In the operation and monitoring environment, two types of screen modes are available. Operators can select either the Multiple-window mode like an office PC, or the Full-screen mode like the legacy operator console.

Multiple-Window Mode	Full-Screen Mode

The data displayed on HIS are collected in the manner of event driven, i.e., HIS starts to collect the data only when the corresponding window is called up. Thus only the dynamic data in the currently displayed windows need to be refreshed. The load of HIS for data sampling is reduced and the one-second refresh rate for the dynamic data on the windows is guaranteed.

The process control industry standard open interface OPC (OLE Process Control) is provided for collecting the process data, trend data and messages.

To prevent operator errors and other problems and ensure the safety of the system, such as prohibiting operations by unauthorized persons, limiting the ranges of operation and monitoring, and restricting operator actions to the system, extensive security functions are applied accordingly.