BECKHOFF AUTOMATION MANUAL DE FORMAÇÃO DE TwinSAFE 3.1
por Jorge Andril
01 / 2017
•
BRESIMAR AUTOMAÇÃO , S.A. •
•
Departamento de Engenharia ASATEK
Quinta do Simão EN109 - Esgueira Apartado 3080 •
•
•
www.bresimar.pt
3800-230 Aveiro PORTUGAL •
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O agradecimento à BECKHOFF AUTOMATION pelo fornecimento de documentação técnica e à BRESIMAR AUTOMAÇÃO S.A. pela disponibilidade de equipamentos para a execução de testes de campo.
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A BRESIMAR AUTOMAÇÃO é uma empresa com sede em Aveiro, Portugal
A Bresimar Automação S.A é uma empresa familiar especializada em Automação Industrial. Fundada em 1982 foi evoluindo a sua atividade comercial e atualmente divide-se em 3 áreas de negócios. .,
Essas áreas de negócios são as seguintes:
Comercialização de equipamentos para automação industrial através da representação exclusiva de diversas marcas, mundialmente conceituadas (INSYS-icom , Beckhoff , Siemens , Turck , Beijer , entre outras ) . Serviços de engenharia de automação e controlo para processos industriais com desenvolvimento desenvolvimento de software para PLCs e HMIs . Este serviço possui a marca marca registada registada asaTek . . Produção e desenvolvimento de transmissores e sensores de temperatura incluindo sistemas sem fios. Estes equipamentos tem a marca registada tekOn .
Possui uma equipa técnica qualificada, que presta serviços de assistência pré e pós-venda, que propõe e aconselha soluções tecnológicas inovadoras. A gestão está focada e orientada para os clientes, pelo que efetua uma seleção muito criteriosa de fornecedores. A formação é um fator determinante para a qualidade dos serviços prestados por todos os colaboradores. Espero que estes apontamentos técnicos vos sejam úteis nas vossas aplicações de automação industrial! Obrigado pela vossa atenção. Saudações Jorge Andril
[email protected] http://pt.linkedin.com/in/jorgeandril
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LISTA DE CONTEÚDOS
I – Introdução ao TwinSAFE do TwinCAT 3.1 I-1 I-2 I-2.1 I-2.2 I-2.3 I-2.4 I-2.5
– Introdução Introdução à Segurança-Máquina – Diretivas e normas de Segurança-Máquina – Introdução à Diretiva Máquina – Diretiva Diretiva Máquina 2006/42/CE – Tipo de normas existentes – Análise de risco – Segurança funcional
1
5 5 5
6 8 9
II – Terminais e dispositivos de segurança II-1 II-1.1 II-1.1.1 II-1.1.2 II-1.1.3 II-1.1.4 II-1.1.5 II-1.1.6 II-1.2 II-1.2.1 II-1.2.2 II-1.2.3 II-1.2.4 II-1.2.5 II-1.2.6 II-1.3 II-1.3.1 II-1.3.2 II-1.3.3 II-2 II-2.1 II-2.2 II-2.3 II-2.4 II-2.5 II-2.6
– Terminais Terminais de segurança BECKHOFF – Especificações Especificações dos terminais de entradas seguras – Diagrama de bloco do EL1904 – Teste de impulsos nas entradas seguras – Tabela – Tabela dos parâmetros do EL1904 (“Safety (“Safety Parameters”) Parameters”) – Exemplo de configuração dos parâmetros do EL1904 – Diagnostico de estado e erros – Objetos Objetos de diagnostico (CoE objects) – Especificações Especificações dos terminais de saídas seguras – Diagrama de bloco do EL2904 – Teste de impulsos nas saídas seguras Parameters”) – Tabela (“Safety Parameters”) Tabela dos parâmetros do EL2904 (“Safety – Diagnostico de estado e erros – Objetos Objetos de diagnóstico (CoE objects) – Possíveis causas das mensagens de diagnostico – Especificações Especificações dos terminais com controlador lógico TwinSAFE – Programação do código lógico de segurança – Diagnostico de estado e erros – Objetos Objetos de diagnóstico (CoE objects) – Dispositivos de segurança – Comandos Comandos de paragem de emergência – Comandos Comandos de bimanual – Barreiras Barreiras óticas de segurança – Scanners – Scanners laser de segurança – Tapetes Tapetes e batentes de segurança – Portas Portas e trincos de segurança
11 14
15 15 16 16 17 18 20
20 20 21 22 23 24 25
20 26 27 29 29 30 31 32 33 34
III – TwinCAT 3.1 – Programação Programação de modulo SAFETY III-1 III-1.1 III-1.2 III-1.3 III-1.4 III-1.5 III-1.6
– Programação do TwinCAT 3.1 SAFETY – Arquitetura Arquitetura base do hardware do kit de formação – Criar projeto de segurança no TwinCAT SAFETY – Criar programa de automatismo no TwinCAT PLC – Linkagem Linkagem dos alias do projeto SAFETY com o programa PLC – Criar programa de segurança do TwinCAT SAFETY – Verificação do programa de segurança TwinCAT SAFETY
35 35
36 42 43 44 49
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BECKHOFF AUTOMATION TwinSAFE V3.1
IV - Esquemas de segurança com TwinSAFE T winSAFE IV-1 IV-1.1 IV-2 IV-2.1 IV-3 IV-3.1 IV-4 IV-4.1 IV-4.2 IV-5 IV-5.1 IV-5.2 IV-5.3 IV-5.4 IV-6 IV-6.1 IV-6.2 IV-6.3 IV-6.4 IV-6.5 IV-6.6 IV-6.7
– Circuito de comando a duas mãos com TwinSAFE – BIMANUAL BIMANUAL – Cat. 4 e PL=e – Circuito com tapetes de segurança com TwinSAFE – TAPETE TAPETE DE SEGURANÇA – Cat. 4 e PL=e – Circuito de scanners laser de segurança com TwinSAFE – SCANNER SCANNER LASER – Cat. 3 e PL=e – Circuito de barreiras luminosas de segurança com TwinSAFE – BARREIRA BARREIRA LUMINOSA – Cat. 4 e PL=e – BARREIRA BARREIRA LUMINOSA (com Muting) – Cat. 4 e PL=e – Circuito de portas de segurança com TwinSAFE – PORTA PORTA DE SEGURANÇA (1ª variante) – Cat. 4 e PL=e – PORTA PORTA DE SEGURANÇA (2ª variante) – Cat. 3 e PL=e – PORTA PORTA DE SEGURANÇA (com monitorização) – Cat. 4 e PL=e – PORTA PORTA DE SEGURANÇA (com encravamento) – Cat. 4 e PL=e – Circuito de paragem de emergência com TwinSAFE – BOTÃO BOTÃO DE EMERGÊNCIA (1ª variante) – Cat. 4 e PL=e – BOTÃO BOTÃO DE EMERGÊNCIA (2ª variante) – Cat. 3 e PL=d – BOTÃO BOTÃO DE EMERGÊNCIA (3ª variante) – Cat. 3 e PL=e – BOTÃO BOTÃO DE EMERGÊNCIA (4ª variante) – Cat. 4 e PL=e – BOTÃO BOTÃO DE EMERGÊNCIA (5ª variante) – Cat. 4 e PL=e – BOTÃO BOTÃO DE EMERGÊNCIA (6ª variante) – Cat. 3 e PL=d – BOTÃO BOTÃO DE EMERGÊNCIA (7ª variante) – Cat. 4 e PL=e
58 58 59 59 60 60 61 61 62 63 63 64 65 66 68 68 69 70 71 72 73 74
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BRESIMAR AUTOMAÇÃO
Capítulo I
I – Introdução Introdução ao TwinSAFE do TwinCAT 3.1 Apresentação do modulo modulo TwinSAFE do TwinCAT TwinCAT 3.1 O módulo TwinSAFE do TwinCAT 3 é o software de programação para os PLCs de segurança, da marca alemã BECKHOFF. O TwinSAFE representa a continuação da filosofia de controle baseado em PCs, aberta e escalável. Devido à sua modularidade e versatilidade os terminais TwinSAFE encaixam perfeitamente na filosofia, já existente, dos sistemas de controlo BECKHOFF. BECKHOFF. Isto é, é, podemos incorporar no mesmo PLC (TwinCAT (TwinCAT 3 PLC), PLC), responsável pelo automatismo clássico de uma máquina industrial, um modulo de segurança (TwinSAFE (TwinSAFE). ). Assim, não necessitamos de ter no mesmo quadro de controlo dois PLC´s (um para o automatismo e outro para os dispositivos de segurança-máquina). Este modulo TwinSAFE cumpre toda a Legislação e Normas Europeias, atualmente em vigor.
