If the connection to Corvina cannot be established, check the list of possible causes.
Make sure the communication settings for the RS232 or RS485 interface in the PLC and in the FP‑I4C unit are identical in both devices.
Check the wiring. For RS232, there are three wires (R, S, and G). Make sure G is connected to G, R to S, and S to R.
The system was not ready yet. Wait a few seconds, then test the connection again.
The PLC is not ready (powered off).
If you are using HMWIN Studio, make sure COM1 is not used by your HMWIN Studio project.
Open your browser and enter the URL https://[IP address]/machine_config. Replace [IP address] with the IP address of your FP‑I4C unit (e.g. https://192.168.100.10/machine_config). Check your settings under . Substitute "xxx.xx" with the last digits of the unit's IP address (e.g. https://192.168.100.10/machine_config).
Make sure the activation code is correct.
For BSP versions 1.3.859 or lower, you must enter the server "pairing.pieu.corvina.io" manually.
Check the Internet connection of the FP‑I4C unit.
Check if there are any port restrictions in your network. The FP‑I4C unit uses port 1194 UDP to connect to Corvina. Make sure this port is not blocked.
Make sure the time and date in the FP‑I4C unit are correct. Otherwise, the certificate is not accepted by Corvina. Go to the Time/Date page in the FP‑I4C Web interface and set the correct time and date.
Make sure the DNS is set correctly. Open your browser and enter the URL https://[IP address]/machine_config. Replace [IP address] with the IP address of your FP‑I4C unit (e.g. https://192.168.100.10/machine_config). Check your settings under .
Make sure you are logged in with the Corvina Cloud Lite App (check status displayed at the bottom of the browser). See Step 6: Connect the PC to Corvina.
If you have more than one network configuration on your PC, make sure you are connected to the right network. We recommend that you disable the other networks (e.g. Wifi). Otherwise, you need to determine the interface for your Corvina connection and enter the corresponding IP address in Control FPWIN Pro7 with .
Check the LAN cable connection between the router and the Ethernet port of the FP0H PLC, and make sure the PLC is powered on.
Make sure the IP address is set correctly for the PLC and on the Corvina Platform.
Make sure your network is not blocking the connection (e.g. when a proxy server is used).
Make sure a system or user connection with source port 9094 is enabled in the project downloaded to the FP0H PLC. See Step 1: Connect the FP0H PLC to the network.
Make sure the Router / NAT / Port forwarding function on the gateway (FP-I4C unit) is enabled. See Enable the router function.