Appendix A
HMI Function Reference
A-80
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National Instruments Corporation
Get Tag I/O Connection Info
Use the Get Tag I/O Connection Info VI to obtain information on how the tag is connected to
a real-world I/O point. Outputs include data type (analog, discrete, bit array, or string), server,
I/O group, item, access rights (Memory, Input, Output, I/O), and length. For bit array tags,
length is the number of discrete points in the tag. For string tags, length is the number of bytes.
This output is not used for analog and discrete tags.
tag name is the name of the tag about which you want to obtain
information.
error in (no error) is a cluster that describes the error status before this VI
executes. For more information about this control, see the section
Not Reported by the BridgeVIEW Engine
in this appendix.
data type is the tag type (analog, discrete, string, or bit array).
server indicates the device server used for this tag. It is not applicable for
memory tags, which have no servers associated with them by definition.
I/O group is the name of the I/O group the item is used with.
item is the channel, register, or item name.
error out is a cluster that describes the error status after this VI executes.
For more information about this indicator, see the section
Reported by the BridgeVIEW Engine
in this appendix.
access rights indicates whether the tag is a Memory, Input, Output, or
Input/Output tag.
length is the maximum length for the tag. This field is applicable to bit
array and string tags only. It is not used for analog or discrete tags.
