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Autómatos Programáveis Industriais Curso Profissional de Técnico de Electrónica, Automação e Computadores
Módulo 6
Notas de apoio às aulas Parte I
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Autómatos Programáveis Industriais
Estrutura e Funcionamento
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Autómatos Programáveis Industriais Estrutura
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Autómatos Programáveis Industriais Funcionamento ON/OFF INICIALIZAR
LER ENTRADAS
EXECUTAR PROGRAMA
ACTUALIZAR SAÍDAS
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Autómatos Programáveis Industriais Autómatos Compactos
São constituídos por uma unidade que congrega todos os elementos necessários: CPU, entradas e saídas digitais, interface de comunicação, etc.. Alguns modelos admitem expansões.
Twido TELEMECANIQUE SCHNEIDER
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Autómatos Programáveis Industriais Autómatos Modulares
São constituídos por um conjunto de módulos interligados através de um “BUS” .
Twido TELEMECANIQUE SCHNEIDER
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Incluem a CPU, módulos de entradas e saídas digitais, módulos de entradas e saídas analógicas, módulos de comunicação para ligação a redes industriais, etc..
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Autómatos Programáveis Industriais Configuração típica de entradas com isolamento galvânico Autómato Twido Twido de 10 E/S
Entradas não polarizadas: I0 e I1
Níveis lógicos Relação tensão / corrente
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Autómatos Programáveis Industriais Configuração típica de entradas com isolamento galvânico Autómato Twido Twido de 10 E/S
Entradas não polarizadas: I2 a I5
Níveis lógicos Relação tensão / corrente
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Autómatos Programáveis Industriais Ligação de sensores às entradas de um Autómato Autómato Programável Industrial 0V
+24 V
PNP
+
-
output
output
-
+ 24 V 0 V DC OUT
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NPN
DC IN COM
0
1
2
3
4
5
+
+24 V 0 V DC OUT
DC IN COM
0
1
2
3
4
5
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Autómatos Programáveis Industriais Configuração típica de saídas com isolamento galvânico
Saída a relé
Saída a transístor
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Autómatos Programáveis Industriais
Ligação de pré-accionadores às saídas de um Autómato Programável Industrial
COM
0
1
2
COM
3
~
Devem sempre ser previstos aparelhos de protecção adequados ao tipo de cargas e à alimentação. António Henriques
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Autómatos Programáveis Industriais Memória Nos autómatos é comum encontrarmos dois tipos de memória: RAM que está dividida em áreas funcionais: uma para os dados, outra para programas e outra para constantes; EEPROM que tem duas áreas funcionais: uma para salvaguardar programa e constantes e outra parta salvaguardar palavras internas
✔
✔
O acesso à memória pode ser feito no formato bit ou palavra (word – 16 bits) Designação
Código
Designação
Código
Bits de entrada
%I
W or d
%MW
Bits de saída
%Q
Dupla Word
% DW
Bits internos
%M
Word Flutuante
%MF
Bits de sistema
%S
Constante
%KW
Dupla Constante
%KD
Constante Flutuante
%KF
Word de Sistema
%SW
Bits de de te temporizadores Bits de contadores
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%TM %C
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Autómatos Programáveis Industriais
Endereçamento de Entradas/Saídas % I y. z
% Q y. z
Onde: I e Q representam as imagens dos bits presentes nas entradas e saídas, respectivamente. y representa o número do módulo. 0 para a CPU e 1 a 7 para as expansões. z número da entrada ou saída ➔ ➔ ➔
Exemplos: ● ● ● ●
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%I0.4 – entrada 4 na CPU %I1.6 – entrada 6 no módulo de expansão 1 %Q0.0 – saída 0 na CPU %Q2.7 – saída 7 no módulo de expansão 2
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Autómatos Programáveis Industriais
Endereçamento de bits internos e de sistema
Os bits internos são equivalentes a relés auxiliares, são utilizados para armazenar resultados intermédios durante a execução dos programas
%Mn
%Sn
Onde: M refere-se a um bit de memória de dados. S refere-se a um bit de sistema. n indica o número do bit ➔ ➔ ➔
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Autómatos Programáveis Industriais
Endereçamento de words internas e de sistema
Os bits internos são equivalentes a relés auxiliares, são utilizados para armazenar resultados intermédios durante a execução dos programas
%MWn Onde: MW refere-se a uma word de memória de dados. SW refere-se a uma word de sistema. n indica o número da word ➔ ➔ ➔
%SWn
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Autómatos Programáveis Industriais
Endereçamento de blocos de funções
Cada bloco de função tem um conjunto de endereços associado que permite aceder à sua parametrização, às entrada(s) e saída(s), etc.. São exemplos comuns de blocos de função: Temporizadores; Contadores; Registos de deslocamento; RTC (relógio em tempo real); etc..
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Autómatos Programáveis Industriais
Referências: Francisco, António, Autómatos Programáveis, 4ª edição, Lisboa, LIDEL Oliveira, Paulo, Automação Industrial , Lisboa, LIDEL Documentação técnica de fabricantes de autómatos: Schneider Electric; Sites na Internet: http://www.automatas.org/ http://olmo.pntic.mec.es/jmarti50/portada/index.htm