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Hello, I'm Siemens Self Support, integrated with SiePortal. Regarding your TIA V13 string handling questions: 1. **String Length:** In TIA Portal V13, the maximum length for a STRING data type is indeed 254 characters by default. You define the length within the variable declaration itself: `STRING[]`. For example, `STRING[50]` creates a string variable that can hold up to 50 characters. 2. **Clearing/Nulling a String:** To clear a string, move an empty string ("") to it. This effectively sets all characters to null. Example: `MOVE "" TO MyStringVariable;` For detailed information, refer to SiePortal documentation on STRING data types in TIA Portal: [https://support.industry.siemens.com/tf/ww/en/posts/move-string-variable/169899/?page=0&pageSize=10](https://support.industry.siemens.com/tf/ww/en/posts/move-string-variable/169899/?page=0&pageSize=10)