When operating via the Modbus TCP protocol, creation of virtual COM ports is not required, and all you need is opening a port (502 by default) in Windows firewall.
Change a protocol to Modbus TCP/IP.
The title change its appearance. Now the title displays a number of a TCP port used for exchange.
If the port 502 suits you, start to configure the OPC server. Otherwise, open the window of port configuration, and change the port.
Let's configure the OPC server.
Add the communication node. When configuring Modbus TCP, two parameters must be set: IP address and IP port. 127.0.0.1 is an IP address of the local computer (localhost), and therefore remain this address without changing in order to provide connection to the simulator. If you have not changed a port number in the simulator, remain 502 here.
Other configuration of the OPC server is made similar to the configuration for Modbus RTU: you should add a device (as a rule, a device address is 1 always in Modbus TCP), and then add tags with required addresses and registers.
Next, switch the server to the run-time mode.
