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| Reprinted From Feb. 2001 Issue of
Control Engineering Magazine
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| How time flies |
With Jim Spencer, Lipten Company General Manager
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How time flies: Early PLCs’ only function was to manipulate relays wired to its discrete inputs. (See CE, Oct. 1995, "The Evolution of PLC-Based Loop Control," p. 57.) Thirty years later, they remain a steadfast and growing component to various industries. Jim Spencer, general manager for Lipten, a power generation company based in Wixom, Mich., says, "PLCs fit the bill of replacing single-loop controllers. They provide flexibility to do all data acquisition, assist the DCS without high cost, are popular within other industries which, gives allowance to a greater familiarity among customers." Along with flexibility, speed has become another important development in PLC and I/O technology.
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