The maintenance content of PLC control system

Daily maintenance of PLC daily maintenance and maintenance is simple, main is replacing the fuse and lithium-ion batteries, basic no other vulnerable components. Due to store the user program of random access memory ( RAM) , counters, and which has the function of keeping auxiliary relay are protected with lithium batteries, lithium battery life is about 5 years, when the voltage decreases to a certain degree of lithium-ion batteries, battery voltage drop to the indicator light on the PLC basic unit, alert the user to have a lithium battery support program still can keep a week or so, the battery must be replaced and this is the main content of the daily maintenance. Changing the steps as follows: lithium-ion batteries s before disassembling, should let PLC electricity more than 15 seconds, This makes as memory backup power capacitor charging, after lithium battery disconnect, the capacitance can do short of power supply to the PLC, in order to protect the information in the RAM is not lost) ; S broken PLC ac power; S open the basic units of the battery cover plate; S to remove the old battery, install new batteries; S cover the battery cover plate. Pay attention to try to replace the battery time is short, generally does not allow more than 3 minutes. If the time is too long, in RAM program will disappear. In addition, attention should be paid to specify model should be used when replacing the fuse. I/O module replacement if need to replace a module, the user should be confirmed by installation of the module is the same type. Some I/O system allows charged replacement modules, while others need to cut off power supply. If a replacement can solve the problem, but in a relatively short time and then fails, then the user should check can generate voltage inductive load, may need to hold the current peak from outside. If after the replacement of susceptible to blow a fuse, is likely the module output current overrun, or output device is a short circuit. The fault diagnosis of PLC is a very important problem, is the key to ensure the normal order of the PLC control system, reliable operation. In this paper, the commonly used fault diagnosis methods are discussed in this paper. In the actual work process, should fully consider the various unfavorable factors of PLC controller, regular inspection and maintenance, to ensure that the PLC control system safe and reliable line operation.
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