Product Description:

The FUB-DR2 is a driver and receiver module produced by Okuma for the FUB Servo Modules series. Installed into CNC or motion-control racks, the board manages high-speed optical signaling between servo amplifiers and the machine controller so position and status data can circulate without electrical noise. Within an automation cabinet, the module’s purpose is to convert fiber-optic field messages into differential electrical levels and back again, allowing the control system to supervise multiple axes with deterministic timing.

The board function is classified as a Driver/Receiver, meaning it regenerates inbound light pulses and drives outbound ones on the same backplane cycle. Four discrete I/O sockets are provided; the 4 connections marked XB4, XB5, XB6, XB7 accept conventional wired signals such as limit switches or encoder alarms. Network traffic moves through the proprietary Fieldnet protocol, so each message is framed for real-time servo coordination rather than standard Ethernet. For optical cabling, the board exposes the keyed connector labeled XB2, which provides a fixed connection point for terminating duplex fibers.

Two optical transceiver channels are active, so the optical port count is 2; this dual link supports separate transmit and receive paths and maintains galvanic isolation between drive cabinets. Physically, the assembly is supplied in a Control Board form factor with plated edge contacts that slide into the FUB backplane, while an internal ribbon bus hooks to the logic layer through connector XB1. Fiber optic cable is the only signal medium, eliminating ground loops that can disturb analog feedback circuits. The populated PCB, stiffener, and front handle together weigh 1.060 kg, permitting quick insertion and extraction without exceeding the card retainer’s load rating.