Controls and Control Indicators for Analog Output Tags

For analog output tags, controls are required to change the value of the tag and its related equipment to a precise continuous value, often to the decimal point. There are two methods by which this can be accomplished:

•      Moving a slide up or down to adjust the value; or

•      Entering a precise value into a field.

In addition to the output of a signal, it is often useful to include drawing methods that portray the value being output. For example, if you have drawn the tag using a slide that sends a precise value to equipment, you may find it useful to also draw the same analog output tag with numeric value indicator to reflect the outgoing value as a number. An example is shown in Figure 8:

Figure 8

In this example, as the slider is moved on the scale, the resulting outgoing value is displayed in the field below the scale.

As we go on to build the tutorial application, we will explore the tag drawing methods for analog and digital input and output tags in greater detail.