POINTER_COMPARED

Severity: warn. PLCopen: E3 — some comparator instructions shall not be used for pointers.

A relational comparison <, >, <=, or >= is applied to a POINTER-typed operand. PLCopen forbids relational pointer comparisons because the runtime's address ordering is not standardised — the same code can return different results on different vendor runtimes. Equality (= / <>) comparisons of pointers are still allowed.

Settings. No check-specific config. Operands are tracked as POINTER-typed via the symbol table.

Trigger.

VAR pA, pB : POINTER TO INT; END_VAR
IF pA < pB THEN ...                    (* fires *)

The bot posts.

🟧 warn  POINTER_COMPARED
Relational comparison of pointer 'pA < pB' (PLCopen E3)

Fix. Use = / <> if you need to check pointer identity, or compare the values they point at (pA^ vs pB^).