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ANALOG • FX5U / GX WORKS3

How do I scale an FX5U 0–10 V input to 0–10 bar?

For a raw range of 0–4000 and an engineering range of 0–10.0 bar, multiply the raw value by 100 and divide by 4000. The result then represents bar × 10.

Practical explanation

Using an integer scaled by ten preserves one decimal place without floating-point instructions.

At raw 2000, the result is 50, which should be displayed as 5.0 bar.

Check in this order

  1. 1Verify that the channel is configured for the expected voltage range.
  2. 2Monitor the raw value at zero and full-scale input.
  3. 3Reserve consecutive work registers used by double-word math.

Ladder instruction example

MOV SD6020 D100
DMUL D100 K100 D104
DDIV D104 K4000 D110

Example only—allocate devices and interlocks for your own project.

Devices and registers

SD6020: verify built-in CH1 assignment for the installed CPU/manual revision
D100: raw copy
D104-D105: double-word multiplication result
D110: pressure × 10

Safety: Do not use a software-scaled value as the only overpressure protection.

Last reviewed: 2 October 2026

Official source: MELSEC iQ-F FX5 User's Manual (Application)

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