Chapter 3
Tag Configuration
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National Instruments Corporation
3-35
Discrete Tags
Discrete tags have one alarm state—either the tag is in alarm or it is not.
You can determine whether a tag is in alarm when it is ON (High) or
OFF (Low). Figure 3-12 shows the Alarms tab of the Discrete Tag
Configuration dialog box.
Figure 3-12.
Alarms for Discrete Tag Configuration
Bit Array Tags
You can enable one of two types of alarms for bit array tags. Alarm on
Any indicates the overall tag is in alarm if any of the bits are in alarm state.
Alarm on All means the overall tag is in alarm only if all of the bits are in
alarm state. You can use the Invert Mask to determine the bits that should
use alarm on low (OFF) rather than the default alarm on high (ON).
You can use the Select (AND) Mask to determine the bits that should
be considered for the alarm. If you have bits in the Select Mask that are
zero (OFF), these bits are not used in calculation of the tag alarm state.
Figure 3-13 shows the Alarms tab of the Bit Array Tag Configuration
dialog box.
