Description

The FOXBORO RH926GH is an 8-channel analog input (AI) module designed for the Foxboro I/A Series® distributed control system (DCS) by Schneider Electric. Specifically engineered for high-reliability applications, this module accepts 4–20 mA signals from field transmitters while supporting HART digital communication over the same wiring—enabling real-time access to device diagnostics, calibration data, and configuration parameters.

As part of the FBM207/208 redundant I/O family, the RH926GH supports 1:1 hot-swap redundancy, galvanic isolation, and seamless integration with asset management tools like Emerson AMS Suite, Siemens PDM, or Schneider’s own SmartPlant Instrumentation. It is widely deployed in power plants, refineries, chemical facilities, and pharmaceutical manufacturing where signal accuracy, uptime, and predictive maintenance are non-negotiable.

Application Scenarios

At a biopharmaceutical plant in Switzerland, inconsistent batch yields were linked to undetected drift in pH transmitter calibration. Engineers replaced legacy analog cards with FOXBORO RH926GH modules, enabling weekly automated HART polls via AMS Suite. The system now flags transmitters with >0.5% span deviation before they impact product quality. During a recent audit, regulators praised the plant’s “digital traceability” of all sensor calibrations—directly attributable to the RH926GH’s embedded HART gateway. Downtime for manual checks dropped by 90%, and batch repeatability improved to ±0.2%.

Technical Principles and Innovative Values

Innovation Point 1: Embedded HART Multiplexer – Unlike basic AI cards, the RH926GH includes a built-in HART modem per channel, allowing simultaneous analog measurement and digital communication—no external HART multiplexer needed.

Innovation Point 2: True Redundant Architecture – In FBM208 mode, two RH926GH modules operate in active/standby with automatic failover (<50 ms), ensuring continuous process visibility during hardware faults or maintenance. Innovation Point 3: Predictive Maintenance Enablement – By exposing HART variables (e.g., sensor temperature, damping settings, fault flags) to the DCS and asset managers, the module shifts maintenance from calendar-based to condition-based. Innovation Point 4: Backward & Forward Compatibility – The RH926GH works across I/A Series versions from v5.x to v9.x and coexists with FOUNDATION Fieldbus (via FCM10EF) in hybrid architectures—ideal for phased modernization. Application Cases and Industry Value A Middle Eastern desalination plant retrofitted its high-pressure RO skids with FOXBORO RH926GH modules to monitor differential pressure across membrane arrays. The HART interface revealed early fouling trends by tracking pressure sensor zero shifts—triggering CIP (clean-in-place) cycles 3 days earlier than scheduled. Membrane life extended by 18 months, saving $350K annually in replacement costs. Similarly, a U.S. nuclear facility upgraded its feedwater control system using redundant RH926GH pairs to meet NRC regulatory requirements for I/O reliability. The module’s diagnostic coverage (>95%) and SIL2-capable architecture simplified compliance documentation, while hot-swap capability eliminated the need for outage windows during replacements.

Related Product Combination Solutions

FOXBORO FBM208: Redundant I/O carrier for RH926GH (supports dual-module hot standby)

FOXBORO RH916NH: Non-HART version of the 8-channel AI module

EMERSON 3051S: HART pressure transmitter commonly paired with RH926GH

YOKOGAWA EJA110E: Smart differential pressure transmitter with HART output

SCHNEIDER IAS DCS: Full platform hosting RH926GH in engineering & runtime environments

FOXBORO RH927GH: 8-channel analog output (AO) module for complementary control loops

AMS Device Manager: Software for HART device configuration and health monitoring

FOXBORO TB207: Terminal block assembly for FBM207/208 carriers

Installation, Maintenance, and Full-Cycle Support

Installing the FOXBORO RH926GH involves snapping it into an FBM207 (single) or FBM208 (redundant) carrier mounted on a DIN rail. Field wiring connects via removable screw terminals with shield grounding provisions. Configuration is performed in I/A Series Engineering Studio, where each channel is assigned engineering units, range, HART tag, and alarm limits.

Maintenance leverages the module’s self-diagnostics: front-panel LEDs indicate power, redundancy status, and channel faults. HART alerts (e.g., “sensor failure,” “output saturated”) appear directly in the DCS alarm banner. Thanks to hot-swap design, failed units can be replaced without powering down the rack—critical for 24/7 operations.

We supply only genuine FOXBORO RH926GH modules—either new surplus or professionally refurbished to OEM specifications, complete with functional test reports, HART communication verification, and compatibility validation for your I/A Series version. Our team includes certified Foxboro engineers who offer lifetime technical support for configuration, redundancy setup, and integration with asset management platforms. Contact us for a solution that transforms your analog signals into actionable intelligence—today and for decades to come.