Component Snapshot At-a-Glance
- Model:
- Alt. P/N: No direct OEM cross; sibling variants P0916AC(FBM202), P0916AE(FBM203) for RTD/TC signal terminals
- Product Series: Foxboro I/A Series 200-Series FBM Field Terminal Assembly(FTA) family, mates exclusively with core board
- Hardware Type: Compression-style field wiring terminal base, plugs into rear of analog input card
- Key Feature: Per-channel galvanic isolation + built-in HART signal pass-through without external inline resistors
- Primary Field Use: Terminate passive/active 4–20mA process transmitters for refinery, power plant, offshore pipeline DCS I/O racks
Hard-Numbers: Technical Specifications
- Protocol Support: Pass-through I/A proprietary Fieldbus; transparent HART digital overlay on analog loops
- Port Count: 8 field compression terminal channels + 1 rear DB36 mating connector to main PCB
- Baud/Data Rate: Fieldbus backplane fixed 2Mbps; HART default 1200bps superimposed on 4–20mA current loop
- Operating Temperature: -20℃ ~ +60℃ continuous rated; ISA G3 harsh chemical atmosphere certified
- Isolation Rating: 2500VAC channel-to-channel + channel-to-chassis ground isolation
- Power Draw: Max 1.1W, loop power sourced externally from field transmitters, no backplane power consumption for field side
- Supported Signal Range: Standard 4–20mA passive 2-wire / active 3-wire analog input
- ADC Resolution Match: Matches mainboard 16-bit sigma-delta conversion precision
- Physical Weight: 0.18kg per single unit
The Real-World Problem It Solves
Screw-type terminal legacy FTAs develop loose wire creep from cabinet thermal cycling; intermittent open loops create wandering DCS PV values that trigger false process alarms across tank farm and boiler control loops. Older terminal setups required external HART filter resistors spliced inline, adding extra splice points prone to corrosion in humid coastal and refinery environments.
Where you’ll typically find it:
- Coal-fired power plant boiler feedwater rack: Drum level & feed flow transmitter field termination
- Refinery crude distillation unit cabinet: Furnace pressure & product side stream flow AI wiring
- Onshore gas compressor station remote I/O rack: Pipeline differential pressure transmitter wiring
Integrated compression terminals and onboard HART pass-through cut loose-wire failures and eliminate extra inline component installation during commissioning.
Hardware Architecture & Under-the-Hood Logic
contains isolated passive signal conditioning circuitry only; no onboard microcontroller or ADC, all analog conversion handled by paired host board plugged directly to its rear DB36 connector.
- Field 4–20mA current enters compression terminal, passes through per-channel isolated shunt circuit on FTA PCB
- HART digital frequency signal rides atop analog current, routed unfiltered straight through DB36 to mainboard processing chip
- Isolation barrier blocks chassis ground loop noise between disparate field earth grids and rack backplane ground
- Conditioned raw analog values transfer across DB36 mating pins to onboard sigma-delta ADC for digital conversion
- Converted digital channel data gets packed onto I/A Fieldbus and sent upstream to rack FCP controller
Field Service Pitfalls: What Rookies Get Wrong
Over-Crimp Compression Terminals Damaging Internal PCB TraceNew technicians apply excessive compression plier force when seating field wires; internal copper PCB traces crack under terminal pad leading to intermittent channel dropouts after temperature swings.
- Quick Fix: Follow Foxboro spec torque for compression terminals; replace damaged if continuity fails post-wire retermination.
Stacking loop-powered passive transmitters alongside externally powered active transmitters on one FTA pulls channel current out of 4–20mA range, DCS flags constant underrange fault.
- Field Rule: Segregate active and passive instrument wiring onto separate terminal groups per cabinet wiring drawing.
Skip Shield Drain Wire Termination At FTA Chassis Ground LugUnbonded cable shield creates floating noise reference; nearby VFD motor switching injects high-frequency ripple causing noisy fluctuating PV readings on all 8 channels.
- Field Rule: Land all cable shield drain wires to designated chassis ground stud on housing, single-point earth per rack spec.
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.
