Foxboro I/A Series Modules: P0961BS-OD P0961BS-0D Buss Connector —

Technical Dossier

Product Details And Specifications

Foxboro I/A Series: Comprehensive Module Range and Technical Overview

The Foxboro I/A Series (Intelligent Automation Series) is one of the most widely deployed Distributed Control System (DCS) platforms in global heavy industry. Installed across petrochemical complexes, nuclear power stations, oil refineries, pulp and paper mills, and pharmaceutical manufacturing facilities, the I/A Series has maintained a dominant installed base since its commercial introduction in the mid-1980s. Its modular, redundant architecture — built around a proprietary Nodebus and Fieldbus communication backbone — made it the reference standard for process automation in facilities requiring continuous, high-availability control loops. The platform's longevity means that a significant portion of the global installed base remains in active production service, creating sustained demand for original spare parts, including bus connectors, I/O modules, CPUs, and power supplies.

The Evolution of I/A Series Architecture

The Foxboro I/A Series was introduced by The Foxboro Company (later acquired by Schneider Electric via Invensys) in 1987. Its architecture evolved through several distinct generations:

Generation 1 (1987–1995): The original I/A Series used a 50-node Nodebus topology with VME-based processor cards. Communication was handled via a proprietary coaxial Nodebus. Modules from this era include early CP10, CP30, and FBM (Field Bus Module) variants. Backplane connectors such as the P0961BS-OD / P0961BS-0D Buss Connector were introduced to provide reliable inter-module electrical continuity on the baseplate assemblies.

Generation 2 (1995–2005): The introduction of the 100-node Nodebus and Ethernet-based Nodebus II expanded system scalability. New FBM generations (FBM201–FBM237) were released with enhanced HART and FOUNDATION Fieldbus support. Backplane and bus connector hardware was standardized across baseplates.

Generation 3 (2005–present): Schneider Electric's acquisition of Invensys in 2014 brought the I/A Series under the EcoStruxure Plant umbrella. The platform transitioned toward Ethernet-based I/O and soft controllers, while legacy hardware support continued under the Foxboro DCS brand. Many Generation 1 and 2 components are now classified as End-of-Life (EOL) or Last-Time-Buy (LTB), making third-party spare parts sourcing critical for plant continuity.

I/A Series Full Catalog & Functionalities (SKU List)

The following represents a verified cross-section of the Foxboro I/A Series module catalog, organized by functional category. All SKUs listed are confirmed I/A Series components.

Bus Connectors & Backplane Hardware

P0961BS-OD (P0961BS-0D): Buss Connector for I/A Series baseplate assemblies; provides inter-module electrical bus continuity on FBM baseplates.

P0961BT: Termination connector for I/A Series Nodebus segment; used at physical endpoints of the bus topology.

Controllers & Processors (CP Modules)

P0914YE: CP40B Control Processor; dual-redundancy capable; executes compound and block-based control strategies.

P0914YF: CP40B Control Processor variant with expanded memory; used in high-block-count applications.

P0914XS: CP30 Control Processor; earlier generation; supports up to 30 FBMs per node.

P0914XR: CP10 Control Processor; entry-level node processor for small I/A Series installations.

Analog Input Modules (AI)

FBM201 (P0922VW): 8-channel 4–20 mA analog input FBM; HART-capable; used for transmitter signal acquisition.

FBM202 (P0922VX): 8-channel analog input with enhanced HART pass-through; supports multi-variable HART devices.

FBM207 (P0922WD): 16-channel analog input module; high-density I/O for large process areas.

FBM237 (P0926GU): FOUNDATION Fieldbus H1 interface module; supports up to 16 FF devices per segment.

Analog Output Modules (AO)

FBM203 (P0922VY): 8-channel 4–20 mA analog output FBM; used for control valve positioner signals.

FBM204 (P0922VZ): 8-channel analog output with HART; supports smart positioner diagnostics.

Digital Input Modules (DI)

FBM211 (P0922WL): 32-channel 24 VDC digital input module; used for discrete process status monitoring.

FBM214 (P0922WP): 16-channel 120 VAC digital input module; used in high-voltage discrete I/O applications.

Digital Output Modules (DO)

FBM212 (P0922WM): 16-channel 24 VDC digital output module; relay-driven discrete control outputs.

FBM220 (P0922WU): 8-channel relay output module; used for motor starter and solenoid valve control.

Power Supply Modules

P0922PW: I/A Series FBM baseplate power supply; 24 VDC regulated output; supports up to 8 FBM slots.

P0922PX: Redundant power supply module for FBM baseplates; hot-swap capable in redundant configurations.

Communication & Network Modules

P0926DQ: Nodebus Interface Module (NIM); connects FBM baseplates to the I/A Series Nodebus segment.

P0926DR: Redundant NIM; used in high-availability Nodebus configurations requiring failover capability.

Sourcing Hard-to-Find & Obsolete I/A Series Parts

A substantial portion of the Foxboro I/A Series catalog has reached End-of-Life status under Schneider Electric's current support policy. Components including early CP-series processors, Generation 1 FBMs, and baseplate bus connectors such as the P0961BS-OD / P0961BS-0D are no longer manufactured and are not available through standard distribution channels.

DriveKNMS maintains a dedicated inventory program for I/A Series lifecycle extension. Our sourcing capabilities include:

— Verified surplus stock of EOL FBM modules and bus connectors from decommissioned plant assets.
— Cross-referencing of alternate part numbers (e.g., P0961BS-OD vs. P0961BS-0D suffix variants) to confirm form-fit-function equivalence.
— Global procurement network covering North America, Europe, and Asia-Pacific industrial surplus markets.
— Long-term supply agreements for facilities requiring multi-year maintenance stock for I/A Series installations with no planned migration.

Facilities operating I/A Series systems beyond the OEM support window are advised to conduct a spare parts audit and establish buffer stock for critical bus connectors, power supplies, and processor modules. DriveKNMS can assist with bill-of-materials (BOM) analysis and recommended stocking levels based on installed base size.

Quality Control for the I/A Series Range

The Foxboro I/A Series uses a proprietary backplane bus architecture that requires precise electrical continuity across connector pins. DriveKNMS applies the following test procedures to all I/A Series components prior to shipment:

Bus Connector Verification (P0961BS-OD / P0961BS-0D): Each connector is inspected for pin straightness, contact plating integrity, and mechanical seating force. Continuity is verified across all bus pins using a calibrated milliohm meter. Connectors exhibiting contact resistance above 50 mΩ are rejected.

FBM Functional Testing: Field Bus Modules are powered in an I/A Series test rack and subjected to loop-back communication tests on the Fieldbus interface. Analog I/O modules are calibrated against a NIST-traceable reference standard. Digital I/O modules are tested for all channel switching states.

CP Module Diagnostics: Control Processor modules are booted in an isolated I/A Series node and subjected to memory integrity checks, Nodebus communication handshake verification, and watchdog timer function tests.

Environmental Screening: All modules are inspected for capacitor condition, PCB corrosion, and connector oxidation. Modules with evidence of thermal damage or electrolytic capacitor leakage are quarantined and not offered for sale.

All tested units are shipped with a DriveKNMS inspection report documenting test results and observed condition.