Siemens SINUMERIK 840DE SL - Page 1269

Detailed Description
2.11 General conditions and NC-VAR_Selector
PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2-75
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Fig. 2-21 Application of NC VAR selector in the STEP7 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 STEP7 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 STEP7 specifications.
• To ensure that the parameterization of the GET/PUT (FB 2/3) 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 STEP7 symbol table.