Omron SYSMAC C200HW-PCS01-EV1, Operation Manual

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Glossary
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CTS An acronym for clear-to-send, a signal used in communications between elec-
tronic devices to indicate that the receiver is ready to accept incoming data.
CV Support Software A programming package run on an IBM PC/AT or compatible to serve as a Pro-
gramming Device for CV-series PCs.
CV-series PC Any of the following PCs: CV500, CV1000, CV2000, or CVM1
CVSS See CV Support Software.
cycle One unit of processing performed by the CPU, including SFC/ladder program
execution, peripheral servicing, I/O refreshing, etc. The cycle is called the scan
with C-series PCs.
data area An area in the PC’s memory that is designed to hold a specific type of data.
data length In communications, the number of bits that is to be treated as one unit in data
transmissions.
data transfer Moving data from one memory location to another, either within the same device
or between different devices connected via a communications line or network.
datagram A unit of data used in network communications.
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-tuning
of timing and coordination of control operations.
decimal A number system where numbers are expressed to the base 10. In a PC all data
is ultimately stored in binary form, four binary bits are often used to represent
one decimal digit, via a system called binary-coded decimal.
default A value automatically set by the PC when the user does not specifically set
another value. Many devices will assume such default conditions upon the
application 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 terminator.
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.
DIP switch Dual in-line package switch, an array of pins in a signal package that is mounted
to a circuit board and is used to set operating parameters.
DM Area A data area used to hold only word data. Words in the DM area cannot be
accessed bit by bit.
DM word A word in the DM Area.
echo test A test executed by sending an FINS command between two nodes on commu-
nications networks and used to determine if communications are normal.
EEPROM Electrically erasable programmable read-only memory; a type of ROM in which
stored data can be erased and reprogrammed. This is accomplished using a
special control lead connected to the EEPROM chip and can be done without
having to remove the EEPROM chip from the device in which it is mounted.