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FBM208

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Foxboro FBM208 is a redundant four-channel analog I/O module with output readback for high-availability 0-20 mA Foxboro DCS control loops.
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Technical specifications for FBM208

  • Manufacturer:
    Invensys
  • Part Number:
    FBM208
  • Product Family:
    Foxboro
  • Product Type:
    Redundant Four-Channel Analog Input/Output Module with Output Readback
  • Stock:
    1
  • Redundancy:
    Two FBM208 modules in adjacent baseplate slots
  • Analog inputs:
    4 per redundant pair
  • Analog outputs:
    4 per redundant pair, with output readback
  • Input/output range:
    0 to 20.4 mA DC nominal
  • Input accuracy:
    ±0.3% of span including redundant-adapter resistor
  • Input impedance:
    60 Ω nominal
  • Output accuracy:
    ±0.05% of span
  • Output load:
    750 Ω maximum
  • Output resolution:
    13 bits
  • Output processing delay:
    30 ms maximum
  • Readback response:
    Marks output BAD above ±2% deviation; cuts channel power above +2%
  • Pair power consumption:
    10 W maximum
  • Pair heat dissipation:
    7 W maximum
  • Module Fieldbus:
    Redundant 2 Mbps
  • Input power:
    24 VDC +5%, -10%
  • Operating temperature:
    -20 to +70°C
  • Storage temperature:
    -40 to +70°C
  • Relative humidity:
    5 to 95%, noncondensing
  • Contamination class:
    ISA-S71.04 Class G3
  • Dimensions:
    4.5 × 10.2 × 10.4 cm
  • Required redundant adapter:
    RH916NN
  • Operating altitude:
    -300 to +3,000 m
  • Storage altitude:
    -300 to +12,000 m
  • Vibration:
    0.75 g from 5 to 500 Hz
  • Weight:
    0.284 kg
  • Tariff Code:
    8538900000
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Readback Protection Redundant Hardware Loop Commissioning Application
  • Use FBM208 only for its documented redundant analog I/O function with output readback
  • Confirm the exact module identity, termination hardware and cable before replacement
  • Preserve field wiring, channel configuration, diagnostics and control state before removal

Foxboro FBM208 is a redundant four-channel analog I/O module with output readback for high-availability 0-20 mA Foxboro DCS control loops.

FBM208 is the exact functional designation; RH914TB is the current module part number; RH916NN is separate redundant-adapter hardware. FBM208b is a different model and is not used here.

Before replacement, verify the exact label, termination hardware, cable, signal limits, field wiring, saved configuration and supported system environment.

Availability, condition, price, and shipping time for FBM208 are confirmed during quotation.

Foxboro FBM208 Manuals, Datasheets, Links

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

  • Treat output readback as a core FBM208 selection requirement
  • Investigate any output deviation greater than ±2% before returning a loop to service
  • Follow an approved procedure when testing the over-readback power cut
  • Install the pair in adjacent baseplate slots
  • Use the documented RH916NN redundant adapter
  • Preserve termination, cable and active/tracker identities
  • Inject every used input and command every used output
  • Measure actual output current independently and compare readback
  • Verify scaling, alarms, failover, BAD status and diagnostics
  • High-availability single-input/single-output control
  • Redundant 4-20 mA input acquisition
  • Readback-monitored redundant analog output control
Description
Foxboro FBM208 is a redundant four-channel analog I/O module with output readback for high-availability 0-20 mA Foxboro DCS control loops.

Its documented channel architecture, signal limits and diagnostics support model-specific Foxboro DCS field I/O service without changing the official identity of FBM208.

Before installation, verify the complete nameplate, order-number relationship, termination hardware, cable, field power, saved configuration, grounding and system compatibility.
Alternative Names
FBM208 FBM 208 Foxboro FBM208 Invensys FBM208 Invensys Foxboro FBM208 I/A Series FBM208 Foxboro FBM 208
Technical notes
FBM208 uses module part RH914TB with the RH916NN redundant adapter; FBM208b is a different model. Verify the adapter, termination hardware, and adjacent-slot configuration before replacement.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What distinguishes FBM208 from a redundant analog I/O module without readback?
FBM208 monitors output current. A deviation above ±2% marks the output BAD, while an over-readback above +2% cuts channel power.
Are FBM208 and FBM208b the same module?
No. FBM208 is the RH914TB redundant four-input/four-output module with readback; FBM208b has different specifications.
Which redundant adapter is required for FBM208?
FBM208 uses the RH916NN redundant adapter and requires two adjacent baseplate slots.
What is the maximum output load for FBM208?
Each FBM208 output supports a maximum load of 750 ohms, including field wiring and device burden.
What should be recorded before servicing FBM208?
Record both module labels, active/tracker state, slot positions, adapter, scaling, readback status, alarms and field wiring.
How should FBM208 output readback be tested?
Command a controlled output, measure the loop current independently, and confirm the readback, BAD indication and protective response.
Can FBM208 be installed in any single baseplate slot?
No. FBM208 redundancy requires two modules in adjacent slots with the correct adapter and database configuration.

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