Siemens SIMATIC PCS 7 Operating Manual page 143

x-y chart
The way in which information is displayed with x-y charts depends on the specifications in the
device description. The following displays are typical:
● Representation of static trends
● Representation of parameters that change at certain events
Display mode
The trend display mode can be selected in the trend charts by using the toolbar that is available
in the "Display mode" drop-down list.
Modes:
● Strip
● Scope
● Sweep
● Static
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– The most recent value is always shown on the far right of the chart.
– The user can change the length of the time interval.
– The time axis shows a defined time interval.
– The first value for the current time interval is always shown on the left-hand side of the
chart. The subsequent values are always assigned to a time that falls within the time
interval shown. The final value for the time interval that is being displayed is always
shown on the right-hand side of the chart.
– As soon as a time interval expires, the displayed values are deleted.
– The first value for the subsequent time interval is always shown on the left-hand side of
the chart.
– The time axis shows a defined time interval.
– The first value for the current time interval is always shown on the left-hand side of the
chart. The subsequent values are always assigned to a time that falls within the time
interval shown. The final value for the time interval that is being displayed is always
shown on the right-hand side of the chart.
– The values that are displayed in the chart get overwritten by the values for the
subsequent time interval.
– The time interval is not updated.
– The user can change the displayed range however he or she likes.
– Recommendation:
Use this display mode to display static values.
Functions
7.9 Graphical displays
143