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Modbus tcp communication fault finding

  • I have Mobus TCP network communicating one PLC client & 18 nos of Feeders as servers. But sometimes any of server IP shows fault condition at PLC software after 1/2 secs fault disappears automatically & communication error is resolved. But when we taken wireshark trace through analyzer , we do not get any timeout/error in communication when actaully fault occurs at PLC. can u guide ?