FOXBORO FBM233 P0926GX 48 VDC/125 VAC Relay Module Compatible with FOXBORO I/A Series Fieldbus

Description

Application Scenarios

At a North American ethylene cracker facility, an aging pneumatic shutdown system relied on solid-state outputs prone to leakage current, causing unintended partial valve actuation during storms. To meet updated SIL requirements, engineers replaced the legacy I/O with FOXBORO FBM233 P0926GX modules across three reactor trains. The electromechanical relays provided true galvanic isolation and zero leakage when open—eliminating spurious trips. During a subsequent high-pressure excursion, the FBM233 reliably energized 16 emergency dump valves within 100 ms, verified by plant historians. The module’s front-panel LEDs instantly showed which channels fired, accelerating post-event analysis. This case highlights how the FBM233 P0926GX bridges digital control logic and physical plant safety with unwavering integrity.

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Technical Principles and Innovative Values

Innovation Point 1: True Electromechanical Relays for Safety-Critical Outputs

Unlike solid-state switches, the FBM233 uses physical contacts that provide zero leakage current when open—essential for preventing unintended actuation in ESD (Emergency Shutdown) and fire & gas systems.

Innovation Point 2: Integrated Diagnostics & DCS Visibility

Each channel reports its real-time status to the I/A Series operator workstation. Failed relays, open circuits, or overloads trigger alarms with precise channel identification—reducing troubleshooting from hours to minutes.

Innovation Point 3: Hot-Swappable Design Minimizes Process Interruption

In continuous-operation plants (e.g., refineries, power stations), the FBM233 can be replaced during runtime without shutting down the entire I/O carrier—maximizing availability.

Innovation Point 4: High Channel Density with Robust Isolation

Packing 16 isolated relay outputs into a single-width FBM module saves panel space while maintaining 500 Vrms isolation—critical in electrically noisy industrial settings.

Application Cases and Industry Value

A European pharmaceutical plant upgraded its cleanroom HVAC controls using FBM233 P0926GX modules to drive HEPA filter bypass dampers and sterilization steam valves. The relays’ clean switching (no arcing residue) and compliance with GMP documentation requirements ensured audit readiness. In another example, a hydroelectric dam in Canada retrofitted its spillway gate controls with FBM233 units to replace obsolete relay panels. The modules’ –20°C cold-start capability and immunity to generator-induced transients proved vital during winter operations.

Related Product Combination Solutions

FOXBORO FBM207 / FBM208: Communications modules that interface the FBM233 with the I/A Series fieldbus (redundant or simplex).

FOXBORO FBM242: 16-channel discrete input module—often paired with FBM233 for full I/O loops (e.g., valve feedback + command).

Schneider Electric Triconex TMR System: Can receive dry contacts from FBM233 for hybrid safety architectures requiring SIL 3.

Rockwell Allen-Bradley 1756-OW16: Comparable ControlLogix output module—useful for cross-platform migration studies.

Phoenix Contact REL-MR-… Series: External relay modules if higher current (>2A) is needed beyond FBM233 ratings.

Emerson DeltaV SIS: Integrates via discrete I/O for combined process and machinery safety in brownfield sites.

Weidmüller ACT20X Signal Conditioners: Used when interfacing FBM233 outputs with non-Foxboro systems requiring level shifting.

HIMA H51q Safety Controller: Accepts FBM233 dry contacts as inputs for certified shutdown sequences.

Installation, Maintenance, and Full-Cycle Support

Installation requires mounting the FBM233 P0926GX into a compatible Foxboro I/A Series FBM carrier (e.g., in a remote I/O cabinet). Wiring uses removable screw-terminal blocks (supplied separately as P0914RK or similar). Key best practices:

Use shielded, twisted-pair cables for long runs.

Fuse each output channel per NEC/IEC standards (typically 2–3 A slow-blow).

Ensure proper grounding of the carrier chassis.

Maintenance is minimal but includes:

Quarterly visual inspection of LED status indicators.

Periodic functional test via I/A Series diagnostic tools (e.g., forcing outputs and verifying field response).

Replacement every 10⁶ operations or if contact resistance exceeds 100 mΩ (rare under normal loads).

Schneider Electric continues to support the FBM233 under its long-life product policy, with manufacturing expected through at least 2030. We supply only new, factory-sealed FBM233 P0926GX modules, complete with original packaging, certificates of conformity, and pre-shipment verification testing. Contact us for engineering support—including compatibility checks with your I/A Series version (v6.x, v8.x, etc.), redundancy planning, and obsolescence risk mitigation—to ensure seamless integration and decades of reliable service.

FBM233