Glossary
© National Instruments Corporation G-7 FBUS-HSE/H1 LD User Manual
sensor A device that responds to a physical stimulus (heat, light, sound, pressure,
motion, flow, and so on), and produces a corresponding electrical signal.
server Device that receives a message request.
service A service allows user applications to send messages to each other across
Fieldbus using a standard set of message formats.
T
tag A name you can define for a block, virtual field device, or device.
terminator A device used to absorb the signal at the end of a wire.
timeout A period of time after which an error condition is raised if some event has
not occurred.
U
unscheduled Messages sent on the Fieldbus between transmissions of scheduled
messages.
upstream Fewer network hops away from a backbone or hub. For example, a small
ISP connects to the Internet through a larger ISP that has its own connection
to the backbone and is downstream from the larger ISP. The larger ISP is
considered to be upstream from the smaller ISP.
V
V Volts.
VDC Volts direct current.
VFD See virtual field device.
virtual field device 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 is described in the
object dictionary.