The flow chart of PLC troubleshooting methods and countermeasures

This paper enumerates the flow chart of PLC five troubleshooting method lists the conventional input, output, unit fault handling countermeasures. PLC self-diagnosis of PLC controller has a strong ability, when their own fault or peripheral equipment failure, can be used with indicator for the diagnosis of PLC destroy the light of light-emitting diodes (leds) to the diagnosis. One, the flow chart of PLC troubleshooting 1, the flow chart of the overall inspection according to the overall inspection to find fault point of direction, progressive elaboration, to find out the specific fault, as shown in figure 1 is shown in figure 12, the power failure inspection power lights don't need inspection on power supply system, check the flow chart is shown in figure 2. Figure 23, operation fault check the power supply is normal, operation indicator light is not bright, the system has been suspended due to some abnormal normal operation, check the flow chart shown in figure 3. Figure 34, input and output fault check input and output is PLC controller and the external equipment information communication channels, whether its normal work, in addition to related to the input and output unit, also with the connecting wiring, terminal blocks, insurance tube components such as state. Check the flow chart as Desmond tutu 4 figure 55. The external environment of the inspection are the major factors influence of PLC work environment temperature, humidity, noise and dust, and corrosive acid sealed.
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