Rockwell Automation 57C570 AutoMax PC3000 User Manual - Manual (Page 281)

HĆ1
Appendix H
Glossary of Terms
1/2Ćslot addressing: a mode of addressing in which each half I/O module of an
I/O chassis is addressed as an I/O group. Each I/O module slot contains two I/O
groups.
1Ćslot addressing: a mode of addressing in which each I/O module slot of an
I/O chassis is addressed as an I/O group. Each I/O module slot contains a single
I/O group.
2Ćslot addressing: a mode of addressing in which each even/odd pair of an I/O
module slots of an I/O chassis is addressed as an I/O group. Each I/O module
slot contains half of an I/O group.
ABR: AllenĆBradley Remote I/O Interface. Controls AllenĆBradley remote I/O by
configuring and programming this remote I/O scanner.
AĆB remote I/O: AllenĆBradley I/O being controlled by the PC3000's AĆB
Remote I/O scanner.
attenuation: signal reduction inherent in a transmission line or cable over a
given distance. The amount of loss is usually stated in decibels per kilometer at
a specific wavelength.
bend loss: increased attenuation caused by bending a fiber cable at a radius
smaller than the recommended bend radius.
bend radius, minimum: radius to which a fiber cable can be bent without
damaging the cable.
block data: a set of words or bytes handled as a unit, but not addressable as a
unit as with a file. A block is typically defined by the number of words in length
and starting word address within a file.
blockĆtransfer: to transfer a block (64 words maximum) of data to or from an
I/O module in one scan.
blockĆtransfer read: to transfer a block of data from an I/O module.
blockĆtransfer write: to transfer a block of data to an I/O module.
BNC series: a radio frequency (RF) quick connect/disconnect connector
covered by Military Specification.
braid: a weave of metal fibers used as a shield covering for an insulated
conductor or a group of insulated conductors.
breakout cable: a tightlyĆbuffered multifiber fiberĆoptic cable.
buffer: the coating immediately surrounding an individual optical fiber. It is
used for mechanical protection of the fiber.
cladding: the glass or plastic outer coating of an optical fiber that surrounds the
core and keeps the light within the fiber. It is usually described by its diameter.
coaxial cable: a cylindrical transmission line comprised of a center conductor,
a dielectric material, a shield (or an outer conductor), and usually covered by an
insulating jacket.
conduit: a pipe, tube, or tile for routing and protecting electrical wires or cables.
connector: a coupling device designed to connect conductors from one circuit
with those from another circuit.