Identifiers - Siemens SINUMERIK 828D Programming Manual

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15.5 Identifiers

15.5 Identifiers
The commands according to DIN 66025 are supplemented with so-called identifiers by the
NC high-level language.
Identifiers can stand for:
● System variables
● User-defined variables
● Subroutines
● Keywords
● Jump markers
● Macros
Note
Identifiers must be unique. It is not permissible to use the same identifier for different
objects.
Rules for names
The following rules apply when assigning identifier names:
● Maximum number of characters:
● Permissible characters are:
● The first two characters must be letters or underscores.
● Separators are not permitted between the individual characters.
Note
Reserved keywords must not be used as identifiers.
452
– For program names: 24
– Axis identifiers: 8
– Variable identifiers: 31
– Letters
– Numbers
– Underscores
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals