First Scan Bit — Beckhoff

: This bit usually only triggers when the TwinCAT Runtime is started or restarted. Simply stopping and starting the PLC code with the "Start/Stop" commands in the IDE may not reset this bit. 2. Custom Initialization Variable

// This runs once when the FB is created (first scan of the FB) METHOD FB_Init : BOOL VAR_INPUT bInitRetains : BOOL; // TRUE if retain variables are restored bInCopyCode : BOOL; // TRUE if FB is copied END_VAR fSpeed := 0.0; // Initialize internal variable bReady := FALSE; END_METHOD beckhoff first scan bit

Have a tricky Beckhoff initialization issue? Share your experience in the comments or contact your local Beckhoff automation partner. : This bit usually only triggers when the

property, the code can detect if it is running for the first time. For example, in Structured Text (ST): Custom Initialization Variable // This runs once when