Foxboro FBM Series Modules

Technical Dossier

Product Details And Specifications

Foxboro FBM Series: Comprehensive Module Range and Technical Overview

The Foxboro FBM (Field Bus Module) series, developed under Invensys and now maintained by Schneider Electric, represents one of the most widely deployed distributed control system (DCS) module families in global heavy industry. Installed across petrochemical refineries, nuclear power stations, offshore platforms, pulp and paper mills, and large-scale chemical processing facilities, the FBM series forms the I/O backbone of the Foxboro I/A Series DCS — a platform with an installed base spanning decades of continuous industrial operation. The FBMSSW and its sibling modules are engineered for deterministic signal processing, high-noise-immunity field wiring, and long-term operational stability in environments where unplanned downtime carries significant financial and safety consequences. The FBM series remains one of the most requested legacy DCS module families for spare parts procurement globally.

The Evolution of FBM Series Architecture

The FBM series was introduced as part of the Foxboro I/A Series DCS platform in the mid-1980s, representing a shift from centralized control architectures to distributed, fieldbus-oriented I/O processing. Early FBM generations (FBM01–FBM10) handled basic analog and discrete I/O with dedicated signal conditioning per channel. The architecture relied on the Nodebus and Fieldbus communication layers, enabling modular expansion without rewiring field instrumentation.

Through the 1990s and 2000s, Foxboro expanded the FBM catalog to include specialized modules for HART communication, pulse counting, RTD/thermocouple inputs, and high-speed discrete outputs. The introduction of the FBM230 and FBM237 series marked a transition toward HART-enabled field device management, allowing asset management software integration without additional hardware. The FBMSSW module specifically addresses software-configurable switching functions within the I/A Series control network.

Following Invensys's acquisition by Schneider Electric in 2014, the FBM platform entered a managed lifecycle phase. Schneider Electric continues to support the I/A Series under the EcoStruxure Foxboro DCS brand, but many FBM modules are now classified as mature or end-of-active-production, making third-party spare parts sourcing critical for facilities committed to long-term I/A Series operation. Compatibility between FBM generations is governed by the Fieldbus Module Carrier (FMC) and the Control Processor (CP) firmware version — cross-generation substitution requires careful validation.

FBM Series Full Catalog & Functionalities (SKU List)

The following represents a verified cross-section of the Foxboro FBM module catalog, organized by functional category. Each model listed is a documented component of the Foxboro I/A Series DCS platform.

Analog Input Modules

• FBM201: 8-channel 4–20 mA analog input, HART-compatible, single-ended
• FBM202: 8-channel analog input module with differential signal conditioning
• FBM204: 16-channel analog input, non-HART, high-density field termination
• FBM207: 8-channel RTD/resistance input module, 2/3/4-wire configurations
• FBM208: 8-channel thermocouple/mV input module, cold junction compensated

Analog Output Modules

• FBM205: 8-channel 4–20 mA analog output, HART-compatible
• FBM206: 8-channel analog output, non-HART, standard current loop drive

Discrete Input Modules

• FBM210: 32-channel 24 VDC discrete input, high-density, sink/source configurable
• FBM211: 16-channel 120 VAC discrete input module
• FBM212: 16-channel 240 VAC discrete input module
• FBM214: 32-channel 24 VDC discrete input, isolated, for safety-critical applications

Discrete Output Modules

• FBM215: 16-channel 24 VDC discrete output, sourcing type
• FBM216: 8-channel relay output module, Form C contacts, 5A rated
• FBM217: 16-channel 120 VAC discrete output module

Communication & Specialty Modules

• FBM220: Pulse input module, 4-channel, for flow totalizer and encoder applications
• FBM230: HART multiplexer interface module, 8-channel field device management
• FBM237: Advanced HART I/O module with integrated device diagnostics
• FBMSSW: Software-configurable switching module for I/A Series control network signal routing and redundancy management

Power & Carrier Infrastructure

• FBM01: Original-generation analog input module, 4-channel, legacy I/A Series
• FBM02: Original-generation analog output module, 4-channel, legacy I/A Series

Sourcing Hard-to-Find & Obsolete FBM Series Parts

DriveKNMS maintains a dedicated inventory program for Foxboro FBM series modules, with particular focus on models that have transitioned to end-of-active-production status under Schneider Electric's lifecycle management policy. For facilities operating I/A Series DCS platforms installed in the 1990s and early 2000s, OEM procurement channels are frequently unable to fulfill orders for specific FBM variants within operationally acceptable lead times.

Quality Control for the FBM Series Range

FBM series modules present specific quality control challenges due to their backplane bus architecture and the precision requirements of their analog signal conditioning circuits. DriveKNMS applies a structured inspection protocol to all FBM units prior to dispatch:

• Visual inspection: PCB examination for corrosion, capacitor degradation, relay contact wear, and connector pin integrity
• Backplane bus communication test: Verification of Nodebus/Fieldbus protocol handshake using I/A Series-compatible test equipment
• Channel-level functional test: Each I/O channel is exercised across its full signal range; analog modules are tested for linearity and offset error within OEM specification
• HART communication validation: For HART-enabled modules (FBM201, FBM205, FBM230, FBM237), HART command set compliance is verified using a calibrated HART communicator
• Firmware version logging: Module firmware revision is recorded and disclosed to the customer prior to shipment to ensure compatibility with the target CP and I/A Series software release

Units that fail any stage of the above protocol are quarantined and not offered for sale.