PageTrend
Displays a trend page with the specified trend pens. Use this function to display trends in a single cluster system with a single trend page. You need to create the trend page with the Graphics Builder and set the pen names to blank. Then display that page by calling this function and passing the required trend tags. Call this function from a menu of trend pages.
Note: Because you cannot mix templates in a
project, PageTrend will not work if you have included the
CSV_Include project in your project. For example, if your project
includes the CSV_Include project, PageTrend("pagename", "trendtag")
only works on trend pages based on XP-style templates (that is,
"Trend"). When using PageTrend to go to a page based on a standard
template (for example, "SingleTrend"), the page displays, but no
trend tag is added. This also applies for the CSV_Trend_Page
function.
This function is not supported in the server process in a
multiprocessor environment. Calling this function from the server
process results in a hardware alarm being raised. For a
multi-cluster system use PageTrendEx.
Syntax
PageTrend(sPage, sTag1 [, sTag2..sTag8] )
sPage:
Name of the trend page (drawn with the Graphics Builder).
sTag1:
The first trend tag to display on the page.
sTag2..sTag8:
Optionally trend tags 2 to 8 to display on the page.
Return Value
0 (zero) if successful, otherwise an error is returned.
Note: Before CitectSCADA version 5.0, page records
could be edited in the Project Editor. One of the fields available
for configuration was "Page Number". The value entered for a page
could then be used in runtime with the Page Cicode functions such
as PageDisplay(), PageGoto(), and PageInfo(1).
For example, PageDisplay("1") can
be used to display the page that has "1" (without the quotes) set
in the Page Number field. PageInfo(1) returns the Page Number of the
current page.
From version 5.0 on, this feature is only backwards-supported. The
"Alias" field in the project Pages.DBF file still contains the Page
Numbers from upgraded projects; however, the Pages database records
are no longer available for direct editing in CitectSCADA.
Related Functions
TrnNew, TrnSelect, TrendWin, TrendPopUp, PageTrendEx
Example
|
Buttons |
|
|
Text |
Process Trend |
|
Command |
PageTrend("MyTrend", "PV1", "PV2", "PV3") |
|
Comment |
Display the trend page with three trend pens |
PageTrend("MyTrend", "PV1", "PV2", "PV3")
/* Display three trend tags on a single trend page. */
See Also