208 SI-Ethernet User Guide
Issue: 3
Data rate: Determines the communication speed of the network, the higher the value the more data
can be sent across the network in the same time period.
Device: A piece of equipment connected to a network, this may be any type of equipment including
repeaters, hubs, masters or slaves.
DNS: Domain Name Server. This is a server that is used to convert a URL such as
“www.controltechniques.com” to an IP address such as 129.254.254.106.
Double word: A 32 bit word, this may be signed or unsigned.
DHCP: Dynamic Host Configuration Protocol. This is a method of allocating IP settings of a node
from a central server.
Grounding: Describes the electrical safety or shielding connections for the module.
EDS File: Electronic Data Sheet file. A file which specifies the EtherNet/IP device functionality.
Ethernet address: See MAC address.
EtherNet/IP: An industrial application layer protocol for communicating to devices over Ethernet.
The EtherNet/IP protocol communicates to the drive using assembly objects.
Exception codes: An error response from Modbus.
Explicit data: See Non-cyclic data.
Firewall: A computer or piece of software that restricts connections between different ports. This
can be useful when restricting data flow between two network segments.
FTP: File Transfer Protocol. Used for transferring files.
Gateway: A device that allows devices on different subnets or networks to communicate with each
other.
Hub: A method of connecting computers together on Ethernet. An un-switched hub will repeat any
data received on one port to all ports.
HTTP: Hypertext transfer protocol. This is a document specification protocol. Commonly used in
web pages.
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