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Homework Help: Relay Ladder Logic Problem

  1. Feb 1, 2010 #1
    I don't even know if this post is in the right place but I'm going to give it a shot anyways. I am supposed to draw a ladder diagram that controls L1, L2, and L3. L1 is supposed to come on the first time the start button is pushed. The second time the start button is pushed, L1 and L2 are supposed to come. L1, L2, and L3 are all supposed to come the third time the start button is pushed. The stop button is supposed to reset the circuit so you could do it all over again. I have 6 relays I can use to make this work. Below is the paper with instructions and materials I have. Does anybody have any help/solutions to this problem? Any thing would be greatly appreciated.

    Attached Files:

  2. jcsd
  3. Feb 4, 2010 #2
    For me it is not obvious what kind of relays do you have. Latched? Normally open? Normally closed?

    After figuring it out, I would assign each lamps to a relay, draw a state diagram and determine the logical relationship between state variables (state of relays and buttons) and relay inputs.
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