A Fresh Engineer (Customer) asked a question.

Edited March 9, 2023 at 6:46 PM
What click PLC would you recommend with these input and output devices?

So, I just completed my project cost estimation and am ready to order parts. The last step of the process is to pick the correct click plc. I already have the click C0-12DRE-1-D picked out, but before ordering I want to make sure that its the correct one to get.

I have 1 Analog input 4-20mA (pressure transmitter), 1 Analog output 4-20mA (pressure transducer current to pneumatic), and 2 24VDC discreet outputs (both are solenoid valves)

I just want to make sure that I have the correct PLC that can talk to all of these devices. I am not sure why people told me I should try to avoid using relay outputs for the 2 solenoid valves.

If anyone could help me find the right plc that would be great, let me know if my PLC that I picked out will work completely fine.

  • 14 answers
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  • ADC Community_02 (Automationdirect.com)

    If you reference the wiring diagram printed on the side you will see you can wire either as a Normally Closed (pins 11 & 12) or Normally Open contact (pins 11* & 14).

    image*Note: Edit normally open pin from 12 to 11.

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  • RBPLC (Customer)

    That PLC will work but you'll want to use interposing relays to switch the solenoids. That's probably what they mean by not using relays directly off of the PLC. This is common practice so in the event that the relay fails, it can easily be replaced with a spare.

     

    Edit: Make sure you've got the power supply as well.

    • A Fresh Engineer (Customer)

      Could you recommend me a specific type of interposing relay that would work well with a click PLC? Relay Output Module: 4-pt, 6-24 VDC/6-240 VAC (PN# C0-04TRS-10) | AutomationDirect, this one has a max output of 24VDC, and 2 of my solenoid valves are 24VDC this one would work correctly with them, right? Are there any better ones that can be replaced more easily than this click add-on? My pressure transducer is the last output which is analog, so it will connect to the current output on the click C0-12DRE-1-D PLC

       

       

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  • Durallymax (Customer)

    That one will work, keep in mind you can also get a C2-01CPU with a C2-08D2-6C for about $78 less and have the features of the CLICK+ if needed. You will lose the RS485 port, if you need that you'd need the C2-03CPU and then you'd be about $34 higher in cost.

     

    Use the discrete outputs to run interposing relays. Easier/cheaper to replace an interpose relay than the PLC itself when the relays wear out.

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    • A Fresh Engineer (Customer)

      Could you recommend me any cheap interposing relays that are easy to replace for my 2 solenoid valves? Would it be better to buy the C0-04TRS-10 stackable i/o relay module or is there a cheaper alternative that is easier to replace? I don't expect it to break that often, and for what it's worth, spending another 60 dollars is not going to be a dealbreaker for me. Let me know if there is an easier alternative interposing relay.

       

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      • A Fresh Engineer (Customer)

        How does the discrete output on the PLC and solenoid valve wire to this relay? I have never seen this type of relay before, so I don't understand how I would install it with my solenoid valves and into the click. Is there any website or video that will explain more about this. I will just order 3 of these relays now, I am sure they will work I just need to figure out how to connect them to the PLC and the solenoid valve. Why is there 3 output contacts on the relay? I understand 2 for the input contacts +,- but not the output contacts on the relay?

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      • Durallymax (Customer)

        PLC output to A1

        24 Com to A2

        Solenoid source to 11

        Solenoid wire to 14

      • ADC Community_02 (Automationdirect.com)

        If you reference the wiring diagram printed on the side you will see you can wire either as a Normally Closed (pins 11 & 12) or Normally Open contact (pins 11* & 14).

        image*Note: Edit normally open pin from 12 to 11.

        Expand Post
        Selected as Best

      • A Fresh Engineer (Customer)

        If my valve is normally open (de-energized) would I need to get a normally open interface relay also? When is a signal sent to open the valve the relay closes and lets power thought to the solenoid valve, when there is no power the relay is open, which means the valve is closed (no-power)

      • ADC Community_02 (Automationdirect.com)

        That's the good thing about a relay you can wire it normally open and if you don't get the correct result then just switch one wire and make it normally closed.

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