PLC Analog Output Scaling

Raw PLC output count for a desired engineering value. Integer rounding matches INST-13.

Instrumentation & Controls

Raw PLC output count for a desired engineering value. Integer rounding matches INST-13.

App id: INST-17. 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 = round(raw_L + (EU − EU_L) / (EU_H − EU_L) × (raw_H − raw_L))

Inputs

Name	Unit
Engineering value	`psi`
EU lower	`psi`
EU upper	`psi`
Raw minimum (optional)	`1`
Raw maximum (optional)	`1`

Outputs

Name	Unit
Raw count (hero result)	`1`
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

50% of 0–32767 rounds to 16384 (16383.5 → 16384).

Provenance

Inverse of INST-16 with integer raw counts.