Beckhoff First Scan Bit |best| [ 8K ]

PROGRAM MAIN VAR fbGetCurTaskIndex : GETCURTASKINDEX; // Function block to find current task index END_VAR

In Beckhoff’s TwinCAT 3 environment, there isn’t a single hard-coded bit in the global memory by default, but the system provides a specialized mechanism to create one that is far more powerful than a simple boolean. What is the First Scan Bit? beckhoff first scan bit

Next time you write a new PLC program, ask yourself: “If this were a cold start right now, would my system behave safely?” If the answer isn’t an immediate “yes,” you need FirstScan . PROGRAM MAIN VAR fbGetCurTaskIndex : GETCURTASKINDEX

What the first scan bit is