May 26, 2026

Foxboro FC9821X Product Description

The Foxboro FC9821X is a high-performance VMEbus-based industrial control processor module, originally developed by Foxboro (now part of Schneider Electric’s EcoStruxure portfolio) for the Foxboro I/A Series Distributed Control System (DCS). Designed as a legacy yet robust core controller for process automation, it delivers reliable real-time control, data processing, and system coordination for industrial applications. Built to withstand G3 harsh industrial environments, it ensures long-term stability and operational continuity in critical process control systems.

Description

Foxboro FC9821X Product Description

Product Overview

Basic Information

Manufacturer: Foxboro (Invensys, now Schneider Electric)
Model: FC9821X
Product Type: VMEbus Industrial Control Processor Module
Applicable System: Foxboro I/A Series DCS (legacy architectures), VMEbus-based industrial control systems
Mounting Style: 6U VMEbus rack-mounted, plug-in to standard VME backplane
Protection Rating: IP20 (designed for industrial cabinet installation)
Construction: Heavy-duty metal housing with conformal coating, providing resistance to vibration, dust, and corrosive gases
Certifications: CE, UL, CSA, ATEX compliant for hazardous area installations
MTBF: ≥100,000 hours
Weight: Approximately 1.8 kg
Country of Origin: United States

Function and Positioning

The FC9821X serves as a legacy core processing unit for Foxboro I/A Series DCS, positioned to execute real-time control logic, data acquisition, and system management tasks. Its primary role is to process complex control algorithms, manage I/O data flow, and facilitate communication between field devices, I/O modules, and upper-level monitoring systems. As a VMEbus-based controller, it supports multi-master bus arbitration with priority-based scheduling, ensuring efficient data transmission and task execution. It enables standalone or redundant operation, supporting 1+1 hot standby configurations for critical processes, and allows online configuration and firmware updates without disrupting production.

Core Performance Parameters

Processor: 32-bit industrial CPU (i486 DX2 66MHz), optimized for real-time industrial control
Memory: 8MB program RAM, 4MB data RAM, 2MB Flash ROM for firmware storage
Bus Interface: VMEbus compliant, supporting 32-bit data transfer at up to 40MB/s
Communication Interfaces: 10/100Mbps Ethernet (RJ45), RS-232 serial port, 4-channel HDLC fieldbus
Supported Protocols: Foxboro I/A Series Bus, Modbus RTU, TCP/IP, Foundation Fieldbus, HART
Control Capacity: Supports up to 128 analog and 128 digital I/O points; executes PID, sequential, and logic control
Environmental Ratings: Operating temperature 0°C to +60°C; G3 harsh environment compliant (vibration: 5-200Hz, 0.1g)
Power Supply: 5VDC ±5%, 3.3VDC ±5%; power consumption ≤50W
Redundancy: 1+1 module redundancy with automatic failover (switching time ≤100ms)

General Adaptable Accessories

VME Backplanes: Standard 6U VMEbus backplanes (4/8/16 slot), redundant VME backplanes for 1+1 controller configurations
Communication Cables: CAT5e Ethernet cables, RS-232 shielded twisted pair, industrial fiber optic cables for long-distance communication
Expansion Modules: VMEbus I/O expansion cards, serial port multiplexers, protocol conversion gateways for third-party device integration
Power Supply Units: VMEbus-compatible 5VDC/3.3VDC industrial power supplies, redundant power units for fault-tolerant systems
Mounting Accessories: 19-inch rack mounting brackets, anti-vibration kits, ESD protection modules for industrial cabinet installation

Applicable Equipment and Fields

The FC9821X is widely applied in legacy process industries that rely on Foxboro I/A Series DCS and VMEbus-based control systems. Key sectors include oil and gas (refining and petrochemicals), thermal power generation, chemical manufacturing, pulp and paper processing, water and wastewater treatment, and pharmaceuticals. It is ideal for retrofitting and maintaining existing industrial automation systems, enabling real-time data acquisition, process monitoring, and automatic control in large-scale production facilities.

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