public void Update()//Because of the 4 different senarios, the update function has some overloading
{
_PV = Filter.FilterValue((Read.Value - 1) * 50 / 4);
UpdateAlarms();
OPC_PV.Write(_PV);
}
private void trmTick_Tick(object sender, EventArgs e)
{
TT01.Update(Airheater.y);
PI.r = OPC_r.Read();
Airheater.u = PI.Compute(TT01.PV);
OPC_u.Write(PI.U);
}
public double Compute(double PV)//Standard PI controller with anti wind-up
{
r = OPC_R.Read();
e = r - PV;
P = Kp * e;
I = I + e * (Kp * Ts) / Ti;
if (I > MaxU)
{
I = MaxU;
}
else if (I < MinU)
{
I = MinU;
}
if (P + I > MaxU)
{
U = MaxU;
}
else if (P + I < MinU)
{
U = MinU;
}
else
{
U = P + I;
}
OPC_U.Write(U);
return(U);
}
public void Update()//For real processs
{
NI_R.Value = (OPC_R.Read() * 4 / 50 + 1);
OPC_U.Write(NI_U.Value);
}
