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The FOXBORO FBM04 is a fieldbus-mounted I/O and signal-isolation card for the Foxboro I/A Series Distributed Control System (DCS). It interfaces 4–20mA field instrumentation to the control processor over the I/A Series fieldbus, providing electrical isolation, signal integrity, and stable analog-loop performance for long-life process automation assets.
Key Features
- Legacy analog I/O / fieldbus interface card for the Foxboro I/A Series DCS
- Supports 4–20mA analog field signals (transmitters, valves, loop controllers)
- Fieldbus-connected I/O module with channel-level signal isolation
- Reduces ground loops, EMI, and transient noise on analog loops
- Designed for continuous process control in harsh industrial environments
- Hot-swap capable when installed in compatible I/A Series bases
Technical Specifications
- Reference: FBM04
- Brand: FOXBORO
- Product Type: Legacy analog I/O / fieldbus isolator card
- Platform: Foxboro I/A Series DCS
- Signal Type: 4–20mA DC analog (input/output dependent on FBM configuration)
- Fieldbus: I/A Series Fieldbus Module (FBM) interface
- Isolation: Channel-to-bus and field-to-control isolation
- Supply: 24V DC typical (19–30V DC range, per I/A field device class)
- Accuracy: ±0.1% FS typical (module-class, configuration dependent)
- Operating Temp: –20°C to +70°C (industrial grade)
- Humidity: 5–95% RH, non-condensing
- Mounting: I/A Series baseplate / DIN-mounted FBM carrier
Installation Notes
- Verify the exact FBM04 revision and firmware label against your existing I/A Series rack before purchase or swap.
- Confirm 4–20mA loop wiring, termination assembly, and fieldbus node address before insertion.
- De-energize or use controlled hot-swap procedure per site maintenance rules.
- Seat the module in the correct FBM base slot; do not mix with incompatible FBM generations.
- Restore power and check OK/FAULT LEDs, then validate analog readings in the CP before returning the loop to service.
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