It was not difficult to communicate a Koyo PLC with VTScada by means of Modbus TCP, being both, PLC and VTScada in the same LAN.
However, I have not been able to communicate them when the PLC is connected to a router outside the LAN of VTScada.
I typed a public IP address and the PLC port number when configured the TCP/IP port in the VTScada.
The resulting value of TCP/IP Port is -10,061.
Question is: Is this possible to connect a remote PLC to VTScada that way?