Exporting the certificate with public key of PKCS12 certificate - References - SIMATIC AX - AX Hardware Engineering documentation - Hardware Engineering,

As described in certificate handshake with PLC during connection establishment page, the public key of the TLS certificate which is downloaded to the PLC must be provided to all clients which establish a connection with the PLC. Via the steps mentioned in this section, the public key of the PKCS12 certificate can be exported, and then can be provided as a parameter to the Hardware Loader.