Hello Furkanayeng

Which HMI Do you use and which Certificate are asking about, it is the same as in the parent topic?

(Unified Comfort Panel and PLC communication certificate?)

If yes, in most cases you will not need to do something special on the panel.

If the Panel and the PLC are in the same TIA project just create a certificate for the PLC for Secure HMI Communication (in TIA Portal not in WinCC Unified Cert Manager)

Then download PLC and HMI complete and the certifiacte should be transfered automatically to PLC and HMI. you have to set the Date/Time correctly and this should be all steps.

IF this do not work or its another situation then we will need more information.

Which Version of TIA do you use (with Upd), wich Image Version do you have installed on the Panel, which PLC and which FW Version do you use?

Which Error message do you get on the Panel in alkarm control?

Bye Murof