Glossary - Omron SYSMAC C2000H Operation Manual

address
allocation
AND
APF
AR area
arithmetic shift
ASCII
ASCII Unit
Backplane
BCD
BCD calculation
binary
binary calculation
binary-coded decimal
bit

Glossary

The location in memory where data is stored. For data areas, an address
consists of a two-letter data area designation and a number that designates
the word and/or bit location. For the UM area, an address designates the in-
struction location (UM area). In the FM area, the address designates the
block location, etc.
The process by which the PC assigns certain bits or words in memory for
various functions. This includes pairing I/O bits to I/O points on Units.
A logic operation whereby the result is true if and only if both premises are
true. In ladder-diagram programming the premises are usually ON/OFF
states of bits or the logical combination of such states called execution condi-
tions.
Acronym for all plastic fiber-optic cable.
A PC data area allocated to flags, control bits, and work bits.
A shift operation wherein the carry flag is included in the shift.
Short for American Standard Code for Information Interchange. ASCII is
used to code characters for output to printers and other external devices.
A Special I/O Unit used to program in BASIC. When connected to an NSU on
a SYSMAC NET Link System, commands can be sent to other nodes.
A base onto which Units are mounted to form a Rack. Backplanes provide a
series of connectors for these Units along with wiring to connect them to the
CPU. Backplanes also provide connectors used to connect them to other
Backplanes. In some Systems, different Backplanes are used for different
Racks; in other Systems, Racks differ only according to the Units mounted to
them.
Short for binary-coded decimal.
An arithmetic calculation that uses numbers expressed in binary-coded deci-
mal.
A number system where all numbers are expressed to the base 2, i.e., any
number can be written using only 1's or 2's. Each group of four binary bits is
equivalent to one hexadecimal digit.
An arithmetic calculation that uses numbers expressed in binary.
A system used to represent numbers so that each group of four binary bits is
numerically equivalent to one decimal digit.
A binary digit; hence a unit of data in binary notation. The smallest unit of
information that can be electronically stored in a PC. The status of a bit is
either ON or OFF. Different bits at particular addresses are allocated to spe-
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