Product Description

The FBM231 (P0931RM) is a high-performance serial communication interface for Foxboro I/A Series and Foxboro Evo distributed control systems (DCS). It serves as a versatile bridge between the DCS fieldbus and a wide range of Intelligent Field Devices (IFDs) via RS-422 or RS-485 physical layers.

With four independent ports, the FBM231 enables integration of critical data from third-party equipment such as power monitors, motor starters, and analytical controllers.

Designed for high-density industrial environments, the module provides galvanic isolation between ports and the system bus to prevent ground loops and maintain signal integrity. It supports flexible protocol integration through Distributed Control Interface (DCI) blocks, making serial devices appear as native I/O points in the DCS. Its rugged construction ensures reliable operation even in electrically noisy, harsh industrial settings.

Technical Specifications

Application Scenarios

The FBM231 (P0931RM) is commonly used for:

• Interfacing with PLCs via proprietary serial protocols.

• Managing multivariable data from smart weigh scales and dosing systems.

• Monitoring electrical switchgear through serial protection relays.

• Integrating gas chromatographs and other analytical instruments into the main control loop.

Frequently Asked Questions

Q: Does the FBM231 support RS-232 communication?
A: No. The FBM231 is designed specifically for RS-422/RS-485 differential signals. For RS-232 devices, use an FBM230 or a compatible external signal converter.

Q: Is this module hot-swappable?
A: Yes. The FBM231 can be removed or replaced while the system is powered. Note that a brief interruption of serial communication to connected devices will occur during the swap.