Component Snapshot At-a-Glance
- Model: P0916BX (FBM214/FBM216 equivalent)
- Alt. P/N: FBM214, FBM216, -0C
- Product Series: Foxboro I/A Series DCS
- Hardware Type: 8-channel analog input module (HART-capable)
- Key Feature: 1500Vrms group isolation + HART pass-through on all 8 channels
- Primary Field Use: Interface 4-20mA/HART transmitters to I/A Series controllers in noisy process plants
Hard-Numbers: Technical Specifications
- Protocol Support: I/A Fieldbus (2Mbps, redundant), HART (pass-through)
- Channel Count: 8 analog input (4-20mA DC, HART FSK superimposed)
- Update Rate: 25ms per channel
- Operating Temperature: -25°C to +60°C (G3 environment rated)
- Isolation Rating: 1500Vrms (field-to-backplane, group isolation)
- Power Draw: 24VDC, 8.5W max (backplane-powered)
- Accuracy: ±0.03% of span
- Input Impedance: 61.5Ω nominal
- Dimensions: 88.9×68.6×22.2mm; Weight: 0.15kg
- Form Factor: 200-series baseplate compatible (P0914XB0C)
The Real-World Problem It Solves
Most 8-channel analog cards either lack HART or skimp on isolation, leading to lost diagnostics and ground loops in high-noise plants. The fixes both without sacrificing rack space.
Where you’ll typically find it:
- Refineries: 8-pack of pressure/temperature transmitters on crude oil feed loops
- Power Plants: Boiler drum level, steam pressure, and feedwater flow HART transmitters
- Chemical Plants: pH, conductivity, and density sensors in corrosive areas
Bottom line: It’s the go-to I/A module for high-density, isolated HART analog input where signal integrity and diagnostics matter.
Hardware Architecture & Under-the-Hood Logic
The is a smart isolated input module with its own 32-bit CPU; it handles all signal conditioning and HART framing locally, no controller dependency.
- Field Wiring → TA Termination: 4-20mA/HART loops land on termination assembly; external 24VDC required (no loop power from module).
- Group Isolation Barrier: All 8 channels pass through a single 1500Vrms galvanic isolator to break ground loops.
- Sigma-Delta Conversion: Inputs digitized at 25ms intervals; HART FSK data extracted and buffered.
- Local Processing: On-board CPU runs diagnostics, HART message framing, and fault detection.
- Backplane Communication: Data transmitted over redundant 2Mbps Fieldbus to I/A controller (P0170PD).
Field Service Pitfalls: What Rookies Get Wrong
Confusing with FBM204
Rookies mix up (8-in only) with FBM204 (4-in/4-out), leading to wrong wiring and no outputs.
- Field Rule: is input-only; use FBM204 if you need analog outputs.
Overlooking External Loop Power
Rookies expect the to power 2-wire transmitters, but it doesn’t—#1 no-signal fault.
- Quick Fix: Run separate 24VDC to each loop; measure 24V at TA terminals before troubleshooting the module.
Ignoring HART Enable in Slot Config
Dropping into a slot set for non-HART FBMs breaks HART communication, even if analog values read fine.
- Field Rule: In I/A Series, set slot type to ; enable HART per channel and re-download config.
Commercial Availability & Pricing Note
Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.
