A Tag binding is a very straight-forward binding type. It simply binds a property directly to a Tag. This sets up a subscription for that Tag, and every time the chosen Tag changes, the binding is evaluated, pushing the new value into the bound property. If you choose a Tag in the tree, and not a specific property of that Tag, the Value property is assumed.
Drag and Drop
There are several ways to drag and drop Tags onto a component allowing you to create screens very quickly. You can quickly bind a Tag by dragging it from the Tag Browser into a component or into the component property.
Binding to a Component
Ignition automatically creates the Tag bindings to several of the component properties when you choose to bind a Tag to a component by dragging and dropping. This is true for both creating a component by dragging and dropping a Tag onto empty space on a window at the same time Ignition prompts you for what type of component you want to create, and by dragging and dropping a Tag directly onto a component that already exists on a window. In both cases, Ignition automatically creates the Tag bindings on the component.
In addition, some of the bindings will be bidirectional or they may be expression bindings. How Ignition handles the binding depends on the disparity between the data types of the Tag and the target component. For example, binding a numerical Tag to a label component will result in an expression binding that formats the number to a string.
Binding to a Component Property
Ignition automatically creates a Tag binding to the property that you dropped the Tag into in the Property Editor, resulting in the property binding to the value of the Tag. In addition, it is possible to bind the Tag attributes to the component's property. For example, the Tag's Engineering High Limit attribute could be bound to the capacity property of a cylindrical tank component.