INFINITE_LOOP¶

Severity: error

WHILE TRUE (or WHILE 1) with no EXIT inside the body.

Why it matters. On a PLC scan, an infinite loop blocks the rest of the program forever, eventually tripping the watchdog. Easy to write by accident, catastrophic in production.

Settings. No check-specific config.

Trigger.

WHILE TRUE DO
    iCounter := iCounter + 1;      (* fires, no EXIT *)
END_WHILE;

The bot posts.

🟥 error  INFINITE_LOOP
WHILE TRUE loop with no EXIT statement
On a PLC scan, an infinite loop blocks the rest of the program
forever. Either add EXIT inside the body or convert to a
state-driven structure.

Fix. Add an EXIT condition, or convert to a state machine that runs one iteration per scan.