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A unique text string which identifying IEC 61850 object or its attribute (a reference). Maximum size is 64 characters.
Note: if I/O tag's address is specified as %IGNORE, such an I/O tag will be ignored.

According to the standard ISO/IEC IEC 61850-8-1 the reference is in form
<LNVariableName>$<FC>$<LNDataName>$<AttributeName> (napr. XCBR1$ST$Pos$stVal)
respectively - if subattributes are used - in form
<LNVariableName>$<FC>$<LNDataName>$<AttributeName>$<subDataAttributeName> (napr. XBCR1$ST$Pos$origin$orCat)
where:

• LNVariableName is a name of a Logical Node. The name can be arbitrary, e.g. LLN0, Obj1XCBR1, Obj2XSWI1
• FC is a Functional Constraint. Table of defined functional constraints can be seen below.
• LNDataName is a name of a Data Object. The name can be arbitrary, the standard contains recommended rules concerning naming conventions.
• AttributeName is a name of a Data Object Attribute. Table of frequently used attributes can be seen below.
• subDataAttributeName jis a name of a Data Object Subattribute.

The standard defines following naming conventions for individual components of a reference:

Defined Functional Constraints according to ISO/IEC IEC 61850-8-1:

Names of Data Object Attributes are defined in ISO/IEC IEC 61850-7-3 and following table contains only the most common ones:

Data Type

The list of permitted data types:

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For the Structure object type: it is possible to specify offset where IEC 61850 Quality is located. Offset defines a position relative to position of value given by a complex address. Offset 1 means that the IEC 61850 Quality is located directly after the value, offset -1 means that the quality is located directly before the value.
IEC 61850 Quality is of Bitstring type with length of 2 bytes. 13 quality bits are defined as follows (the standard numbers the bits so that the highest bit is 0 and the lowest is 15):

If at least one of bits number 2-12 is set, value in D2000 has a Weak attribute.
See the example in Time Offset. 

For the Structure object type: it is possible to specify offset where timestamp is located. Offset defines a position relative to position of value given by a complex address. Offset 1 means that the timestamp is located directly after the value, offset -1 means that the timestamp is located directly before the value.

If the Time Offset is not defined (or is equal to 0), the timestamp of the information report (for I/O Tag Type=Buffered/unbuffered report value) or the current time (for  I/O Tag Type=Periodically polled value) will be used.

Example: information report contains a structure which contains a Bitstring value followed by qualit and timestamp. Therefore the object's address has Array Index = 0, Quality Offset = 1 and Time Offset = 2.

Integrity Period

This parameter is enabled for the I/O tags of "Buffered / Unbuffered Report" type and it specifies a period (in ms) after which a report containing the values of all objects in the given datasheet is generated. Therefore, if a loss of value has occurred in some way, this Integrity Report will periodically restore the integrity of the data. Value 0 turns off the generation of Integrity Report. The non-zero value causes a write to the $IntgPd report attribute during the report activation  . 
Note: Not all IEC 61850 servers support this parameter.

For the I/O tags, it is possible to find a list of objects and their data types, as long as the KOM process is running and communication is established. 
When a Browse button is clicked, the IEC61850 Browser window opens, and the KOM process begins to query the list of objects with the GetNameList-Request message and then their data types with the GetVariableAccessAttributes-Request message.

Img. no. 3, the IEC 61850 Item Browser window

Image Modified

Meaning of individual choices and buttons:

Auto

If this choice is active, the Data Type will be set to Autodetect, otherwise to value discovered during browsing , e.g. Boolean or Integer32.

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