.

Q: Can this board be used with modern Honeywell Experion systems?
A: This module is intended for legacy and classic Honeywell platforms. Compatibility with modern Experion hardware is not supported.

Q: Does the board support hot-swap installation?
A: No. Power should be removed before installation or replacement to prevent electrical damage.