→IEC-identifier
an identifier according to →IEC-standard: combination of letters, numbers, and underscore characters which begins with a letter or underscore and which names a language element; The case of letters shall not be significant in identifiers, for example, the identifiers abcd
, ABCD
, and aBCd
shall be interpreted identically. The underscore character shall be significant in identifiers, for example, A_BCD
and AB_CD
shall be interpreted as different identifiers. Multiple leading or multiple embedded underlines are not allowed; for example, the character sequences __LIM_SW5
and LIM__SW5
are not valid identifiers. Trailing underscores are not allowed; for example, the character sequence LIM_SW5_
is not a valid identifier.
Identifiers in the ST-code, FBD-logic or the ladder diagram must not be →keywords according to the IEC-standard, see "Reserved keywords".
Identifiers in the library configuration must not be →keywords for the library configuration, see "Reserved keywords in the library configuration"
Identifiers in the ST-code, FBD-logic or ladder diagram must not contain special characters, such as umlauts (ä
, ö
, ü
) or ß
.