Honeywell TC-RPFM01 | ControlNet Fiber Module

Product Overview

This fiber module converts electrical ControlNet signals into optical pulses for long-distance transmission. Industrial networks often require fiber-optic links to overcome electromagnetic interference and distance limitations. The TC-RPFM01 interfaces directly with ControlNet coaxial trunk lines and fiber-optic cabling. Its rugged design ensures reliable operation in electrically noisy plant environments. Network engineers can deploy this module to interconnect control rooms across large facilities. The unit supports both ring and star fiber topologies for flexible system architecture.

Technical Specifications

Parameter	Specification
Communication Protocol	ControlNet (IEC 61158-compliant)
Data Rate	5 Mbps (fixed)
Fiber Connector Type	ST (dual, transmit/receive)
Fiber Type	Multimode, 62.5/125 µm or 50/125 µm
Maximum Fiber Distance	3000 meters (multimode)
Coaxial Connector	BNC (RG-6/U or RG-11/U)
Coaxial Cable Distance	1000 meters maximum
Input Voltage Range	18–32 VDC
Power Consumption	≤4.5 W
Optical Wavelength	820 nm (LED source)
Optical Output Power	–20 dBm minimum
Receiver Sensitivity	–32 dBm maximum
Operating Temperature	0°C to +60°C
Storage Temperature	–40°C to +85°C
Dimensions (W x H x D)	40 mm x 130 mm x 145 mm
Weight	0.42 kg
Mounting Type	DIN-rail or panel mount
Status Indicators	Power, Link, Activity, Fault

Signal Conversion and Optical Transmission

The TC-RPFM01 performs electrical-to-optical conversion with less than 1 microsecond of propagation delay. This module reshapes and retransmits incoming ControlNet frames without altering their content. Its LED light source emits at 820 nanometers for standard multimode fiber compatibility. The receiver detects optical signals with sensitivity down to –32 dBm. Automatic gain control maintains consistent output levels despite cable attenuation variations.

Network Topology and Repeater Function

This fiber module operates as a ControlNet repeater to extend network spans significantly. The unit supports up to five repeaters in series for maximum system reach. Ring topology implementation enables redundant path routing for mission-critical applications. The module forwards network access tokens and data frames transparently. Star configurations allow central hub connections to multiple remote locations.

Power and Energy Considerations

The adapter consumes a maximum of 4.5 watts under full optical transmission load. Internal filtering capacitance stores 330 µF for transient ride-through capability. The unit accepts a wide 18–32 VDC range to accommodate various power sources. Reverse polarity protection safeguards the module from wiring errors. Thermal derating automatically reduces output if internal temperatures rise above 70°C.

Diagnostic Monitoring and Status

Dual-color LEDs indicate link status and communication activity on each interface. The module reports fiber receive power levels through diagnostic registers. A fault relay contact activates upon loss of optical or coaxial signal. The unit logs error counters for CRC errors and frame retries. Users can access diagnostic data via the ControlNet network management software.

Mechanical Construction and Cable Connections

The 40-millimeter wide housing fits standard DIN rails or panel mount brackets. ST-type fiber connectors provide secure locking with positive engagement. BNC connectors feature bayonet locking for vibration-resistant coaxial termination. Weighing 420 grams, this module requires minimal structural support. The front-panel layout places all connectors in a single row for easy access.