Rockwell Automation 1771ACN/B_1771ACNR/B,D17716.5.123 U.MNL CONTROLNET ADAPTER - Manual (Page 4)

Using This Manual P–2
Publication 1771-6.5.123 – May 1996
The following list defines common terms used in this manual.
Use this term To describe
complementary module
a module that performs an opposite function; an input module complements an output
module and vice versa
Configuration Manager node node responsible for distributing ControlNet configuration data to all nodes on the
network
ControlNet network a communication architecture that allows the exchange of messages between
Allen-Bradley Company, Inc. products and certified third-party products
connection an opened communication path between two nodes on a ControlNet network
ControlNet status indicators channel A and channel B indicators on your node indicating status on the ControlNet
link
DF1 protocol a peer-to-peer link-layer protocol that combines features of ANSI X3.28-1976
specification subcategories D1 (data transparency) and F1 (two-way simultaneous
transmission with embedded responses)
DH+

network
(Data Highway Plus

)
an Allen-Bradley local area network made up of one or more token-passing baseband
links
discrete I/O data transfer type of data transfer in which single units of I/O have discrete relationships with values
in the processor’s data table; uses the processor’s input- and output-image tables
(I and O files); configured on a per-node basis in the ControlNet I/O map table
drop cable a cable that connects a node to the trunk cable (this is an integral part of
1786 taps)
frame single data transfer on a ControlNet link
half–slot addressing a method of addressing where the processor can address its I/O in 1/2–slot I/O groups
high–density i/o module a module that provides 16 input or 16 output terminals
I/O Group an addressing unit that can contain up to 16 input terminals and 16 output terminals
I/O map table table that you configure using the programming software to map data from an I/O
chassis and other devices on the ControlNet network to particular data-table file
addresses
link collection of nodes with unique addresses (in the range of 1-99). Segments
connected by repeaters make up a link; links connected by bridges make up a network
map-table entry one entry in the I/O map table that you configure using the programming software to
map data from one I/O chassis (or other device on a ControlNet link) to particular
data-table file addresses
maximum scheduled node node with highest network address that can use scheduled time on a ControlNet link
maximum unscheduled node node with highest network address that can use unscheduled time on a ControlNet link
network access port (NAP) port that provides a temporary network connection through an RJ-45 connector
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 (this replaces MAC ID and node address).
node port of a physical device connecting to the network which requires a network address
in order to function on the network — a link may contain a maximum of 107 nodes
network update interval (NUI) single occurrence of the network update time (NUT)
network update time (NUT) repetitive time interval in which data can be sent on the ControlNet network
non-discrete I/O data transfer type of data transfer in which blocks of data transferred to or from I/O modules use
integer input and output data-table files that you specify; cannot use the processor’s
input- and output-image tables (I and O files); scheduled transfers are configured in
the ControlNet I/O map table, unscheduled transfers make use of ControlNet I/O (CIO)
transfer instructions
one–slot addressing A method of addressing where the processor can address its I/O in 1–slot I/O groups.
parallel port an input/output port for a device that transmits multiple data and control bits over wires
connected in parallel
PC An Allen–Bradley programmable controller, such as the PLC–5
PCCC Programmable Controller Communication Commands, an application-level command
set that Allen-Bradley programmable controllers use to communicate across networks
processor a term used to mean an Allen–Bradley programmable controller
quad–density i/o module a module that provides 32 input or 32 output terminals
redundant media dual cable system that allows you to receive the best signal over a network
Terminology Used in This
Manual