National Instruments BridgeVIEW, User Manual

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Chapter 3 Tag Configuration
© National Instruments Corporation 3-33 BridgeVIEW User Manual
Alarm on discrete,
bit array Determines whether a discrete tag should be alarm on ON (high)
or OFF (low). Determines whether a bit array goes into alarm if
all of its bits are in alarm or if any of its bits are in alarm. This
field is used only if both Alarms Enabled and Discrete Enabled
fields are set to TRUE.
Discrete
Priority discrete,
bit array Determines the value (between 1 and 15) for the alarm priority
for the tag value alarm, where 15 represents the highest priority.
Alarm Invert
Mask bit array Determines which bits are inverted before calculating the
alarm state. Bits in the mask that are
1
are inverted; thus cause
an alarm when low (0). Bits that are
0
are not inverted; thus,
cause an alarm when high (1). The default mask is 0, indicating
none of the bits are inverted. In bit-wise logic terminology, the
Engine performs an XOR with the Invert Mask to produce the
alarm state. The Alarm Invert Mask is applied to the scaled value
after any relevant scaling masks are applied.
Alarm Select
Mask bit array Determines which bits are used for the bit array alarm
calculation. Bits in the mask that are
1
are used in the alarm
calculation; bits that are
0
do not cause an alarm, regardless of
their value. In bit-wise logic terminology, the Engine performs an
AND with the Select Mask to produce the alarm state. The Alarm
Select Mask is applied to the scaled value after any relevant
scaling masks are applied.
Alarm
Message discrete,
bit array Determines the string used to provide additional information
about the meaning of an alarm condition.
Tag Last
Modified all Indicates when the last edit to a tag occurred.
Table 3-7. Alarms Configuration Attributes (Continued)
Attribute
Applies to
Data Types Description