Conveyor belt control ladder diagram

According to the characteristics of the system, a drum controller is used to achieve the above requirements. The designed ladder diagram is shown in the figure.
  The instructions are as follows:
  1) C631 and C633 are used as drum controllers, their counting pulses are generated by T630, and the pulse period is 5s. C633 is used when the sequence is stopped
, and its counting pulses are generated by T643, and the pulse period is also 5s.
    2) After the start signal is valid. T630 generates a pulse every 5 seconds, C631 takes one step, the corresponding pair of normally open contacts are closed, and each device
starts in sequence.
    3) After the stop signal is valid, T633 generates a pulse every 5 seconds , and C633 takes one step. When the corresponding time is reached, the corresponding pair of normally
closed contacts are closed, and each device stops sequentially.
    (4) Conclusion This example takes the automatic control of a sand processing production line as an example. According to the characteristics of the molding sand transportation, old sand transportation and roller system processes,
timers, drum controllers , and shift registers are used for sequence control ladder diagrams. the design of. It can be seen that PLC has powerful functions in sequence control
, rich programming instructions, and flexible and convenient user program design. It is very suitable for the control of automated production lines such as conveyor systems .