Glossary
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IOM (Area) A collective memory area containing all of the memory areas that can be ac-
cessed by bit, including timer and counter Completion Flags. The IOM Area in-
cludes all memory area memory addresses between 0000 and 0FFF.
JIS An acronym for Japanese Industrial Standards.
jump A type of programming where execution moves directly from one point in a pro-
gram to another, without sequentially executing any instructions in between.
Jumps in ladder diagrams are usually conditional on an execution condition;
jumps in SFC programs are conditional on the step status and transition condi-
tion status before the jump.
LAN An acronym for local area network.
least-significant (bit/word) See rightmost (bit/word).
LED Acronym for light-emitting diode; a device used for indicators or displays.
leftmost (bit/word) The highest numbered bits of a group of bits, generally of an entire word, or the
highest numbered words of a group of words. These bits/words are often called
most-significant bits/words.
link A hardware or software connection formed between two Units. “Link” can refer
either to a part of the physical connection between two Units or a software con-
nection created to data existing at another location (i.e., data links).
link parameter table See common link parameter table.
Link System A system used to connect remote I/O or to connect multiple PCs in a network.
Link Systems include the following: SYSMAC BUS Remote I/O Systems, SYS-
MAC BUS/2 Remote I/O Systems, SYSMAC LINK Systems, Host Link Systems,
and SYSMAC NET Link Systems.
Link Unit Any of the Units used to connect a PC to a Link System. These include Remote
I/O Units, SYSMAC LINK Units, and SYSMAC NET Link Units.
load The processes of copying data either from an external device or from a storage
area to an active portion of the system such as a display buffer. Also, an output
device connected to the PC is called a load.
local area network 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.
local network table A table that specifies all of the networks that a PC belongs to and the unit num-
bers of the Units connecting the PC to each of these networks.
master In a SYSMAC NET Link System, a Unit specified to manage network communi-
cations.
master number A number assigned to a master in a SYSMAC NET Link System. This number is
different from the unit number.
MCR Unit Magnetic Card Reader Unit.
megabyte A unit of storage equal to one million bytes.
memory area Any of the areas in the PC used to hold data or programs.
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