Schneider PLC maintenance
Model: TWDLCAA24DRF
Fault phenomenon: Communication anomaly
Fault analysis: provide fault information of the touch screen is not communication for Schneider PLC and weinview MT6070IH, according to the fault reason first eliminate the touch screen problem. Schneider PLC and weinview touch screen using RS232 communication line connection communication, communication line after the exclusion of PLC shell open, measuring RS232 communication IC voltage power supply +5V normal, PLC power supply and work lights are normal, connected to the computer PC and PLC communication found is not communication, PLC communication board fault. Measurement communication IC send and receive foot on the GND voltage is OV, power off measurement resistance is more than and 10 ohm. IC communications to burn. Replacement of new communication IC after measuring voltage is normal. Connect the computer to read the data is normal. Send a courier to the client normal.
Failure repair: replacement communication IC after the test is normal.
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