Provided by standard library.
Function block incrementer:
The input variables CU and RESET as well as the output variable Q are type BOOL, the input variable PV and the output variable CV are type WORD.
The counter variable CV will be initialized with 0 if RESET is TRUE. If CU has a rising edge from FALSE to TRUE, CV will be raised by 1.Q will return TRUE when CV is greater than or equal to the upper limit PV.
Declaration example
CTUInst : CTU ;
Example in Function Block Diagram
Example in Structured Text
CTUInst(CU:= VarBOOL1, RESET:=VarBOOL2 , PV:= VarINT1);
VarBOOL3 := CTUInst.Q ;
VarINT2 := CTUInst.CV;