Kenfyoozed (Customer) asked a question.

March 12, 2021 at 6:40 AM
No output from Click PLC

I have a click plc c0-01dd-1d, I am not getting any output voltage from y1. I wrote a simple program to work with my c-more panel. On my panel I have a single switch named " Power Enable" - c101, and an indicator light named "Power ON"- y001. My program is c101----y001. When the switch is engaged on the panel, the indicator light on the panel lights up and the LED on the PCL at y1 lights up. I do not get any power output from y1. I need output from y1 to power a SSR. What did i do wrong or what do I need to check? Is my PLC bad?

 

 

  • 5 answers
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  • Kenfyoozed (Customer)

    I figured it out.... it helps to have the v+ and common wired up. I was under the impression that the power was supplied via the 24v in from the plc itself. After I wired the v+ and c3 I had proper output voltage. I apologize for the newbie mistake but I am just learning. At least It will now do what I need it to do.

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  • Kenfyoozed (Customer)

    I figured it out.... it helps to have the v+ and common wired up. I was under the impression that the power was supplied via the 24v in from the plc itself. After I wired the v+ and c3 I had proper output voltage. I apologize for the newbie mistake but I am just learning. At least It will now do what I need it to do.

    Selected as Best

  • kewakl (Customer)

     I was under the impression that the power was supplied via the 24v in from the plc itself.

     

    That is a common misconception. It is really a good thing that the PLC does NOT supply the power from its PSU, if you think about it.

    1. How much power can the PLC's PSU supply?
    2. What noise will be introduced into a power system by field devices?
    3. What noise will be introduced by incidental equipment in the immediate area?
    4. A failed I/O power system/failed device/failed output/failed output module should not take out your PLC/comms/scada/reporting.

    --Surely others will have more/better reasons than I have offered.

     

    Thanks for the follow-up.

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    • Bolt (Customer)

      I think we've all overlooked this once upon a time. Glad you figured it out in less than an hour.

       

      --Surely others will have more/better reasons than I have offered.

       

      I would say being able to have the outputs on a different voltage potential than the CPU is one of the biggest reasons to not power internally.

      Expand Post

  • Adisharr (Customer)

    I'm pretty sure everyone in this forum has made this mistake. I've made a lot of others but there's not enough storage space in the forum to list them all 😂

 

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