Foxboro FBM203 Foundation Fieldbus Analog Input Module

Product Type: 8-Channel Foundation Fieldbus H1 Analog Input Module

Overview:
The Foxboro FBM203 is an 8-channel analog input module for the Foxboro FBM Series Foundation Fieldbus system. It accepts 4–20 mA DC signals from field transmitters (pressure, temperature, level, flow) and communicates the digitized values to the DCS controller via the Foundation Fieldbus H1 segment. The module also supports HART communication for smart transmitter configuration.

Category:
Description

Functional Features:

  • Provides 8 analog input channels with 4–20 mA input capability
  • Supports HART 5/7 communication on each channel for smart transmitter access
  • Includes per-channel signal filtering (configurable: 0.5 s to 10 s)
  • Supports per-channel range scaling (e.g., 0–100 psi, 0–500°C)
  • Provides diagnostic data including wire fault detection, sensor fault, and out-of-range alarms
  • Features galvanic isolation between each input channel and the Fieldbus
  • Supports FOUNDATION Fieldbus function blocks for in-segment signal processing

Technical Specifications:

  • Number of Channels: 8 analog inputs
  • Input Signal: 4–20 mA DC (2-wire loop powered)
  • Input Resistance: 250 Ω maximum (voltage drop at 20 mA = 5 VDC)
  • Resolution: 16-bit A/D converter (65,536 counts)
  • Accuracy: ±0.1% of calibrated span (typical)
  • HART Protocol: HART 5 and HART 7 compliant on all channels
  • Scan Rate: 1 second per channel (typical), configurable down to 100 ms
  • Isolation: 500 VDC between channels, 500 VDC to Fieldbus
  • Common Mode Rejection: ≥ 100 dB at 50/60 Hz
  • Power Supply: 24 VDC from FBM chassis backplane (via FBM201 or equivalent)
  • Operating Temperature: 0°C to +60°C (+32°F to +140°F)
  • Module Format: Standard FBM series half-width card
  • Dimensions: Standard FBM card (approx. 165 mm × 100 mm × 25 mm)

Material Composition:

  • PCB: FR-4 fiberglass epoxy with conformal coating
  • Connectors: Shielded Fieldbus connector (Type A) + screw-terminal blocks for field wiring
  • Housing: Metal shield with EMI gasket
  • Terminal Blocks: Phoenix Contact or equivalent, rated for 1.5 mm² to 2.5 mm² wire

Applicable Industries:
Oil and Gas, Chemical Processing, Power Generation, Refining, Pharmaceutical, Food and Beverage, Pulp and Paper

Installation Requirements:

  • Installed in FBM series chassis with FBM201 power supply (or equivalent)
  • Field wiring (4–20 mA loops) connected to screw-terminal blocks on the module
  • Fieldbus trunk cable connected via shielded twisted pair (Type A)
  • Configuration via I/A Series Control Builder or Evo DCS engineering software
  • HART communication requires a HART modem or multi-drop HART master

Advantages:

  • 8 channels per module reduces chassis space and cost
  • HART on every channel enables full smart transmitter diagnostics without additional hardware
  • High-resolution 16-bit conversion provides excellent measurement accuracy
  • Per-channel isolation prevents ground loops and crosstalk between inputs
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