Object PmaTrendGroup (Trend group)

Description:

See: PmaTrendGroup - Deatiled object description

The object stores the time history of variables defined on the "Data" page into the memory and on the computer hard disk. The storing is performed in the optional periods by the Run, RunTime methods. For viewing the archived data the PmgTrendViewer object can be used, respectively either in the panel of the client PROMOTIC application or in the Web browser (Chrome, Firefox, Edge, InternetExplorer).

No other Pma objects can be created in this object.

This object can be created in objects: PmaRoot, PmaFolder, PmaPrototype. Multiple objects of this type can be created in such objects.

This object adds variables into the calculation of the application size, which influences the basic runtime license type/size (see: Price list of the PROMOTIC system ).

This object adopts properties and methods of object PmaObject.

Properties and methods:

AddFilter	Adding the value filter
BackupCreate	Creates a new backup
BackupInfo	Returns information about saved trend data on the disk
ClearHistory	Remove all archived data
Close	Close the trend archive
Count	The number of variables in the object
CreateFilter	Creates the value of the filter range for next methods
GetData	Returns the stored data
GetGroupTitle	Returns the user defined name of trend group
GetPersistInfo	Returns information regarding data saving on the disk
GetTime	Returns requested time
GetValueByTime	Returns a value (or more values) of a variable (more variables) by the specified time
GetVarExtensions	Array of all data extensions registered into this object
GroupId	Group identifier
Item	Access to variables of type PmVar of this object
ItemEx	Access to variables of type PmVar of this object
Open	Open the trend archive
Run	Save the current values with the current time
RunTime	Save the current values with the specified time
SaveToFile	Storing data of this object into the file
SetValueByTime	Writing the value (more values) of a variable (more variables) by the specified time.

Events:

onAddRecord	Is triggered on the request for saving the values
onBackupCreate	Is triggered on the request for creating new backup
onError	Is triggered on the object error

Configuration windows:

Object	General information about the object
Content	Content of the object in the XML form
Events	Definition of object events algorithms
Data	Definition of trend group data
Trend	Basic settings of group of trends
Storage	Disk data persistence configuration
Permissions	Object permissions
Web server	The link-up of the object to the Web server