Beckhoff First Scan Bit [better] Jun 2026

Note: exact symbol names can vary by TwinCAT version and project conventions.

In TwinCAT 2, it is typically FirstCycle or FirstScan . In TwinCAT 3, it is available via Tc2_System function block or directly as FirstScan in some contexts. beckhoff first scan bit

: In large OOP-based TwinCAT projects with many reusable function blocks. Note: exact symbol names can vary by TwinCAT

a global or local variable: bInitialized : BOOL := FALSE; Logic : beckhoff first scan bit