3G5A2-RPT01-PE datasheet(168/182 Pages) OMRON

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Glossary

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large display onto which ladder-diagram programs can be written directly in lad-

der-diagram symbols for input into the PC without conversion to mnemonic

form.

hexadecimal

A number system where all numbers are expressed to the base 16. In a PC all

data is ultimately stored in binary form, however, displays and inputs on Pro-

gramming Devices are often expressed in hexadecimal to simplify operation.

Each group of four binary bits is numerically equivalent to one hexadecimal digit.

host interface

An interface that allows communications with a host computer.

Host Link System

A system with one or more host computers connected to one or more PCs via

Host Link Units or host interfaces so that the host computer can be used to trans-

fer data to and from the PC(s). Host Link Systems enable centralized manage-

ment and control of PC Systems.

Host Link Unit

An interface used to connect a C-series PC to a host computer in a Host Link

System.

H-PCF cable

An acronym for hard plastic-clad optical fiber cable.

I/O allocation

The process by which the PC assigns certain bits in memory for various func-

tions. This includes pairing I/O bits to I/O points on Units.

I/O Block

Either an Input Block or an Output Block. I/O Blocks provide mounting positions

for replaceable relays.

I/O Control Unit

A Unit mounted to the CPU Rack to monitor and control I/O points on Expansion

CPU Racks or Expansion I/O Racks.

I/O delay

The delay in time from when a signal is sent to an output to when the status of the

output is actually in effect or the delay in time from when the status of an input

changes until the signal indicating the change in the status is received.

I/O device

A device connected to the I/O terminals on I/O Units, Special I/O Units, etc. I/O

devices may be either part of the Control System, if they function to help control

other devices, or they may be part of the controlled system.

I/O Interface Unit

A Unit mounted to an Expansion CPU Rack or Expansion I/O Rack to interface

the Rack to the CPU Rack.

I/O point

The place at which an input signal enters the PC System, or at which an output

signal leaves the PC System. In physical terms, I/O points correspond to termi-

nals or connector pins on a Unit; in terms of programming, an I/O points corre-

spond to I/O bits in the IR area.

I/O refreshing

The process of updating output status sent to external devices so that it agrees

with the status of output bits held in memory and of updating input bits in memory

so that they agree with the status of inputs from external devices.

I/O response time

The time required for an output signal to be sent from the PC in response to an

input signal received from an external device.

I/O Terminal

A Remote I/O Unit connected in a Wired Remote I/O System to provide a limited

number of I/O points at one location. There are several types of I/O Terminals.

I/O Unit

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.

3G5A2-RPT01-PE Datasheet(PDF) 168 Page - Omron Electronics LLC

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