In order to adapt to the use in industrial environments, programmable control plays an important role in the field of freeze drying machine for home:
　　1. High reliability and strong anti-interference ability. The average time between failures is up to 300,000 hours;
　　2. The control program is variable and has good flexibility. When the freeze drying machine for home is used to dry different types of food or production equipment, it is not necessary to change the hardware equipment. It is only necessary to change the freeze-drying procedure or freeze-drying curve to meet the process requirements;
　　3. Simple programming and easy to use. This is another feature of PCs over microcomputers. At present, most PCs adopt the "ladder programming mode" in the form of relay control, which inherits the clear and intuitive of traditional control lines, and considers the reading loss and microcomputer level of most on-site enterprise electrical technicians, which is easy for school operators to accept. ;
　　4. Complete function. Modern PCs have digital and analog input, output logic and arithmetic operations, counting, sequencing control, power drive, communication, man-machine dialogue, self-defense, recording and display, so that the control level of home freeze dryers is greatly improved. Easy to expand and flexible in combination. The PC has various expansion units, which can be easily adapted to the needs of different freeze-drying process control. The system of different input and output points and input and output modes reduces the workload of control system design and construction. Because the PC uses software programming to achieve the control function, instead of the hard wiring used in the relay control to achieve the control function, the design and construction workload is reduced, and the PC simulates debugging in advance to reduce the on-site workload;
　　5. Small size and light weight. Designed for industrial use, the PC is compact, rugged, compact, and highly resistant to interference. Once inside the machine, the PC can be networked with the monitoring computer.

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