VARIABLE_SHADOWING

Severity: warn

A local variable has the same name as a VAR_GLOBAL. The local hides the global inside this POU.

Why it matters. "Why isn't the global updating?" turns into a 30-minute debugging session. The local wins inside the POU; readers two months later can't tell which one is meant.

Settings. No check-specific config.

Trigger.

VAR_GLOBAL
    gFlow : REAL;
END_VAR

FUNCTION_BLOCK FB_Pump
VAR
    gFlow : REAL;                  (* fires, shadows global *)
END_VAR

The bot posts.

🟧 warn  VARIABLE_SHADOWING
gFlow (var_local) shadows a global of the same name

Fix. Rename the local, or remove it if the intent was to use the global.