Siemens SINUMERIK 840D sl Programming Manual page 36

Fundamental Principles of NC Programming
2.2 Structure and contents of an NC program
Elements of the NC high-level language
As the command set according to DIN 66025 is no longer adequate for the programming of
complex machining sequences in modern machine tools, it has been extended by the
elements of the NC high-level language.
These include, for example:
• Commands of the NC high-level language
In contrast to the commands according to DIN 66025, the commands of the NC high-level
language consist of several address letters, e.g.
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• Identifiers (defined names) for:
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• Relational operators
• Logic operators
• Arithmetic functions
• Control structures
References:
Programming Manual, Job Planning; Section: "Flexible NC programming"
36
OVR for speed override
SPOS for spindle positioning
System variables
User-defined variables
Subroutines
Keywords
Jump markers
Macros
NOTICE
An identifier must be unique and cannot be used for different objects.
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals