Glossary - Omron CQM1H - 08-2005 Operation Manual

*DM
1:1 link
ACP
add count input
address
AND
area
area prefix
arithmetic shift
ASCII
AR Area
AUTOEXEC.BAT
back-up
basic instruction
baud rate
BCD
BCD calculation
binary
binary calculation
binary-coded decimal
bit
bit address

Glossary

Indirectly addressed DM area. See indirect address and DM area.
A link created between two PCs to create common data in their LR areas.
See add count input.
An input signal used to increment a counter when the signal changes from
OFF to ON.
A number used to identify the location of data or programming instructions
in memory.
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 conditions.
See data area and memory area.
A one or two letter prefix used to identify a memory area in the PC. All
memory areas except the IR and SR areas require prefixes to identify
addresses in them.
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 PC data area allocated to flags and control bits.
An MS DOS file containing commands automatically executed at startup.
A copy made of existing data to ensure that the data will not be lost even if
the original data is corrupted or erased.
A fundamental instruction used in a ladder diagram.
The data transmission speed between two devices in a system measured
in bits per second.
See binary-coded decimal.
An arithmetic calculation that uses numbers expressed in binary-coded
decimal.
A number system where all numbers are expressed in base 2, i.e., numbers
are written using only 0's and 1's. Each group of four binary bits is equivalent
to one hexadecimal digit. Binary data in memory is thus often expressed in
hexadecimal for convenience.
An arithmetic calculation that uses numbers expressed in binary.
A system used to represent numbers so that every four binary bits is
numerically equivalent to one decimal digit.
The smallest piece of information that can be represented on a computer.
A bit has the value of either zero or one, corresponding to the electrical
signals ON and OFF. A bit represents one binary digit. Some bits at particular
addresses are allocated to special purposes, such as holding the status of
input from external devices, while other bits are available for general use in
programming.
The location in memory where a bit of data is stored. A bit address specifies
the data area and word that is being addressed as well as the number of the
bit within the word.
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