Product Description:

Okuma’s FUB-DR3 belongs to the FUB Servo Modules series and is used as a discrete-output expansion unit inside the company’s CNC and motion platforms. It supplies power-transistor switching and relay signaling so machine controllers can drive contactors, indicator lamps, or interposing relays without additional interface boards. This arrangement lets the controller switch field devices directly from the module while keeping the I/O section compact.

The module accepts an operating bus of 24 VDC and draws a typical control current of 14 mA, allowing it to be powered directly from standard cabinet supplies. Its internal clock runs at 100 Hz, setting the scan rate used to refresh output states and time the power-sequence logic. The module provides 12 outputs, making it suitable for small groups of solenoids or pilot lights. Each point is driven by a power MOS IC, which provides low-loss switching while isolating processor signals from field wiring. An integrated Fieldnet interface links the board to the Okuma axis controller so state changes move across the backplane network without additional cabling.

For higher loads, every transistor channel is paralleled with a driver rated at 2 A at 24 VDC, while two mechanical relays handle circuits that need galvanic isolation: one contact is rated for 5 A at 30 VDC, 250 VAC and the second contact is limited to 2 A at 30 VDC, 250 VAC. A front-panel indicator marked Yellow OSCSTP lights if the oscillator stops, allowing a quick visual fault check. Signal integrity across longer backplane segments is supported by the built-in optical conversion module, and startup timing is coordinated by the integrated power-sequence function so downstream drives receive stable logic before they are enabled.