National Instruments BridgeVIEW 用户手册
Chapter 12
Case and Sequence Structures and the Formula Node
© National Instruments Corporation
12-15
5.
Save the VI as
Equations.vi
in the
BridgeVIEW/Activity
directory.
End of Activity 12-3.
Artificial Data Dependency
Nodes not connected by a wire can execute in any order. Nodes do not
necessarily execute in left-to-right, top-to-bottom order. A Sequence
structure is one way to control execution order when natural data
dependency does not exist.
necessarily execute in left-to-right, top-to-bottom order. A Sequence
structure is one way to control execution order when natural data
dependency does not exist.
Another way to control execution order is to create and artificial data
dependency, a condition in which the arrival of data rather than its value
triggers execution of an object. The receiver may not actually use the data
internally. The advantage of artificial dependency is that all of the nodes
are visible at one level, although, in some cases, the confusion created by
the artificial links between the nodes can be a disadvantage.
dependency, a condition in which the arrival of data rather than its value
triggers execution of an object. The receiver may not actually use the data
internally. The advantage of artificial dependency is that all of the nodes
are visible at one level, although, in some cases, the confusion created by
the artificial links between the nodes can be a disadvantage.
You can open the
Timing Template (data dep).vi
from
G Examples\General\structs.llb
to see how the
Timing
Template
has been altered to use artificial data dependency rather
than a sequence structure.