Description
Product Description
The Honeywell 51401952-200 keyboard interface board is an industrial Printed Circuit Board designed for operator console integration in Honeywell legacy control platforms. This module provides the electronic interface required to connect membrane keyboards to classic Honeywell operator furniture used in distributed control systems.
Built for dependable operation in demanding industrial environments, the 51401952-200 board supports both ABCDE and QWERTY membrane keyboard layouts. It simplifies installation by transmitting both power and communication signals through a single cable connection. The board communicates using an RS-485 interface and supports Modbus RTU protocol, enabling reliable interaction with compatible I/O systems.
This version represents the updated keyboard interface electronics used in Honeywell’s classic console infrastructure and is commonly installed during maintenance, refurbishment, or modernization of older control cabinets.
Key Features
• Compatible with ABCDE and QWERTY membrane keyboard layouts
• Integrated power and data transmission through one cable
• RS-485 serial communication with Modbus RTU support
• Designed for Honeywell legacy operator console furniture
• Supports CE-compliant and selected non-CE Honeywell I/O boards
• Compact PCB design suitable for console electronics integration
Technical Specifications
| Parameter |
Specification |
| Manufacturer |
Honeywell |
| Model |
51401952-200 |
| Product Type |
Keyboard Interface Printed Circuit Board |
| Power Supply |
24 VDC |
| Current Consumption |
Approx. 100 mA |
| Communication Interface |
RS-485 |
| Protocol Support |
Modbus RTU |
| Supported Keyboard Types |
ABCDE membrane keyboard, QWERTY membrane keyboard |
| Maximum Connected Devices |
Up to 128 |
| Weight |
0.22 lb |
| Operating Temperature |
-20 °C to 60 °C |
| Storage Temperature |
-40 °C to 85 °C |
| Humidity |
0–95% non-condensing |
System Compatibility
The 51401952-200 keyboard interface PCB is designed for integration with Honeywell operator console systems and supports several compatible I/O platforms, including:
• CE-compliant EPDGC I/O boards
• Non-CE EPDGP boards such as 51304854-200 and 51304854-300
This compatibility makes the board suitable for maintaining legacy Honeywell control environments while allowing gradual system upgrades.
Typical Application Areas
The keyboard interface module is typically installed in operator stations and control furniture used in industrial process control environments.
Common installations include:
• Distributed Control System (DCS) operator consoles
• Process plant control rooms
• Refinery and petrochemical automation systems
• Power generation monitoring stations
• Industrial control cabinet retrofits
FAQ
What is the primary function of the Honeywell 51401952-200 board?
It provides the electronic interface that connects membrane keyboards to Honeywell operator console systems, enabling operator input for control and monitoring functions.
Which keyboard layouts are supported?
The module supports both ABCDE and QWERTY style membrane keyboards used in Honeywell console furniture.
What communication protocol does the board use?
The board communicates through an RS-485 serial interface and supports the Modbus RTU protocol.
Is the module suitable for system upgrades?
Yes. The board is often installed when maintaining or upgrading legacy Honeywell operator consoles to ensure compatibility with newer CE-compliant I/O hardware.
