Foxboro RH927AH (FBM214B) HART Communication Analog Input Module

1. Basic Product Overview

• Full Model: FBM214B, Hardware Code RH927AH (alternative part number P0927AH)
• Series: Foxboro I/A Series Compact 200 DCS I/O Subsystem
• Product Type: 8-channel galvanically isolated HART communication analog input module
• Core Position: Acts as HART master host to collect 4–20mA analog process signals and bidirectional HART digital data from field transmitters, compatible with Foxboro Evo DCS control platformsparesource.schneider-electric.com

2. Core Channel & Signal Specifications

1. Channel Configuration
   • Total 8 fully independent, galvanically isolated input channels
   • Mixed signal access supported per channel: standard 4–20mA analog transmitters / HART 5/6/7 protocol smart transmitters
2. HART Communication Performance
   • Dedicated FSK modem integrated on each channel for half-duplex bidirectional HART communication
   • Baud rate: 1200bps; Up to 2 digital HART messages retrieved per second from field devices
   • Supports HART universal commands, common practice commands and device-specific commands (Burst mode not supported)
   • Maximum field wiring distance: 3,030m (10,000ft) complying with HCF_SPEC-54 physical layer standard
3. Analog Acquisition Performance
   • ADC Type: Sigma-delta high precision converter, 15-bit resolution
   • Overall measurement accuracy: ±0.03% ~ ±0.05% full scale
   • Default channel update cycle: 100ms; configurable integration filtering time 500ms
4. Loop Power Supply
   • Built-in isolated 24VDC ±10% limited loop power supply for each channel
   • Optional external loop power feeding; Cable Balun module required to eliminate crosstalk if multiple channels share one external power sourceparesource.schneider-electric.com

3. Isolation & Protection Design

• Complete channel-to-channel, channel-to-backplane galvanic isolation to eliminate ground loop interference
• Per-channel overcurrent, short-circuit and reverse polarity protection
• Supports handheld HART communicator connection on field wiring side for on-site calibration

4. Mechanical & Environmental Parameters

• Mounting: Plug-in installation on Compact 200 series baseplate; hot-swap capable without rack power shutdown
• Dimension: 22mm × 124mm × 126mm; Net weight: ~0.3kg
• Operating Temperature: -20℃ ~ +70℃
• Storage Temperature: -40℃ ~ +70℃
• Humidity: 5%–95% RH non-condensing
• Contamination Grade: ISA S71.04 Class G3 harsh industrial environment conformal coated PCB
• Altitude: Operating range -300m ~ 3,000m
• Front panel LED indicators: Operational status + independent channel status lights for CH01~CH08 fault diagnosis

5. Matching Supporting Components

1. Termination Assembly (TA): Dedicated terminal base for field 4–20mA/HART cable wiring
2. Cable Balun Module: For multi-channel externally powered loop anti-crosstalk processing
3. Compatible Controllers: Foxboro CP270, CP280, CP30E I/A Series control processors
4. Configuration Tool: Foxboro Field Device Expert (FDE) for HART device parameterization, calibration and diagnostic data viewing

6. Key Advantages

1. Mixed wiring compatibility: Conventional 4–20mA transmitters and HART smart instruments can be freely mixed on the same module without extra hardware
2. Per-channel independent isolation effectively suppresses electromagnetic interference from pumps, motors and inverters
3. High-precision sigma-delta ADC ensures stable process variable acquisition for closed-loop PID control
4. Built-in HART master realizes remote transmitter calibration, fault diagnosis and parameter modification without field disassembly
5. Class G3 anti-corrosion coating adapts to chemical, refinery, coastal high-humidity corrosive control cabinet environments
6. Hot-swap maintenance minimizes unplanned production downtime during module replacement

7. Typical Application Scenarios

• Petrochemical, refinery flow, pressure, level, temperature HART transmitter signal collection
• Thermal power plant boiler and turbine auxiliary process monitoring loops
• Water treatment & sewage plant smart instrument data acquisition
• Pharmaceutical continuous production process closed-loop control systems
• Natural gas processing plant pipeline safety monitoring DCS cabinets
• All process industries requiring simultaneous analog measurement and HART device intelligent diagnostics