Analog signals · Define → Analyze → Verify

Analog Scaling Workbench

Scale PLC raw inputs to engineering units, detect underrange and overrange, calculate expected raw counts, and verify 4-20 mA or 0-10 V channel behavior.

Tested calculation logicBeginner + professional viewsComplete free calculator

Workspace density

Both views use the same tested calculation logic.

Define

Signal and range

Use the channel configuration—not a remembered platform default. Live-zero signals reserve the first part of the electrical span for fault detection.

Signal type 4–20 mA supports live-zero commissioning checks.Engineering units For example PSI, °C, GPM, or mm.Raw inputCurrent count read from the PLC channelRaw minimumCount that represents engineering minimumRaw maximumCount that represents engineering maximumEngineering minimumLowest process valueEngineering maximumHighest process valueDisplay decimalsResult precision from 0 through 6

Clamp output to engineering range Keep the displayed value inside the configured engineering span while preserving the unclamped diagnostic value.

Analyze

Calculated result

Engineering valueNormal

80.61 PSI

Signal position80.606% span

0 PSI100 PSI

Expected raw value at target

PSI

Expected PLC raw count9830.5

Practice the scaling assumptions

Try three fictional raw-count exercises covering zero-based ranges, offset ranges, clamping and reverse scaling. The two-page PDF includes an answer key and can be shared with colleagues or students.

Download the free exercise and answer key (PDF)

No account or email required. Practice only; no equipment connection.

Need a five-point calibration record?

Pro Toolkit adds your as-found and as-left readings, tolerance checks, local versions and PDF export. Inspect a fictional completed record before choosing a plan.

Preview the calibration worksheet and sample PDF

Supporting knowledge-base guides

Start with a public worked example, then use the complete Pro procedure for commissioning and troubleshooting.

4-20 mA topic hubPublic scaling diagram, platform comparison, FAQs, and supporting guides.4-20 mA scaling formulaLinear scaling, live-zero handling, and a 12 mA worked example.Allen-Bradley raw countsInterpret module representations without assuming one universal count range.Siemens 0-27648 scalingNormalize Siemens nominal analog values into engineering units.Underrange and overrangeSeparate process values from wiring and instrument fault indications.