Product Short Description
Product Identity
- Brand: FOXBORO (Schneider Electric DCS Platform)
- Model: RH911YY (Fibre Fieldbus Communication Extender Module)
Product Overview
RH911YY belongs to FOXBORO Compact 200 Series FCM fiber bus modules, designed to extend DCS field control bus signals via optical fiber, isolating electromagnetic interference between control room and field process equipmentparesource…
Description
Technical Specifications
- Communication Media: Single-mode optical fiber
- Max Transmission Distance: 2km baseplate-to-baseplate
- Bus Protocol: Foxboro proprietary Fieldbus for FCP280/FBM I/O racks
- Power Input: 24VDC ±10%, power consumption 7.2W
- Operating Temp: -20℃ ~ +60℃
- Humidity: 5%–95% RH, non-condensing
- Isolation: Full galvanic isolation, immunity to EMI/RFI/lightning surge
- Mounting: Standard DCS baseplate slot mounting
- Protection Grade: IP20 (indoor cabinet installation)
Functional Features
- Fiber optical signal conversion between copper fieldbus and long-distance fiber links
- Eliminates ground loop interference in chemical, power plant high-EMI sites
- Supports non-redundant single-module operation and redundant dual-module hot backup
- Built-in LED status indicators: power, bus link, fiber fault, communication active
- Compatible with full Compact 200 FBM I/O modules and FCP280 field controllers
Working Principle
The module receives electrical fieldbus signals from DCS baseplate, converts electrical pulses to modulated laser optical signals for fiber transmission; remote RH91xx receiver modules convert optical signals back to electrical bus signals for field I/O racks. Optical transmission cuts conductive noise coupling completely.
Structure & Material
- Housing: High-strength flame-retardant ABS plastic, gray industrial cabinet color
- Internal Circuit: Multi-layer PCB with surge suppression circuits, optical transceiver chipset
- Connectors: ST-type fiber optic ports, screw terminal power connectors, baseplate gold-plated bus edge connector
- Weight: 0.45kg
Installation Requirements
- Install inside sealed electrical control cabinet, DIN rail/baseplate slot lock-in mounting
- Fiber cable routing separated from high-voltage power cables (≥30cm clearance)
- Avoid direct sunlight, dust accumulation, corrosive gas environment
- Power wiring strictly 24VDC polarity protected, reverse power will not damage module
Application Scenarios
- Petrochemical DCS distributed control systems
- Thermal power plant boiler/turbine remote field I/O extension
- Offshore platform process control long-distance signal transmission
- Mining plant high electromagnetic interference process monitoring
Operation & Maintenance Notes
- Periodically clean fiber port dust with optical fiber cleaning swabs to avoid signal attenuation
- Check LED fault indicator monthly; red fiber fault light means fiber breakage or connector contamination
- Do not bend fiber cable with bending radius less than 15x cable outer diameter
- Module cannot be repaired on-site; replace whole unit when internal optical transceiver fails
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