The FBM216b sits on the I/A Series FBM baseplate and communicates with the control processor over the redundant Fieldbus. Depending on the installed configuration, it serves as an analog/digital/hybrid I/O interface module—conditioning field signals and passing them to the DCS, or driving outputs to the field through a matched termination assembly (TA).
It is not a standalone PLC CPU. The physical module is the active FBM; field wires land on the separate TA, connected via termination cable. For maintenance, the goal is 1:1 swap with no rewiring or logic change.
Key Specifications
- Brand: Foxboro
- Model: FBM216b
- Family: I/A Series / Foxboro Evo FBM field I/O
- Type: Fieldbus I/O module (FBM) — analog/digital variant by configuration
- Bus: I/A Series redundant Fieldbus (proprietary, ~268.75 kbps class)
- Power: Backplane / 24 V DC class (confirm on label)
- Mounting: FBM baseplate / rack slot (guide-rail seated)
- Terminals: No direct field terminals—uses TA + termination cable
- Isolation: Channel/group isolation per FBM type (600 V ac class with matched TA)
- Indicators: Status/Ready/Fail LEDs (typical FBM)
- Environment: 0…60 °C (some TA -20…70 °C), 5–95% RH non-condensing
- Protection: IP20 in-cabinet
Key Features
- Fieldbus-Connected: Redundant Foxboro fieldbus interface to CP/controller
- Modular Swap: Hot-swap capable in redundant racks (verify site policy)
- Signal Conditioning: Filtering/isolation for analog or discrete field signals
- TA Separation: Field wiring stays on termination assembly during module swap
- Diagnostic LEDs: Fast fault isolation (comms / power / channel)
- Industrial Build: Conformal-coated, DCS-grade for continuous process duty
Typical Applications
- I/A Series DCS in petrochemical, power, pulp & paper, pharma
- Analog acquisition (mA, RTD, TC) or discrete I/O per FBM variant
- Turbine/compressor/burner management aux I/O
- Legacy Foxboro cabinet retrofit and emergency spare stock
- Process skids with Foxboro Evo migration paths
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