Foxboro DM400YJ (FBM08) – 120VAC Input Module

Product Overview

Model: DM400YJ (FBM08)

Type: 8-channel isolated AC digital input module

System: Foxboro I/A Series DCS

Specifications

Input Voltage: 120VAC (nominal), 50/60Hz

Channel Count: 8 isolated input channels

Input Type: Dry contact / 120VAC voltage input

Isolation: 250VACrms (channel-to-channel, channel-to-ground)

Response Time: ≤10ms (per channel)

Backplane Power: 24VDC ±10%

Power Consumption: ≤3.5W

Operating Temp: 0°C to +55°C (32°F to 131°F)

Storage Temp: -40°C to +85°C (-40°F to 185°F)

Humidity: 5%–95% RH, non-condensing

Dimensions (D×W×H): 18" × 5.5" × 1.5"

Weight: ~2.3 kg (5.0 lbs)

Hot Swap: Supported (online replacement)

Diagnostics: Open/short circuit detection, channel status LED

Installation & Wiring

Mounting: Single-slot, vertical installation in I/A Series 100-series chassis; allow ≥50mm top/bottom clearance for cooling.

Cable: Shielded twisted pair (18–22 AWG); max length 300m.

Shielding: Shield grounded at one end only (control room side).

Separation: Keep AC input cables ≥30cm from DC/power cables to reduce interference.

Terminals: Torque terminals to 0.8–1.0 N·m; avoid loose connections.

ESD: Use anti-static wristband during handling; do not touch gold contacts.

Operation & Maintenance

LED Indicators:

PWR: Green = Backplane power OK

RUN: Green blinking = Normal communication

FAULT: Red = Channel fault (open/short) or communication error

Redundancy: Supports dual-module redundant pairing; switchover <50ms.

Maintenance:

Inspect terminals annually; re-torque if needed.

Clean dust from module/chassis every 6–12 months.

End-of-life: Discontinued; replace with spare module (no field repair).

Compatibility

Direct Replacement: FBM08, DM400YJ-0E

System Compatibility: I/A Series 100-series; works with CP10, CP30, CP60 controllers.

Upgrade Alternative: FBM238 (I/A 200-series, Ethernet-based digital input module).

Spare Notes: Only refurbished/used units available; DM400YJ, DM400YL, DM400YP are pin-compatible variants.