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A-4 TCP/IP Ethernet Communications for the Series 90™ PLC User's Manual
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May 2002 GFK-1541B
A
Frame A data structure that consists of fields, predetermined by a protocol, for the transmission
of user data and control data.
Gateway A special purpose, dedicated computer that attaches to two or more (sub)networks and
routes packets from one to the other. In particular, an Internet gateway routes IP datagrams
among the networks to which it connects. Gateways route packets to other gateways until
they can be delivered to the final destination directly across the physical (sub)network. (Also
sometimes referred to as a router.) A gateway or router connects network nodes at the
Network Layer, ISO layer 3.
Global Address Administration Address administration in which all LAN individual addresses
are unique within the same or other Local Area Networks. (See also Local Address
Administration.)
Global Data See Ethernet Global Data.
Group Address An IP multicast address that identifies a group of network nodes on a Local
Area Network.
Host A computer or workstation that communicates with stations such as PLCs or CNCs across
a network, especially one that performs supervisory or control functions. Note that this same
term is widely used in TCP/IP literature to refer to any network node that can be a source or
destination for network messages. (See also Hostid.)
Host Group A group IP address used to receive multicast IP messages from the network. Host
Group addresses must be valid Class D (multicast) IP addresses.
Hostid The hostid is the part of the IP address identifying the host on the network. (See also
Netid.)
Hub See Repeater
IEEE 802 The IEEE 802 LAN series of standards are as follows:
IEEE 802 Overview and Architecture.
IEEE 802.2 The Logical Link Control (LLC) sublayer of OSI Data Link Layer common above
all IEEE 802 Medium Access Control (MAC) sublayers.
IEEE 802.3 CSMA/CD (Ethernet) MAC and Physical Layer standard.
IEEE 802.4 Token Bus (MAP LANs) MAC and Physical Layer standard.
IEEE 802.5 Token Ring (IBM) MAC and Physical Layer standard.
Information Field That part of a protocol data unit (PDU) that contains data, as opposed to the
address field and command field.
Initiating Station The station from which an instance of communication (a transaction)
originates. Also referred to as “client”.
Interface Shortened form for “Ethernet Interface”. The general term used in this manual to
identify the GE Fanuc hardware module, with or without software, that connects a PLC (or
CNC) to a network. (See also
LAN Interface.)
Internet Address A unique Internet address identifies each node on an IP network (or system
of connected networks). The Internet address is assigned to the node by the user. (Also
known as an IP address.) (See also Physical Address.)
Internet Control Message Protocol (ICMP) The Internet standard protocol that handles error
and control messages.