RECURSIVE_CALL

Severity: warn

A POU invokes itself directly.

Why it matters. IEC 61131-3 implementations have a bounded stack; recursion risks overflow on any input that nests beyond a shallow depth. Convert to iteration where the algorithm allows.

Settings. No check-specific config.

Trigger.

FUNCTION_BLOCK FB_Recur
VAR fbThis : FB_Recur; END_VAR
fbThis();                          (* fires *)
END_FUNCTION_BLOCK

The bot posts.

🟧 warn  RECURSIVE_CALL
Recursive call: FB_Recur calls itself
IEC 61131-3 implementations have a bounded stack; recursion risks
overflow on any input that nests deeper than a few levels.

Fix. Convert to iteration with an explicit stack / queue, or prove the recursion depth is bounded and document the bound.