In recent years, in order to improve the positioning accuracy of the system to meet the needs of the industry, various control methods and control strategies have been tried, and a lot of work has been done on the pneumatic servo system. When it is necessary to make new assignment tasks or product changes for each unit temporarily, it is easy to change or redesign its new parts. When the position is changed, it can be put into production quickly by reprogramming, thus reducing installation and conversion. The cost of the work. The modular production training system (MPS, ModularProducTIontrainingSystem) is a simulation automation production processing unit developed by the German FESTO company combined with the characteristics of modern industrial enterprises. It can replace a lot of monotonous reciprocating or high-precision work to meet the needs of cutting-edge products and automation equipment updates.
At present, several teaching equipment manufacturers in China have begun to imitate some MPS products from abroad, mainly including “MPS/FMS modular production training system†produced by Shanghai Yingjis Automation Technology Co., Ltd.; Zhejiang Yalong Teaching Instrument Co., Ltd. "Yalong YL-MPS Modular Production Training System". This paper will use the MPS teaching equipment produced by Shanghai Yingjisi Automation Technology Co., Ltd., combined with the actual needs of the laboratory (the national demonstration central financial support key construction laboratory), and give PLC control based on PLC MPS loading detection unit. A complete solution for system design.
Structure, function and pneumatic control circuit of feeding detection unitThe loading detection unit can be used as a starting unit in the MPS system to supply raw materials to other units in the system.
2.1 Structure and function of the feeding detection unit
The feeding detection unit is mainly composed of an I/O wiring port, a tray module, a gas source processing component, a workpiece detecting component, a lifting module and the like. Its specific function is: automatically take out the workpiece to be processed placed in the tray as needed, and detect the black and white color of the workpiece, and finally lift it to the output station, waiting for the next work unit to take.
2.2 Pneumatic control circuit of the feeding detection unit
Figure 1 Feeding detection unit pneumatic control circuit
The actuator of the loading detection unit is a pneumatic control system, and the control mode of the directional control valve is manual control or electromagnetic control. In the pneumatic control schematic diagram of the loading detection unit, 1A is a double-acting lifting cylinder; 1Y1 is a control signal of a double-acting cylinder solenoid valve; 1B1 and 1B2 are magnetic inductive proximity switches. The pneumatic control circuit is shown in Figure 1.
Design Scheme of Control System Based on PLC for MPS Loading Inspection UnitPLC-based MPS loading detection unit control system control task design: After turning on the equipment power and air source, after running the PLC, the reset action is first performed, that is, the workpiece platform driven by the cylinder is lowered into position. The tray rotates to output the workpiece. When the tray detects that there is a workpiece in the workpiece platform, it stops rotating, lifts the cylinder motion, lifts the workpiece platform to the output station, and detects the color of the workpiece and saves it. Press the "Special" button to indicate that the workpiece has been removed. Then the workpiece platform is lowered into position, and the tray continues to rotate to output the workpiece, repeating the above process.
The key aspects of the program are described below.
3.1 Assignment feeding detection unit PLC input and output address
The correspondence between the input and output of the PLC and the actuator is shown in Table 1.
Table 1 Correspondence between PLC input and output and actuator
3.2 Writing a program and debugging
The manual control program block diagram of the loading detection unit is shown in Figure 2.
Figure 2: Manual control block diagram of the loading detection unit
The PLC ladder program of the loading detection unit is shown in Figure 3.
Figure 3 PLC ladder program of the loading detection unit
After debugging, the program can successfully complete the control tasks of this unit.
ConclusionIn this paper, the structure and function of the feeding detection unit and the pneumatic control circuit are analyzed in detail respectively. Then the PLC control system of the feeding detection unit is designed and implemented twice. Firstly, the PLC input and output distribution table is written, and then the The program flow chart and ladder diagram, and finally the machine debugging, verified the feasibility of the secondary design and implementation of the PLC-based MPS loading detection unit control system.
And summed up two conclusions:
(1) When designing the control tasks of each unit, it is necessary to write the actual control tasks according to the basic functions of each unit, and to maximize the rational development of its use functions, but it must conform to its mechanical design, otherwise it will be between the devices. Conflicts occur, causing damage to components;
(2) When designing the ladder program, the reasonable use of the shift instruction and the data transfer instruction, and the clever use of the RS trigger instruction will greatly shorten the ladder programming time and achieve good control effects. Therefore, the PLC control system of the loading detection unit is quickly designed and implemented.
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