Product : ISaGRAF V3
Date : 5-March-1996
File : Dummyio.Hidden IO var allocated by the ISaGRAF linker.htm
Subject : Hidden I/O variables allocated by the ISaGRAF linker
Keywords: unused variables - Appli.tst - symbol table
ISaGRAF V3.3x systematically includes in the application code (and
also in the symbol table) all the variables declared in the
application, even if not referenced in the programs. This has been
done to ease on-line modification: variables can be reserved for
future extensions in the application.
Undeclared variables are created by ISaGRAF compiler for each
unwired I/O channel.
Having an empty I/O channel consumes one variable, exactly as if a
declared variable was connected.
The variable can be understood as the "%..." available in IEC languages
for the I/O channel.
There is no information, after compiling, which can allow the
filtering of the symbols stored in TST file, whether a variable is
used or not.
This concerns variables really declared by the programmer. All other
variables allocated by the compiler (name beginning with an
underscore) do not appear in the symbol table.
Copyright © 1996-2009 ICS Triplex ISaGRAF Inc. All rights reserved.