Rockwell Automation 2711E-ND1 PanelBuilder 1400E Reference Manual - Manual (Page 155)

Trends
Publication 2711E-820 – January 1998
Trends
This chapter tells you about:
•
how Trends function
•
how to configure Trends
Trends allow the operator to track process variables over a period of
time. The Trend is a dynamic, graphical display object with time on
the horizontal axis and the value range of the process variable on the
vertical axis. For example, you can use Trends for Proportional
Integral Differential (PID) loop tuning or for data analysis.
Note: If you use the Trend object the application will be compatible
with PanelView Version 2 or later. It will not be compatible with
earlier versions.
You can use up to four Trend objects per screen. The Trend object
consists of a panel, up to four pens, value indicators for maximum,
median and minimum, and time and date displays for the maximum,
median and minimum values. Time is displayed on the horizontal
axis; values are displayed on the vertical axis. You cannot change
this orientation of the Trend object.
The Trend uses a pen to plot each variable. You can use up to four
pens per Trend object to track up to four process variables. The
values plotted on a Trend object are called data points. The number
of data points is determined by the number of pens in the Trend, the
sample rate, and the time span covered by the Trend. The number of
data points that can be displayed on the screen is determined by the
width of the Trend object. Each pen can display a maximum of 640
data points at a time on the screen. An example of a Trend object is
shown below.
About Trends
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