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4.1
Displaying Trend Data
Accessing the
Trend Directory
Real-Time Trend
Displays
4-2
Trends
The Trend Directory lists the configured trend names and their
corresponding descriptors. The directory lists one trend on each line.
To access trend displays, follow these steps:
1.
Set the system state to Operate. The system displays the navigation
area on all OSx stations where a user is logged in.
2.
Select the
Directory
types appears.
3.
Select either the
screen displays a list of trends.
4.
Select the trend that you want to see. OSx plots the trend on the
screen.
Real-time trend data is collected and displayed in strip-chart format with
the oldest value on the left and the newest value on the right
The operator can adjust the size of the data display to show minutes or
hours. When the operator requests a real-time display, OSx first displays
historical values for the duration specified for the viewing window.
OSx displays trend data as a continuous line. As new real-time data
appears on the right side of the screen, the older trend data scrolls off the
screen to the left. The current value for each variable is shown in numeric
format to the right of the chart. If no data is available for a specific period of
time, the trend line turns magenta for that period.
When the operator selects a new display to replace the currently displayed
real-time trend, all previously displayed real-time data is lost. If the
operator returns to the previous trend, OSx first displays historical data
and then real-time data.
To obtain an exact value at a given time, move the cursor into the graph
area, placing it at the time needed, and click the left button. A vertical line
appears at the selected time and a pop-up list displays values for each tag in
the plot
(Figure
4-1).
icon from the navigation area. A directory of display
or the
Historical Trend
option. The
Real Time Trend
(Figure
SIMATIC PCS 7 OSx 4.1.2 Operator
4-1).
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