(TCO 2) Describe how PLCs detect whether a switch is open or
closed.
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Electrical Engineering
(TCO 2) Describe how PLCs detect whether a switch is open orclosed.
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The purpose of a PROGRAM LOGIC CONTROLLER PLC is to directlyreplace electromechanical relays and switches as logic elementsincluding a digital computer with a stored program and able toprovide the interconnection of many relays to perform certainlogical tasksA PLC has many input terminals by which it indicates highand low logical states from sensors and switchesIt also has many output terminals through which it outputshigh and low signals to the output connected
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