TIA Portal SCADA ทองแดง

// =========================================================================
// Block: Main [OB1]
// Description: Main execution cycle for Copper Production Line
// =========================================================================

IF "HMI_Start_Btn" AND NOT "HMI_EStop" THEN
    "System_State" := 1; // RUNNING
ELSIF "HMI_Stop_Btn" OR "HMI_EStop" THEN
    "System_State" := 0; // STOPPED
END_IF;

// --- Call Sequencer (Grafcet FB) ---
CALL "Sequence_Cuivre_FB", "Seq_DB" (
    Execute := "System_State",
    Reset   := "HMI_EStop",
    Step    => "Current_Step_HMI"
);

// --- PID Control (Furnace Heating & Pressure) ---
IF "Current_Step_HMI" = 4 THEN
    "PID_Temp_DB"(
        Setpoint := 1200.0,
        Feedback := "Sensor_Temp_AI",
        Output   => "Furnace_Power_AO"
    );
    // Valve control based on Pressure
    IF "Sensor_Press_AI" > 3.0 THEN
        "Valve_Pressure_Relief" := TRUE;
    ELSE
        "Valve_Pressure_Relief" := FALSE;
    END_IF;
ELSE
    "Furnace_Power_AO" := 0.0;
    "Valve_Pressure_Relief" := FALSE;
END_IF;

// --- Scale Analog Inputs for HMI Display ---
"HMI_Display_Temp" := SCALE(IN:="Sensor_Temp_AI", HI_LIM:=1500.0, LO_LIM:=0.0);
"HMI_Display_Press" := SCALE(IN:="Sensor_Press_AI", HI_LIM:=5.0, LO_LIM:=0.0);
"HMI_Display_Current" := SCALE(IN:="Sensor_Current_AI", HI_LIM:=30000.0, LO_LIM:=0.0);
"HMI_Display_Voltage" := SCALE(IN:="Sensor_Voltage_AI", HI_LIM:=500.0, LO_LIM:=0.0);
"HMI_Display_pH" := SCALE(IN:="Sensor_pH_AI", HI_LIM:=14.0, LO_LIM:=0.0);

// --- Alarms Generation ---
IF "Sensor_Temp_AI" > 1250.0 THEN "Alarm_High_Temp" := TRUE; END_IF;
IF "Sensor_Press_AI" > 4.0 THEN "Alarm_High_Press" := TRUE; END_IF;