May 26, 2026

Foxboro FEM100 Product Description

The Foxboro FEM100 (Part Number: P0973CA) is a high-performance Fieldbus Expansion Module designed exclusively for the FCP270 Field Control Processor in the Foxboro I/A Series DCS (Schneider Electric EcoStruxure). It serves as a dedicated I/O expansion unit that significantly extends the fieldbus connectivity and device capacity of the FCP270, enabling large-scale I/O integration in distributed process control environments. Engineered with a rugged extruded aluminum housing and industrial-grade components, it delivers reliable operation in ISA S71.04 G3 harsh industrial settings. The FEM100 provides four independent high-speed HDLC fieldbus channels, supporting up to 128 200 Series Fieldbus Modules (FBMs) per module—four times the standard FCP270 capacity. It supports redundant pairing for fault-tolerant communication, hot-swap installation, and DIN rail mounting, making it ideal for mission-critical applications requiring scalable, high-availability I/O connectivity.

Description

Foxboro FEM100 Product Description

Product Overview

Basic Information

Manufacturer: Foxboro (Invensys, now Schneider Electric)
Model: FEM100 (Part Number: P0973CA)
Product Type: Fieldbus Expansion Module, DCS I/O Expansion Unit
Applicable System: Foxboro I/A Series DCS (exclusively compatible with FCP270 Field Control Processor)
Mounting Style: Vertical DIN rail mounting; installs on 2-slot (P0973CG) or 4-slot (P0973CN) expansion baseplates
Protection Rating: IP20; extruded aluminum housing with conformal coating
Certifications: CE, UL, CSA compliant; meets ISA S71.04 G3 harsh environment standards
Communication Protocol: 2 Mbps HDLC (for 200 Series FBMs)
Power Supply: 24 VDC ±10% (21–26 VDC input); supports redundant independent power inputs
Power Consumption: ≤2.2 W (maximum per module)
Operating Temperature: -20°C to +70°C
Storage Temperature: -40°C to +85°C
Relative Humidity: 5% to 95% non-condensing
Vibration/Shock: Compliant with ISA S71.04 G3; 30 g half-sine shock (11 ms)
MTBF: ≥200,000 hours
Weight: Approximately 1.0 kg
Dimensions: 114 mm (H) × 60 mm (W) × 25 mm (D)
Country of Origin: United States

Function and Positioning

The FEM100 functions as the primary I/O expansion core for the FCP270, positioned to scale up fieldbus connectivity for large-scale, distributed process plants where standard FCP270 I/O capacity is insufficient. Its core role is to act as a communication bridge between the FCP270 and expanded FBM networks, providing four independent HDLC fieldbus channels to handle high-volume I/O data traffic. Each channel supports up to 32 200 Series FBMs, enabling a total of 128 FBMs per FEM100—eliminating the need for additional controllers in large I/O clusters. The FEM100 supports 1:1 redundant pairing with a second FEM100 module, ensuring seamless communication failover if a module or bus fault occurs, which enhances system availability for mission-critical processes. It also supports hot-swap installation and removal, allowing online maintenance without disrupting ongoing control operations. By extending the FCP270’s I/O reach, the FEM100 enables centralized control of remote I/O clusters, reduces network latency, and simplifies system architecture in large industrial facilities.

Core Performance Parameters

Fieldbus Channels: 4 independent expanded HDLC fieldbus channels
FBM Capacity: Up to 32 × 200 Series FBMs per channel; 128 FBMs total per FEM100
Communication Speed: 2 Mbps HDLC (optimized for 200 Series DIN-rail FBMs)
Controller Compatibility: Exclusive to Foxboro FCP270 Field Control Processor
Redundancy Support: 1:1 redundant pairing; seamless bus failover; redundant power input support
Data Handling: High-speed data multiplexing; real-time I/O data exchange with FCP270
Diagnostics: Multi-color LEDs for power, channel status, link activity, and fault indication; remote diagnostics via I/A Series System Manager
Hot-Swap Capability: Supported for online installation, removal, or replacement without process shutdown
Configuration: Software-configurable channel parameters via Foxboro I/A Series tools
EMI Compliance: Industrial-grade noise immunity (IEC 61000-4-2/3/4/5); G3 harsh environment compliant

General Adaptable Accessories

Expansion Baseplates: 2-slot expansion baseplate (P0973CG), 4-slot expansion baseplate (P0973CN) for DIN rail mounting
I/O Modules: 200 Series FBMs (analog input/output, digital input/output, HART, Foundation Fieldbus H1, PROFIBUS)
Communication Cables: 2 Mbps HDLC shielded twisted pair cables (FCP270-to-FEM100), redundant synchronization cables for FEM100 pairs, FBM baseplate connection cables
Redundancy Accessories: Redundant 24 VDC power supplies, fault-tolerant interconnection cables, bus terminators for HDLC fieldbuses
Mounting & Protection: DIN rail mounting kits, anti-vibration brackets, ESD protection modules, conformal coating kits
Spare Parts: Replacement aluminum housings, LED indicator assemblies, connector kits, power input terminals

Applicable Equipment and Fields

The FEM100 is designed for large-scale, continuous process industries requiring high-density, scalable I/O expansion with fault-tolerant communication. Key sectors include oil and gas (refining, petrochemicals, offshore platforms), thermal power generation, chemical manufacturing, pulp and paper, water and wastewater treatment, pharmaceuticals, metals and mining, and fertilizer production. It is ideal for controlling large remote I/O clusters, high-density process units, and distributed field devices in high-noise areas such as turbine halls, compressor stations, and outdoor process facilities. The FEM100’s G3 harsh environment rating, redundant operation, hot-swap capability, and large FBM capacity make it the preferred expansion module for FCP270-based systems demanding high availability, precise control, and future-proof scalability.

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