Flexible Nc Programming; System Variables - Siemens SINUMERIK 840D sl Programming Manual

Flexible NC programming

1.1 Variables
See also
System variables (Page 16)
Predefined user variables: Arithmetic parameters (R) (Page 19)
Predefined user variables: Link variables (Page 21)
1.1.2

System variables

System variables are variables which are predefined in the system and provide access to the
current parameter settings associated with the control, as well as machine, control, and
process statuses, in part programs and cycles.
Preprocessing variables
Preprocessing variables are system variables which are read and written in the context of
preprocessing; in other words at the point in time at which the part program block in which
the system variable is programmed is interpreted. Preprocessing variables do not trigger
preprocessing stops.
16
User variables are subdivided into:
– Predefined user variables
Predefined user variables are variables which have already been defined in the
system and whose number simply has to be parameterized by the user via specific
machine data. The user can make significant changes to the properties of these
variables. See "Redefinition of system variables, user variables, and NC language
commands (REDEF) (Page 31)".
– User-defined variables
User-defined variables are variables which are defined exclusively by the user and are
not created by the system until runtime. Their number, data type, visibility, and all
other properties are defined exclusively by the user.
See "Definition of user variables (DEF) (Page 24)".
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
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