Description Of Functions - Siemens SINUMERIK 840D sl Function Manual

System features, supplementary conditions
The PC application "NC VAR selector" requires Windows 2000 or a higher operating system.
The assignment of names to variables is described in:
References:
/List sl (Book1); Chapter: Variables,
or in the variables help file (integrated in NC VAR selector).
13.16.2.2

Description of functions

Overview
The figure below illustrates how the NC VAR selector is used within the STEP 7 environment.
Figure 13-20 Application of NC VAR selector in the STEP 7 environment
The NC VAR selector is used to generate a list of selected variables from a list of variables
and then to generate an .awl file that can be compiled by the STEP 7 compiler.
● A *.awl file contains the names and alias names of the NC variables, as well as information
about their address parameters. Any data block generated from this file will only contain
the address parameters (10 bytes per parameter).
● The generated data blocks must always be stored in the machine-specific file storage
according to STEP 7 specifications.
● To ensure that the parameterization of the GET/PUT (FB2/3) blocks with respect to NC
addresses can be implemented with symbols, the freely assignable, symbolic name of the
generated data block must be included in the STEP 7 symbol table.
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
905