Rockwell Automation Flex/WebPak 3000 DC Drive ControlNet, Network Communication Board, 915FK2101 User Manual
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Glossary-2
ControlNet Network Communication Option Board For Use With FlexPak 3000 and WebPak 3000 DC Drives
NUT (Network Update Time) - Repetitive time interval in which data can be sent on
the ControlNet network.
redundant media - A dual cable system that lets you receive the best signal over a
network.
repeater - A two-port active physical-layer device that reconstructs and retransmits all
traffic it hears on one segment to another segment.
sheduled transfer - Deterministic and repeatable transfers that are continuous and
asynchronous to the ladder-logic program scan.
segment - Trunk-cable sections connected via taps with terminators at each end; a
segment does not include repeaters.
tap - A component that connects products to the ControlNet trunk cable. A tap is
required for each node and for both sides of each repeater.
terminator - A 75-
Ω resistor (mounted in a BNC plug) placed on the ends of
segments to prevent reflections from occurring at the ends of cables.
trunk-cable - The bus or central part of the ControlNet cable system.
trunk-cable section - The length of trunk cables between any two laps.
tunable (parameter) - A parameter that can be adjusted or changed when the drive is
running or stopped.
unscheduled transfers - Non-deterministic data transfers through ladder-initiated
communication or programming devices.