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GX WORKS3 • FX5U / GX WORKS3

Should I use USB or Ethernet to connect GX Works3 to an FX5U?

Use the interface supported by the exact CPU and site conditions. Ethernet is convenient for networked access; USB is useful for a direct local connection on supported FX5 models.

Practical explanation

The hardware manual gives separate procedures for Ethernet direct, Ethernet via hub and USB connections.

Choose the method that lets you positively identify the correct production controller.

Check in this order

  1. 1Confirm CPU connector availability.
  2. 2Select the matching interface in Current Connection Destination.
  3. 3Run Communication Test before any online operation.

Last reviewed: 2 October 2026

Official source: FX5S/FX5UJ/FX5U/FX5UC User's Manual (Hardware)

Related verified answers

How do I connect GX Works3 directly to an FX5U by Ethernet?How do I connect GX Works3 to an FX5U through a network switch?Should I read the PLC program before making an FX5U change?

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