ASSE ’ S HISTORY ASSE & ANSI Standards D PAGE 19 AWARDS Joel Haight
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چکیده
M achinery controls have evolved from simple hardware circuits to ever more complex hardware and software systems. Although still used, relays have been supplanted by programmable logic controllers (PLCs) and more recently safety-rated PLCs. Control systems use increasingly sophisticated complex integrated circuits, microprocessors and firmware. This has allowed great advancements in many respects The term control reliability has been used in the U.S. for several years, but its meaning is unclear. For a complete Table of
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تاریخ انتشار 2013