FOXBORO P0400GH Fieldbus Power Bar Hub Module I A Series DCS (FF H1 PROFIBUS PA Power Supply)

Manufacturer: FOXBORO (Invensys / Schneider Electric Process Automation)

Part Number: P0400GH (Dedicated DIN rail fieldbus power hub module, discontinued original OEM production, only surplus/refurbished spare stock available)

Product Type: Isolated fieldbus power supply & segment hub, FF H1 / PROFIBUS PA dual protocol compatible, provides isolated 24VDC power and bus signal segmentation for smart field transmitters & valve positioners, supports simplex or 1:1 master-tracker hot redundant pair deployment

Matching Platform: Foxboro I/A Series DCS, all FBM communication interface modules (FBM223, FBM224), FF H1 / PA fieldbus instruments, redundant 24VDC rack power supply, DIN rail control cabinet, I/A Toolset configuration software

Core Function: 4 independent galvanically isolated fieldbus power segments; each branch supplies isolated 24VDC for FF H1 / PROFIBUS PA devices; max 2A per segment, total combined output ≤8A; 1500VAC isolation between power input and field bus side to eliminate ground loop interference; built-in multi-stage surge & short-circuit protection per channel; full segment-level fault diagnosis (bus short, open wire, overload, loss of field power); front panel LED status indicators for each bus segment power & communication health; supports N+1 / 1:1 redundant power configuration with bumpless millisecond switchover; integrated bus termination resistor circuit; industrial conformal coated PCB for corrosive offshore Zone2 environments; compact DIN rail mounting, IP20 cabinet grade, hot-swappable segment terminals without full module power down

1. Product Overview

P0400GH is a dedicated DIN rail mounted fieldbus power hub module for Foxboro I/A Series DCS, designed exclusively to power and segment Foundation Fieldbus H1 and PROFIBUS PA intrinsically safe process field instruments. Unlike standard rack-mounted FBM I/O cards, it is a cabinet-side power distribution unit for fieldbus trunk cables, separating four independent bus segments with full electrical isolation to prevent cross-segment noise and fault propagation. It accepts standard industrial 24VDC rack input power and converts it into four isolated, current-limited fieldbus power outputs. Each segment can drive multiple FF H1 / PA transmitters, flow meters, pressure transmitters and HART-compatible valve positioners. Independent short-circuit cut-off and overcurrent fusing per branch ensures a fault on one bus segment does not collapse power or communication for the other three segments, drastically improving overall fieldbus network stability. Integrated multi-layer diagnostic circuitry continuously monitors overload, cable break, bus short-circuit and missing termination resistor faults; each segment has dedicated front panel LED visual alarms for fast on-site troubleshooting without handheld test tools. The module supports 1:1 redundant pairing: two P0400GH units feed the same fieldbus trunk simultaneously, with seamless millisecond-level power transfer if the primary hub fails, eliminating single-point power failure risk for critical reactor, distillation and compressor fieldbus loops. Internal LC EMI filter circuits suppress high-frequency switching noise from variable frequency drives and cabinet power supplies, maintaining clean DC power and stable digital bus communication signals. The PCB is coated with industrial anti-salt/humidity conformal coating, certified for ISA S71.04 Class G3 harsh industrial environments including offshore oil & gas Zone2 hazardous control rooms. FOXBORO has discontinued original manufacturing of P0400GH; it is only supplied as surplus new or fully tested refurbished spare parts for maintenance and renovation of legacy I/A Series DCS systems in power, petrochemical and chemical plants.

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