Beckhoff First Scan Bit Today

: Triggering handshake or connection logic that only needs to happen once upon startup. Safety Resets

fbFirstScan(); IF fbFirstScan.bFirstScan THEN // One-time initialization code here bInitDone := TRUE; END_IF beckhoff first scan bit

FirstScan gives you a deterministic moment to reset, preset, or home everything before normal operation begins. : Triggering handshake or connection logic that only

Unlike some traditional PLCs (like Allen-Bradley’s S:FS bit) that have a predefined system variable, Beckhoff’s TwinCAT allows for several ways to achieve this functionality depending on your version and preference. Methods to Implement First Scan in TwinCAT 1. Using the TwinCAT System Info (The Pro Way) beckhoff first scan bit

Initialization block with handshake: