Lossary – Rockwell Automation RECOMM-ENET EtherNet/IP Communications Module User Manual
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Glossary
Glossary-1
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LOSSARY
BOOTP (Bootstrap Protocol) - Enables the module to configure
itself dynamically at boot time if the network has a BOOTP server.
The BOOTP server assigns the module a preconfigured IP address,
a subnet mask, and a gateway address; therefore, you do not have
to configure these using the parameters in the module. BOOTP can
make it easier to administer an Ethernet network. A free version of
Rockwell Software’s BOOTP Server can be accessed at:
http://www.reliance.com/prodserv/standriv/stdhome.htm.
bridge - A network device that can route messages from one
Ethernet network to another. A bridge also refers to a
communications module in a ControlLogix controller that connects
the controller to a network.
See
scanner.
CAN (Controller Area Network) - A serial bus protocol on which
DPI is based.
CIP (Control and Information Protocol) - The transport and
application layer protocol used for messaging over EtherNet/IP
networks. The Control protocol is for implicit messaging (real time
I/O). The Information protocol is for explicit messaging
(configuration, data collection, and diagnostics).
controller - Also called programmable logic controller. A solid-state
control system that has a user-programmable 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 a
central processor, input/output interface, and memory.
See also
scanner.
data rate - The speed at which data is transferred on the EtherNet/
IP network. You can set the module to a data rate of 10 Mbps full
duplex or 100 Mbps half duplex. If another device on the network
sets or auto-negotiates the data rate, you can set the module to
automatically detect the data rate.
Datalink - A type of pointer used by some SP600 drives to transfer
data to and from the controller. Datalinks allow specified parameter
value(s) to be accessed or changed without using explicit
messages. When enabled, each Datalink consumes either four
bytes or eight bytes in both the input and output image table of the
controller. The drive determines the size of Datalinks.