Definition Of User Variables (Def) - Siemens Sinumerik 840D sl Programming Manual

NCU2
NCU2 uses link variable $A_DLR[ 16 ] to read the actual current value of axis AX2 from the
link variables memory cyclically in the interpolation cycle in a static synchronized action. If the
actual current value is greater than 23.0 A, alarm 61000 is displayed.
Program code
N222 IDS=1 WHEN $A_DLR[16] > 23.0 DO SETAL(61000)
See also
General information about variables General information about variables [Page 17]
1.1.5

Definition of user variables (DEF)

Function
The DEF command is used to define user-specific variables and assign values to them. To set
them apart from system variables, these are called user-defined variables or user variables
(user data).
According to range of validity (in other words, the range in which the variable is visible) there
are the following categories of user variable:
• Local user variables (LUD)
Local user variables (LUD) are variables defined in a part program which is not the main
program at the time of execution. They are created when the part program is called and
deleted at the end of the part program or when the NC is reset. Local user variables can
only be accessed within the part program in which they are defined.
• Program-global user variables (PUD)
Program-global user variables (PUD) are user variables defined in a part program used as
the main program. They are created when the part program starts up and deleted at the
end of the part program or when the NC is reset. It is possible to access PUD in the main
program and in all subprograms of the main program.
• Global user variables (GUD)
Global user variables (GUD) are NC- or channel-global variables which are defined in a
data block (SGUD, MGUD, UGUD, GUD4 to GUD9) and are retained following shutdown
and restart. GUD can be accessed in all part programs.
Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
Flexible NC programming
1.1 Variables
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