Omron C200HE-CPU11 Installation Manual page 235

I/O devices
I/O point
I/O table
I/O Unit
Limit Switch
Link Unit
operating mode
page
parallel interface
PC
PCB
PC Link Unit
Photoelectric Switch
Power Supply
printed circuit board
Programmable Controller
programming device
Glossary
The devices which are connected to the terminals on I/O Units, Special I/O Units,
or Intelligent I/O Units. I/O devices may be part of the Control System if they
function to help control other devices, or they may be part of the controlled sys-
tem if they interact directly with it.
The place at which an input signal enters the PC System or an output signal
leaves the PC System. In physical terms, an I/O point corresponds to terminals
or connector pins on a Unit; in terms of programming, an I/O point corresponds
to an I/O bit in the IR area.
Diagram written to the IR memory area listing the type of I/O units controlled by a
PC. It must be cleared before programming or when I/O units are changed.
Tables can be read, verified, or transferred to a EPROM.
The most basic type of Unit mounted to a Backplane. I/O Units include Input
Units and Output Units, each of which is available in a range of specifications.
I/O Units do not include Special I/O Units, Link Units, etc.
A switch that detects when an object has reached the limit of its movement by
actually making contact with the object. Limit Switches are fitted to electric ele-
vators, traveling cranes, etc. to indicate when a certain part of the equipment has
traveled to the specified limit.
Any of the Units used to connect a PC to a Link System. These are Remote I/O
Units, I/O Link Units, PC Link Units, Host Link Units, and Net Link Units.
The Display Terminal Unit can operate in five different modes: Page Read, Ter-
minal. Dynamic Scan, Read/Write, and Self-Diagnosis.
One complete Display Terminal Unit screen. Two hundred screens can be
stored on one RAM card.
The parallel interface uses the RS-232 connector, but is not serial communica-
tion. When parallel mode is selected as the communication mode, up to 16 Dis-
play Terminal Units can be connected to a PC in parallel.
An acronym for Programmable Controller.
An acronym for printed circuit board.
A Unit used to connect two or more PCs together so that they can exchange data
through their LR areas.
A switch that uses light to detect the presence of an object.
A Unit that mounts to a Backplane in a Rack PC. It provides power at the voltage
required by the other Units on the Rack.
A board onto which electrical circuits are printed for mounting into a computer or
electrical device.
A small, computer-like device that can control peripheral equipment, such as an
electric door or quality control devices, based on programming and peripheral
input devices. Any process that can be controlled using electrical signals can be
controlled by a PC. PCs can be used independently or networked together into a
system to control more complex operations.
A peripheral device used to write programs and to input a program to a PC or to
alter or monitor a program already stored in the PC. There are dedicated pro-
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