VoltCheck24 Engineering Calculator

PLC Analog Scaling Calculator for 4-20mA and ADC Inputs

Generate engineering-unit scaling formulas for 4-20mA, 0-10V, and common PLC ADC raw ranges used in industrial automation.

Open Interactive Calculator Open 4-20mA Loop Calculator

How to use this calculator

Collect the values below from the equipment nameplate, data sheet, or field measurement.
Enter values using one consistent unit system and use worst-case operating conditions.
Review the result, margin, and engineering note before selecting hardware.
Cross-check the result with the related calculator and save the review for your project record.

Input checklist

Signal type and range
PLC raw minimum and maximum
Engineering-unit minimum and maximum
Vendor card data sheet

Example field question

Use this calculator when a design review or site issue requires a quick engineering check before a detailed manufacturer selection.

Common mistakes to avoid

Do not mix nominal values with measured worst-case values. Keep units consistent and include cable, temperature, duty, and derating assumptions where applicable.

Standards and validation

Review the result against local codes, IEC/NEC/NFPA/ISO practices when applicable, project specifications, and the latest manufacturer data sheet.

Recommended workflow

Start with the primary calculation, then use the related tool to check the next design dependency. Save or print the result only after the assumptions and worst-case conditions are confirmed.

Start with the primary inputs Check the related dependency

Formula and Inputs

EU = EUmin + (Raw - Rawmin) x (EUmax - EUmin) / (Rawmax - Rawmin).

Industrial Use Cases

Use this page when commissioning Siemens, Rockwell, Mitsubishi, Omron, or custom PLC analog input ranges.

Engineering Note

Confirm the card’s actual raw count range, under-range and over-range behavior, signal type, and engineering-unit limits before downloading code.

FAQ

Which raw range should I use?

Use the exact range documented for the installed analog input module, not a generic 12-bit or 16-bit assumption.

Can I generate PLC code from the result?

The interactive calculator provides a scaling equation and vendor-oriented code guidance for commissioning.

Preliminary engineering reference only. Confirm final selections against current standards, project specifications, and manufacturer data.