I-1 – Introdução Introdução à segurança homem-máquina
Quando falamos de Segurança ( Safety Tecnology ) na automação industrial estamos a falar de funções específicas para máquinas, equipamentos e processos industriais relacionados à proteção de pessoas. Na maioria dos locais há requisitos legais para a proteção dos operadores de máquinas. Esses regulamentos geralmente são baseados em padrões nacionais e internacionais (por exemplo a Diretiva Máquina 2006/42/CE), mas podem variar entre regiões e nações. É da responsabilidade do projetista da automação verificar e desenhar esses sistemas de segurança para as suas máquinas industriais. A premissa principal dos sistemas de segurança, para as máquinas industriais, é o controlo das diversas fontes de energia nelas contidas. Toda essa fonte de energia armazenada em um sistema deve ser tida em conta e controlada. Isso inclui fontes elétricas, pneumáticas e hidráulicas. Inclui energia potencial armazenada em cargas suspensas, molas e ar comprimido tal como a energia cinética de partes móveis. Os sistemas de segurança funcionam interrompendo essas fontes de energia e controlando a energia potencial ou cinética. Os sistemas de segurança envolvem também uma adequada proteção pr oteção mecânica, de forma a que os operadores não possam entrar em contacto com áreas perigosas da máquina enquanto as diversas fontes de energia estão ligadas ou a energia potencial não está controlada.
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BRESIMAR AUTOMAÇÃO
Capítulo I
Um sistema de segurança devidamente projetado consiste em elementos mecânicos, elétricos e cada vez mais elementos com uma componente de software. Todos estes elementos combinam-se para formar uma condição de trabalho segura para os operadores de máquinas e pessoal de manutenção. As exigências sobre a fiabilidade dos elementos elétricos e de software são suficientemente fortes para que componentes elétricos e PLC´s comuns sejam inaceitáveis para uso em sistemas de segurança-máquina. segurança-máquina . Em geral (e isso i sso depende de casos específicos) os componentes elétricos e de software devem ser projetados de tal forma que qualquer falha de um único co mponente não leve a uma perda da função de segurança. Essa falha, uma vez detetada, terá de ser relatada e deverá impedir o funcionamento da máquina industrial até que ela seja reparada. Tomemos como exemplo um relé elétrico. Um relé típico não é um componente apropriado para uso em sistemas elétricos de segurança, pelas seguintes razões: 1.
2.
O relé pode falhar, normalmente por colagem do contato, na posição de trabalho. Neste caso perde a capacidade de eliminar a fonte de energia elétrica, quando ocorrer uma emergência que obriga ao corte e interrupção dessa energia. Nós detetamos a falha de um relé monitorizando um contato normalmente fechado. Dependendo da construção do relé, a falha pode não ser detetada se o contato normalmente fechado não estiver mecanicamente ligado a um contato normalmente aberto. Para interromper de forma fiável uma fonte de energia elétri ca, de maneira a que a falha de um componente não cause uma perda da função de
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BRESIMAR AUTOMAÇÃO
Capítulo I
Os PLCs (EK1960 (EK1960)) ou os Controladores lógicos da BECKHOFF (EL6900, EL6900, EL6910, EL6910, EL6930) EL6930) de segurança são capazes de fornecer essas funções de controlo e monitorização. É importante destacar que os dispositivos de entrada, tais como botões de paragem de emergência, interruptores de portas de proteção, barreiras de segurança fotoelétricas e tapetes de segurança também são construídos com componentes elétricos redundantes e devem ser monitorizados o seu correto funcionamento. Os módulos lógicos de controlo TwinSAFE EL6900, EL6900, EL6910, EL6910, EL6930 podem monitorizar todos estes componentes, tal como o PLC de segurança TwinSAFE EK1960. EK1960. Existe também um controlador lógico para as cartas do tipo KL (KL6904).
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BRESIMAR AUTOMAÇÃO
Capítulo I
Como é de esperar existem requisitos especiais que teremos de cumprir num projeto com um PLC ou controlador lógico de segurança. Assim, como qualquer outro dispositivo em um sistema de segurança, segurança, a falha de qualquer componente no PLC ou controlador de segurança não deve resultar na perda da sua função de proteção e deve ser imediatamente detetada. Isso inclui os componentes elétricos e de software. Os projetos terão de ser certificados certifi cados por entidades certificadoras externas e independentes do fabricante, antes de serem colocados no mercado. O programa de segurança, segurança, na Beckhoff, é desenvolvido no editor do TwinCAT 3 pasta SAFETY pasta SAFETY e e correrá nos módulos lógicos EL6900, EL6900, EL6910, EL6910, EL6930 ou no PLC no PLC EK1960. Este programa é separado do programa do automatismo residente no soft PLC PLC clássico.
