Nc Var Selector; Overview - Siemens SINUMERIK 840D sl Function Manual

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13.16.2

NC VAR selector

13.16.2.1

Overview

General
The PC application "NC VAR selector" retrieves the addresses of required NC variables and
processes them for access in the PLC program (FB2/FB3). 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 STEP 7 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. Thereafter, the STL file is to be
transferred and compiled via the menu option "Code" → "in STEP 7 Project". The "data.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).
For older NC software versions the variables can also be selected from the latest complete
list. The data content in DB120 (default DB for variables) does not depend on the software
status. That is, variables selected in an older software version need not be reselected when
the software is upgraded.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
P3: Basic PLC program for SINUMERIK 840D sl
13.16 Basic conditions and NC VAR selector
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