Rockwell Automation 2711E-ND1 Reference Manual PanelBuilder 1400e - Manual (Page 171)

Trends
Publication 2711E-6.15 – November 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 Firmware 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
number data points at a time on the screen. This depends on the
horizontal display resolution of the screen, which can be either 640
or 800. An example of a Trend object is shown below.
Important: When using the high resolution 800 by 600 application
screen, we recommend you install additional memory in
the PanelView terminal to meet the increased memory
requirements. For PanelView 1400e terminals, use the
System Memory Upgrade Kit for 1400e terminals (A-B
Catalog Number 2711E-URAM2).
About Trends
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