HOME › Forums › Input/Output › EZIOxx › EZIO4O – Making relays exclusive

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  • Anonymous
    Inactive
    June 28, 2012 at 3:31 pm
    Post count: 5
    #40341

    Is it possible to mark two relays on an EZIO4O as mutually exclusive? As in, turning one on turns the other off? I have an application where two should never be on together. I am controlling with an ISY and do have the programs set to turn one off before turning the other on, but I’d like to create a fail-safe by marking them that way within the module. Is this possible?

    Thanks!!

    Anonymous
    Inactive
    June 28, 2012 at 5:32 pm
    Post count: 146
    #43833

    Hello Chris,

    Unfortunately, there is no way to set up the relays to be mutually exclusive. If you can let us know what you are connecting, perhaps there is a way you can use the normally open vs normally closed to accomplish your goals…as in when you send an ON command the normally open side turns off and the normally closed side turns on. Assuming both loads can be powered by the same power supply.

    Edit – Should clarify, with the ISY…it’s not really possible. Lee is correct regarding snap shot mode, but you would need to modify the link record (responder link from the ISY’s PLM) in the EZIO4O…which can be done using the SHN Utility Suite.

    Anonymous
    Inactive
    June 28, 2012 at 5:37 pm
    Post count: 1001
    #43834

    The EZIOxx has the capability to react that way using a Scene to turn On a pattern of relays but it cannot be configured using the ISY.

    Refer to the EZIO4O Quick Start Guide under linking a “status snapshot”.

    Anonymous
    Inactive
    June 28, 2012 at 5:56 pm
    Post count: 5
    #43835

    Edit: See below, I posted the totally wrong project. 🙄

    Anonymous
    Inactive
    June 28, 2012 at 7:33 pm
    Post count: 146
    #43836

    Hi again,

    Would this work?…

    When Relay 2 is OFF – 50% pool / 50% waterfall
    When Relay 1 & 2 are ON – 100% waterfall (turn relay 1 on before relay 2)
    When 2 is ON – 100% Pool

    Note: this image shows terminal configurations for the EZIO8SA.

    Anonymous
    Inactive
    June 29, 2012 at 1:40 pm
    Post count: 5
    #43837

    Wow, I was having some kind of moment when I posted that. I combined two different things I’m doing into one post – sorry about that! The waterfall is actually being handled by an EZFlora (it requires the 24v to drive the actuators), so it’s not an issue since it can only have one of the valves on at a time. That’s working perfectly.

    What I’m ACTUALLY trying to accomplish with the EZIO4O is the heater, much simpler. Basically, I’m trying to be able to turn on only one of two settings, POOL or SPA. It’s a very simple connection, one common, one for spa, one for pool. They are NO connections. One should never be closed without the other being open.

    The way I’m thinking I’ll do it is with ISY programs. Triggering either will run a program that queries the opposite one, if it’s on (THEN clause) turns it off, then queries it again and reruns the program to ensure it actually turned off, and if it’s off (the ELSE) then turns the requested one on. It seems like a reasonable solution, I think. Unless you see any reason that’s a bad idea. 🙂

    Sorry for the mixup earlier, thanks for the reply!

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