Siemens SINUMERIK 828D Programming Manual page 453

Reserved character combinations
The following reservations must be noted when assigning cycle identifiers in order to avoid
name 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".
Further reservations are:
● 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.
Examples:
System variables
$P_IFRAME
$P_F
Note
The "$" character may not be used for user-defined variables.
Fundamentals
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Note
Users should select identifiers, which either begin with "U" (User) or contain underscores,
as these identifiers are not used by the system, compile cycles or SIEMENS cycles.
Meaning
Active settable frame
Programmed path feedrate
Other information
15.5 Identifiers
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