The purpose of this function is to provide an overview of complex processes that have multiple variables, with the help of graphic pattern recognition. The order of the process changes dynamically as the actual values change. This type of data display yields a great deal of dynamic information on a single operating screen.
The operating screen is called a PRO (Pattern Recognition Object) image. The PRO image is based on the understanding that the human brain can remember shapes and colors much better than rows of numbers.
The PRO image creates a polygon by displaying each actual value of the individual parameters on its own level with a common time axis, which is then viewed laterally.
4, 6, 8, 12, 18, 24 or 30 process values are possible in a spider chart.
A conventional graph displays process values over time. It quickly becomes difficult to concurrently show many different parameters simultaneously and display them as graphs. More than four to six graphs make the picture confusing rather than informative.
Through the simultaneous displaying of the values and the drawing of a polygon, a shape is created. Each of these shapes results in a clearly distinguishable pattern that the user learns to recognize as a specific system condition. The markings on the individual axes indicate the correct operating range for the current system condition. The actual value of the individual parameters is displayed at the edge of the polygon.
The PRO data type display has many advantages:
- It provides an effective graphical overview of simultaneously existing process conditions.
- Several actual values are displayed.
- Continuous patterns for normal operation are displayed and faults can be detected at a glance.
- Because the display is compact, it takes up little space on the flowchart.
- Processing status patterns are captured and saved for future use.
- Stored patterns can be retrieved and placed over the real-time data.
- Actual values and the deviation from a defined time are displayed. Either difference display in percent or simple value display.
- Alarm display – if any of the included measurements are alarmed or a warning appears (e.g., upper or lower limit exceeded), the shape will assume the predefined color.
- The description (AKS code, long text) can be displayed if required. Display of the "Quickinfo" as ToolTipText.
- Variability display bars indicate the extent to which each parameter has changed over a set period of time (6, 12, 24 or 48 hours).
- The values can be scaled to give a circle for normal operation. People recognize shapes and colors much faster than complex series of numbers.