Identifiers - Siemens SINUMERIK 840D sl 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.
436
For program names: 24
Axis identifiers: 8
Variable identifiers: 31
Letters
Numbers
Underscores
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals