Foxboro I/A Series Modules P0916SG-0B Contact Sense Module

Technical Dossier

Product Details And Specifications

Foxboro I/A Series Technical Notes

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 fieldbus-based backplane and a deterministic real-time operating environment — made it the reference standard for continuous process control in safety-critical applications. Facilities operating Foxboro I/A Series systems represent decades of capital investment in engineering, commissioning, and operator training, making long-term spare parts availability a strategic operational requirement rather than a routine procurement task.

The Evolution of I/A Series Architecture

The I/A Series was introduced by Foxboro (now a brand under Schneider Electric's Foxboro/Triconex portfolio) in 1987 as a successor to the SPEC 200 and FOX 1/A platforms. The architecture is organized around the Nodebus and Fieldbus communication layers, with Control Processors (CPs) acting as the primary execution engines and I/O modules residing in FBM (Fieldbus Module) enclosures distributed across the plant floor.

Early generations (late 1980s–1990s) used parallel backplane designs with discrete analog and digital I/O modules. The mid-generation transition (late 1990s–2000s) introduced enhanced CP models (CP30, CP40, CP60) with expanded memory and faster scan rates. The modern generation (2000s–present) added Ethernet-based communication options and integration with AIM (Application Interface Module) platforms for historian and MES connectivity. Compatibility between generations is maintained at the Nodebus protocol level, but physical module form factors and firmware revisions must be matched precisely when sourcing replacement parts. Mixing incompatible firmware revisions on redundant module pairs is a documented failure mode that must be avoided during maintenance sourcing.

I/A Series Full Catalog & Functionalities — SKU List

Contact Sense / Digital Input Modules

• P0916SG-0B: 16-channel contact sense input module, 24 VDC, dry contact, FBM standard enclosure
• P0916SA: 16-channel contact sense input, 120 VAC wet contact, isolated channels
• P0916SB: 16-channel contact sense input, 48 VDC, field-powered configuration
• P0916SC: 16-channel contact sense input, 24 VDC, with diagnostics output

Analog Input Modules

• P0914TW: 8-channel analog input, 4–20 mA, HART-enabled, FBM enclosure
• P0914TX: 8-channel analog input, thermocouple/RTD universal input
• P0914YA: 16-channel analog input, 1–5 VDC, high-density configuration
• P0914YB: 8-channel analog input, millivolt/thermocouple, cold junction compensated

Analog Output Modules

• P0917TW: 8-channel analog output, 4–20 mA, HART pass-through
• P0917TX: 4-channel analog output, 4–20 mA, high-drive, valve positioner rated

Digital Output Modules

• P0918SA: 16-channel discrete output, 24 VDC sourcing, 0.5 A per channel
• P0918SB: 8-channel discrete output, 120 VAC, relay-isolated, 2 A per channel
• P0918SC: 16-channel discrete output, 48 VDC, sinking configuration

Control Processors (CPU Modules)

• P0914XS: CP30 Control Processor, 32 MB RAM, dual Nodebus ports, redundancy-capable
• P0914XT: CP40 Control Processor, 64 MB RAM, enhanced floating-point, Ethernet option
• P0914XU: CP60 Control Processor, 128 MB RAM, high-speed execution, AIM-compatible

Communication & Power Modules

• P0922VW: Nodebus Interface Module, dual-redundant coax, termination integrated
• P0922VX: Fieldbus Isolator Module, galvanic isolation, surge protection rated
• P0922YA: Power Supply Module, 24 VDC output, 10 A, redundant pair capable

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

DriveKNMS maintains a dedicated inventory of I/A Series modules sourced through certified secondary market channels. All units are inspected, tested, and documented prior to shipment. For facilities operating under extended maintenance contracts or regulatory compliance frameworks (e.g., nuclear QA programs), DriveKNMS can provide traceability documentation and test records on request. Customers with large BOM requirements are encouraged to submit full parts lists for consolidated quotation to minimize per-unit sourcing costs and consolidate shipping logistics.