Gets / Sets the PLC register value

Property Value

Object value

Implements

ITag.Value

Remarks

Reading Values:

When reading from the PLC, you need to specify the DataType for the value being read.

 

Default data types for registers as follows:

%R, %AQ, %AI, %W, %BM - Int16

%M, %I, %Q, %S, %SA, %SB, %SC, %G, %T - Boolean

 

The Length property determines the number of contiguous number of PLC registers read. The .Value propery will be returned as a Array of the specified .DataType

 

Writing Values:

When setting the .Value for writing, the Type of the Object will be assigned to the PLC. See Tag.ATOMIC for supported data types.

 

Error Condition:

When an error occurs the .Value property will be returned as a null reference (Nothing in Visual Basic)  

Exceptions

Example

VB
' * reading
Dim MyPLC As New GELink.Controller("192.168.1.45")
Dim MyTag As New GELink.Tag("%R1")
' * read %R1 as System.Int16 (default)
MyPLC.ReadTag(MyTag)
Console.WriteLine(MyTag.Value.ToString())



' * read %R1 as System.Int32
MyTag.DataType = ATOMIC.INT
MyPLC.ReadTag(MyTag)
Console.WriteLine(MyTag.Value.ToString())



' * read %R1 as System.Single
MyTag.DataType = ATOMIC.REAL
MyPLC.ReadTag(MyTag)
Console.WriteLine(MyTag.Value.ToString())



' * reading %R1 as an array
MyTag.DataType = ATOMIC.INT
MyTag.Length = 100
MyPLC.ReadTag(MyTag)



' * writing System.Int16
Dim _plcValue As System.Int
_plcValue = 123
MyTag.Value = _plcValue
MyPLC.WriteTag(MyTag)



C#
// reading
GELink.Controller MyPLC = new GELink.Controller("192.168.1.45");
GELink.Tag MyTag = new GELink.Tag("%R1");


 


// read %R1 as System.Int16 (default)
MyPLC.ReadTag(MyTag);
Console.WriteLine(MyTag.Value.ToString());



// read %R1 as System.Int32
MyTag.DataType = ATOMIC.INT;
MyPLC.ReadTag(MyTag);
Console.WriteLine(MyTag.Value.ToString());



// read %R1 as System.Single
MyTag.DataType = ATOMIC.REAL;
MyPLC.ReadTag(MyTag);
Console.WriteLine(MyTag.Value.ToString());



// reading %R1 as an array
MyTag.DataType = ATOMIC.INT;
MyTag.Length = 100;
MyPLC.ReadTag(MyTag);



// writing System.Int16
System.Int16 _plcValue
_plcValue = 123;
MyTag.Value = _plcValue;
MyPLC.WriteTag(MyTag);

See Also

Tag Class | GELink Namespace | ErrorCode | ErrorString | QualityCode | QualityString

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