Todd Dice (Customer) asked a question.

Edited December 13, 2020 at 11:25 PM
Cmore Micro EA3-S3ML-R to Click output.

I don't have the hardware, otherwise I'd test this.

 

I have a Cmore Micro EA3-S3ML-R communicating to a Click C0-10DRE-D. Programmed into the Click is code to trigger the outputs. In the HMI, I will have a few test screens where I wish to manually fire the output(s) via a momentary PB in the Cmore. My question is, can the PBs in the Cmore reference the output addresses directly, or must I program additional code into the Click, and the PB addressed to a C-bit?

 

I just wonder if the Click will override PB force of output ON, when logically, the PLC has the output OFF.

  • 6 answers
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  • kewakl (Customer)

    I'm sure that the CMore Micro can access the outputs, but I think that ladder code will win!

    If the outputs are of the OUT variant, then the outputs shall follow the state of the rung conditionals.

    If the outputs are of the SET/RESET variant, then your PBs ,may work, but I would guess -- rather unreliably.

     

  • Garry (Customer)

    +1 kewakl

    The C-More Micro will control the outputs directly as long as they are not being controlled by the PLC program.

    I prefer to use the momentary Pushbuttons option and do all of the control logic in the PLC.

    Regards,

    Garry

     

    https://accautomation.ca/series/c-more-micro-hmi/

     

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    • kewakl (Customer)

      I have had the opposite experience. I like Set ON pushbuttons and have PLC reset the bit when the trigger/event is handled.

      My first real HMI was the (?1990s) Total Control Products QuickPanel family. One version of the firmware (may be the initial offering) had a problem that the 'release' of a momentary pushbutton occasionally was not transmitted. -- admittedly a historical anomaly! I got into the habit of using the SET ON property for pushbuttons.

       

      I also have seen comms fails that would inhibit the release of a MOMentary press.

       

      Experiment: Press/hold a MOMentary button, then unplug the comms cable/remove power from ethernet switch. I realize that this is an edge/corner case, but it is not invalid. I have seen the CMore Micro (EA3 iirc) 'fail to recover' from this.

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      • Garry (Customer)

        I see your point kewakl. I've often used the momentary PB on the screen with an edge trigger. This is great for switching things on/off with just one button.

        Just like your scenario, what happens when the touch screen fails and the pushbutton is always sending the ON signal.

        In either case, you would have to account for the comms or touch screen failing.

        Regards.

        Garry

         

        Expand Post

      • David_H (Customer)

        I still have that problem occasionally with hmi's powered by FactoryTalk View...

         

        For most push buttons, the vendor programmed it exactly as you described. However, there's a couple of exceptions that give problems once in a while...

  • Todd Dice (Customer)

    Thanks everyone. I'll just program the PBs into the PLC code; no biggie. I just thought there could be a work around to avoid it. 😁

 

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