Os dispositivos de monitorização de segurança ( entradas de segurança) estão ligados às cartas EL1904 ou EP1908 e EP1908 e os dispositivos de acionamento de segurança (saídas de segurança) estão ligados às cartas EL2902 ou EL2904 . EL2904 . Ambas são certificadas como dispositivos de segurança. A comunicação entre a placa controladora de segurança (ex. EL6900) e as entradas/saídas seguras (ex. EL1904/ EL1904/EL2904) é EL2904) é feita através da rede EtherCAT IO normal. IO normal. Isso é possível porque a comunicação usa um protocolo certificado para segurança designado por FSoE (Fail-safe over
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BRESIMAR AUTOMAÇÃO
Capítulo I
I-2 – Diretivas Diretivas e normas da Segurança Homem-Máquina I-2.1 – Introdução Introdução à Diretiva Máquina
A segurança das pessoas é um especto fundamental nas sociedades modernas e industriais. Todos os dias há milhares de pessoas que operam máquinas industriais na sua atividade profissional. É obrigação das sociedades modernas e desenvolvidas garantir que todos exerçam as suas funções e atividades de uma forma o mais segura possível. Em 2006 a União Europeia elaborou uma Diretiva que define diversos requisitos obrigatórios e que deverão ser aplicados, quando da construção de novas máquinas ou em alterações ( retrofitting) de máquinas antigas. Essa Diretiva é a designada 2006/42/CE. 2006/42/CE. Em Portugal, no que respeita à segurança, foi transposta para a Legislação Portuguesa por Decreto de Lei as seguintes normas europeias:
Decreto-Lei nº 50/2005 de 25 de Fevereiro Transpõe para a ordem jurídica interna a Diretiva nº 89/655/CEE do 89/655/CEE do Conselho de 30 de Novembro. Foi alterada pela Diretiva nº 95/63/CE do 95/63/CE do Conselho de 5 de Dezembro e pela Diretiva nº 2001/45/CE do Parlamento Europeu e do Conselho de 27 2 7 de Junho. Este decreto-lei regula as prescrições mínimas de segurança e de saúde a serem cumpridas pelos operadores de equipamentos de trabalho.
Decreto-Lei nº 103/2008 de 24 de Junho Transpõe para a ordem jurídica interna a Diretiva nº 2006/42/CE, 2006/42/CE, do Parlamento Europeu e do Conselho de 17 de Maio, relativa às máquinas e que altera a Diretiva nº 95/16/CE, do 95/16/CE, do Parlamento Europeu e do Conselho de 29 de Junho, relativa à aproximação das legislações dos estados membros respeitantes aos ascensores. Este decreto-lei estabelece as regras a que deve obedecer à colocação no mercado e à entrada em serviço das máquinas e das quase-máquinas.
I-2.2 – Diretiva Diretiva Máquina 2006/42/CE
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BRESIMAR AUTOMAÇÃO
Capítulo I
RESUMO DO OBJETIVO DA DIRETIVA MÁQUINA 2006/42/CE
A Diretiva de Máquinas 2006/42/CE que que entrou em vigor a partir de 29 de Dezembro de 2009 aplicasse a todas as máquinas feitas e disponíveis no mercado da Comunidade Europeia além da Suíça e Turquia. Esta nova diretiva teve como objetivo aumentar a eficácia da ante rior, a 98/37/CE, bem como esclarecer eventuais duvidas de interpretação da norma sem alterar substancialmente as suas especificações. A nova diretiva inclui a aplicação do risco e todos os critérios essenciais de segurança a serem observados e cumpridos. Todo o fabricante de máquinas tem que cumprir um conjunto mínimo de requisitos antes de uma máquina poder ser colocada no mercado. A máquina tem de cumprir os Requisitos de Saúde e Segurança , indicados no Anexo I da Diretiva, estabelecendo assim um nível mínimo comum de proteção em todo o Espaço Economico Europeu. Os fabricantes de máquinas ou os seus representantes, autorizados na União europeia, devem assegurar que a máquina está de acordo com a Diretiva tendo que disponibilizar às autoridades competentes, quando requerido, um documento técnico. A máquina tem também de possuir uma marcação CE e uma de claração de Conformidade. Todas as máquinas devem ser utilizadas de acordo com as Instruções de Trabalho do fabricante.
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BRESIMAR AUTOMAÇÃO
Capítulo I
NORMAS DO TIPO A São normas que definem conceitos básicos, princípios para a conceção e aspetos gerais que podem ser aplicados às máquinas. Estas normas são:
EN ISO 12100-1 e 12100-1 e -2:2010 (substitui -2:2010 (substitui a EN292-1 e EN292-1 e EN292-2): EN292-2): Conceitos básicos, princípios gerais para o projeto. EN 61508: 61508: Segurança funcional dos dispositivos elétricos, sistemas com eletrónica programável. EN ISO 14121:2007: 14121:2007: Princípios da avaliação de risco.
NORMAS DO TIPO B São normas em grupo que focam aspetos particulares respeitantes à segurança, estando dividida em duas categorias. Categoria B1 Normas sobre alguns aspetos de segurança, como exemplo, distâncias de segurança, níveis de temperaturas e ruido, princípios ergonómicos das máquinas, etc
EN 62061: 2005: 2005: Funções de segurança relacionadas com a funcionalidade elétrica e sistemas de controlo eletrónico EN ISO 13849-1:2006 e -2:2003: -2:2003: Segurança de sistemas de controlo.
Categoria B2 Normas que descrevem as características dos dispositivos de segurança como
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BRESIMAR AUTOMAÇÃO
Capítulo I
I-2.4 – Analise Analise de risco Quando se constrói uma máquina é necessário identificar todos os riscos possíveis a que os utilizadores estão expostos de modo a torna-la segura na sua utilização. A identificação e classificação dos riscos permitem avaliar os perigos existentes e quais os tipos de ferimentos possíveis. As normas EN ISO 12100 e 12100 e EN 14201 definem 14201 definem a metodologia de analise, avaliação e procedimentos para a redução desses riscos. Estas normas definem um modelo de analise cíclico que perante a fixação de metas iniciais permite a analise dos riscos existentes e possíveis soluções para os mesmos. Esta avaliação é efetuada varias vezes até que as metas definidas estejam satisfeitas. Noutras palavras, quando da analise, se um risco pode ser reduzido este obrigatoriamente tem de o ser. O modelo introduzido por estas duas normas, como anteriormente foi dito, pretende reduzir ou eliminar os riscos existentes através de um processo de analise cíclico e que tem os seguintes passos:
1º Passo: Eliminação Passo: Eliminação dos riscos na origem através da utilização de princípios de projeto e conceção intrinsecamente seguros.
2º Passo: Redução Passo: Redução de riscos através da salvaguarda e de sistemas de controlo.
3º Passo: Prevenção Passo: Prevenção de riscos residuais informando os utilizadores e operadores das máquinas.
