National Instruments FP-3000 - Manual (Page 135)

Glossary
© National Instruments Corporation Glossary-3 FieldPoint FP-3000 User Manual
Contained parameter A parameter that does not receive or send data and is contained within
a function block.
Control loop A set of connections between blocks used to perform a control
algorithm.
Control strategy See function block application.
Controller An intelligent device (usually involving a CPU) that is capable of
controlling other devices.
Current The flow of electrons through a conductor.
D
DC Direct Current.
DD See Device Description.
Descriptor A number returned to the application by the NI-FBUS
Communications Manager, used to specify a target for future
NI-FBUS calls.
Device A sensor, actuator, or control equipment attached to the Fieldbus.
Device Description A machine-readable description of all the blocks and block
parameters of a device.
Device ID An identifier for a device that the manufacturer assigns. No two
devices can have the same device ID.
Device tag A name you assign to a Fieldbus device.
DI Discrete Input.
Digital Pertaining to data (signals) in the form of discrete (separate/pulse
form) integral values.
Directory A structure for organizing files into convenient groups. A directory is
like an address showing where files are located. A directory can
contain files or subdirectories of files.
Distributed control Process control distributed among several devices connected by
network.
DO Discrete Output.