PLC control system software design steps

In understanding, on the basis of the program structure and programming method is going to actually write PLC controller program. Write PLC program and write other computer programs, all need through the following process. 1) The purpose of the system task partitioning block is a complex project, broken down into multiple small relatively simple task. So you take a complex problem into several simple small problems. This can be easy to program. 2) Prepare the logic diagram of the control system, from the logic diagram can reflect what is the result of a logical relationship, the results and the export which actions. The logical relationship can be based on the sequential control activities as a benchmark, may also be based on the whole time to the beat. Logic diagram to reflect the control in the process of control functions and activities of the object, and also reflects the relationship between the input and output. 3) The purpose of drawing all kinds of circuit diagram drawing all kinds of circuit is designed by the system input and output address and name. This is a crucial step. In drawing of PLC input circuit, not only should consider whether the connection point of signal is consistent with the naming, consider to whether appropriate at the input voltage and current, also want to consider the reliability and stability of operation conditions in specific situations. Especially want to consider whether to conduct the high pressure to the PLC input end, introduce the high voltage PLC input, can cause big damage to the PLC. In the drawing of PLC output circuit, not only should consider whether the output signal of the connection point is consistent with the name, also considering the PLC output module on load capacity and ability to withstand voltage. Also, consider the power supply output power and polarity. In the circuit drawing, consider the principles of design efforts to improve its stability and reliability. Although with PLC to control the convenient and flexible. But on the design of the circuit is still need to be careful and comprehensive. So in thoughtful when you draw the circuit diagram, where the install button, where the switch, meticulous. 4) PLC program and simulated debugging in after drawing the circuit diagram, can to PLC program. Of course programming can use the above method. In programming, in addition to pay attention to the program to correct and reliable, also consider procedures to simple, time-saving, easy to read, easy to modify. Making a block to simulate experiment, so easy to find the problem, to facilitate change, it is best not to account after completion of the entire program together. 5) Make the console and control cabinet after drawing electrical appliances, after compiling the program, can make the console and control cabinet. In tight time, the job also can undertake and programming. At the time of making the console and control cabinet should pay attention to choose the quality of the devices such as switches, buttons, relays, specifications must meet the requirements. The installation of the equipment must pay attention to safe and reliable. Such as shielding, grounding, the problem such as high voltage isolation must be disposed of properly. 6) Commissioning the scene debugging is an important link in the whole control system is completed. Any program design is hard to say without the scene debugging can be used. Can be found only by the scene debugging control circuit and the control program can not meet the requirement of the system; Can be found only by the scene debugging control circuit and control program happen contradictions; Only the last field on-site commissioning test and adjust control circuit and the control program, to adapt to the requirements of the control system. 7) Write technical documents and field trial operation after the commissioning, control circuit and control program was identified, basic hardware and software of the whole system basic no problem. Would then comprehensive rectification technology documents, including sorting circuit diagram, PLC program, an instruction and the help file. To the basic end of the work.
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