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BRESIMAR AUTOMAÇÃO
Capítulo I
I-2.5 – Segurança Segurança Funcional Na ultima década, deste seculo, têm sido publicadas diversas normas sobre segurança funcional. Algumas dessas normas são a IEC 61508, 61508, IEC 62061, IEC 61511, 61511, ISO 13849-1 e 13849-1 e IEC 61800-5-2. 61800-5-2. O conceito de segurança funcional vem substituir as antigas categorias de comportamento, em caso de falha, que eram definidas na EN 954-1. 954-1.
A “velha” NORMA EN 954-1
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BRESIMAR AUTOMAÇÃO
Capítulo I
NORMA IEC 62061 A norma internacional IEC 62016 considera cada função de segurança em detalhe tendo que ser elaborados requisitos de segurança específicos. Nestes requisitos incluem-se os seguintes pontos: Especificação
funcional : : O que cada função faz em pormenor. Especificação de integridade de segurança : Define : Define a probabilidade de que o exigido à função será realizado sob condições especificas. A especificação de integridade de segurança, considera falhas de hardware e falhas de sistema. As falhas de sistema são aquelas que estão relacionadas com causas especificas e apenas podem ser evitadas pela remoção das respetivas causas, geralmente através de uma modificação do desenho. Em geral estas falhas resultam de especificações incorretas no inicio do projeto. Na norma IEC 62061 é estabelecido um requisito de integridade de segurança através de um valor que indica a probabilidade de falhas perigosas por hora para cada função de segurança relacionada. O valor para o Nivel de Integridade de Segurança SIL é SIL é calculado através do nível ní vel de segurança de cada componente ou de cada subsistema. A determinação do SIL (“Safety Integrity Level” ) é exemplificada na tabela seguinte :
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BRESIMAR AUTOMAÇÃO
Capítulo I
DC (“Diagnostic Coverage”) : É uma medida que indica quantas falhas falh as perigosas o sistema de diagnóstico irá detetar. É estabelecido através do seguinte quadro:
CATEGORIA : CATEGORIA : São as mesmas que estão estabelecidas no anexo 2 da norma EN 945-1 (ver pag.8). Com as três variáveis anteriores (MTTF (MTTF,, DC e DC e CATEGORIA) CATEGORIA) é encontrado o nível PL. PL. Na tabela seguinte é apresentado um método simplificado de determinação desse nível PL conforme PL conforme a Tabela 7 da norma ISO 13849-1.
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BRESIMAR AUTOMAÇÃO
Capítulo I
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BRESIMAR AUTOMAÇÃO
Capítulo II
II – Terminais e dispositivos de segurança Apresentação dos componentes componentes de segurança para o TwinSAFE TwinSAFE O módulo TwinSAFE do TwinCAT 3 é o software de programação para os PLCs ou controladores de segurança BECKHOFF. O modulo de software TwinSAFE só por si não permite construir um sistema seguro. É necessário ter hardware que agrupe a lógica residente no software TwinSAFE com os órgãos funcionais perigosos da máquina industrial, através atr avés de equipamentos seguros. O hardware necessário é constituído por dois grupos funcionais: - 1º grupo é constituído por terminais de segurança que são incorporados no hardware do PLC ou controlador lógico de segurança BECKHOFF (cartas de entradas e saídas digitais seguras). - 2º grupo é constituído por dispositivos de segurança (bimanual , botão de emergência, barreiras luminosas, portas de acesso seguro, etc) , externos externos ao PLC ou controlador de segurança, segurança, que são instalados fisicamente na máquina industrial que pretendemos certificar segundo as normas de segurança.
II-1 – Terminais de segurança BECKHOFF
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BRESIMAR AUTOMAÇÃO
Capítulo II
O programa de segurança, na Beckhoff, é desenvolvido no editor do TwinCAT3 pasta SAFETY pasta SAFETY e e correrá nos módulos lógicos EL6900, EL6900, EL6910, EL6910, EL6930 ou no PLC no PLC EK1960. Este programa é separado do programa do automatismo clássico, residente no soft PLC PLC TwinCAT PLC.
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BRESIMAR AUTOMAÇÃO
Capítulo II
Como exemplo, a carta EL1904 (na figura em baixo) possui 4 canais de entradas seguras. A estes 4 canais ligamos eletricamente equipamentos de segurança. Esses equipamentos de segurança podem ser botões de paragem de emergência, comando de máquina bimanual , portas de controlo de acesso a zonas perigosa s, scanners laser para para zonas perigosas, barreiras luminosas, tapetes de segurança de zona, etc
II-1.1.1 – Diagrama de bloco do EL1904
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BRESIMAR AUTOMAÇÃO
Capítulo II
II-1.1.3 – Tabela dos parâmetros do EL1904 (“Safety Parameters”) Nome Parâmetro “FS Operating Mode” “Operating Mode” [8000:01]
“Sensor test Channel 1 active” [8001:01] “Sensor test Channel 2 active” [8001:02] “Sensor test Channel 3 active” [8001:03] “Sensor test Channel 4
Significado Endereço FS0E atribuído pelo DIP switch Modo de Operação das entradas digitais de segurança Gerar trem de impulsos a sair pelo Input 1+ e a entrar em Input 1Gerar trem de impulsos a sair pelo Input 2+ e a entrar em Input 2Gerar trem de impulsos a sair pelo Input 3+ e a entrar em Input 3Gerar trem de impulsos a sair pelo Input
Valor 1 a 65535 digital standstill monitoring 1” ou “2” / FALSE TRUE / “
” ”
“
/ FALSE TRUE / TRUE / FALSE
/ FALSE TRUE /
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BRESIMAR AUTOMAÇÃO
Capítulo II
Parâmetros para as barreiras luminosas ou scanners la ser de segurança (“ Safety Parametrs”):
A figura seguinte mostra as configurações dos parâmetros para uma barreira luminosa de segurança ligada eletricamente ao Input 1 e 1 e 2 da carta EL1904. Neste exemplo o parâmetro 8002:01 também podia ser configurado com ”any pulse ”. Os parâmetros 8001:01 e :02 do Input 1 e 1 e 2 têm de ter pulse repetition OSSD, sensor test deactivated ”. o teste “Sensor test Channel ? active” desativado (FALSE ). ).
