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The most important protocols can be secured using following certificates:

  • Communication between Automation Builder and the PLC (e.g. Programming, Monitoring)

  • Communication between the PLC’s webserver and visualization clients (browsers)

  • Communication between the PLC’s FTP server and FTP clients

  • Communication between the OPC UA server and OPC UA clients

For complete list of the secure protocols refer to chapter 3.4.3 of the ‎⮫ Cyber security in the AC500 PLC family.

As a prerequisite to enable secure communication on one or more protocols, the required certificates need to be present on the PLC.

For security reasons ABB does not encourage the use of self-signed certificates. ABB shall not be held liable for any damage or loss that arises due to the use of self-signed certificates on AC500 PLCs.

Self-signed certificates protect against eavesdropping if used correctly. They do not offer any secure means of authentication.