1. *** New version of B4J is available ***
    B4J v7.8
    Dismiss Notice

Other PLC-optocoupler-3wire_sensor

Discussion in 'B4R Questions' started by Tayfur, Aug 6, 2019.

  1. Tayfur

    Tayfur Well-Known Member Licensed User

    Normaamly cınnecftion reading 24Volt(Right side) .its normal.

    But .I connected Optocubler board like under below. Iam reaading A-B points 12Volt.
    Why reduce voltage. This is problem for PLC.

    How can i fix? What/where is problem.

    I am not Elektroinc tech. Please explane simple. Thanks.
    upload_2019-8-6_15-49-17.png upload_2019-8-6_15-57-50.png

    upload_2019-8-6_15-49-17.png
     
    Last edited: Aug 6, 2019
  2. tigrot

    tigrot Well-Known Member Licensed User

    it looks like tou created a resistor divider. I don't have internal schematic, so I can only guess... I think the input inpedence of plc is quite low.
     
  3. Tayfur

    Tayfur Well-Known Member Licensed User


    This schematic is OPTOCUPLER Board
    View attachment 82904
     
  4. tigrot

    tigrot Well-Known Member Licensed User

    Any info about plc input impedence?
     
  5. f0raster0

    f0raster0 Active Member Licensed User

  6. Tayfur

    Tayfur Well-Known Member Licensed User

    Sorry;I think optocoubler borad.

    I found now PLC

    upload_2019-8-7_8-33-38.png
     
  7. tigrot

    tigrot Well-Known Member Licensed User

    Short 3k resistor on output. The input impedance is high enough.
     
  8. Tayfur

    Tayfur Well-Known Member Licensed User

    Thak you for support @tigrot
    What could be the solution to the problem?
    Where do I place resistance/diod.. etc? Can you show me the diagram above?
     
  9. tigrot

    tigrot Well-Known Member Licensed User

    Short resistor 3K at left of diagram .
     
  10. Tayfur

    Tayfur Well-Known Member Licensed User


    Which locaiton 1-2-3-4-5 for 3Kohm?

    Can I use 4,7Kohm resistor for alternaitve? its now ready.
    upload_2019-8-7_14-59-27.png
     
    Last edited: Aug 7, 2019
  11. tigrot

    tigrot Well-Known Member Licensed User

    One more question: type of pnp sensor?
     
  12. Tayfur

    Tayfur Well-Known Member Licensed User

    PNP
    DC 10-30V
    Sn:8mm
    Ia:200ma
     
  13. Tayfur

    Tayfur Well-Known Member Licensed User

    a friend told me, PLC electrical power may not be enough.
    all 24v Sensors (for all input divice source is PLC output for 24V. (like Red wire)

    is it possible???
     
  14. tigrot

    tigrot Well-Known Member Licensed User

    Use an external source. The device should not sink more than 3mA at 24 V. Is sensor able to work at 24 V? I don't have any info
     
    Last edited: Aug 8, 2019
  15. tigrot

    tigrot Well-Known Member Licensed User

    Connection 5 is X4 input of PLC?
     
  16. tigrot

    tigrot Well-Known Member Licensed User

    Did you connect S/S pin according use? Seems quite important for input handling, according user's manual of plc.
     
  17. Tayfur

    Tayfur Well-Known Member Licensed User

    sorry my late anser. (national holiday)

    I tried External power source. its not changed.

    Sensors : DC10...30V
    Ia:200mA
     
  18. Tayfur

    Tayfur Well-Known Member Licensed User

    Yes. PLC connected with X4
     
  19. Tayfur

    Tayfur Well-Known Member Licensed User

    Yes. We cheked.
    İts (S/S) connectted directly 24V on PLC

    Thank you for Helps @tigrot
     
  20. tigrot

    tigrot Well-Known Member Licensed User

    Hi. What happens if you disconnect 1? And 5?
     
Loading...
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice