Rockwell Automation 1784-PCC ControlNet Communication Card Installation Instructions User Manual
Page 98
2 Glossary
Publication 1784-IN034D-EN-P - June 2002
maximum unscheduled node
The node with highest network address that can be unscheduled time on a
ControlNet link.
Network Access Port (NAP)
In a ControlNet network, NAP is a physical layer variant that allows a temporary
node to be connected to the link by connection to the NAP of permanent node. It is
an RJ45 connection between two cnet devices that is typically temporary between a
programming device and the network.
network
A series of nodes connected by some type of communication medium. The
connection paths between any pair of nodes can include repeaters, routers, bridges,
and gateways.
network address
A node’s address on the network.
node
The port of a physical device connected to the network that requires a network
address to function on the network. A link may contain a maximum of 99 nodes.
NUI (Network Update Interval)
A single occurrence of the network update time (NUT).
NUT (Network Update Time)
Repetitive time interval in which data can be sent on the ControlNet network.
PC card
Credit-card size, 68-pin add-in cards that were designed to meet PCMCIA standards.
redundant media
A dual cable system that lets you receive the best signal over a network.
repeater
A two-part active physical-layer device that reconstructs and retransmits all traffic it
hears on one segment to another segment.