Configuring an Easy Chart using the Symbol Axis
Another feature of the Easy Chart is the use of the Symbol Axis type. Instead of showing numerical values on the axis, the Symbol Axis type can show plain text on the axis.
The second subplot in this Easy Chart uses a Multi-State Button component to demonstrate the use of the Symbol Axis type. The Multi-State Button component is bound to an OPC Tag, and the value of the Tag is stored in the Tag History system. Instead of showing the numerical values '0,' '1,' and '2,' you can use plain text such as 'Hand,' 'Off,' and 'Auto.' This is helpful to an operator who immediately knows the state of the equipment instead of having to learn what the numeric values mean.
- Click on your Easy Chart component, and select Customizers > Easy Chart Customizer.
- Click on the Axes tab, then click the Add icon to add an axis.
- Enter a Name, we chose 'Axis 2'. Enter a Label, we called 'State'.
- In the Type field, select 'Symbol' from the dropdown.
- In the Symbols/Grid Bands field enter 'Auto,' 'Off,' and 'Hand' separated by commas, and no spaces. (Note: The order of the symbols when you type them in, will be ascending order on the axis).
- Click OK two times.
- Put the Designer in Preview Mode .
- Toggle the Multi-State buttons to begin logging data to your Easy Chart. Data for the Multi-State Button component is collected in the second subplot which is using the Symbol Axis type. The first subplot is data for another Tag using the Numeric Axis type.
This Easy Chart example above shows the subplot feature of the Easy Chart component and how easy it is to break up the chart plot area into multiple distinct subplots sharing the same X axis. It is a good way to display lots of data from different Tags in one Easy Chart.