In the final application, an appropriate security environment needs to be in place for protecting both the operational environment and the safety-related systems.
For this purpose, a threat and risk analysis (TRA) according to IEC 62443 needs to be carried out on a final application system level.
An adequate reduction of risk against malevolent attacks is necessary for a meaningful application of this part. OPC UA Safety does not describe any measures which will lower the risk of malevolent attacks, but addresses the topic “functional safety”, only.
During compliance tests to OPC UA Safety, security aspects are not part of the scope, as it is assumed that the underlying base mechanisms (i.e. methods) already provide adequate security.