Foxboro FBM41A / FBM42C (P0902XA‑0C / FBM42C)

60 VDC 8‑Channel Isolated Discrete Input/Output Module

Specifications & User Guide (Copy‑Ready English)

General

Models: FBM41A (P0902XA‑0C) / FBM42C (high‑power variant)

System: Foxboro I/A Series / EcoStruxure Foxboro DCS

Type: 8‑channel galvanically isolated discrete (60 VDC) I/O modules

Difference:

FBM41A: 8DI + 8DO, standard‑power outputs

FBM42C: 8DI + 8DO, high‑power outputs (enhanced current rating)

Redundancy: 1:1 hot‑swap redundant capable

Hot Swap: Supported (no system shutdown)

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

Environment: Class G3 (harsh industrial)

Operating Temp: 0 °C to +60 °C

Storage Temp: −40 °C to +85 °C

Humidity: 5–95 % non‑condensing

Enclosure: Die‑cast aluminum, IP20 rated

Dimensions: 140 mm × 165 mm × 45 mm

Weight: 0.68 kg (FBM41A); 0.75 kg (FBM42C)

Common I/O Specifications

Configuration: 8DI + 8DO (channel‑to‑channel & channel‑to‑ground isolated)

Isolation: 600 VAC (1 min)

Status LEDs: 8 channel (ON/FAULT) + module RUN/FAULT

Termination: P0500RY / RH914TG TA (order separately)

Discrete Inputs (8 channels, both models)

Signal Type: Voltage monitor (15–60 VDC)

On‑State: 15–60 VDC; Off‑State: 0–5 VDC

Input Current: 2–6 mA @ 24 VDC

Debounce: Configurable (4 / 8 / 16 / 32 ms)

Open‑Circuit Voltage: 24 VDC ±20 %

Short‑Circuit Current: ≤5 mA

Discrete Outputs (8 channels)

FBM41A (Standard)

Type: Solid‑state switch (external ≤60 VDC)

Rating: 0.25 A / channel; 2 A total max

On‑Resistance: ≤1 kΩ

Off‑Leakage: ≤0.25 mA

Overload Protection: Per channel, auto‑recovery

FBM42C (High‑Power)

Type: High‑current solid‑state switch (external ≤60 VDC)

Rating: 2.5 A / channel; 15 A total max (upgraded from FBM42A)

On‑Resistance: ≤0.3 Ω @ 1 A

Off‑Leakage: ≤0.5 mA

Short‑Circuit Handling: 1‑s shutdown on overload; enhanced thermal dissipation

Power

Supply: 24 VDC (±5 % / −10 %), redundant

Consumption:

FBM41A: 9 W (single); 14 W (redundant)

FBM42C: 13 W (single); 19 W (redundant)

Heat Dissipation:

FBM41A: 8.5 W (single); 13 W (redundant)

FBM42C: 12.2 W (single); 18 W (redundant)

Communication

Fieldbus: Redundant 2 Mbps backplane (I/A Series)

Protocol: Foxboro proprietary

Data Update: 50 ms (default)

Typical Applications

FBM41A: Standard 24–60 VDC on/off control (solenoids, motor starters, contactors); status monitoring (limit/pressure switches).

FBM42C: Heavy‑duty 60 VDC loads (large solenoids, DC motors, heaters, motorized valves); high‑current process skids and legacy system migration.

Key Differences Summary

FBM41A: 0.25 A/channel, 2 A total; general‑purpose, cost‑effective.

FBM42C: 2.5 A/channel, 15 A total; high‑power, heavy loads, upgraded from FBM42A.