UNUSED_RETURN_VALUE

Severity: info

A function (POU with a return type) is invoked as a bare statement, discarding the result.

Why it matters. Either the call was for side effects (which functions in IEC ST shouldn't really have) or the return value should be used. Both warrant a closer look.

Settings. No check-specific config.

Trigger.

FUNCTION Compute : INT
    Compute := 42;
END_FUNCTION

Compute();                         (* fires, return value discarded *)

The bot posts.

🟦 info  UNUSED_RETURN_VALUE
Return value of Compute() (declared INT) is discarded
Calling a function as a bare statement throws away its result.
Assign it to a variable or use the value in an expression.

Fix. Assign the result (iResult := Compute();), or use it in an expression.