Omron CS1W-SLK11-21 - 06-2004 Manual page 181

binary-coded decimal
bit
bit address
Branching Link Adapter
buffer
building-block PLC
bus
bus link
byte
central processing unit
channel
character code
checksum
CIM
CIO Area
combined Link System
common (link) parameter table
164
Glossary
A system used to represent numbers so that every four binary bits is numeri-
cally 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 ex-
ternal 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.
A Link Adapter used to branch connections to Units in a Link System used ei-
ther to prevent the entire System from shutting down for an interruption at only
one point in the System, or to enable connecting more than two Units in one
System when each Unit provides only one connector.
A temporary storage space for data in a computerized device.
A PLC that is constructed from individual components, or "building blocks."
With building-block PLCs, there is no one Unit that is independently identifiable
as a PLC. The PLC is rather a functional assembly of Units.
A communications path used to pass data between any of the Units connected
to it.
A data link that passed data between two Units across a bus.
A unit of data equivalent to 8 bits, i.e., half a word.
A device that is capable of storing programs and data, and executing the in-
structions contained in the programs. In a PLC System, the central processing
unit executes the program, processes I/O signals, communicates with external
devices, etc.
See word.
A numeric (usually binary) code used to represent an alphanumeric character.
A sum transmitted with a data pack in communications. The checksum can be
recalculated from the received data to confirm that the data in the transmission
has not been corrupted.
Computer integrated manufacturing; a process where one or more computers
are used to control and integrate manufacturing processes.
A memory area used to control I/O and to store and manipulate data. CIO Area
addresses do not require prefixes.
A control system that includes more than one of the following systems: Remote
I/O System, SYSMAC Link System, Host Link System, or SYSMAC NET Link
System.
A table of settings in a SYSMAC LINK System that specifies what words are to
be used in the data links for all PLCs in the SYSMAC LINK System. See re-
fresh parameter table.