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Is it possible to have 2 separate networks connected to the C445 Ethernet card at the same time?

Yes, but only one network master should be used for control. The other(s) should monitor only.

The C445 Ethernet card supports both Modbus TCP and Ethernet/IP simultaneously. The protocol is auto detected. The card supports 4 Ethernet connections / sockets. So, 4 masters on Modbus TCP and/or Ethernet/IP can communicate with the C445 simultaneously. At the same time, a Modbus master can also be communicating with the C445 via the optional RS485 Modbus port. 

C445 Product Overview