Beckhoff First Scan Bit -

Understanding the Beckhoff First Scan Bit: A Comprehensive Guide

3. Manual rising-edge detection (old method)

VAR
    bFirstScan : BOOL := TRUE;
END_VAR
// Implementation
fbFirstScan(CLK := bInit);
bFirstScan := fbFirstScan.Q;
bInit := FALSE;
 beckhoff first scan bit

Why is the First Scan Bit important?