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Write program to start motor in ladder logic

2.Write code in FBD to control motor

3. Write program in SCL to control motor
This time we have quite a long SCL code generated, code is pasted below
CHATGTP: Here is an example SCL program to control a motor using Siemens S7-300 PLC:
PROGRAM Motor_Control
VAR
MotorSpeed : REAL; (* Motor speed in RPM ) MotorDirection : BOOL; ( Motor direction: 0 for reverse, 1 for forward ) MotorRun : BOOL; ( Motor run command *)
(* Motor control parameters *)
MotorMaxSpeed : REAL := 1000.0; (* Maximum speed in RPM *)
MotorMinSpeed : REAL := 0.0; (* Minimum speed in RPM *)
MotorAcceleration : REAL := 100.0;(* Acceleration rate in RPM/sec *)
MotorDeceleration : REAL := 100.0;(* Deceleration rate in RPM/sec *)
(* Motor feedback signals *)
MotorCurrentSpeed : REAL; (* Motor speed feedback signal *)
MotorRunning : BOOL; (* Motor running feedback signal *)
END_VAR
(* Main program ) BEGIN ( Initialize motor control parameters *)
MotorSpeed := MotorMinSpeed;
MotorDirection := 1;
MotorRun := 0;
(* Set motor feedback signals to initial values *)
MotorCurrentSpeed := 0.0;
MotorRunning := 0;
(* Control loop *)
WHILE TRUE DO
(* Read motor feedback signals *)
MotorCurrentSpeed := MotorCurrentSpeed + MotorAcceleration * T#1S;
MotorRunning := MotorRun AND (MotorSpeed > MotorMinSpeed) AND (MotorSpeed <= MotorMaxSpeed);
(* Check motor direction *)
IF NOT MotorDirection THEN
MotorSpeed := MotorSpeed - MotorDeceleration * T#1S;
ELSE
MotorSpeed := MotorSpeed + MotorAcceleration * T#1S;
END_IF
(* Limit motor speed *)
IF MotorSpeed > MotorMaxSpeed THEN
MotorSpeed := MotorMaxSpeed;
END_IF
IF MotorSpeed < MotorMinSpeed THEN
MotorSpeed := MotorMinSpeed;
END_IF
(* Control motor *)
IF MotorRunning THEN
(* Set motor speed *)
// Depending on the type of motor control used, you might need to convert the MotorSpeed value to the appropriate format, e.g. analog output, frequency, PWM duty cycle, etc.
// Here we assume that MotorSpeed is directly proportional to the motor control signal, e.g. a 4-20 mA signal or a 0-10 V signal.
Motor_Control_Signal := MotorSpeed;
(* Set motor direction *)
// Depending on the motor control scheme, you might need to use different methods to set the motor direction, e.g. a relay, a H-bridge, a VFD, etc.
// Here we assume that the MotorDirection signal directly controls the motor direction, e.g. a relay or a solid-state switch.
Motor_Direction_Signal := MotorDirection;
ELSE
(* Stop motor *)
Motor_Control_Signal := 0.0;
Motor_Direction_Signal := 0;
END_IF
(* Wait for one cycle *)
TON1(IN:=TRUE, PT:=T#1S);
END_WHILE
END_PROGRAM
It cannot be copied in TIA Portal and run because SCL declaration of variables is different. There are some fundamental mistakes and basically this code will put PLC in stop because of infinite While DO Loop 🙂 See Video… https://www.youtube.com/watch?v=lk_ciWIgy08
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