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Glossary
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National Instruments Corporation
G-11
NI-FBUS Hardware and Software User Manual
Trend
A Fieldbus object that allows a device to sample a process variable
periodically, then transmit a history of the values on the network.
Trend function
An NI-FBUS call related to trends.
U
USB
Universal Serial Bus.
USB-8486
NI USB-8486 F
OUNDATION
™
Fieldbus interface.
V
VCR
See
Virtual Communication Relationship.
VFD
See
View objects
Predefined groupings of parameter sets that HMI applications use.
Virtual Communication
Relationship
Preconfigured or negotiated connections between virtual field
devices on a network.
Virtual Field Device
The virtual field device is a model for remotely viewing data
described in the object dictionary. The services provided by the
Fieldbus Messaging Specification allow you to read and write
information about the object dictionary, read and write the data
variables described in the object dictionary, and perform other
activities such as uploading/downloading data and invoking
programs inside a device. A model for remotely viewing data
described in the object dictionary.
W
Waveform
Multiple voltage readings taken at a specific sampling rate.