Learn how to use the TLS connector to transmit PLC data securely via the popular Modbus TCP protocol.
The TLS connector is designed to implement encrypted and secure connections between devices. The FP-I4C unit can act as both a TLS client and a TLS server. This allows the Modbus TCP Security protocol to be used. TLS V1.2 and TLS V1.3 are supported. In addition, the Panasonic MEWTOCOL communication protocol can be encrypted and transmitted securely. The implementation can also handle your proprietary protocols.
Configuration
There will be a pair consisting of a PLC and a FP-I4C unit on each side. One pair will be configured as a TLS client and the other as a TLS server. Knowledge about the handling of the PLC, the FP-I4C unit, Control FPWIN Pro7 as well as the correct wiring and network technology is expected and will not be explained in this tutorial.
Basic communication sequence
The PLC sends a Modbus request via Ethernet to port 8888 of the FP-I4C unit.
The FP-I4C unit forwards the telegram encrypted by the TLS client to the TLS server.
The TLS server receives the data and forwards the decrypted telegram to port 502 of the PLC.
The response is processed in the opposite direction through the two FP-I4C units back to the PLC that initiated the request.
