The flow chart of PLC troubleshooting methods and countermeasures

This paper enumerates the flow chart of PLC controller 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 controller troubleshooting 1, the flow chart of the overall inspection according to the overall inspection to find fault point direction, progressive elaboration, to find out the specific fault, as shown in figure 1. Figure 1, 2, power failure check power lights don't need to inspect the power supply system, check the flow chart shown in figure 2. Figure 2, 3, operation fault check the power supply is normal, operation indicator light is not bright, for some abnormal system has terminated the normal operation, check the flow chart shown in figure 3. In figure 3, 4, input and output fault check input and output is PLC 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 shown in figure 4, shown in figure 5. Figure 4 figure 5 5, the external environment of the inspection are the major factors influence of PLC work environment temperature, humidity, noise and dust, and corrosive acid alkali etc. Second, programmable controller input, output, unit troubleshooting programmable controller input table 1 unit troubleshooting table 2 programmable controller output unit fault handling
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