Logic Control
Logic control systems for industrial and commercial machinery were historically implemented at mains voltage using interconnected relays, designed using ladder logic. Today, most such systems are constructed with programmable logic controllers (PLCs) or microcontrollers. The notation of ladder logic is still in use as a programming idiom for PLCs.
Logic controllers may respond to switches, light sensors, pressure switches, etc., and can cause the machinery to start and stop various operations. Logic systems are used to sequence mechanical operations in many applications. PLC software can be written in many different ways – ladder diagrams, SFC – sequential function charts or in language terms known as statement lists.
Examples include elevators, washing machines and other systems with interrelated stop-go operations.
Logic systems are quite easy to design, and can handle very complex operations. Some aspects of logic system design make use of Boolean logic.
Read more about this topic: Control System
Famous quotes containing the words logic and/or control:
“There is no morality by instinct.... There is no social salvationin the endwithout taking thought; without mastery of logic and application of logic to human experience.”
—Katharine Fullerton Gerould (18791944)
“... the black girls didnt get these pills because their black ministers were up on the pulpit saying that birth control pills were black genocide. What Im saying is that black men have exploited black women.... They didnt want them to have any choice about their reproductive health. And if you cant control your reproduction, you cant control your life.”
—Joycelyn Elders (b. 1933)