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I use the Modbus protocol to get some data from Modicon 984-685E PLC. After several hours the PLC halts with "State RAM Test failed" message in its stop code. I wonder could my software disturbs PLC operation, and if so How it can possibly happen so that I can correct my software. I use Labview for the Modbus driver and the application. The PLC was configured in RTU mode Thanks very much