TIME_EQUALITY

Severity: warn. PLCopen: CP28 — equality/inequality comparison on TIME values shall not be used.

A = or <> comparison involves a TIME-typed value (variable or literal: T#5s, TIME#PT1S, LTIME#…). Mechanically similar to REAL_EQUALITY: tick-resolution granularity means two "equal" durations sampled at slightly different cycles can compare unequal. Use a range comparison or a tolerance instead.

Settings. No check-specific config. Affected types: TIME, LTIME, TIME_OF_DAY / TOD, DATE, DATE_AND_TIME / DT. Literals starting with T#, TIME#, or LTIME# are also treated as TIME operands.

Trigger.

VAR
    tElapsed : TIME;
    bDone    : BOOL;
END_VAR
bDone := tElapsed = T#5s;     (* fires *)

The bot posts.

🟧 warn  TIME_EQUALITY
TIME equality compare 'tElapsed = T#5s' (PLCopen CP28)

Fix. Compare against a range, e.g. tElapsed >= T#5s. If you really need "elapsed exactly N", capture the equality via a rising-edge on the inequality flip rather than a literal equality compare.