Foxboro FBM41A / FBM42A (P0902XA‑0C / P0902YA‑0C)

60 VDC 8‑Channel Isolated Discrete Input/Output Module

Specifications & User Guide (Copy‑Ready English)

General

Models: FBM41A (P0902XA‑0C) / FBM42A (P0902YA‑0C)

System: Foxboro I/A Series / EcoStruxure Foxboro DCS

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

Difference:

FBM41A: 8DI / 8DO (standard density)

FBM42A: 8DI / 8DO (high‑power output)

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); 0.72 kg (FBM42A)

I/O Channel Specifications (Common)

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

FBM42A (High‑Power)

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

Rating: 2.25 A / channel; 12 A total max

On‑Resistance: ≤0.4 Ω @ 1 A

Off‑Leakage: ≤0.5 mA

Short‑Circuit Handling: Unlimited duration; 1‑s shutdown on overload

Power

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

Consumption:

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

FBM42A: 12 W (single); 18 W (redundant)

Heat Dissipation:

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

FBM42A: 11.3 W (single); 17 W (redundant)

Communication

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

Protocol: Foxboro proprietary

Data Update: 50 ms (default)

Basic Installation & Usage

Mounting

Snap into standard I/A Series DIN rail or baseplate.

Secure latch; ensure full seating for backplane contact.

Wiring

DI: Connect 15–60 VDC sensors/switches; no common ground needed (isolated).

DO: Connect external 12–60 VDC source; positive to load, negative to module.

FBM42A: Use 16–12 AWG for high‑current loads.

Shielded twisted pair recommended; separate analog/digital cables.

Configuration (I/A Series Software)

Set DI debounce time and alarm thresholds.

Configure DO failsafe (hold / ON / OFF).

Enable diagnostics (open load, short circuit, overcurrent).

Assign redundancy role (primary/secondary) if applicable.

Operation

RUN (green): module ok; FAULT (red): error (comms/power/channel).

Channel LED: ON = active; FLASH = fault.

Monitor DI status and DO commands in HMI.

Maintenance

Hot‑swap faulty module (no shutdown; TA wiring intact).

Inspect TA wiring, shields, and grounds annually.

Update firmware via I/A Series software.

Calibration: Not required (factory‑calibrated; on‑board diagnostics).

Typical Applications

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

FBM42A: High‑power 60 VDC loads (large solenoids, DC motors, heaters); heavy‑duty process skids.

Key Differences Summary

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

FBM42A: 2.25 A/channel, 12 A total; high‑power, heavy loads.