Siemens S7-300 Ladder Diagram PLC Programming Example-Control Belt

This PLC programming example is plc control belt

(1) Control requirements

Electric start belt,At the beginning of the belt has two push button switches: S1 for START and S2 for STOP;At the end of the belt also has two buttons switches: the S3 for START and STOP for the S4. You can start or stop the belt from either end. In addition, when an object on the belt reaches the end, the sensor S5 make  belt stop.

(2)Programming element symbolic address

Symbol Address
Absolute address
class type
    Explanation
    S1
    I0.0
    BOOL
Start button
    S2
    I0.1
    BOOL
Stop start button
    S3
    I0.2
    BOOL
Tail start button
    S4
    I0.3
    BOOL
Tail stop button
    S5
    I0.4
    BOOL
 sensor
 MOTOR_ON
    Q0.0
    BOOL
 motor

(3)Ladder diagram


PLC programming ladder diagram

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