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By the 1980s the idea of “lights-out” manufacturing had captured the imaginations of industrial engineers. The goal became factories automated to such an extent that the manufacturing floor would be void of humans and robots would manage the entire process. While this goal has not yet been realized, today's factory floors are home to a great deal of impressive automation. This includes, integrated manufacturing systems, smart sensors, high-speed information systems, cooperative robots, and the growing use of programmable automation controllers (PACs). Please explain the underlined part in your own words.