National Instruments NI-FBUS - Manual (Page 139)

Glossary
© National Instruments Corporation G-3 NI-FBUS Configurator User Manual
C
C Celsius.
Channel A pin or wire lead to which you apply or from which you read the
analog or digital signal.
Character string name See Tag .
Configuration object See Linkage .
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 .
CSV A text file using the Comma Delimited format.
Cyclic Closed-loop control.
D
Data Link Layer The second-lowest layer in the ISO seven-layer model (layer two).
The Data Link Layer splits data into frames to send on the physical
layer, receives acknowledgment frames, and retransmits frames if
they are not received correctly. It also performs error checking to
maintain a sound virtual channel to the next layer.
Data link time
synchronization A time distribution message broadcast on the Fieldbus so that all
devices have exactly the same data link time.
dB Decibel.
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 address A memory address that you use to access a device in a computer
system.
Device Description A machine-readable description of all the blocks and block
parameters of a device.