Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 472)

F ACTORY T ALK V IEW S ITE E DITION U SER ’ S G UIDE
17–30
• •
•
•
•
Changing a gauge’s fill color at different thresholds
As the needle sweeps higher on a gauge, the area beneath the needle can fill with a color.
To help the operator recognize abnormal conditions, you can set up a gauge to change its
fill color when the tag value crosses a threshold. For example:
 If the temperature of an oven is lower than required for a recipe, the gauge can show
the temperature in blue.
 If the temperature is in the correct range for the recipe, the gauge can show the
temperature in green.
 If the temperature is higher than the recipe will accept, the gauge can show the
temperature in red.
If you use colored fills on a gauge, make sure enough of the fill is visible when an
abnormal condition occurs, so that the operator can recognize the condition.
Using graphs to compare values
Graphs display numeric values in bar graph format.
Graphs are useful for comparing multiple values, or for representing the fill levels of tanks
that suit readings on a vertical scale.
Use graphs instead of numeric displays when it’s important for an operator to analyze the
relationships between numeric values.
It’s easier for the operator to see that one graph is at a lower level than the other, or that
one graph’s fill is green and the other’s is red, than it is to subtract one numeric value from
another.
For example, one bar graph can show the required level of a tank of ingredients for a
recipe, and a second bar graph can show the actual level of the tank.
The first graph changes to represent the required level for each recipe, and the second
graph changes as the actual level in the tank rises or drops.
Changing a bar graph’s fill color at different thresholds
To help the operator recognize abnormal conditions, you can set up a graph to change its
fill color when the tag value crosses a threshold. For example:
 If the level of the tank of ingredients is lower than the recipe requires, the graph can
show the tank’s level in red.
Some people are color blind to red and green, so don’t rely on color alone to establish meaning.