166
Glossary
data link area
A common data area established through a data link.
data link table
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.
data register
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.
data sharing
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.
data transfer
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.
debug
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.
decimal
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.
decrement
Decreasing a numeric value, usually by 1.
default
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.
delimiter
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
.
destination
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.
digit
A unit of storage in memory that consists of four bits.
DIP switch
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.
distributed control
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.
DM Area
A data area used to hold only word data. Words in the DM area cannot be ac-
cessed bit by bit.
DM word
A word in the DM Area.
downloading
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.
Summary of Contents for CS1W-SLK11-21 - 06-2004
Page 1: ...Cat No W367 E1 02 SYSMAC CS1W SLK11 21 SYSMAC LINK Units...
Page 2: ...CS1W SLK11 21 SYSMAC LINK Units Operation Manual Revised June 2004...
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