Alarm Indicator
The high performance HMI design techniques make use of an object called the Alarm Indicator which displays a colored shape when there is a problem. This works well with the high performance HMIs as color is only used when there is a problem. The Alarm Indicator can contain descriptive text in addition to the shape and color, and is usually placed near the component that is causing the problem. You can import the Alarm Indicator, shown in the example below, from the Cloud Templates.
The Alarm Indicator represents different levels of alarm with different shapes, color, and descriptive text. For example, a motor that exists in an industrial setting is monitored by a high performance HMI. There are two alarms on the motor. The first is a high priority alarm associated with the motor when over heating, will display as a red square with the number 1. The second is a critical alarm associated with the motor becoming seized, will display as a yellow triangle with the letter 2. An Alarm Indicator is placed near the motor, positioned in such a way to clearly show motor that the indicator is referring to.
Given this scenario, a high performance HMI will show the Alarm Indicator as in the following examples:
Example 1
The motor is critically faulted. This is the highest priority.
Example 2
Motor is overheating resulting in a high alarm.
Reducing Ambiguity
A high performance HMI design technique to reduce ambiguity incorporates a line from the Alarm Indicator to the object experiencing the alarm.
The following example shows how this technique can ensure that the viewer associates the correct Alarm Indicator with the correct motor.