Who did what, and when: activities such as parameter modifications and user access operations can be tracked by the HMI solution, generating a log entry for every relevant event.
Tracking is provided by dedicated system objects: user logins and changes to the values of writable items can be recorded either to plain text files or to a database of your choice, using the same database connectors described in Database integration ($SYS.Utility.UsersLoginTxt, $SYS.Utility.UsersLoginSql, $SYS.Utility.UpdatingValuesTxt, $SYS.Utility.UpdatingValuesSql), so the traceability data ends up exactly where your quality system expects it.
For the company this answers a growing need: demonstrating how the plant has been operated. Traceability data supports quality procedures, helps to reconstruct the sequence of events after an anomaly, and gives production and maintenance managers an objective picture of what happened, when, and by whom.
Users can log in to the HMI system in the classic way, with user name and password, or by means of RFID badges. The access mode is configurable and can even be hybrid, combining both methods: a badge makes the access faster and personal, encouraging operators to work each with their own identity, which is the foundation of meaningful traceability.