Omron SYSMAC LINK C1000H-SLK21-V1 System Manual page 161

Link System
Link Unit
local area network
loop connection
loop-back
MONITOR mode
most-significant (bit/word)
Multilevel PC Link System
Multilink PC Link System
Multilevel SYSMAC LINK
System
Network
network interrupt
Network Service Board
node
noise interference
nonfatal error
NSB
NSU
OFF
Glossary
A system that includes one or more of the following systems: SYSMAC LINK
System, Remote I/O System, PC Link System, Host Link System, or NET
Link System.
Any of the Units used to connect a PC to a Link System. These are SYSMAC
LINK Units, Remote I/O Units, I/O Link Units, PC Link Units, Host Link Units,
and NET Link Units.
A network consisting of nodes or positions in a loop arrangement. Each node
can be any one of a number of devices. This kind of network usually operates
over a small area such as a group of offices or a factory floor.
A method for connecting communications lines in which each Unit is connected
to two other Unit to form a closed loop.
The processes of using an alternate communications path that runs in the
reverse direction of the normal communications path to prevent communica-
tions from being disabled when communications along the normal path are not
possible.
A mode of PC operation in which normal program execution is possible, and
which allows modification of data held in memory. Used for monitoring or debug-
ging the PC.
See leftmost (bit/word).
A PC Link System in which at least one PC has two PC Link Units mounted
to it.
A PC Link System in which more than two PCs share a common data area.
A SYSMAC LINK System in which at least one PC has two PC Link Units
mounted to it.
See SYSMAC LINK Network.
An interrupt that occurs when data is received on the network interface.
A device with an interface to connect devices other than PCs to a SYSMAC NET
Link System.
One of the positions in a LAN. Each node incorporates a device that can commu-
nicate with the devices at all of the other nodes. The device at a node is identified
by the node address.
Disturbances in signals caused by electrical noise.
A hardware or software error that produces a warning but does not stop the PC
from operating.
An acronym for Network Service Board.
An acronym for Network Service Unit.
The status of an input or output when a signal is said not to be present. The OFF
state is generally represented by a low voltage or by non-conductivity, but can be
defined as the opposite of either.
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