Ethernet switch stop and PLC Allen Bradley


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Can someone give an explanation about what is happened to me. we have Ethernet switch installed on Allen Bradley network which fails, and when it is rebooted, all the PLC control logic on the network fail by watch dog fault and one of them loose completely the logic. I have change the switch by new one Nortel, the old one was Phoenix and I reset the faults from all the PLC and the situation is restored. Please I need to know what happen exactly.