Siemens SINUMERIK 840Di Function Manual page 1268

Detailed Description
2.11 General conditions and NC-VAR_Selector
The variable list supplied with the "NC VAR selector" tool is adapted to the current NC
software version. This list does not contain any variables (GUD variables) defined by the
user. These variables are processed by the function block FB 5 in the basic program.
Note
The latest version of the "NC VAR selector" is capable of processing all previous NC
software versions. It is, therefore, not necessary to install different versions of the "NC VAR
selector" in parallel.
System features, supplementary conditions
The PC application "NC VAR selector" requires Windows 95 (or later operating system).
The assignment of names to variables is described in:
References:
/LIS/ Lists; Chapter: Variables,
or in the Variables Help file (integrated in NC VAR selector).
2.11.2.2 Description of functions
Overview
The figure below illustrates how the NC VAR selector is used within the STEP7 environment.
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PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0