In contrast to the standard trend graph, the X-axis in an ibaQPanel trend graph can be time-based or length-based.
Serving as time axis, the time range can be set or controlled by a signal. The X-axis can be fixed or scrolling.
The date can be displayed in addition to the time. You can select a two-digit display of the year. Otherwise, a four-digit display is shown.
The pause signal can be enabled optionally. The pause signal is always a digital signal. As long as the pause signal is TRUE, the scrolling in the QPanel display is paused. A gap is inserted where the pause occurred. The gap is always 20 pixels wide independent of the duration of the pause.
When serving as length axis, more settings are required.
The length range determines the maximum length value on the scale. You may enter a fixed value or – if length range can change from time to time – select a signal providing the length range.
For a proper labeling, set the correct length unit (m, mm, ...)
The actual length should be provided by an analog length signal, which can be selected from the pick-list.
You can set a length resolution value to make the length-controlled feed of the graph a bit smoother.
The "Length is reset if it drops more than ... m" parameter determines the threshold for the length signal. If the actual length shows a sudden decrease of more than the specified value, the length is reset and the feed starts again.
Depending on the feeding mode, different behaviors apply:
|
Mode |
Behavior |
|---|---|
|
Scrolling |
The length value determines the visible range of the base axis. The base axis starts at 0 and scrolls in the specified direction until length value is reset. Then a gap follows which indicates the length reset and the scrolling starts again as soon as the length value increases. |
|
Fixed and clear at maximum length |
The fixed base axis shows a scale from 0 to length range value. The graph shifts in the specified direction. The graph is cleared when the length signal is reset. If the graph reaches the end of scale before length reset (length range is smaller than the actual length), the base axis shifts for another length range. |
|
Fixed and double length range at maximum length |
The fixed base axis shows a scale from 0 to length range value. The graph shifts in the specified direction. The graph is cleared when the length signal is reset. When the graph reaches the end of scale before length reset (length range is smaller than the actual length) the base axis is rescaled to double the length range. The graph continues shifting to the middle of the base axis. When the end of scale is reached again before length reset, the scale is doubled again (4 times the original length range). |
|
Fixed and increment length range at maximum length by x m |
The fixed base axis shows a scale from 0 to length range value. The graph shifts in the specified direction. The graph is cleared when the length signal is reset. When the graph reaches the end of scale before length reset (length range is smaller than the actual length) the base axis is extended by the specified length. |
|
Fixed and start scrolling at maximum length |
The fixed base axis shows a scale from 0 to length range value. The graph shifts in the specified direction. The graph is cleared when the length signal is reset. When the graph reaches the end of scale before its length reset (length range is smaller than the actual length), the base axis moves with scrolling speed. |