PLC control system design and debugging steps

As shown in figure 1 as the general steps of designing and debugging of PLC control system. Figure 1 the steps of designing and debugging of PLC control system are ( A) Analysis of the controlled object and put forward the detailed analysis of the controlled process control requirements and characteristics of the work, the understanding between the controlled machine, electricity, liquid, put forward the controlled object to the control requirement of the PLC control system, the control scheme is determined, the design plan descriptions of the proposed. ( 2) Determine the input/output equipment according to the requirements of the system control, determine the system all the required input device ( Such as button, position switch, switch and all kinds of sensors, etc. ) And output devices ( Such as: contactor, solenoid valve, signal lights and other actuators, etc. ) To determine related to PLC controller input/output devices, to determine the PLC I/O points. ( 3) PLCPLC selection including PLC model, capacity, I/O module, power supply, such as the choice of, in the second section of this chapter. ( 4) Distribution design of PLC I/O points and the peripheral hardware circuit 1. Distribution I/O point out the PLC I/O points and corresponding relations between input/output equipment connection diagram or table, this part also can be done in step 2. 2. Design PLC peripheral hardware circuit drawing system to other parts of the electrical circuit diagram, including the main circuit and not enter the control circuit of PLC, etc. By PLC controller I/O connection diagram and PLC periphery electric circuit diagram of system electric schematic diagram. Until the system hardware electric circuit have been confirmed. ( 5) The program design 1. According to the requirements of the system control program design, the use of appropriate design method to design the PLC program. Programs to meet the requirements of system control as the main line, one by one, write the implementation program of the control function or each subtask, gradually improve the function of the system specified. In addition, programs often also should include the following contents: 1) Initialization program. After power on the PLC, is generally going to do some initialization operation, make the necessary preparations for start, avoid system misoperation. Initialization program of the main contents are: to reset some of the data area, counter etc, for some data area data needed for recovery, of certain relay setting or reset, to show some of the initial state, and so on. 2) Detection, fault diagnosis and display program. These programs are relatively independent, generally add when programming basically completed. 3) Protection and chain process. Protection and chain is an integral part of the process, must be carefully taken into consideration. It can be avoided due to illegal operation control logic chaos,. 2. Program simulation debugging simulation debugging is the basic thought of, in the form of a convenient simulation actual state, for the program to run to create the necessary environment conditions. According to the signal in a different way, simulative debugging of hardware simulation and software simulation method in two forms. 1) Hardware simulation method is the use of some hardware devices, If use a PLC or some other input devices, etc. ) The scene of the simulation signal and the signal in the form of hard wiring connected to the input terminal of PLC system, its strong timeliness. 2) Software simulation method is in addition to write a simulation program in the PLC, on-site signal simulation, its simple and feasible, but timeliness is not easy to guarantee. Simulation in the process of debugging, can adopt the method of subsection debugging, and use the monitoring function of the programmer. ( 6) Hardware implementation of the hardware implementation is mainly carries on the control cabinet ( A) Such as hardware design and site construction. Main contents are: 1) Design control cabinet and work station such as part of the electrical layout and installation wiring diagram. 2) Design system of electrical interconnection between the parts. 3) According to construction drawings for field wiring, and check in detail. Due to program design and implementation of hardware can be simultaneously, so the PLC control system can greatly shorten the design cycle. ( 7) On-line debugging on-line debugging is through simulation debugging the program further online tracking. Online debugging process should be gradual, connection again from PLC connected only input devices, output devices, and then connected to the actual load debug step by step. If do not conform to the requirements, adjust the hardware and the procedure. Usually only need to modify the part program. All after the debugging, deliver the commissioning. After a period of time running, if you don't need to modify the work, procedures, procedures should be solidified in the EPROM, in case the program is missing. ( Eight) Organize technical documents and write technical documents including design specification, hardware principle diagram, installation wiring diagram, electrical component list, PLC controller program and the instruction for use, etc.
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