Beckhoff First Scan Bit Repack -

PROGRAM MAIN VAR bFirstScan : BOOL := TRUE; // Initializes to TRUE on startup END_VAR

: This bit usually only triggers when the TwinCAT Runtime is started or restarted. Simply stopping and starting the PLC code with the "Start/Stop" commands in the IDE may not reset this bit. 2. Custom Initialization Variable beckhoff first scan bit

If you are coming from the Allen-Bradley world, you are likely very comfortable with the (First Scan) bit. It’s a staple for initializing logic, resetting counters, or clearing buffers on startup. PROGRAM MAIN VAR bFirstScan : BOOL := TRUE;