in our system we have some abb 450 PLC and HMI connected together through masterbus MB300.All nodes are connected to the bus through transivers.For last few days communication between the nodes has become very slow.The transivers have been changed . the end resistor(terminators) have been checked and found ok.the PLC communication cards have been changed but the problem persists.Anyone have experienced same problem ?
slow network abb ac450
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