AUTOMATION / CALCULATOR

4–20 mA / PLC Scaling

Scale engineering values bidirectionally with 4–20 mA, 0–10 V or PLC raw counts.

Input Parameters

Edit the example values. Results update as you type.

Signal Type

Conversion Direction

Engineering Range Minimum

Engineering Range Maximum

Engineering Unit (optional)

Signal Value

y = yₘᵢₙ + (x − xₘᵢₙ) / (xₘₐₓ − xₘᵢₙ) × (yₘₐₓ − yₘᵢₙ)

0 + (12 − 4) / (20 − 4) × (100 − 0) = 50 °C

Normalize the input to 50% of full scale.
Map the normalized ratio to the target range. Reverse PLC scaling rounds to the nearest integer count.

Supports linear scaling within the nominal range. PLC raw-value limits depend on the module and configuration.

y = yₘᵢₙ + (x − xₘᵢₙ) / (xₘₐₓ − xₘᵢₙ) × (yₘₐₓ − yₘᵢₙ)

When does the PLC range 0–27648 apply?

This is the unipolar nominal encoding of some SIMATIC modules. Check the module and configuration for ranges, fault codes and overrange behavior.