Foxboro FBM3 (FBM03, P0400YD) – Specifications & User Guide (English, Copy‑Ready)

General

Model: FBM3 (also known as FBM03, P0400YD)

System: Foxboro I/A Series DCS

Type: 8‑Channel Isolated RTD Input Module

Function: Precision temperature measurement via RTD sensors

Redundancy: 1:1 redundant capable

Hot Swap: Supported (no system shutdown)

Certification: CE, ATEX, CSA; Class 1 Div 2 / Zone 2

Environment: Class G3 (harsh industrial)

Operating Temp: −40 °C to +70 °C

Storage Temp: −55 °C to +85 °C

Humidity: 5–95 % non‑condensing

Dimensions: 32 mm × 117 mm × 132 mm

Weight: 0.6 kg

Input Specifications

Channels: 8 isolated, independent

Sensor Type: Platinum (Pt100/Pt1000), Nickel (Ni120), Copper RTD

Input Range: 0–320 Ω; Temperature −200 °C to +850 °C (sensor‑dependent)

Sensor Connection: 2‑wire, 3‑wire, 4‑wire (per channel)

Sensor Current: 0.75 mA DC per channel

Resolution: 16‑bit

Accuracy: ±0.025 % of span (±0.08 Ω); ±0.25 °C conformity

Temp Coefficient: ±25 ppm/°C

Isolation: 1500 VDC channel‑to‑channel & channel‑to‑ground

Update Rate: 100 ms (configurable)

Common Mode Voltage: Up to 30 VAC / 60 VDC

Power

Supply: 26–42 VDC (redundant)

Consumption: 9 W (max)

Heat Dissipation: 9 W (max)

Communication

Interface: Redundant 2 Mbps Fieldbus (backplane)

Protocol: Foxboro I/A Series proprietary

Basic Usage & Installation

Mount: Snap into standard I/A rack baseplate; ensure full seating.

Wiring:

Connect RTD sensors to termination assembly (TA).

Use 2‑wire, 3‑wire, or 4‑wire per channel (no mix of 3‑wire with 2/4‑wire on same module).

Separate sensor cables from high‑power cables to reduce noise.

Configuration (I/A Series Software):

Set sensor type (Pt100, Ni120, etc.) per channel.

Select wire mode (2/3/4‑wire).

Set input range and filter time.

Enable/disable diagnostics (sensor open/short).

Operation:

Check LED indicators for module/channel status.

Monitor temperature values in HMI; verify alarms.

Maintenance: Hot‑swap faulty module; no system shutdown required.

Typical Applications

Precision temperature monitoring in heat treatment, chemical, power, and pharmaceutical processes.

Replacement for legacy Westinghouse WDPF RTD modules during migration to Foxboro I/A Series.