Short description
Curve representations are used for process control in normal (production) operations or to diagnose faults. This guideline gives rules and recommendations for the presentation of curves on screen displays and for the control of trend displays. The application of these recommendations leads to presentations and control actions which are compatible with those for preformatted presentations, mimics and messages and which are conform with valid standards and are based on ergonomic findings. Consequent application of the recommendations leads to standardized man-machine interfaces at different workstations. This means that the configuration of curve presentations is simpler. Repeated deliberations and inputs are unnecessary for a single design, the correct interpretation of curve presentations where operators are used for different systems (e.g. in different control centres) is more accurate and easier. This guideline is valid for process control with screens in chemical and petrochemical plants, in plants for steam generation, as well as in plants of iron processing, if no special regulations are provided, e.g. for nuclear power plants.