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BRESIMAR AUTOMAÇÃO
Capítulo II
1º LED: “ Diag 1” (cor verde) - Indica o estado da interface do TwinSAFE Codificação do erro ( piscar do LED)
Significado
LED aceso continuamente
Em funcionamento normal : Sem erros e comunicação do TwinSAFE OK
Piscar rápido, alternando com 1 impulso flash Piscar rápido, alternando com 2 impulso flash Piscar rápido, alternando com 3 impulso flash Piscar rápido, alternando com 4 impulso flash
Erro nos parâmetros S (parâmetro TwinS AFE ) Erro nos parâmetros I (parâmetro I ndividual ndividual )
À espera dos parâmetros S e I. Parâmetros S I corretos (espera ordem de controlo)
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BRESIMAR AUTOMAÇÃO
Capítulo II
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BRESIMAR AUTOMAÇÃO
Capítulo II
II-1.2 – Especificações dos terminais de saídas seguras (KL/EL/EJ 29xx) Os terminais de saídas digitais para segurança máquina, disponíveis na BECKHOFF, são os seguintes: Barramento KL (K bus) - KL2904 (4 KL2904 (4 saídas digitais seguras)
Barramento EL (EtherCAT) - EL2901 (contatos EL2901 (contatos potencia 1 canal) - EL2902 (2 EL2902 (2 saídas digitais seguras)
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BRESIMAR AUTOMAÇÃO
Capítulo II
Para termos esta função de teste de impulsos, em cada um dos canais da carta EL2904, teremos no TwinSAFE
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BRESIMAR AUTOMAÇÃO Janela dos parâmetros da carta EL2904.
Capítulo II
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BRESIMAR AUTOMAÇÃO
Capítulo II
II-1.2.5 – Objetos de diagnóstico (CoE objects) Os objetos de diagnóstico servem para internamente verificarmos as possíveis causas de maus funcionamentos da
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BRESIMAR AUTOMAÇÃO
Capítulo II Bit 0
Temperatura fora das especificações 1bin Temperatura alta no µC1
RO 0bin
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BRESIMAR AUTOMAÇÃO
Nível de tensão elétrica muito alta nos contatos de
Capítulo II Reduza o nível de Tensão elétrica para os valores corretos e faça o
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BRESIMAR AUTOMAÇÃO
Capítulo IV
Existem diversas configurações:
1ª - A primeira é a configuração standard e de defeito como defeito como mostra a figura anterior. A propriedade 8001:01 e 8001:02 está a TRUE. Isto significa que é feito o teste de curto-circuito e curto-circuito e de ligações através da geração de impulsos em cada canal. cruzadas através cruzadas A propriedade 8002:01 está com “single “ single logic channel ½”. ½”. Isto significa que estes dois canais trabalham em conjunto e em combinação lógica. Irá ser feito o teste para detetar a existência de discrepância temporal entre eles. Esta configuração é a apropriada para todos os equipamentos de segurança com contatos secos secos tais tais como botões de paragem de emergência, emergência , portas de segurança segurança e e contactos NF de retorno do relé ou contator de segurança. A para cada contacto seco fornece 24Vdc no polo + e gera um trem de impulsos que carta para carta seco fornece impulsos que espera receber no polo contrario - do canal. Para haver diferenciação entre cada canal da carta cada um deles gera impulsos desfasados carta cada temporalmente. Isto permite detetar se há troca de cabos entre os canais e se existe curto-circuito dos 24V ou 0V vindo de outro canal.
2ª – A segunda configuração configuração é é quando temos equipamentos de segurança que emitem impulsos de teste externos OSSD nas suas saídas. Neste caso o teste de impulsos é EL1904 não precisa impulsos é feito pelo equipamento de segurança externo, logo a carta carta EL1904 deste teste ativo. Neste caso temos de desligar o teste de impulsos dos impulsos dos canais usados e temos de configurar com a propriedade de aceitar impulsos externos OSSD. No exemplo da figura anterior temos o canal 1 e 2 com a propriedade “asynchronous “ asynchronous analysis OSSD, sensor test deactivated ”. deactivated ”. A A indicação de sinais assíncronos indica que esses equipamentos de segurança externa emitem sinais desfasados temporalmente que nunca se sobrepõem. Se o fizerem é considerado uma falha.
3ª – A terceira configuração serve para alguns dispositivos de segurança que não tem impulsos assíncronos. Neste configuração serve caso devem evitar usar estes dispositivos de segurança. Todavia se quiserem, mesmo assim, utiliza-los com a carta EL deverão configurar a propriedade 8002 do canal ½ ou ¾ como “any “ any pulse repetition OSSD, sensor test deactivated ”. ”. Neste caso permite trabalhar com a carta carta EL dispositivo de segurança externo com sinais OSSD simultâneos, não dando assim erro.
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BRESIMAR AUTOMAÇÃO
Capítulo IV
Configuração exemplo da carta com saídas digitais seguras EL2904 : Ao clicar duas duas vezes na pasta TwinSAFE no alias do EL2904 (ex. Safety Out 1) alias do 1) deverá aparecer na janela central do seu editor as propriedades desta carta carta,, como mostra a figura seguinte:
O endereço FSoE da da carta carta de de saídas de segurança encontra-se na parte superior. Este endereço deve corresponder ao endereço do DIP-switch DIP-switch que que se encontra na carta DIP-switch tivesse tivesse o endereço 3 teríamos de colocar 3 carta.. Se o DIP-switch nessa janela. Esta carta carta de de 4 saídas seguras tem 4 parâmetros de configuração e que são os seguintes : 8000: 01 – “Standard outputs active” active” permite que liguemos uma saída do PLC a uma saída segura e a carta automaticamente faz um “AND” do valor logico da saída do PLC com o valor de saída segura. Isso permite que o PLC anule uma saída, desligando-a. Neste caso a lógica de segurança é responsável pela permissão de ligar a saída, mas o PLC controla a altura do seu acionamento. Este funcionamento tem vantagens e desvantagens devido aos seguintes pontos: Em 1º lugar - Esta parametrização torna mais confusa a lógica do seu funcionamento. funcionamento. Podemos obter o mesmo mesmo funcionamento e o mesmo efeito com um bloco “AND” dentro da Função Bloco de segurança. Em 2º lugar – lugar – Se Se quisermos monitorizar a saída, na lógica de segurança, para nos certificarmos de que liga e desliga quando o forçamos (através de um circuito de feedback) não conseguimos faze-lo se a lógica de segurança não tem acesso ao sinal do PLC. Na minha opinião deve deixar este conjunto em FALSE e não usar este recurso. Fazermos a ló gica “AND” toda dentro da Função Bloco de segurança e não usa usamos mos “saídas standard”. 8000: 02 – “Current measurement active” active ” permite detetar falha falh a no circuito de ligação ao relé ou contator de segurança. Com este recurso ativo quando a saída está ligada a carta espera receber uma corrente de retorno entre carta espera 20mA a 500mA. Caso não receba esta corrente a carta EL entra em falha. Obviamente se o dispositivo que está a ligar (rele de segurança) não tem t em esse “consumo” de corrente terá d e se desativar esta funcionalidade. Na minha experiencia este recurso é sujeito a algumas falhas e pode dar falsos ala rmes. Isto deve-se ao consumo próximo dos limites e que devido aos picos de consumo leva a ultrapassá-los. 8000: 03 – 03 – “Testing of outputs active permite permite detetar circuitos cruzados e por canal (saída). O t este é feito cruzados e trocados trocados por através de um trem de impulsos impulsos gerado em cada canal de saída de uma maneira assíncrona. Ao ser assíncrono garante que os impulsos não se sobrepõem. Os impulsos são todos de comprimentos diferentes variando de 300 a 800 µs µs.. Estes impulsos são suficientemente curtos para não interferirem no funcionamento do relé eletromecânico. No geral esta propriedade deve estar ativa exceto nos casos de utilizar mos dispositivos de corte eletrónicos que não toleram estes impulsos de teste. ”
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV-1 – Circuito com comando a duas mãos com TwinSAFE IV-1.1 – BIMANUAL [Function Block TWOHAND] TWOHAND] - Categoria 4 e PL=e O comando a duas mãos consiste numa combinação de contactos normalmente fechados (NF) e normalmente abertos (NA) ligadas a entradas seguras na carta EL1904. A propriedade de “ teste de entradas” está ativa e os sinais são controlados para uma discrepância máxima de 200ms. Alem disso o acionamento síncrono dos dois botões é ativado com um tempo de 500ms. O loop de realimentação do estado dos contatores é feita através de uma entrada segura em um 2º EL1904. Os contatores K1 e K2 estão ligados eletricamente em paralelo através de uma única saída segura. A medição de corrente e o teste da saída por impulso estão ativos neste c ircuito.
