Siemens Sinumerik 840D Operating Turning page 312

Section 7
Notes
B523
B523
Work offset
The following variables can be defined:
R parameters ("arithmetic parameters") are channel-specific variables
that you can use within a G code program. G code programs can read
and write R parameters. These values are retained after the control is
switched off.
Global user data ("Global GUD") are valid in all programs and can be
defined as follows:
Keyword DEF
Range of validity NCK
Data type (INT, REAL,....)
Variable names
Value assignment (optional)
Channel-specific user data ("Channel GUD") can be defined with a dif-
ferent value for each channel.
Local user data (LUD) are valid in one program.
Program-global user data ("PUD") are valid in one program and the
called subroutines.
Local user data ("LUD") defined in the main program can become
program-global user data ("PUD") by setting a machine datum.
With that, they are valid in all subprograms, where they can be read and
written.
The PUD mode of action is depending on the machine settings.
Note:
Refer to the machine manufacturer's specifications.
8.1 Selecting the function "User variable"
By pressing the HSK 6 "User variable" the "R vari-
ables" window opens like displayed below.
Page 48 840D/828D SINUMERIK Operate