Siemens SINUMERIK 840D sl Function Manual page 1359

2.11.2 NC VAR selector
2.11.2.1 Overview
General
The PC application "NC VAR selector" fetches the addresses of required NC variables and
processes them for access in the PLC program (FB 2/FB 3). This enables the programmer to
select NC variables from the entire range of NC variables, to store this selection of variables,
to edit them by means of a code generator for the STEP7 compiler and finally to store them
as an ASCII file (*.AWL) in the machine CPU program. This process is shown in the figure
"NC VAR selector".
For storing the files created by NC-VAR-selector a catalog is to be implemented via the
Windows Explorer with any catalog name. The selected data of the NC-VAR selector
(data.VAR and data.AWL files) must be stored in this catalog. Therafter, the AWL file is to be
transferred and compiled via the menu option "Code" → "in STEP7 Project" The
"Daten.AWL" (STL data) file must then be inserted into the STEP 7 machine project via
"Insert", "External Source" in the STEP 7 Manager. The source container must be selected
in the manager for this purpose. This action stores this file in the project structure. Once the
file has been transferred, these AWL (STL) files must be compiled with STEP 7.
Note
The latest NC VAR selector can be used for each NC software version (even earlier
versions). The variables can also be selected from the latest list for earlier NC software
versions. The data content in DB 120 (default DB for variables) does not depend on the
software version, i.e., selected variables in an older software version must not be reselected
when the software is upgraded.
Basic logic functions: PLC basic program solution line (P3 sl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
2.11 General conditions and NC-VAR_Selector
Detailed description
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