PARÂMETROS DAS ENTRADAS E SAÍDAS SEGURAS Carta de Entradas EL1904 (1º e 2º) Canal 1 – 1 – Ativar Ativar teste do sensor Canal 2 – 2 – Ativar Ativar teste do sensor Canal 3 – 3 – Ativar Ativar teste do sensor Canal 4 – 4 – Ativar Ativar teste do sensor Controlo logico do canal 1 e 2 Controlo logico do canal 3 e 4 Carta de Saídas EL2904 Ativar medição de corrente nas saídas Ativar teste de impulsos nas saídas
BLOCO FUNCIONAL DOS MODULOS DE SEGURANÇA
Configuração Sim Sim (1ª EL1904) ; não usado (2ª EL1904) Sim (1ª EL1904) ; não usado (2ª EL1904) Sim (1ª EL1904) ; não usado (2ª EL1904) Lógica simples Lógica simples
Configuração Sim no 1º canal Sim no 1º canal
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV.2 – Circuito com tapetes de segurança com com TwinSAFE (Safety mat and bumper ) IV-2.1 – TAPETE DE SEGURANÇA [ Function Block MON] MON] - Categoria 4 e PL=e Os tapetes ( mat ) ou os pára-choques ( bumper ) de segurança funcionam de acordo com o principio do circuito cruzado. Os contatos de superfície dos tapetes ou parachoques são ligados às à s entradas seguras do EL1904.A propriedade de “ teste de entradas” está ativa e os sinais são controlados para uma discrepância máxima de 200ms. Sempre que é detetado um cruzamento entre sinais (o tapete de segurança é pisado) um sinal logico “0” é sinalizado na entrada do EL1904. Se o cruzamento entre sinais não é detetado deteta do o sinal logico “1” é sinalizado na entrada. O loop de realimentação do estado dos contatores é feita através de uma entrada segura e o teste de entrada está ativo nesta entrada. Os contatores K1 e K2 estão ligados eletricamente em paralelo através de uma única saída segura. A medição de corrente e o teste da saída por impulso estão ativos neste circuito.
PARÂMETROS DAS ENTRADAS E SAÍDAS SEGURAS Carta de Entradas EL1904 Canal 1 – 1 – Ativar Ativar teste do sensor Canal 2 – 2 – Ativar Ativar teste do sensor Canal 3 – 3 – Ativar Ativar teste do sensor Canal 4 – 4 – Ativar Ativar teste do sensor Controlo logico do canal 1 e 2 Controlo logico do canal 3 e 4 Carta de Saídas EL2904 Ativar medição de corrente nas saídas Ativar teste de impulsos nas saídas
BLOCO FUNCIONAL DOS MODULOS DE SEGURANÇA
Configuração Sim Sim Sim Não usado Short cut is no module fault Lógica simples
Configuração Sim Sim
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV.3 – Circuito de scanners laser de segurança com com TwinSAFE (Laser scanner ) IV-3.1 – SCANNER LASER [ Function Block MON] MON] - Categoria 3 e PL=e Os scanners laser usados na segurança máquina possuem dois sinais de controlo designados por OSSD ( Output Signal Switching Device). Estes dois sinais especiais comutados, por motivo de segurança, estão ligados a duas entradas do EL1904. Nesta carta não podemos ativar o teste das entradas pois as saídas OSSD realizam os seus próprios testes através da comutação do sinal. Todavia T odavia estes sinais são testados, na carta EL1904, se existe uma discrepância superior a 200ms (indicação de falha). O loop de realimentação do estado dos contatores é feita através de uma entrada segura e o teste de entrada está ativo nesta entrada. Os contatores K1 e K2 estão ligados eletricamente em paralelo através de uma única saída segura. A medição de corrente e o teste da saída por impulso estão ativos neste circuito.
PARÂMETROS DAS ENTRADAS E SAÍDAS SEGURAS Carta de Entradas EL1904 Canal 1 – 1 – Ativar Ativar teste do sensor Canal 2 – 2 – Ativar Ativar teste do sensor Canal 3 – 3 – Ativar Ativar teste do sensor Canal 4 – 4 – Ativar Ativar teste do sensor Controlo logico do canal 1 e 2 Controlo logico do canal 3 e 4 Carta de Saídas EL2904 Ativar medição de corrente nas saídas Ativar teste de impulsos nas saídas
BLOCO FUNCIONAL DE SEGURANÇA
Configuração Não ativar Não ativar Sim Não usado OSSD arbitrary types of pulse Lógica simples
Configuração Sim no 1º canal Sim no 1º canal
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV.4 – Circuito de barreiras luminosas de segurança com TwinSAFE (Ligth curtain) IV-4.1 – BARREIRA LUMINOSA [ Function Block MON] MON] - Categoria 4 e PL=e As barreiras luminosas usadas na segurança máquina possuem dois sinais de controlo designados por OSSD ( Output Signal Switching Device). Estes dois sinais especiais comutados, por motivo de segurança, estão ligados a duas entradas do EL1904. Nesta carta não podemos ativar o teste das entradas pois as saídas OSSD realizam os seus próprios testes através da comutação do sinal. Todavia estes sinais são testados, na carta EL1904, se existe uma discrepância superior a 200ms (indicação de falha). O loop de realimentação do estado dos contatores é feita através de uma entrada segura e o teste de entrada está ativa nesta entrada. Os contatores K1 e K2 estão ligados eletricamente em paralelo através de uma única saída segura. A medição de corrente e o teste da saída por impulso estão ativos neste circuito.
