FieldengInstrumentation & Controls
4–20 mA PLC Raw Scaling
Raw PLC counts that represent 4–20 mA, then the configured engineering pressure.
Instrumentation & ControlsElectrical & Power
Raw PLC counts that represent 4–20 mA, then the configured engineering pressure.
App id: INST-18. Reference version 1.0.
How to fill it
Fill the inputs. The tool shows the outputs.
On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.
Formula
raw → % → mA → EUInputs
| Name | Unit |
|---|---|
| Raw count | 1 |
| EU lower | psi |
| EU upper | psi |
| Raw minimum (4 mA) (optional) | 1 |
| Raw maximum (20 mA) (optional) | 1 |
Outputs
| Name | Unit |
|---|---|
| Engineering value (hero result) | psi |
| Implied current | mA |
| Raw span | % |
Diagnose
Observations are context. They do not pass or fail a structure. See Diagnose.
| When | Observation | Severity |
|---|---|---|
span fraction < 0 or span fraction > 1 | Outside configured span | caution |
Assumptions
- Default raw 0–32767 maps to 4–20 mA and then to the entered pressure range.
Provenance
- Common PLC card mapping: raw min = 4 mA, raw max = 20 mA.