Mitsubishi PLCFX2NCPU plate fault solution

Create Date: 2024-8-30 12:03:23|Source: Mitsubishi Electric/Mitsubishi Electric

Customer's description of the problem: Mitsubishi FX2N-32MR-001, the PLC running light does not light up after powering on, and the alarm light is always on (hardware problem)

                                 Mitsubishi PLCFX2NCPU plate fault solution

Detection and repair: Turn on the power supply, power on the PLC, according to the detection process, the CPU-E alarm light is always on after the PLC lights up the POWER light, and investigate the operation switch in the RUN position, but the RUN operation indicator light is not on, which can preliminarily judge that there is a software or hardware problem on the CPU board.

According to common sense, first through the computer software, the PLC program of the PLC memory is downloaded to the computer, and saved, and then performed once in the compilation software GX-Developer, the process is online - eradicating the PLC memory - selecting PLC memory, data soft components, bit software components - fulfillment, investigating the CPU-E light is still on, and it can be judged that the CPU board of the PLC has hardware problems.

There is a certain degree of difficulty in the hardware repair of the CPU board, because the external technology of each manufacturer is secret, and the CPU chip is difficult to buy on the market, so it can only be confirmed step by step on the premise that the peripheral circuit is not faulty, and the problem can only be replaced in most cases in the CPU chipThe online measurement of capacitance is more complicated, the method of replacing one by one is adopted, after each replacement of a capacitor, perform a removal of PLC memory operation, when replacing a small capacitor and then eradicating PLC memory, the alarm is eliminated, the test program is downloaded, the whole machine is tested, all are normal, and the machine is corrected.

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