PARÂMETROS DAS ENTRADAS E SAÍDAS SEGURAS Carta de Entradas EL1904 Canal 1 – 1 – Ativar Ativar teste do sensor Canal 2 – 2 – Ativar Ativar teste do sensor Canal 3 – 3 – Ativar Ativar teste do sensor
Configuração Não ativar Não ativar Sim
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV-4.2 – BARREIRA LUMINOSA ( Muting) [Function Block MUTING] MUTING] - Categoria 4 e PL=e As barreiras luminosas possuem dois sinais de controlo, designados por OSSD, que estão ligados a duas entradas do EL1904. Nesta carta não podemos ativar o teste das entradas pois as saídas OSSD realizam os seus próprios testes. Todavia estes sinais são testados, na carta EL1904, se existe uma discrepância superior a 200ms (indicação de falha). Os sinais do muting e de enable estão também ligados a entradas seguras numa segunda carta EL 1904.O loop de realimentação do estado dos contatores é feita através de uma entrada segura e o teste de entrada está ativo, nesta entrada. Os contatores K1 e K2 estão ligados eletricamente em paralelo através de uma única saída segura. O sinalizador luminoso de muting também está ligado a uma saída segura. A medição de corrente e o teste da saída por impulso estão ativos neste circuito.
PARÂMETROS DAS ENTRADAS E SAÍDAS SEGURAS Carta de Entradas EL1904 (1ª) Canal 1 e 2 – 2 – Ativar Ativar teste do sensor Canal 3 e 4 – 4 – Ativar Ativar teste do sensor Controlo logico do canal 1 e 2 Controlo logico do canal 3 e 4 Carta de Entradas EL1904 (2ª) Canal 1 e 2 – 2 – Ativar Ativar teste do sensor Canal 3 e 4 – 4 – Ativar Ativar teste do sensor Controlo logico do canal 1 e 2 / 3 e 4 Carta de Saídas EL2904
Configuração Não ativar Sim (3º canal) ; Sim (4º canal) Asynchronous evaluation OSSD OSSD Lógica simples
Configuração Sim Sim Lógica simples
Configuração
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV.5 – Circuito de portas de segurança com com TwinSAFE (Ligth curtain) IV-5.1 – PORTA DE SEGURANÇA (1ª) [ Function Block MON] MON] - Categoria 3 e PL=d As portas de segurança das máquinas usam uma combinação de contactos normalmente fechados (NF) e normalmente abertos (NA) ligadas a entradas seguras na carta EL1904. A propriedade de “ teste de entradas” está ativa e os sinais são controlados para uma discrepância máxima de 200ms. O loop de realimentação do estado dos contatores é feita através de uma entrada não segura em uma 2º EL1xxx e transferida para o TwinSAFE via programa no PLC. Os contatores K1 e K2 estão ligados em paralelo através de uma única saída segura. A medição de corrente e o teste da saída por impulso estão ativos neste circuito.
PARÂMETROS DAS ENTRADAS E SAÍDAS SEGURAS Carta de Entradas EL1904 Canal 1 – 1 – Ativar Ativar teste do sensor Canal 2 – 2 – Ativar Ativar teste do sensor Canal 3 – 3 – Ativar Ativar teste do sensor Canal 4 – 4 – Ativar Ativar teste do sensor
Configuração Sim Não usado Sim Não usado
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV-5.2 – PORTA DE SEGURANÇA (2ª) [ Function Block MON] MON] - Categoria 4 e PL=e As portas de segurança das máquinas usam uma combinação de contactos normalmente fechados (NF) e nor malmente abertos (NA) ligadas a entradas seguras na carta EL1904. A propriedade de “ teste de entradas” está ativa e os sinais são controlados para uma discrepância máxima de 200ms. O loop de realimentação do estado dos contatores é feita através de uma entrada segura em uma 2º EL1904. Os contatores K1 e K2 estão ligados em paralelo através de uma única saída segura. A medição de corrente e o teste da saída por impulso estão ativos neste circuito.
PARÂMETROS DAS ENTRADAS E SAÍDAS SEGURAS Carta de Entradas EL1904 (1º e 2º) Canal 1 – 1 – Ativar Ativar teste do sensor Canal 2 – 2 – Ativar Ativar teste do sensor Canal 3 – 3 – Ativar Ativar teste do sensor Canal 4 – 4 – Ativar Ativar teste do sensor Controlo logico do canal 1 e 2 Controlo logico do canal 3 e 4 Carta de Saídas EL2904
Configuração Sim ; Não usado (2º EL1904) Não usado (1º e 2º EL1904) Sim Não usado (1º e 2º EL1904) Lógica simples Lógica simples
Configuração
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV-5.3 – PORTA DE SEGURANÇA (com monitorização) - Categoria 4 e PL=e As portas de segurança das máquinas usam uma combinação de contactos normalmente fechados (NF) e abertos (NA) ligadas a entradas seguras. A propriedade de “teste de entradas” está ativa e os sinais são controlados para uma discrepância máxima de 200ms. Os fins de curso de indicação de zona S3 e S4 estão ligados a entradas seguras. Estes dois fins de curso indicam quando uma parte perigosa, de uma máquina, está e m uma posição segura e assi m poderá ser aberta a porta de segurança mesmo com a máquina em funcionamento. A propriedade de “ teste de entradas” nestas entradas está desativada devido aos sensores S3 e S4 serem alimentados a 24Vdc externo. Os contatores K1 e K2 estão ligados em paralelo através de uma única saída segura. A medição de corrente e o teste da saída por impulso estão ativos neste circuito.
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BRESIMAR AUTOMAÇÃO
Capítulo IV
BLOCO FUNCIONAL DE SEGURANÇA
IV-5.4 – PORTA DE SEGURANÇA (com encravamento) - Categoria 4 e PL=e A porta de segurança com encravamento eletromagnético tem dois sensores, S1 de “porta fechada” e S2 “porta fechada e encravada” , ligadOs a entradas seguras na carta EL1904. O teste de discrepância não pode estar ativo porq ue não há uma relação funcional dos sensores S1 e S2. O sinal de restart está está ligado a uma entrada segura do 1º EL1904. O loop de realimentação do estado dos contatores é feito através de uma entrada segura em uma 2º EL1904. As propriedades de “teste de entradas” de todas as entradas seguras estão est ão ativas. Os contatores K1 e K2 estão ligados em paralelo através de uma única saída segura. A medição de corrente e o teste da saída por impulso estão ativos neste circuito. O trinco do sistema de encravamento é comutado, via duas entradas seguras, enquanto o teste está ativo. A medição de corrente e o teste da saída por impulso estão ativos neste circuito do 2º EL2904.
