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Recently in our coal-thermal power plant, two 500MW units of maxDNA DCS had a simultaneous complete loss of logics of all 214 processors (active and redundant included) leading to extremely dangerous plant conditions. The incident occurred when a faulty common domain ethernet switch was restarted. The incident repeated again after 3 days while reconnecting uplink communication of another common domain ethernet switch, leading to similar situation. With both units under safe shutdown, it was tested again and the complete failure occurred for a third time. Root cause analysis is still in progress by DCS supplier, no solution has been received yet. I request all to please share & discuss similar incidents.
