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  1. #1
    Join Date
    26.02.2015
    Posts
    19

    Default SR-Flipflop Not behaving as Expected

    I set up a programmable logic gate to do the following:

    - Stop the main circulation pump when water level in sump went down to lower level sensor (sensor 2)
    - Keep the main circulation off until I manually started it by setting Maintenance 3 ON.
    - Use SR-Flipflop with the SET trigger being the water level reaching sensor 2 and RESET trigger being Maintenance 3 going on
    My function works perfectly until Maintenance 3 turns OFF again (either manually or due to max on time)

    When Maintenance 3 turns off the main circulation stops. The logic is correctly turning the circulation pump on with the leading edge of the reset trigger (Maint 3 ON) but is then also responding to the trailing edge of the reset trigger (Maint 3 Off).

    Below is a graphic of what is happening and included at the bottom is what should be happening according to the Programmable Logic manual

    LowSumpTriggerFunction.jpg
    Last edited by SteveAtkins; 22.10.2015 at 23:29.

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