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BRESIMAR AUTOMAÇÃO
Capítulo IV
PARÂMETROS DAS ENTRADAS E SAÍDAS SEGURAS Carta de Entradas EL1904 (1ª) Canal 1 – 1 – Ativar Ativar teste do sensor Canal 2 – 2 – Ativar Ativar teste do sensor Canal 3 – 3 – Ativar Ativar teste do sensor Canal 4 – 4 – Ativar Ativar teste do sensor Controlo logico do canal 1 e 2 Controlo logico do canal 3 e 4
Sim Não usado Sim Sim Lógica simples Lógica simples
Carta de Entradas EL1904 (2ª) Canal 1 – 1 – Ativar Ativar teste do sensor Canal 2 – 2 – Ativar Ativar teste do sensor Canal 3 – 3 – Ativar Ativar teste do sensor Canal 4 – 4 – Ativar Ativar teste do sensor Controlo logico do canal 1 e 2 Controlo logico do canal 3 e 4
Sim Sim Não usado Sim Lógica simples Lógica simples
Carta de Saídas EL2904 (1ª) – para K1 e K2 Ativar medição de corrente nas saídas Ativar teste de impulsos nas saídas Carta de Saídas EL2904 (2ª) – Trinco Ativar medição de corrente nas saídas Ativar teste de impulsos nas saídas
BLOCO FUNCIONAL DE SEGURANÇA
Configuração
Configuração
Configuração Sim Sim
Configuração Sim Sim
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV.6 – Circuito de paragem de emergência emergência com TwinSAFE (ESTOP ) IV-6.1 – BOTÃO DE EMERGENCIA (1ª) [ Function Block ESTOP] ESTOP] - Categoria 3 e PL=d Os botões de emergência são ligados, via dois contactos normalmente fechados normalmente fechados (NF), a duas entradas seguras na EL1904. A discrepância superior a 200ms, destes dois sinais NF na EL1904, é monitorizada no seu funcionamento. O loop de realimentação do estado dos contatores e o botão de restart é feito através de 2 entradas standard não não seguras. Os contatores K1 e K2 estão ligados ligados eletricamente em paralelo através de uma única saída saída segura. A medição de corrente e o teste da saída por impulso estão ativos neste circuito.
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV-6.2 – BOTÃO DE EMERGENCIA (2ª) [ Function Block ESTOP] ESTOP] - Categoria 3 e PL=d Os botões de emergência são ligados, via dois contactos normalmente fechados normalmente fechados (NF), a duas entradas seguras do EL1904. A discrepância superior a 200ms, destes dois sinais NF na EL1904, não é monitorizada. O loop de realimentação do estado dos contatores e o botão de restart é feito através de 2 entradas standard não não seguras. Os contatores K1 e K2 estão ligados eletricamente em paralelo através de uma única saída segura. A medição de corrente e o teste da saída por impulso estão ativos neste circuito.
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV-6.3 – BOTÃO DE EMERGENCIA (3ª) [ Function Block ESTOP] ESTOP] - Categoria 4 e PL=e Os botões de emergência são ligados, via dois contactos normalmente fechados normalmente fechados (NF), a duas entradas seguras do EL1904. A discrepância superior a 200ms, destes dois sinais NF na EL1904, é monitorizada tal como o teste às ligações às entradas. O loop de realimentação do estado dos contatores e o botão de restart é feito através de 2 entradas standard, não seguras, do PLC. Existe um bloco EDM que verifica se o sinal de realimentação assume o estado oposto, da saída do bloco ESTOP, dentro de um tempo ajustado. Os contatores K1 e K2 estão ligados eletricamente em paralelo através de uma única saída segura. A medição de corrente e o teste da saída por impulso estão ativos neste circuito.
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV-6.4 – BOTÃO DE EMERGENCIA (4ª) [ Function Block ESTOP] ESTOP] - Categoria 4 e PL=e Os botões de emergência são ligados, via dois contactos normalmente fechados normalmente fechados (NF), a duas entradas seguras do EL1904. A discrepância superior a 200ms, destes dois sinais NF na EL1904, é monitorizada tal como o teste às ligações às entradas. O loop de realimentação do estado dos contatores e o botão de restart é feito através de 2 entradas seguras ligadas a uma 2ª carta EL1904. Os contatores K1 e K2 estão ligados eletricamente em paralelo através de uma única saída segura. A medição de corrente e o teste da saída por impulso estão ativos neste circuito.
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV-6.5 – BOTÃO DE EMERGENCIA (5ª) [ Function Block ESTOP] ESTOP] - Categoria 4 e PL=e Os botões de emergência, são ligados via dois contactos normalmente fechados normalmente fechados (NF), a duas entradas seguras do EL1904. A discrepância superior a 200ms, destes dois sinais NF na EL1904, é monitorizada tal como o teste às ligações às entradas. O loop de realimentação do estado dos contatores e o botão de restart é feita através de 2 entradas seguras ligadas a uma 2ª carta EL1904. Os contatores K1 e K2 estão ligados eletricamente em duas saídas seguras. Ambos estão ligados ao ground . A medição de corrente esta desativada. Os testes da saída por impulso est ão ativos neste circuito.
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV-6.6 – BOTÃO DE EMERGENCIA (6ª) [ Function Block ESTOP] ESTOP] - Categoria 3 e PL=d Os botões de emergência são ligados, via dois contactos normalmente fechados normalmente fechados (NF), a duas entradas seguras do EL1904. A discrepância superior a 200ms, destes dois sinais NF na EL1904, é monitorizada tal como o teste às ligações às entradas. O loop de realimentação do estado dos contatores e o botão de restart é feito através de 2 entradas seguras ligadas a uma 2ª carta EL1904. Os contatores K1 e K2 estão ligados eletricamente em duas saídas seguras. Ambos estão ligados ao ground . A medição de corrente e o teste da saída por impulso estão desativados.
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BRESIMAR AUTOMAÇÃO
Capítulo IV
IV-6.7 – BOTÃO DE EMERGENCIA (7ª) [ Function Block ESTOP] ESTOP] - Categoria 4 e PL=e Os botões de emergência são ligados, via dois contactos normalmente fechados normalmente fechados (NF), a duas entradas seguras da 1ª carta EL1904. O loop de realimentação e o botão de restart estão ligados na 2ª carta EL1904. A discrepância superior a 200ms, dos sinais NF do botão de emergência, é monitorizada e o teste às ligações é desativado em ambos canais. Os contatores K1 e K2 estão ligados eletricamente em paralelo em uma saída segura. A medição de corrente e o teste da saída por impulso estão ativados.
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BRESIMAR AUTOMAÇÃO
Capítulo IV