Beckhoff First Scan Bit -

: Essential for setting default values for retentive memory variables.

PROGRAM MAIN VAR fbSystemFirstScan : FB_FirstScan; bGlobalFirstScan : BOOL; END_VAR beckhoff first scan bit

Built-in FirstScan flag (recommended if provided) : Essential for setting default values for retentive

Without FirstScan , you face several classic initialization hazards: bGlobalFirstScan : BOOL