Ensayo cientifico

Pregunta No. 13

¿Que es un ensayo científico?

Es un texto en el cual se expone una serie de argumentos de ideas con tus propias palabras para explicar un razonamiento lógico y personal sobre untema científico concreto, basándose en bases científicas o demostradas.este ensayo servira para todas las personas que lo necesiten a aparecera por medio de esta pagina que es buenas tareas.com quees de gran ayuda para tos los estudiantes The PLC was invented in response to the needs of the American automotive manufacturing industry. Programmable logic controllers were initially adopted by theautomotive industry where software revision replaced the re-wiring of hard-wired control panels when production models changed.

Before the PLC, control, sequencing, and safety interlock logic formanufacturing automobiles was accomplished using hundreds or thousands of relays, cam timers, and drum sequencers and dedicated closed-loop controllers. The process for updating such facilities for theyearly model change-over was very time consuming and expensive, as electricians needed to individually rewire each and every relay.

In 1968 GM Hydramatic (the automatic transmission division ofGeneral Motors) issued a request for proposal for an electronic replacement for hard-wired relay systems. The winning proposal came from Bedford Associates of Bedford, Massachusetts. The first PLC,designated the 084 because it was Bedford Associates' eighty-fourth project, was the result. Bedford Associates started a new company dedicated to developing, manufacturing, selling, and servicing this newproduct: Modicon, which stood for MOdular DIgital CONtroller. One of the people who worked on that project was Dick Morley, who is considered to be the "father" of the PLC. The Modicon brand was soldin 1977 to Gould Electronics, and later acquired by German Company AEG and then by French Schneider Electric, the current owner.

One of the very first 084 models built is now on display at...