190 SI-Ethernet User Guide
Issue: 1
Cyclic (implicit or polled) data: Data that is transmitted at regular intervals over the
network. Sometimes referred to as “Implicit data” or “Polled data”.
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.
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