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Even though the HMI application is a visual/ graphic interface, you should not select the colors and shapes simply to have a stylish, good looking display. The focus should be on facilitating project comprehension. 

There is a set of color convention conventions that is are recommended for HMI projects. . .

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Value = 0 // Off/De-energized/Idle/Stopped/Closed
Value = 1 // On/Energized/Running/Open
Value = 2 // Disabled/Out of Service

These values follow a Color Convention color convention pattern for HMI displays.

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The user can use this page to easily create new themes or edit pre-existing ones. The following images show some examples using different themes.

Alarm Indicator

This Symbol symbol acts as an indicator for the Alarm State alarm state of an a specific Tagtag. It can display the alarm priority level (low, medium and high), and it have has 3 different color configurations according to the Alarm State:. See image below. 

There is a Tag tag property called AlarmPriorityEnum that is used for animating the Alarm Indicator Symbolsymbol. The Enum property has the following settings:

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To illustrate the behaviors described above, the following images demonstrates the appearance when display's appearance when an alarm is in active state.

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