Beckhoff First Scan Bit

Object Interface method - Beckhoff Information System - English

For further reading, consult the Beckhoff Infosys entry on "TwinCAT PLC Initialization" or search your TwinCAT help index for bInit (TwinCAT 2 compatibility). beckhoff first scan bit

If a variable is RETAIN and you reinitialize it on first scan, you lose the retained value. : Only initialize non-retain variables or use conditional checks. Object Interface method - Beckhoff Information System -

// In your MAIN POU logic: IF bFirstScanManual THEN // Perform initialization // ... beckhoff first scan bit