Identifiers
Return to Introduction  Previous page  Next page

 

According to CEI/IEC 1131-3: 1993 - 2.1.2 :

 

An identifier is a string of letters, digits, and underline characters which begin with a letter or undeline character.

Underlines are significant in identifier, for example "LADD_ER" and "LAD_DER" are interpreted as different identifiers. Multiple leading or multiple embedded underlines are not allowed.

Identifiers must not contain the space character.

LadderWORK ARM supports 15 character of uniqueness)

 

Examples

 

No.

Feature description

Examples

1

Upper case and numbers

LW218 LW218T QX567 MYIDENT

2

Upper and lower case, numbers, embedded underlines

The above example plus:

MY_IDENT_15 My_Ident_15 abcd ab_cd

3

Upper and lower case, numbers, leading or embedded underlines

The above example plus:

_LEADING _12345