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Mitsubishi Electric FX3U-USB-DB — PLCs (Programmable Logic Controllers)

Mitsubishi FX3U-USB-DB USB Communication Expansion Board, Mi

MPNFX3U-USB-DB

Mitsubishi FX3U-USB-DB USB Communication Function Expansion Board, Mini-B plug female, baud rates 9600–115200 bps, photocoupler isolation, 15 mA at 5 VDC.

$98.00Ref. price · indicative, final on quote
Mitsubishi Electric FX3U-USB-DB datasheet (PDF)
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

FX3U-USB-DB — Specifications
ParameterValue
PortUSB (Mini-B plug female)
Model noFX3U-USB-BD
Baud rate9600/19200/38400/57600/115200 bps
IsolationPhotocoupler isolation (Between communication line and CPU)
Model typeUSB Communication Function Expansion Board
Current consumption15mA / 5V DC (5V DC power is supplied from the internal power supply of PLC), 30mA / 5V DC (5V DC power is supplied from the USB connector of personal computer)
Transmission standardUSB2.0 (For full speed)
Dimensions (HxWxD), approx4.61cm x 1.96cm x 5.35cm

Product details

The FX3U-USB-DB is a USB communication expansion board for the Mitsubishi FX3U PLC series, model FX3U-USB-BD. It adds a USB Mini-B port to the CPU, supporting baud rates from 9600 up to 115200 bps for programming or data exchange with a PC. Photocoupler isolation between the communication line and the CPU protects the PLC logic from ground loops and transients on the USB cable — a common failure point when connecting a laptop to a live panel. Power draw is 15 mA at 5 VDC when powered from the PLC internal supply, or 30 mA at 5 VDC when bus-powered from the PC's USB connector. The board complies with USB 2.0 full-speed standard.

Dimensions are 4.61 cm x 1.96 cm x 5.35 cm — it mounts directly into the FX3U CPU's expansion slot without additional DIN rail space. The Mini-B connector is recessed; verify cable clearance if the PLC is in a tight enclosure.

Frequently asked questions

What is the port type on the FX3U-USB-DB?

The port is a USB Mini-B plug female connector.

What baud rates does the FX3U-USB-DB support?

It supports 9600, 19200, 38400, 57600, and 115200 bps.

Does the FX3U-USB-DB provide isolation?

Yes, photocoupler isolation is provided between the communication line and the CPU.

MPN
FX3U-USB-DB