
About This Manual P–3
17706.5.16 October
, 1996
Term Definition
local node The node sending the command
node The point at which devices, such as programmable controllers,
interface to the network. Each device on a network must have a
unique node address.
In some AllenBradley documentation, you may find the term station
used in place of the term node.
physical link Cable and associated hardware, such as transmitter and receiver
circuits.
PLC controller An AllenBradley programmable controller. See programmable
controller.
protocol Set of programming rules for interpreting the signals transmitted over
the physical link by nodes.
programmable
controller
a solidstate control system that has a userprogrammable memory
for storage of instructions to implement specific functions such as I/O
control, logic, timing, counting, report generation, communication,
arithmetic, and data file manipulation. A controller consists of central
processor, input/output interface, and memory. A controller is
designed as an industrial control system.
remote node The node sending the reply to the local node
Abbreviation Definition
ACK acknowledgement. In communication, ACK is a control code sent by
the receiving node to indicate that the data has been received
without error and the next part of the transmission may be sent.
DH+ Data Highway Plus. AllenBradley proprietary network protocol.
NAK negative acknowledgement.
Publication Name Publication Number
DH/DH+/DH II/DH485 Cable Installation Manual 17706.2.2
DH Overview Product Data 17702.39
DH+ Overview Product Data 17852.6
SCADA System Selection Guide AG2.1
SCADA System Application Guide AG6.5.8
Terms and Abbreviations
Related Publications
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