Foxboro FBM224 P0926GG Modules

Technical Dossier

Product Details And Specifications

Foxboro FBM Series: Comprehensive Module Range and Technical Overview

The Foxboro FBM (Fieldbus Module) series is the core I/O and communication backbone of the Foxboro I/A Series Distributed Control System (DCS), one of the most widely deployed process automation platforms in global heavy industry. Installed across petrochemical complexes, nuclear power stations, crude oil refineries, LNG terminals, and pharmaceutical batch facilities, the FBM series provides the physical interface layer between field instrumentation and the I/A Series control network. The FBM224 P0926GG is a galvanically isolated serial communication module designed for high-integrity data exchange in electrically noisy industrial environments. Its isolation architecture makes it a preferred selection in applications where ground loops, high-voltage transients, or intrinsic safety requirements demand strict electrical separation between the DCS backplane and field wiring.

The Evolution of FBM Series Architecture

The Foxboro I/A Series DCS was introduced in the mid-1980s as a distributed, peer-to-peer control architecture, replacing centralized minicomputer-based systems. The FBM series evolved through three distinct generations. The first generation (FBM01–FBM10) established the baseline analog and discrete I/O framework using the Nodebus communication protocol. The second generation (FBM20x–FBM30x) introduced expanded channel density, HART pass-through capability, and enhanced diagnostic registers, aligning with the ISA-5.1 and NAMUR NE43 field device standards. The third generation introduced redundant module configurations and fiber-optic Fieldbus options for geographically distributed installations.

The FBM224 belongs to the mature second-to-third generation transition, offering RS-232/RS-485 isolated serial communication with configurable baud rates and protocol framing. Compatibility with the I/A Series 50 Series, 51 Series, and 70 Series processors has been validated. Modules in this range communicate over the Nodebus or Mesh Control Network (MCN) depending on the host processor generation. Backplane compatibility is constrained to the FBM Baseplate families (P0914YA, P0914YB, P0914YC series), and module substitution across generations requires verification of the host software revision and FoxCal calibration database entries.

FBM Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked modules within the Foxboro FBM series. Each entry reflects a distinct functional classification within the I/A Series I/O subsystem:

FBM201 P0914YA: 8-channel analog input, 4–20 mA, HART-enabled, single-ended.
FBM202 P0914YB: 8-channel analog input, differential, high-accuracy thermocouple/RTD.
FBM204 P0914YC: 8-channel analog output, 4–20 mA, HART pass-through.
FBM207 P0916GC: 32-channel discrete input, 24 VDC, high-density DI module.
FBM211 P0916GD: 16-channel discrete output, relay contact, 120/240 VAC rated.
FBM212 P0916GE: 16-channel discrete input/output, mixed configuration, 24 VDC.
FBM214 P0916GF: 8-channel pulse input, frequency/totalizer, for flow measurement.
FBM217 P0916GG: Redundant analog input module, SIL-2 rated, 8-channel differential.
FBM220 P0922GC: Serial communication module, RS-232, non-isolated, Modbus RTU.
FBM221 P0922GD: Serial communication module, RS-485, non-isolated, multi-drop.
FBM222 P0922GE: Dual-port serial communication, RS-232/RS-485 selectable.
FBM223 P0926GF: Isolated serial communication, RS-232, single-port, 1500 V isolation.
FBM224 P0926GG: Isolated serial communication, RS-232/RS-485, dual-port, 1500 V galvanic isolation, configurable baud rate 300–115200 bps.
FBM225 P0926GH: Isolated serial communication, fiber-optic interface, ST connector.
FBM226 P0926GJ: PROFIBUS DP master communication module, I/A Series gateway.
FBM228 P0926GK: DeviceNet scanner module, I/A Series to DeviceNet network bridge.
FBM230 P0926GL: Foundation Fieldbus H1 communication module, 2-segment.
FBM237 P0926GM: Redundant CPU communication module, peer-to-peer Nodebus interface.
FBM242 P0926GN: High-speed counter/encoder input, 32-bit, quadrature capable.

Sourcing Hard-to-Find & Obsolete FBM Series Parts

The Foxboro I/A Series DCS platform entered its extended lifecycle phase following Schneider Electric's acquisition of Foxboro (formerly Invensys). While Schneider Electric continues to offer limited support under the EcoStruxure Foxboro DCS brand, a significant portion of the FBM module catalog — particularly modules in the FBM20x and early FBM22x ranges — has been formally discontinued or placed on allocation-only supply. Lead times from OEM channels for in-production variants routinely exceed 16–26 weeks.

DriveKNMS maintains a dedicated inventory of new-surplus, refurbished, and tested-functional FBM modules sourced from decommissioned DCS installations, controlled plant shutdowns, and authorized distributor excess stock. For the FBM224 P0926GG specifically, DriveKNMS holds verified stock with full traceability documentation. All modules are stored in ESD-controlled environments at controlled temperature and humidity per IEC 60068-2 storage standards. Customers operating refineries, chemical plants, or power generation facilities with long-term maintenance contracts can establish blanket purchase orders for FBM series modules to ensure supply continuity without capital commitment.

Quality Control for the FBM Series Range

FBM series modules incorporate a multi-layer backplane bus architecture that requires functional validation beyond simple power-on testing. DriveKNMS applies a structured test protocol for all FBM communication modules, including the FBM224 P0926GG, using dedicated I/A Series test rigs configured with authentic Foxboro baseplates and host processors running validated software revisions.

The test sequence for isolated serial communication modules includes: (1) isolation barrier integrity verification at 1500 VDC for 60 seconds per IEC 61010-1; (2) RS-232 and RS-485 loopback communication test at all supported baud rates; (3) Nodebus registration and module address assignment verification; (4) diagnostic register readback confirming no latent fault codes; (5) thermal cycling soak at 55°C for 4 hours to screen for marginal solder joints or capacitor degradation. Modules that pass all five stages are tagged with a DriveKNMS QC serial number and issued a test certificate available upon request.

For procurement inquiries, technical specifications, or lifecycle support for the Foxboro FBM224 P0926GG and the full FBM series catalog, contact DriveKNMS through the following channels: