Relay Logic Clock Signal

Discussion in 'General Electronics Chat' started by scoobydoo, Nov 25, 2013.

  1. scoobydoo

    Thread Starter New Member

    Nov 25, 2013
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    I'm trying to solve a problem for school by converting a state diagram to a logic circuit then converting that to ladder logic. I've already solved the problem by brute force, but I want to develop a systematic approach. My labs will be only be getting more complex. Of course as I go beyond 6 inputs then I will automate the process using matlab.

    The process is fairly clear if not that easy to do. I've been following this guide:

    http://faculty.etsu.edu/tarnoff/ntes2150/statemac/statemac.htm

    I end up with a circuit using D flip-flops. However, its never explained where the clock signal comes from. How do I implement a clock signal using relay logic?

    I think the answer is on this page, but I don;t get it:

    http://www.allaboutcircuits.com/vol_4/chpt_10/5.html

    Thanks, Scooby
     
  2. strantor

    AAC Fanatic!

    Oct 3, 2010
    4,302
    1,988
    You use a timer relay. Timer relays come in many varieties; some delay closing after a signal is applied, some delay open after signal is removed, some generate a pulse when signal is applied, etc. Some contain electronic circuits to handle the timing, some use a pneumatic cylinder with orifice valve to control timing.
     
  3. scoobydoo

    Thread Starter New Member

    Nov 25, 2013
    8
    1
    [​IMG]

    But the timer implements an edge detector, its not the clock itself. I'm assuming that if you hooked up a normally open push button in place of the C contact then that could be your clock signal. I guess I've been thinking of the clock as synchronous whereas the real world processes are asynchronous.

    I'm going to work on that now. I'll post updates as I go along.
     
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