Glossary - Omron SYSMAC C500 Installation Manual

Backplane
back-up
bit
central processing unit
communication cable
Control System
CPU
CPU Backplane
CPU Rack
data area
data link
distributed control
EEPROM
EPROM
Expansion I/O Unit
factory computer
High-speed Counter

Glossary

A base to which Units are mounted to form a Rack. Backplanes provide a
series of connectors for these Units along with wiring to connect them to the
CPU and Power Supply. Backplanes also provide connectors used to
connect them to other Backplanes. In some Systems, different Backplanes
are used for different Racks; in other Systems, Racks differ only by the Units
mounted to them.
A copy of existing data which is valuable if data is accidentally erased.
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 is one binary digit.
A device that is capable of storing a program and data, and executing the set
of instructions contained in the program. In a PC System, the central
processing unit executes the program, processes I/O signals, communicates
with external devices, etc.
Cable used to transfer data between components of a control system and
conforming to the RS-232C or RS-422 standards.
All of the hardware and software components used to control other devices.
A Control System includes the PC System, the PC programs, and all I/O
devices that are used to control or obtain feedback from the controlled
system.
An acronym for central processing unit.
A Backplane used to create a CPU Rack.
Part of a Rack PC, the CPU Rack contains the CPU, a Power Supply, and
other Units.
An area in the PC's memory that is designed to hold a specific type of data,
e.g., the LR area is designed to hold common data in a PC Link System.
Allows for the connection of up to 32 PCs in a Net Link System where each is
contributing information to a common memory area. Data links may be
established in the LR and/or DM memory areas.
An automation concept in which control of each portion of an automated
system is located near the devices actually being controlled, i.e., control is
decentralized and "distributed" over the system. Distributed control is a
concept basic to PC Systems.
[E(lectrically) E(rasable) P(rogrammable) R(ead) O(nly) M(emory)] 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.
[E(rasable) P(rogrammable) R(ead) O(nly) M(emory)] A type of ROM in
which stored data can be erased, by ultraviolet light or other means, and
reprogrammed.
An I/O Unit for a Package-type PC that provides more I/O points to the PC.
A general-purpose computer, usually quite similar to a business computer,
that is used in automated factory control.
A Special I/O Unit. A High Speed Counter Unit counts independently of the
PC's cycle time. This allows counting of very short, fast signals.
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