Item - method of the PmaTrendGroup object

The method returns object of the PmVar type that represents one variable defined on the "Data" tab.
Object Item(Variant id)
id(Variant) Specifies the variable. The value je:
- Name (String, case sensitive text, for example "d1") or
- Index (Long, zero-based index)
The PmVar object contains information about the variable (value, name, index, etc.).
If the variable does not exist, then error value (null for JavaScript or Nothing for VBScript) is returned. The global error of the INFO system is generated. For variable existence testing, it is better to use the ItemEx method.
The method returns only variables (with corresponding data extension) that are created directly in this object (own variables). In fact also other variables from PmaData objects are registered into this object - those that have corresponding data extension configured with path to this object. All data extensions registered in this object can be accessed by the GetVarExtensions method.
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var oTrend = pMe.Pm("/Trends");
var value = oTrend.Item("temperature").Value;   // Reading the value
oTrend.Item("temperature").Value = 24;   // Writing the value
PROMOTIC 9.0.25 SCADA system documentation MICROSYS, spol. s r.o.

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