Learn S7-SCL-ADVANCED with Real Code Examples

FUNCTION_BLOCK FB_PID
VAR_INPUT
    SP : REAL;
    PV : REAL;
END_VAR
VAR_OUTPUT
    CV : REAL;
END_VAR
VAR
    e_prev : REAL := 0;
    i_sum : REAL := 0;
    Kp : REAL := 1.0;
    Ki : REAL := 0.1;
    Kd : REAL := 0.01;
END_VAR

CV := Kp*(SP-PV) + Ki*i_sum + Kd*(PV - e_prev);
i_sum := i_sum + (SP-PV);
e_prev := PV;

A basic PID controller implemented in S7-SCL.

FUNCTION FB_ArraySum
VAR_INPUT
    values : ARRAY[1..10] OF INT;
END_VAR
VAR_OUTPUT
    sum : INT;
END_VAR
VAR
    i : INT;
END_VAR
sum := 0;
FOR i := 1 TO 10 DO
    sum := sum + values[i];
END_FOR;

Sum elements of an array using S7-SCL.

FUNCTION FB_MotorControl
VAR_INPUT
    sensor : BOOL;
END_VAR
VAR_OUTPUT
    motor : BOOL;
END_VAR
IF sensor THEN
    motor := TRUE;
ELSE
    motor := FALSE;
END_IF;

Turn a motor on or off based on sensor input using S7-SCL.