WARNING

UNEXPECTED OUTPUT BEHAVIOUR Make sure that the function block is always invoked in the first program cycle. Failure to follow these instructions can result in death, serious injury, or equipment damage.

Variable	Description
	Value of input X from the previous cycle
	Value of the output Y from the previous cycle
dt	is the time differential between the current cycle and the previous cycle

CAL INTEGRATOR1_Instance (MAN:=ManualMode, HALT:=HaltMode, 
    X:=InputVariable, GAIN:=IntegralGain, 
    YMAX:=UpperControlLimit, YMIN:=LowerControlLimit, 
    YMAN:=ManualControlLimit, Y=>Output, 
    QMAX=>Y_AtUpperLimit, QMIN=>Y_AtLowerLimit)

INTEGRATOR1_Instance (MAN:=ManualMode, HALT:=HaltMode, 
    X:=InputVariable, GAIN:=IntegralGain, 
    YMAX:=UpperControlLimit, YMIN:=LowerControlLimit, 
    YMAN:=ManualControlLimit, Y=>Output, 
    QMAX=>Y_AtUpperLimit, QMIN=>Y_AtLowerLimit) ;