West Control Solutions KS98-1 - Manual (Page 72)

II-4.6 Trend function
Survey of the characteristics
Apart from the trend function specially designed for “Controllers” (CONTR, CONTR+) of the simulation package SIM/KS
98-1, additional trend windows can be implemented. Each trend is able to display 7 analog values and 12 logic states
from the Engineering against a time axis. Several independent trend displays can be shown simultaneously.
As soon as the trend function(s) have been called (L1READ), and the Engineering has been transmitted to the KS 98-1
or SIM/KS 98-1, the trend dialog window is opened via the menu item <Options><TREND>.
w Trend dialog window
This window is used to select the required trend function, its duration, and the time interval. Clicking the START
button initiates the trend recording function, and a display window is opened for the selected trend curve. In this
way, it is possible to open several display windows.
Display window
Two different scales can be assigned to any pair of measurement values, which simplifies interpretation of the trend
curves.
The length of the time axis is adjusted by means of “Sampling cycle time” and “Number of measurement values” (sam -
ples) for each trend display. The time axis is either “absolute” with date and time (hh:mm:ss) or “relative” (changeable
during the recording).
The exact analog values are shown numerically at top left in the display window. If the cursor line is active, the analog
values can be read precisely at any point of time. Trend display can be stopped (frozen) and resumed; the measurement
continues in the background!
By holding down the left mouse key, the cursor can be used to mark an area for enlargement.
This zoom function is canceled via <View><Complete display>.
Engineering tool operation 9499-040-82711
II-72 Trend function
Fig.: 93 Trend display