Programmable controller PLC application system design and debugging of the main steps

Application of programmable controller system design and debugging of the main steps, as shown in figure 1. ( 1) In-depth understanding and analysis of the controlled process conditions and control requirements 1) Controlled object is controlled mechanical and electrical equipment, production lines, or production process. 2) Control requirements mainly refers to the control of the basic mode, shall complete the action, the composition of the automatic work cycle, the necessary protection and interlock, etc. For more complex control system, and control tasks can be divided into several independent parts, this can change numerous for brief, is advantageous to the programming and debugging. Figure 1 control system general design steps ( 2) Determine the I/O device according to the controlled object of the function of the PLC controller control system, determine the user input and output equipment required by the system. Commonly used input devices have button, selector switch, trip switch, sensor, etc. , commonly used output device has relay, contactor, light, electromagnetic valve, etc. ( 3) Choosing the appropriate type of PLC based on the identified user I/O devices, statistics required input signal and output signal points, choosing the appropriate type of PLC, including the selection of models, the choice of capacity, I/O module choice, the choice of power supply module, etc. ( 4) Distribution I/O points of PLC input and output points, develop the distribution of the input/output table or draw a diagram of the input/output terminals. Then nine can undertake PLC program design, at the same time can carry on the design of the control cabinet or work station and site construction. ( 5) Design application system state of ladder diagram program according to the work function chart or flow chart and design of ladder diagram programming. This step is the core work of the whole application system design, is also a difficult step, to design good ladder diagram, first of all, be very familiar with the control requirements, but also has the certain electrical design experience. ( 6) The program when using simple input PLC programmer will be input to the PLC program, need to convert ladder diagram into instruction mnemonic, in order to enter. When using the programmable controller of auxiliary programming software in computer programming, through up and down a machine connection cable to download to the PLC program. ( 7) Input after the PLC software test procedure, test work should be. Because in the process of program design, will have its gaps. So before connect the PLC to the field devices, necessary for software testing, to eliminate errors in the program, but also provided a basis for the overall debugging, shorten the cycle of the overall debugging. ( 8) Application system software and hardware design and debugging in the PLC control cabinet and site construction is completed, you can proceed to the on-line debugging of the whole system, if the control system is composed of several parts, you should first make local debugging, and then to the overall debugging; If the step sequence control program is more, can to block debugging, and then connect tuned. Problems found during the debugging, to rule out one by one, until debugging success. ( 9) Compile technical file system technical documentation including specification, schedule of arrangement plan of the electrical schematic diagram, electrical appliances, electrical components, PLC controller ladder diagram.
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