Description
Foxboro FCM2F2 RH914YZ
Technical Specifications:
- Power Supply: 24 VDC from DCS rack backplane
- Fieldbus Type: FOUNDATION Fieldbus H1, 31.25 kbit/s
- Number of Fieldbus Segments: 2 isolated H1 segments
- Max Field Devices per Segment: Up to 16 fieldbus instruments
- Fieldbus Power: Isolated built-in power supply for each segment
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: -40 °C to +85 °C
- Mounting: Plug-in module for Foxboro I/A Series rack
- Galvanic Isolation: Isolation between DCS backplane and each fieldbus segment
Function Features:
- Supply isolated power for FOUNDATION Fieldbus H1 field instruments
- Bidirectional communication with fieldbus transmitters, analyzers and valve positioners
- Upload process variables, device status and diagnostic alarms to DCS controller
- Download control output commands and setpoints to fieldbus valve positioners
- Built-in short circuit protection for each fieldbus segment
- Support fieldbus device parameterization and online diagnostics
- LED indicators for power, fieldbus communication and segment fault
- Hot swap function for module replacement without DCS shutdown
Application Scenarios:
- Refinery continuous distillation process control
- Chemical plant reactor and pipeline fieldbus control
- Power plant boiler fieldbus instrument monitoring
- LNG plant process measurement and control
- Pharmaceutical batch process DCS fieldbus systems
Material Composition:
- Main PCB: Multilayer FR4 fiberglass printed circuit board with conformal coating
- Core Components: Fieldbus communication controller, isolated power supply circuits
- Connectors: Gold-plated edge connector for DCS rack backplane
- Front Panel: Flame retardant plastic panel with LED indicator windows
- Passive Components: Surge suppression devices, high precision resistors and capacitors
Structural Features:
- Plug-in card form factor for Foxboro I/A series rack chassis
- Front panel with LED status indicators and module part number marking
- Rear gold-plated edge connector for backplane power and DCS internal bus
- Internal electrical isolation between two fieldbus segments
- Plastic locking latches for secure insertion and extraction
- PCB conformal coating protects circuits from dust and moisture
Working Principle: The module receives power and DCS bus data from rack backplane. Two independent isolated power circuits supply power to two FOUNDATION Fieldbus H1 segments. The fieldbus communication chip exchanges data with all field instruments on each segment. Process measurement values and device diagnostic data are transmitted to DCS controller. Control commands from DCS controller are converted to fieldbus frames and sent to field valve positioners. Short circuit protection cuts off segment power immediately when fieldbus cable short fault occurs.
Installation Requirements:
- Insert module into compatible Foxboro I/A series DCS rack
- Wear anti-static wristband during module handling
- Use shielded FOUNDATION Fieldbus H1 cable for field wiring
- Install fieldbus terminators at both physical ends of each bus segment
- Separate fieldbus signal cables from high voltage power cables
- Complete rack protective earth connection
- Keep cabinet ambient temperature below +60 °C
Usage Notes:
- Configure fieldbus device list and segment parameters via Foxboro DCS configuration software before commissioning
- Check fieldbus cable polarity during field instrument wiring
- Calculate fieldbus load to ensure power budget meets instrument requirements
- Backup fieldbus device configuration after commissioning
- Disconnect rack power before removing module if hot swap function is not used
- Inspect fieldbus terminator and cable insulation during plant outage inspection
