Creator Electronics MAX1301 Specifikace stáhnout pdf (Strana 8)

3PLCs

Introduction

Programmable logic controllers (PLCs)

have been an integral part of factory

automation and industrial process

control for decades. PLCs are dedicated

computers that have an architecture

designed to accommodate control

functions. They control a wide array

of applications from simple lighting

functions to environmental systems

to complete chemical processing

plants. These systems perform many

functions, providing a variety of analog

and digital input and output interfaces,

signal processing, data conversion, and

various communications protocols.

The architecture of a PLC must be

suciently exible and congurable

to meet the diverse needs of a wide

variety of control applications. Inputs

(either analog or digital) are received

from human operators, machines,

sensors, and process events in the

form of voltage or current signals.

The PLC must accurately receive and

interpret these inputs so they can be

presented to the control application

running on the PLC, which will then

determine a set of outputs. These

outputs are sent to control actuators in

order to maintain control or to cause

desired modications in the process.

Modern PLCs were introduced in the

1960s, and for decades the general

function and signal-path ow changed

little. However, 21st century process

control is placing new and tougher

demands on PLCs: higher performance

(higher speed, greater precision),

smaller form factor, more functional

exibility, and built-in protection against

potentially damaging electrostatic

discharge (ESD), electromagnetic

interference and radio frequency

interference (EMI/RFI), and high-

amplitude transient pulses found

in the harsh industrial setting.

Today, the PLC role has been expanded

to include more targeted PLCs for

specic applications. Safety PLCs include

extra safety features and redundancy

for safety-critical applications. Mini- and

micro-PLCs automate simpler systems.

Standard PLCs are also improving and

are being integrated with other systems

such as programmable automation

controllers (PACs). PACs typically add

motion control, machine vision, easier

programming, more communications

functions, etc. Doing so allows the

PAC to be used in more complex

manufacturing operations, but the

boundaries between PACs and PLCs are

blurring as PLCs add PAC functionality.

Throughout this chapter, PLC will be

the generic term used for all types

of PLCs and PACs. Maxim’s products

can be used in all of these systems.

Overview

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