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    One Rung Relay Ladder Diagram

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    It is desired to control the coil of a relay CR4 using relay contacts CR1, CR2, and CR3. CR4 is to be ON whenever a majority of CR1, CR2, and CR3 are ON (i.e. any two or all three). Draw a one-rung relay ladder diagram that will produce the logical operation.

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    Since there are three possibilities to turn on the majority of the ...

    Solution Summary

    The solution draws a one-rung relay ladder diagram to control the contacts. Logical operations are analyzed.