I have a ST program that on interval executes just fine, but if I right click on it and select execute then it prompts me for the ParentFolderInput. It was written in version 2010 R1.1   I was annoyed by it and thought it should not do that, but at the time I was trying to get the project finished and since it worked on a Interval as I needed it I just moved on and never inquired why it does this.   If you use a method button to execute it, you can set it to a null '' (single quote, single quote) for its initial value.   Here is what  I did for reference. PROGRAM MyTextProgram METHOD Exec AT %M(.Trigger ST_EA.Execute):STRING; END_METHOD VAR ParentFolder AT %M(..FullName) : STRING; END_VAR VAR_INPUT ParentFolderInput : STRING; END_VAR ParentFolderInput := CONCAT(ParentFolder, '.BI.%'); Exec(ParentFolderInput); END_PROGRAM ... View more

Option Explicit is not required it is extremely useful when writing or editing the code. It generates an error if you forgot to declared variables that you use in your routine, or you misspelled a variable.   If you are using a code fragment in a pick action you don't need Sub lines, but you do in the mimic scripting.   Your question about weather the sub line were necessary made me think a moment. I don't use the code fragment option much and I tend to forget about it. My scripts are almost always more complicated than I want to try to put in a code fragment. Most of mine check if the user has control privileges and if they do not it prompts them that they don't have the right to operate the button and need to use a different login. Most of mine also ask to confirm they meant to press the button to prevent accidental operations.   Also you can run debugging on the code in the Mimic script section.     ... View more