GE IC690RFH008 – Remote I/O Fiber Optic Head for Series 90-30 PLC Systems
Description
The GE IC690RFH008 is a Remote Fiber Optic Head(RFH)module designed for use with GE Fanuc Series 90-30 programmable logic controller(PLC)systems.It enables high-speed,noise-immune communication between a Series 90-30 CPU base station and remote I/O racks over multimode fiber-optic cable,extending reliable control to distances up to 1.2 miles(2 km)—ideal for electrically noisy or geographically dispersed industrial environments such as power plants,water treatment facilities,mining operations,and large manufacturing complexes.
The IC690RFH008 operates as the fiber interface at the remote I/O location,converting electrical signals from local I/O modules into optical signals for transmission back to the master controller(typically via an IC690CMM311 or IC690CMM321 communications module in the main rack).It supports daisy-chain or star topologies,allowing multiple remote stations on a single fiber loop.
Note:The IC690RFH008 must be paired with a compatible master fiber module(e.g.,IC690RFM008)in the CPU rack.It does not process logic—it functions purely as a transparent I/O extender.
Application Scenarios
At a municipal wastewater plant in California,critical pump and valve controls were spread across a 1,500-foot treatment basin.Copper-based remote I/O suffered frequent communication errors due to ground potential differences and VFD-induced EMI.After installing IC690RFH008 units at three remote junction houses linked via multimode fiber to a central Series 90-30 rack:
Communication errors dropped from 12/day to zero
Ground loop issues were eliminated
Maintenance teams avoided trenching new shielded cables
The upgrade extended the life of the legacy control system by 10+years at 40%of the cost of a full migration.
Parameter
Main Parameters Value/Description
Product Model IC690RFH008
Manufacturer GE Fanuc Automation→Emerson Automation Solutions
Product Category Remote I/O Fiber Interface–Series 90-30 Platform
Function Fiber-optic extension for remote I/O racks
Compatible Master Module IC690RFM008(in CPU rack)
Fiber Type 62.5/125µm multimode(OM1)
Connector Type ST connectors(bayonet-style,robust for industrial use)
Max Distance 2 km(1.2 miles)point-to-point
Data Rate Up to 1.536 Mbps(Series 90-30 Genius bus speed)
I/O Capacity per RFH Supports full Series 90-30 remote rack(up to 8 I/O modules)
Power Supply 5 VDC from remote I/O baseplate(via IC693BEM331 or similar)
Operating Temperature 0°C to+60°C
Isolation Full galvanic isolation between electrical and optical domains
Diagnostics Power OK and COMM LEDs on front panel
Technical Principles and Innovative Values
Innovation Point 1:EMI Immunity for Harsh Environments
By replacing copper with fiber,the IC690RFH008 eliminates susceptibility to electromagnetic interference from motors,transformers,and lightning—critical in substations and heavy industry.
Innovation Point 2:Long-Distance I/O Without Repeaters
Achieves 2 km reach without signal regeneration,reducing cost and failure points compared to RS-485 or coaxial solutions.
Innovation Point 3:Transparent Integration
Requires no changes to PLC logic—remote I/O appears as local addresses in the program,simplifying engineering and troubleshooting.
Innovation Point 4:Intrinsic Safety&Ground Loop Elimination
Fiber provides dielectric separation between buildings or equipment grounds,preventing ground loops and enabling safe inter-building links.
Application Cases and Industry Value
A hydroelectric dam in Canada used IC690RFH008 modules to connect spillway gate controls(located 1.8 km from the control room)to a central Series 90-30 system.The fiber link:
Survived repeated lightning strikes that damaged prior copper networks
Enabled real-time position feedback with<50 ms latency
Met FERC cybersecurity requirements by avoiding wireless alternatives
The solution avoided a$1.5M control system overhaul and ensured compliance with dam safety regulations.
Related Product Combination Solutions
Master Module:IC690RFM008(installed in CPU rack)
Remote Baseplate:IC693CHS391 or IC693CHS398(with expansion capability)
I/O Modules:All standard Series 90-30 I/O(e.g.,IC693MDL654 digital output)
Communications Processor:IC690CMM311 or IC690CMM321(for Genius bus management)
Fiber Cabling:Duplex 62.5/125µm multimode with ST connectors
Engineering Software:Logicmaster 90 or Proficy Machine Edition(for configuration)
Modern Migration Path:PACSystems RX3i with IC695PNC001(Profinet)or IC695RMX128(redundant fiber)
Spare Strategy:Keep matched RFH/RFM pairs to ensure compatibility
Installation,Maintenance,and Full-Cycle Support
Installation Best Practices:
Use duplex multimode fiber with ST connectors(ceramic ferrule recommended)
Maintain minimum bend radius(>30 mm)to avoid signal loss
Clean fiber ends with lint-free wipes and>90%isopropyl alcohol
Verify link with optical power meter(typical loss<3 dB over 2 km)
Maintenance Tips:
Inspect connectors annually for dust,scratches,or moisture
Monitor COMM LED—if blinking erratically,check fiber continuity
Replace rubber strain reliefs if cracked(common failure point)
Every IC690RFH008 we supply is:
Functionally tested with Series 90-30 master and I/O modules
Verified for optical transmit/receive power levels
Inspected for connector wear and PCB integrity
Supplied with original documentation and test report
We offer a 12-month warranty,legacy software support,and expert assistance for network design or troubleshooting—even for systems installed decades ago.
Contact us for a customized solution—whether you’re extending I/O in a legacy plant,replacing failed RFH units,or planning a phased migration.With the GE IC690RFH008,you maintain reliable,long-distance control in the most electrically hostile environments—proving that sometimes,the best innovation is keeping a proven system running longer,safer,and smarter.
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