Dictionary
Logic Controls
Pure logic controls were historically implemented by electricians with networks of relays, and designed with a notation called ladder logic. Nowadays, most such systems are constructed with programmable logic controllers.
Logic controllers usually respond to switches or photoelectric cells, and cause the machinery to perform some operation. Logic systems are great for sequencing mechanical operations in places like elevators and factories, but notably poor at managing continuous process controls in such places as oil refineries and steel mills.
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