National Instruments BridgeVIEW 用户手册
Appendix A
HMI Function Reference
© National Instruments Corporation
A-83
Get Tag Range and Units
Use the Get Tag Range and Units VI to obtain the engineering range for the tag in a cluster
of Minimum, Maximum, and Increment. You can wire this format to a scale attribute node
for a graph, slide, or vessel. Increment is set to 0, which means that BridgeVIEW calculates
the scale increment automatically. units is the tag engineering units.
of Minimum, Maximum, and Increment. You can wire this format to a scale attribute node
for a graph, slide, or vessel. Increment is set to 0, which means that BridgeVIEW calculates
the scale increment automatically. units is the tag engineering units.
tag name is the name of the tag about which you want to obtain
information.
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
executes. For more information about this control, see the section
in this appendix.
eng range is the range of the tag in engineering units. If you are plotting
data on a chart, waveform graph, XY graph, slide or vessel, you can wire
this output directly to the X Range (All Elements) or Y Range (All
Elements) Attribute Node.
data on a chart, waveform graph, XY graph, slide or vessel, you can wire
this output directly to the X Range (All Elements) or Y Range (All
Elements) Attribute Node.
Minimum is the user defined minimum tag value.
Maximum is the user defined maximum tag value.
Increment is the delta in which the value increments. It is not a
user defined value and is always 0. Increment determines how
the chart or graph computes an increment based on the Minimum,
Maximum, and the data set being plotted.
user defined value and is always 0. Increment determines how
the chart or graph computes an increment based on the Minimum,
Maximum, and the data set being plotted.
units is the name of units for engineering values. This parameter applies
to analog tags only. For discrete, bit array, and string tags, units is an
empty string.
to analog tags only. For discrete, bit array, and string tags, units is an
empty string.
error out is a cluster that describes the error status after this VI executes.
For more information about this indicator, see the section
For more information about this indicator, see the section
in this appendix.