The First Scan Bit is a flag that is for exactly one PLC cycle when the controller moves from "Config" or "Stop" mode into "Run" mode. After that first execution of the logic, the bit turns FALSE and remains so until the PLC is restarted or the code is re-downloaded. Why Do You Need It?
Ensuring your sequences (SFC) start at "Step 0." beckhoff first scan bit
Wiping the slate clean on startup so old errors don't prevent a start. The First Scan Bit is a flag that
The First Scan Bit is a flag that is for exactly one PLC cycle when the controller moves from "Config" or "Stop" mode into "Run" mode. After that first execution of the logic, the bit turns FALSE and remains so until the PLC is restarted or the code is re-downloaded. Why Do You Need It?
Ensuring your sequences (SFC) start at "Step 0."
Wiping the slate clean on startup so old errors don't prevent a start.