Application of V80 series PLC in vacuum packaging machine
I. Overview
Vacuum packaging machine is a kind of mechanical equipment widely used in the packaging industry. Most of the original equipment is relay control, with high failure rate, poor stability and single function. Because the V80 series small PLC produced by Haiweishen Technology (Shenzhen) Co., Ltd. has the characteristics of high reliability, high cost performance and complete analysis by hard logic, in order to improve the cost performance and reliability of the products, vacuum packaging has been developed using V80 series PLC. The machine-specific PLC control system integrates multiple functions into one and achieves good economic benefits.
Second, the process requirements
The vacuum packaging machine has four functional gear positions: sealing, manual vacuum, automatic vacuum and aeration. The four functions are switched by the rotary switch. It is required to immediately terminate the ongoing function when switching. The internal registers and outputs need to be reset before starting a new functional process. The device sets a foot switch that is controlled by the trigger process input.
The process is described as follows:
1. Sealing process:
2. Manual vacuum process:
3. Automatic vacuum process:
4, the inflation process:
Inflation includes 2 options: Inflation 1 and Inflation 2, selected by the gear switch.
The inflation 1 process is: vacuum -> inflation (timer 1 controls inflation time) -> sealing.
The inflation 2 process is: vacuum -> inflation (timer 1 control inflation time) -> vacuum -> inflation (timer 2 control inflation time) -> sealing.
Third, the system configuration
The V80 series PLC produced by Haiweishen Technology Co., Ltd. is a high performance, low price small programmable controller.
It has simple man-machine function, supports digital tube display and keyboard input function, and does not occupy I/O points. It can easily set 3 time values ​​to PLC, replacing the time relay which is easy to damage and cost. The V80 series PLC is the control core of the vacuum packaging machine system. The peripheral devices controlled by it are vacuum pump, air pump, heating wire and position detection switch.
The V80 series PLC is configured as follows:
Fourth, programming
The difficulty in the design of the vacuum packaging machine control program is the realization of the gear shifting pulse and the current process output needs to be reset when the process is switched. The implementation of the gear shifting pulse is completed by a change of the input state to generate a rising delay pulse. The program is as follows:
The key to process switching is to reset the intermediate registers and output variables. The (SET) instruction must execute the (RST) instruction when the switching pulse is generated and the register is reset to zero.
Fives. Conclusion
The vacuum control machine electrical control system is composed of V80 series PLC. Compared with the original PLC, the electrical control system has obvious advantages. It is mainly represented by replacing multiple time relays by simple human-machine, saving PLC IO points and avoiding time. The problem that the relay is easily damaged improves the reliability of the device and produces good economic benefits.
The application in the vacuum packaging machine shows that the V80 series PLC is a small programmable controller with high performance and price. It is more suitable for the electrical control system of small mechanical equipment, mainly reflected in the following points:
1. Low price and good control of equipment costs.
2. With simple man-machine function.
3. Easy programming and easy for electrical engineers to get started.
4. Excellent online programming and monitoring capabilities, very practical for on-site debugging.
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