Operator Terminal System Manual - 11276916.pdf

I
8 Trends
0
Display in run
mode
Unit Functions
In run mode, trend curves can display continuously measured values. Select the
required trend object and press the Enter key. This opens a dialog box. Select a time
interval and date for the data to be displayed. "History" is displayed in the bottom area
of the dialog. To go back to real-time display, press the Enter key again. The trend data
are stored in files. You specify the name when defining the trend object.
Real-time trend Only applies to DOP11A-20.
The real-time trend displays analog values from the controller in a trend object during
run time. The values are displayed in curves. No values are stored in the project memory
of the terminal. No continuously measured data are displayed.
Several independent trend curves can either be displayed in the same block or in different
blocks. A maximum of 10 trends can be used per application.
Defining trend
objects
You can define trend objects in a block exactly like other dynamic objects. You can link
the object with up to six analog signals (maximum 10 trends per projects with DOP11A-
20).
Unlike other objects, the trend object name must be specified using 1-8 characters. The
first character must either be a letter or a number. A-Z, 0-9 are permitted characters for
the trend name. The same file name conventions apply as for MS-DOS.
You can define the following parameters for the trend object. Under [Setup] / [Terminal
options], you can define if you want to save changed trends or all samples.
214 System Manual – DOP11A Operator Terminals