Color Values

Help Contents

Introduction

In SCADA systems color can be used to indicate:

Equipment states. For example, whether a pump is running or stopped.
The state and severity of Alarm Conditions.
The different pens on a Trend.

The rest of this page describes how colors are configured in Fernhill SCADA.

Configuring Color in Fernhill SCADA

In Fernhill SCADA you can configure a color using:

A Color Keyword, for example: Red.
An RGB Color Value, for example: #F00.
A HSL Color Value, for example: hsl( 0, 100%, 50% )

Color Keyword

A color keyword is an identifier that corresponds to a color value. For example:

Red corresponds to #FF0000.
Green corresponds to #00FF00.
Blue corresponds to #0000FF.
Black corresponds to #000000.
White corresponds to #FFFFFF.

For the complete list of supported keywords, see Named Color Values.

RGB Color Value

An RGB color value sets the red, green and blue components of the color separately. For example:

Example	Description
#f00	Three digit hexadecimal.
#ff0000	Six digit hexadecimal.
rgb( 255, 0, 0 )	Function notation using decimal values.
rgb( 100%, 0, 0 )	Function notation using a percentage to set a color component.

Note: These are different ways to define the color red.

Hexadecimal notation is the '#' character followed by three or six hexadecimal characters. The two notations are called three-digit and six-digit respectively. For example:

Green in three-digit notation is: #0f0.
Green in six-digit notation is: #00ff00.

The three-digit notation is expanded to the six-digit notation by copying digits. For example, #08f expands to #0088ff. This ensures that white (#fff) can be represented in three-digit notation accurately.

Function notation uses the function name "rgb" and three parameters to set the red, green and blue components of the color.

HSL Color Value

A HSL Color Value is defined using three parameters:

Parameter	Description
Hue	An angle on the color circle, measured in degrees. 0 corresponds to red, 120 corresponds to green and 240 corresponds to blue.
Saturation	The percentage saturation of the color. 100% is fully saturated. 0% is a shade of gray.
Lightness	The lightness of the color. 100% is white. 0% is black.

Examples:

hsl( 0, 100%, 50%) corresponds to #FF0000 (Red).
hsl( 120, 100%, 50%) corresponds to #00FF00 (Green).
hsl( 240, 100%, 50%) corresponds to #0000FF (Blue).

Where to Use Color Values in Fernhill SCADA

You can use a Color Value in these area:

In the configuration properties of the Database Root Tag to set common colors.
In the configuration properties of the Digital Data Point Tag to associated a color with each state.
In the NormalColor property of these data point tags:
In the Plot Editor to edit the properties of:
- A Trend Plot Tag
- A Value Duration Plot Tag
In the Graphic Editor when editing:
In the PlotAddPenEx Function.

Further Information

Fernhill SCADA Concepts

To learn about other Fernhill SCADA Concepts.

Glossary

For the meaning of terms used in Fernhill SCADA.