Programming is the most critical issue in plc applications. The basic idea of ​​PLC programming is to design the logical relationship between input and output signals according to the requirements of the equipment, and obtain the expected output signal when inputting certain signals, so as to achieve the expected working process. Therefore, the simple and commonly used method is to process the starting conditions and limiting conditions of each process, and to program the PLC program of the process according to these conditions, and complete the PLC program of all the processes to complete the entire PLC program.
There are three common methods for PLC programming:
There are many methods of programming, such as state table method, function chart method, flow chart method and modern Petri net method.
1 The state table method is a method that is inherited from the traditional relay logic design method and is appropriately modified to suit the ladder design of the programmable controller. However, the state table method is only suitable for the programming of a single order problem, and there is nothing to do with the problem of parallel order and selection order.
2 Function diagram method is to express the control requirement as a function diagram first, and use the function diagram to describe the control function to be completed by the programmable controller, then write the logic equation from the function diagram, and then draw the ladder diagram or write the instruction.
3 Flowchart method is a programming method commonly used by programmers who are familiar with computer high-level languages.
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