INPUT_VAR_WRITTEN

Severity: warn

A VAR_INPUT parameter is assigned inside the POU.

Why it matters. Writing to an input breaks the input/output contract, the caller's value is gone on the next scan because the caller will rewrite it. Almost always a sign of confused intent.

Settings. No check-specific config.

Trigger.

VAR_INPUT
    rTarget : REAL;
END_VAR

rTarget := 100.0;                  (* fires *)

The bot posts.

🟧 warn  INPUT_VAR_WRITTEN
VAR_INPUT rTarget is being assigned inside FB_Pump
Writing to an input variable hides changes from the caller and
breaks the input-output contract. Use a local variable instead.

Fix. Copy into a local variable and modify the local.