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COMMUNICATION • FX5U / GX WORKS3

How many Modbus slaves can an FX5U master connect?

Mitsubishi states up to 32 stations over RS-485 and one station over RS-232 for the FX5 Modbus master function.

Practical explanation

The practical network also depends on cable, termination, biasing, device loading and response timing.

Every slave must use a unique station address.

Check in this order

  1. 1Use a daisy-chain RS-485 topology.
  2. 2Set unique slave addresses.
  3. 3Match the serial format on every device.
  4. 4Apply termination according to the equipment manuals.

Last reviewed: 2 October 2026

Official source: Mitsubishi Electric FAQ: maximum Modbus connections

Related verified answers

Which channel numbers are used for FX5U serial communication?Why is my FX5U RS-485 device not communicating?

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