Omron C120 System Manual page 121

Backplane
basic Link System
branch line
Branching Link Adapter
building-block PC
combined Link System
Control System
controlled system
Converting Link Adapter
CPU
CPU Backplane
CPU Rack
data area
distributed control
electrical noise
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.
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 control system that includes only one of the following systems: Remote I/O
System, PC Link System, Host Link System, or Net Link System.
A communications line leading from a Link Adapter to any but the terminators in
a Link System.
A Link Adapter used to branch connections to Units in a Link System. Used
either 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 Sys-
tem when each Unit supports only one connector.
A PC that is constructed from individual components, or "building blocks." With
building-block PCs, there is no one Unit that is independently identifiable as a
PC. The PC is rather a functional assembly of components.
A control system that includes more than one of the following systems: Remote
I/O System, PC Link System, Host Link System, or Net Link System.
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.
The devices that are being controlled by a PC System.
A Link Adapter used to convert between different types of optical fiber cable, dif-
ferent types of wire cable, or between optical fiber cable and wire cable. Such
conversion is necessary to connect Units that use different forms of communica-
tion.
An acronym for central processing unit. In a PC System, the CPU executes the
program, processes I/O signals, communicates with external devices, etc.
A Backplane used to create a CPU Rack.
Part of a building-block PC, the CPU Rack contains the CPU, a Power Supply,
and other Units. With most PCs, the CPU Rack is the only Rack that provides
linkable slots.
An area in the PC's memory that is designed to hold a specific type of data, e.g.,
the LR area is designed for to hold common data in a PC Link System.
A automation concept in which control of each portion of an automated system is
located near the devices actually being control, i.e., control is decentralized and
'distributed' over the system. Distributed control is a concept basic to PC Sys-
tems.
Electrical 'static' that can disturb electronic communications. The 'snow' that
can appear on a TV screen is an example of the effects of electrical noise.
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