For the conventional type of sequence programs, it comprises of the control circuits by combining relays, counters, timers and other parts. When the sequence programs are very complicated, the number of required parts increases, and a large amount of space is required.
Programmable controllers have a built-in microcomputer that runs at high-speed in place of numerous relays and timers, and are devices dedicated to sequence control that have been developed for the purpose of reducing the space occupied by control devices.
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