Since you suggested that those measurement values are already extracted then just use the driver to write them, similar to this:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim value1 As String = SMS_Value1
Dim value2 As String = SMS_Value2
Dim value3 As String = SMS_Value3
Dim value4 As String = SMS_Value4
EthernetIPforSLCMicroCom1.BeginWrite("N7:0", 4, New String() {value1, value2, value3, value4})
End Sub
Or simplified further:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
EthernetIPforSLCMicroCom1.BeginWrite("N7:0", 4, New String() {SMS_Value1.ToString, SMS_Value2.ToString, SMS_Value3.ToString, SMS_Value4.ToString})
End Sub
These should be integer values since N7 is integer data type.