FB_BA_RFTrig

The function block FB_BA_RFTrig is used to detect a rising or falling edge on a boolean variable.

Syntax

FUNCTION_BLOCK FB_BA_RFTrig
VAR_INPUT
  bValue    :BOOL;
END_VAR
VAR_OUTPUT
  Q         :BOOL;
  Qr        :BOOL;
  Qf        :BOOL;
END_VAR

Name	Type	Description
bValue	BOOL	Value to be monitored.

Name	Type	Description
Q	BOOL	TRUE for one cycle if a rising or falling edge was detected at bValue.
Qr	BOOL	TRUE for one cycle if a rising edge was detected at bValue (monitored value changes from FALSE to TRUE).
Qf	BOOL	TRUE for one cycle if a falling edge was detected at bValue (monitored value changes from TRUE to FALSE).

Development environment	Required PLC library
TwinCAT 3.1 4024.35	Tc3_BA2_Common from V2.1.20.0