Installation guide

Glossary
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packet to the Physical Layer for transmission. Its two logical
entities are the MAC and LLC sublayers. See MAC and LLC .
DIO
See Distributed I /O.
DIO Drop Adapter
See DIO Adapter .
Distributed I/O
A Modbus Plus network that consists of hardware components
that are specifically designed for high-speed control of
Input/Output devices at remote sites in an industrial process.
Each DIO network has one Programmable Controller or one
Modbus Plus Network Option Module that operates as the master
controlling node on the network. The DIO network also has one or
more DIO Adapters, placed at the remote plant sites. Up to 64
nodes can be present on each DIO network, exchanging messages
during the passing of token frames.
download
The transfer of a program from one device to another for
execution.
drop cable
A cable used to connect a networked node device to a tap on the
trunk cable. Drop cables are available in various lengths from
Modicon. See tap.
duplicate frame
A frame received twice because an acknowledgement was lost.
end delimiter
A field that defines the end of a message.
EIA
Electronic Industries Association.
field
A logical grouping of contiguous bits that convey one kind of
information, such as the start or end of a message, an address,
data, or an error check.
frame
A logical grouping of contiguous bits for transmission; a message.
frame check sequence