In order to shorten the early problem period, further extend the random problem period, and delay the arrival of the wear and tear problem period, we will generally choose the method to take a certain approach at the beginning of the system planning, and replace the components that enter the wear and tear problem problem before the arrival of the wear and tear problem period. Of course, in order to better find the location of the problem and do the above work well, it is important to have a considerable understanding of the parts where the problem is scattered. The spread of the questions is generally as follows:
(1) External faults
The external problems of the control system refer in detail to the various switches, actuators, sensors and loads and other equipment that are directly connected in the actual working process. When this part of the equipment has problems, it will generally directly affect the relevant control functions of the system, and the cause of the problem is generally the quality problem of the equipment itself or the reason for the life of the device.
(2) System failure
The problem of the system is the overall problem of the operation of the system. System problems are divided into fixed problems and contingent problems. Accidental problems refer to the fact that after the problem occurs, it can be restarted to restore the system to normal; Qualitative problems refer to the fact that after the problem is generated, the reboot cannot be repaired and the hardware or software needs to be replaced before the system can be restored normally. Fixity problems are generally caused by improper system planning or the long number of years of operation of the system.
(3) Hardware failure
In the control system, the hardware problem mainly refers to the problem caused by the damage of the template of the system, which is generally significant, and the impact is also local, and the reason for this problem is that the equipment is used for a long time in the process of use, and the elements of the template are aged.
(4) Software failures
Software problems are caused by the faults of the software itself, mainly due to poor planning of the software, which can be caused by the satisfaction of the conditions in the hospitality. In the total system problems, only 5% of the problems occur in the PLC, which shows that the reliability of the PLC itself is much higher than the reliability of external equipment. Among the 5% problems of the PLC, 90% of the problems are generated in the FO template, and only 10% of the problems are generated in the controller, that is to say, the problems generated in the CPU, memory, system bus and power supply of the PLC account for only 5% of the total problems of the system, and the problems generated in the FO template only account for 5% of the total problems of the system.
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