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Data - page of object PmaCommGroup

Description:
Communication group data definition. The form of the page is common to more Pma objects and hence the common description is stated in the description of the "PmaObject > Data" page. Only configuration items of one variable are described here that are specific only for the page of this object.
Buttons:
Adding one or multiple new variables.
New variable - Opens the Variable window, where new variable can be added.
Multiple new variables - Opens the Multi items adding window, where any number of variables can be added.
Opens the Variable window, where the marked variable can be edited.
Deletes the selected variables.
Moves the selected variable upwards in the list.
Moves the selected variable downwards in the list.
Opens window for text search.
Opens menu with additional options.
Export to XML file - see Data export to the XML text file. Various export types to the XML file are described in Import/Export in the editor of Pma objects.
Export to CSV file - see Data export to CSV text file
Import from XML file - see Data import from XML text file
Import from CSV file - see Data import from CSV text file
Import from OPC server - This item is available only in the PmaOpcClientGroup object. Opens the "Browsing the OPC server address space" window. On the selected level, it is possible to select multiple variables (by using the Ctrl, or Shift key), that are then added into this page.
Sort - If sorts variables in the alphabetical order by the variable name. The order of variables is changed. Be careful in cases when variables are accessed not by the name but by index (order).
Data extensions - Opens the List of data extensions window, displaying a list of all found data extensions (defined anywhere in the application), designed for this specific target object (see "Target object" configurator in the data extension).
Configuration items variables - basic:
See Variable
NameName of the variable (no diacritics, no spaces, must start with a letter).

This configurator sets the initial value of the property Name.

Data typeData type of a variable. This data type is preserved in the variable and written values are converted into this data type.

The exception is the Variant data type indicating that the variable preserves the last written value with its data type. Thus even an array can be stored in the variable (not allowed with the PmRtFree license).

ValueHere you can define
- the value (expression), that will be assigned to the variable after starting the application, or
- the data binding to another value.

See Value property and see Data binding configuration.

Macro expression can be used for input (it is evaluated after starting the application).

RoundingIf checked, then the value in the variable will be rounded do defined accuracy on each writing.

It is functional only for numeric data types (Double, Single, Long, Short, Byte).

See also Pm.Round.

AccuracyPositive number indicating accuracy (number of decimal or whole places) to round the number to. For example:
0.01 = rounding to hundreths
0.1 = rounding to tenths
0.5 = rounding to five tenths
1 = rounding to whole numbers
10 = rounding to tens
25 = rounding to the closest multiple of 25
NoteNote for better orientation in the project, applicable through the script interface even in the running application.

This configurator sets the initial value of the property Note.

Macro expression can be used for input (it is evaluated after starting the application).

Configuration items variables - extended by data extension ExtComm:
See Data extension configuration: ExtComm
ItemIDText address/identifier of the variable for the corresponding communication type. The address can be entered either manually or it can be selected from the selective window that can be opened by the button right from the input.

This configurator sets the initial value of the property ItemId.

Macro expression can be used for input (it is evaluated after starting the application).

Value recalculationIf checked, then the received and sent value will be recalculated by the PmValue = k/d * CommValue + q formula, where PmValue is the value in the PROMOTIC system, CommValue is the value from the communication, k,d,q are the recalculation constants defined in the configurator.

The conversion is applied also when sending the value. Then the inversion conversion is done according to the expression CommValue = d/k * (PmValue - q).

Caution: Vhen sending the value with conversion, some inaccuracy may happen and so the PmValue sent could differ from the PmValue received. For example for the conversion of PmValue = 1000 * CommValue and if CommValue is the value on 1B (Range 0-255), then when sending the PmValue=2008 the CommValue=2 is sent. If the CommValue=2 is received, then the PmValue will be 2000.

Note:
The script access to the variable on this page is enabled:
- by the Item method or
- by the Pm method with the usage of the #vars identifier
 
If the ExtComm is used, then the data need not to be defined on this page.
See also:

History:
Pm8.00.00: Created
PROMOTIC 9.0.7 SCADA system documentation - MICROSYS, spol. s r.o.

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