Why can Siemens S7-200PLC programming software modify the symbol table without modifying the program - Database & Sql Blog Articles

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I'm currently working on updating the program because many DI/DO points have been relocated. It's quite easy to make mistakes when changing the symbol table and the program itself. Is there a feature similar to the S7-200 programming software that allows me to modify only the symbol table without having to rewrite the entire program? This would save time and reduce errors.

Figure 1: Modify Addressing Priority

Figure 2: Confirmation Display

Figure 3: Symbol Table Modification

As mentioned earlier, using symbolic addressing is a reliable method to adjust the actual IO addresses without directly modifying the program logic. This approach not only makes the process more efficient but also improves clarity and maintainability. If you're working with a large system, it's highly recommended to use this technique to avoid confusion and ensure accuracy. You can set up your symbols once and then update them as needed, which greatly simplifies future changes.