D-6
Series 90™-30 PLC LONWORKS® Bus Interface Module User's Manual
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June 1997
GFK-1322A
D
Internet Control Message Protocol
(ICMP)
The Internet Protocol that handles error and control messages.
Internet Protocol (IP)
The Internet standard protocol that defines the Internet datagram and
provides the basis for the Internet packet delivery service. See also
Transmission Control Protocol (TCP).
Inter Repeater Link (IRL)
A mechanism for interconnecting two and only two repeater units.
IP Address
See Internet Address.
Jabber
A transmission by a network node beyond the time interval allowed
by the protocol.
LAN Interface
A term used in this manual to identify the GEnet hardware module,
with or without software, that connects a PLC or CNC to a network.
LAN Interface Status Bits (LIS Bits)
The LIS bits comprise bits 1–16 of an 80-bit status bit area. The
location of this 80-bit status area is assigned using the Logicmaster
90 Configuration Package in the “Status Address” field. The LIS bits
contain information on the status of the Local Area Network (LAN)
and the Ethernet Interface itself.
Linear Topology
A network topology in which nodes are each connected at a point
along a common continuous cable which has no loops and only two
endpoints.
Link Service Access Point (LSAP)
A Data Link layer SAP. A single byte that identifies the routing of
data received by the network node.
LIS Bits
See LAN Interface Status Bits.
Local Address Administration
Address administration in which all LAN individual addresses are
unique within the same Local Area Network. (See also, Global
Address Administration.)
Local Area Network (LAN)
A computer network located on a user’s premises within a limited
geographical area.
Local Station
The station at your immediate location, i.e.,
“here”. (See also
“Remote Station”).
Log Events
Events recorded in the system exception log for the LAN Interface.
The maximum number of events in the exception log is 16.
Logical Link Control (LLC)
Protocol
In a Local Area Network, the protocol that governs the exchange of
frames between network nodes independently of how the
transmission medium is shared.
MAC Address
The Medium Access Control (MAC) address is a 12-digit
hexadecimal number that identifies a node on a local network. Each
Ethernet Interface has its own unique MAC address.
Medium Access Control (MAC)
In a local area network (LAN), the part of the protocol that governs
access to the transmission medium independently of the physical
characteristics of the medium, but taking into account the topological
aspects of the network, in order to enable the exchange of data
between network nodes.
Medium Access Control Protocol
In a Local Area Network, the protocol that governs access to the
transmission medium, taking into account the topological aspects of
the network, to enable the exchange of data between network nodes.
Medium Attachment Unit (MAU)
In a network node on a Local Area Network, a device used to couple
the data terminal equipment (DTE) to the transmission medium.
Often called “transceiver”. The MAU may be built into the DTE or it
may be a separate unit that attaches to the DTE through an AUI.
Multicast Address
A LAN group address that identifies a subset of the network nodes
on a Local Area Network.
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