Product : ISaGRAF V3
Date : 29-January-1999
File : OnLine.Constants with on-line modification.htm
Subject : Constants with on-line modification
Keywords: on-line change - on-line modification - constant
If you want to change a constant in your project and benefit from
the on-line modification possibility, here are some solutions:
1 Verify first that the constant value you wish to change is not
If so Change a constant variable to only a value that is already used
in the project.
2 You may declare variables with constant type into the dictionary.
Then use them as modifyable values.
3. Build a dummy program that assign about 10 constant values into 10
dummy variables. (or more)
Note : put cst values that you are sure you will never use in the
Each time you wish to make an on-line modification,
if the CRC changes
- modify one of the 10 constant values into your desired value
- Generate code, CRC should be the same and
on-line modification works
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