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Power Supplies and PLC IO

Discussion in 'General Electronics Discussion' started by Harold Grimm, Nov 2, 2017.

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  1. Harold Grimm

    Harold Grimm

    Nov 1, 2017
    I am in the integrations business. I am designing a new system to replace an old system. In the old system there are 12VDC relays to be controlled by the new PLC. The output modules can operate at both 12VDC and 24VDC. The modules are sinking transistor outputs. Manufactured by Omron. The part number CJ1W-OD261.
    My question is this, with both a 12VDC and 24VDC power supply with common negatives, can we use both power supplies for the relays.
    I have attached a drawing that shows a very simple representation of what I plan to do. I inserted a diode in the positive of both supplies to prevent any cross connecting.
    If you have any comments please let me know.

    Attached Files:

  2. kellys_eye


    Jun 25, 2010
    The diodes are unnecessary.

    Can we assume that the 'out15' connections are wired the same as the 'out00' terminals i.e. driven from open drain connections?

    If so then the relays can be powered by 12/24V as you show in your drawing.
  3. Minder


    Apr 24, 2015
    As they appear to be open collector/drain outputs then you should have no problem common'ing up the negative side of the supplies.
  4. Harold Grimm

    Harold Grimm

    Nov 1, 2017
    Thank You for the speedy reply. Yes all of the outputs are from similar circuits.
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