In Beckhoff TwinCAT, the First Scan Bit is accessed via the _TaskInfo system array using the FirstCycle property. This bit is uniquely TRUE during the first execution cycle of a task, allowing for precise system initialization. First Scan Bit - OpenPLC Forum
Which of these two methods are you planning to use for your specific project? Beckhoff CX1010 first scan | PLCtalk - Interactive Q & A beckhoff first scan bit
Setting default temperatures, speeds, or timers. In Beckhoff TwinCAT, the First Scan Bit is
Clear old error flags that might have occurred during the previous shutdown. Establish Communication: In Beckhoff TwinCAT
// EXIT section runs when program stops EXIT myOutput := FALSE;
Version and platform considerations