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HIGH-SPEED I/O • FX5U / GX WORKS3

How many built-in high-speed counter channels can an FX5U use?

The FX5 CPU built-in counter supports up to eight channels, but the maximum frequency per channel depends on CPU size and counter configuration.

Practical explanation

Mitsubishi lists 200 kHz on six channels plus 10 kHz on two channels for 32-point FX5U/FX5UC models.

For the listed 64/80-point FX5U and 64/96-point FX5UC models, the FAQ states 200 kHz on eight channels.

Check in this order

  1. 1Confirm the exact CPU point count.
  2. 2Check input type and wiring.
  3. 3Verify the chosen phase/input mode and frequency limit.

Last reviewed: 2 October 2026

Official source: Mitsubishi Electric FAQ: FX5 high-speed counters

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