Description
Product Introduction
Running a Symphony Plus system with I/O racks 500 m from the controller? The ABB RFO810 is the fiber optic repeater that extends the HN800 or CW800 modular bus up to 3 km without signal degradation.
This unit regenerates optical signals at 256 MHz (ColdFire MCF5475 processor), compensating for attenuation in HCS or POF cables. In field deployments of S+ I/O systems, we’ve seen this repeater handle 7 S800 cluster modems in a daisy chain without the dropout you get on electrical bus extenders. Redundant fiber ring topology means if one fiber drops, the other holds the bus—critical for turbine control or distributed power monitoring.
Installation & Configuration Guide
Phase 1—Pre-Installation (est. 10 min)
De-energize the Symphony Plus rack. Wait 5 minutes for capacitor discharge. Grab a 24 V DC multimeter, ESD wrist strap, and a camera. Export the current S+ I/O configuration. Photograph the existing fiber routing, termination modules (HBX01L/HBX01R), and rack layout—photo, photo, photo.
Phase 2—Removal (est. 5 min)
Label every fiber optic cable before disconnecting. Release the horizontal row module latch. Slide the RFO810 out carefully, keeping the fiber connectors clean. Inspect the POF/HCS connectors for dust or scratches.
Phase 3—Installation (est. 10 min)
Strap on your ESD gear. Verify the part number matches RFO810. Slide the module into the horizontal row base (RMU810), seat until the latch clicks. Reconnect fiber optic cables (observe ring topology: Tx→Rx, Rx→Tx). Install HBX01L at the left end and HBX01R at the right end of the bus. Run a pre-power checklist: supply voltage 24 V DC, ground continuity, no loose strands.
Phase 4—Power-On & Testing (est. 15 min)
Apply 24 V DC ±10%. Watch the LEDs: Power = green steady, Run = green flash, Fault = off (red = fault). Connect Symphony Plus configuration software (Control Builder or S+ I/O tool). Verify all S800 cluster modems appear on the bus. Run a functional test: poll each I/O module, confirm no communication errors, simulate a fiber cut (disconnect one fiber), verify redundant path holds. Confirm stable operation for at least 30 minutes. Log the swap in your maintenance record.
Troubleshooting quick-reference:
- No power LED → check 24 V DC supply and polarity
- Fault LED red → check fiber ring continuity, verify HBX01L/HBX01R termination
- Cluster modem dropout → inspect POF/HCS connectors, verify distance <3 km total
