Partial ladder diagram of hot air circulation automatic control

The PLC control ladder diagram design of the grain dryer is based on the workflow of the grain dryer. The system mainly includes grain moisture detection and
burner control. Moisture detection should be carried out at certain intervals. The detected grain moisture is compared with the given value. If the detected
moisture is not greater than the dry grain moisture given value, the burner is controlled to turn off. Otherwise, the burner is controlled to ignite and burn. , the corresponding control ladder diagram is
shown in Figure 26-13.
    (4) Conclusion The development of mechatronics technology provides the possibility for agricultural machinery to realize automation, and also provides a
broad application area for PLC. Compared with traditional electrical control, single-chip microcomputer control and other solutions , the PLC automatic control system for grain dryers given in this example
has the advantages of stable and reliable operation, simple equipment structure, and easy maintenance. It is fully suitable for various grain dryers. automatic
control.