Omron CS1W-SLK11-21 - 06-2004 Manual page 183

data link area
data link table
data register
data sharing
data transfer
debug
decimal
decrement
default
delimiter
destination
digit
DIP switch
distributed control
DM Area
DM word
downloading
166
Glossary
A common data area established through a data link.
A table of settings kept in memory that specifies what words are to be part of
a data link for all PLCs involved in the link.
A storage location in memory used to hold data. In CV-series PLCs, data reg-
isters are used with or without index registers to hold data used in indirect ad-
dressing.
An aspect of SYSMAC Link Systems and SYSMAC NET Link Systems in
which common data areas or common data words are created between two or
more PLCs.
Moving data from one memory location to another, either within the same de-
vice or between different devices connected via a communications line or net-
work.
A process by which a draft program is corrected until it operates as intended.
Debugging includes both the removal of syntax errors, as well as the fine-tun-
ing of timing and coordination of control operations.
A number system where numbers are expressed to the base 10. In a PLC all
data is ultimately stored in binary form, four binary bits are often used to rep-
resent one decimal digit, via a system called binary-coded decimal.
Decreasing a numeric value, usually by 1.
A value automatically set by the PLC when the user does not specifically set
another value. Many devices will assume such default conditions upon the ap-
plication of power.
A code sent during communications between devices to indicate the end of the
current transmission, but not the end of the entire transmission. See termina-
tor.
The location where an instruction places the data on which it is operating, as
opposed to the location from which data is taken for use in the instruction. The
location from which data is taken is called the source.
A unit of storage in memory that consists of four bits.
Dual in-line package switch, an array of pins in a signal package that is mount-
ed to a circuit board and is used to set operating parameters.
A automation concept in which control of each portion of an automated system
is located near the devices actually being controlled, i.e., control is decentral-
ized and 'distributed' over the system. Distributed control is a concept basic to
PLC Systems.
A data area used to hold only word data. Words in the DM area cannot be ac-
cessed bit by bit.
A word in the DM Area.
The process of transferring a program or data from a higher-level or host com-
puter to a lower-level or slave computer. If a Programming Device is involved,
the Programming Device is considered the host computer.