Fundamental Principles of NC Programming
2.2 Language elements of the programming language
Fundamentals
62 Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Note
Number of characters for each identifier
• Program names: 24 characters
• Axis identifiers: 8 characters
• Variable identifiers: 31 characters
Rules for allocating identifiers
The following rules are provided in order to avoid identifier collisions:
• All identifiers beginning with "CYCLE" or "_" are reserved for SIEMENS cycles.
• All identifiers beginning with "CCS" are reserved for SIEMENS compile cycles.
• User compile cycles begin with "CC”.
• We recommend that users select identifier names, which either begin with "U" (User) or
contain the underscore symbol, because these are not used by the system, compile
cycles or SIEMENS cycles.
Further reserved identifiers
• The identifier "RL" is reserved for conventional turning machines.
• All identifiers beginning with "E_ " are reserved for EASY-STEP programming.
Variable identifiers
In variables used by the system, the first letter is replaced by the "$" character. This
character may not be used for user-defined variables.
Examples (see "List of system variables"):
$P_IFRAME, $P_F
Leading zeroes are ignored in variables with numeric extensions (i.e., R01 is interpreted as
R1). Separators are allowed before a numeric extension.
Array identifiers
The rules for elementary variables also apply to array identifiers. It is possible to address
arithmetic variables as arrays.
Example:
R[10]=…
Data types
A variable can contain a numeric value (or several) or a character (or several), e.g., an
address letter.
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