![]() ![]() 324 2005.6 A mechanical drum-operated sequencerswitch consists of a series of contacts thatare operated by pegs located on a motordriven drum. The pegs can be placed at predeterminedlocations around the circumference of thedrum to operate contacts.Mechanical DrumOperated Switch.7 When the drum is rotated, Microswitch®actuators that align with the pegs willclose or open the contacts of the Microswitch®, while the Microswitch® contactswhere there are no pegs will remain open. The presence of a peg can be thought ofas a logic ‘1’ or ON. Programmable Logic Controllers 3rd edition, Pg. A series ofleaf-spring-mounted contacts or micro switchesinteract with the cam so that, in different degreesof rotation of the cam, various contacts are closedand opened to energize and/or de-energize variouselectrical devices.Mechanical Cam-Operated SequencerPetruzella, Frank D.
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