Foxboro FBMSSW (System Switch Module)

Copy-Ready English Specification

General

Model: FBMSSW

System: Foxboro I/A Series DCS

Type: Redundant System Switch Module (IAH/HSR)

Role: Redundant communication switch between controllers and I/O subsystems

Redundancy: 1:1 redundant, automatic failover

Hot Swap: Supported

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

Environment: Class G3 (harsh industrial)

Operating Temp: −40 °C to +70 °C

Storage Temp: −40 °C to +85 °C

Humidity: 5–95 % non‑condensing

Dimensions: 220 mm × 160 mm × 80 mm

Weight: 2.0 kg

Communication

Protocols: IAH (I/A Highway), HSR (High‑Speed Redundant)

Switching Speed: <10 ms (automatic failover)

Redundant Paths: Dual independent communication links

Diagnostics: Status LEDs for COMM/RUN/FAULT

Isolation: Galvanic isolation between paths

Electrical

Supply: 24 VDC (±5 %), redundant

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

Key Features

Redundant Communication: Dual paths eliminate single points of failure

Fast Failover: <10 ms switchover ensures continuous operation

Harsh Environment: Class G3 rated for industrial conditions

Diagnostic LEDs: Real‑time status for maintenance

Hot‑Swap: Replace module without system shutdown

Compact Design: Space‑saving for cabinet installation

Applications

Critical Control Loops: Redundant communication for critical processes

High‑Availability Systems: Power, oil & gas, chemical, pharmaceutical

Controller‑to‑I/O Link: Redundant connection between I/A controllers and FBMs

System Migration: Upgrade existing I/A systems with redundant communication

FBMSSW vs FBM232

FBMSSW: System switch (IAH/HSR redundancy)

FBM232: Ethernet communication module (non‑redundant)