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Need Help With PLC's Assignment

  1. Nov 16, 2006 #1
    Here We Go. I have been asked to produce a program using GX Developer. The PLC i have to use is a Mitsubishi FX1N(C). I have to produce a program which will control a temperature sensitive fan heater in a hallway which leads to 2 adjacent rooms. The Heater and fan are designed to operate under the following conditions:

    Input the temperature from the two rooms in degrees celsius.

    Find the average temperature between both rooms

    Contert the temperature into degrees fahrenheit

    Compare the temperature to a preset value of 72 (+ or - 2.75%) so basically 70 - 74

    If the temperature is below 70 degrees F, then the fan and heater will operate and a 1.5 second flashing alarm will be energised until the temperature is increased to its pre-set value.

    If the temperature is above 74 degrees F, then the fan will operate and a 1 second flashing alarm will be energised until the temperature is increased to its pre-set value.

    If the temperature is between 70 and 74 degrees F then the fan and heater should be switched off.

    In addition, count the number of time the temperature has been outside of the pre-set range in a 2 hour (use 20 secs for this example). Indicate this ammount using BCD on the output display LED's
    ___________________________________________________________

    I have already started this program but was unable to finish and i dont own a PLC or a copy of GX Developer at home and I no longer have any lesson time on this. I know it is abit too much to ask but try and think of it as a challenge or a brainteaser. Heres what i have so far i have no idea if this is right or wrong: http://i63.photobucket.com/albums/h137/chriswall89/PLCsAssignment.jpg
    excuse the quality of this picture. I had to make the quality lower in order to upload the picture. If you need this then i will gladly email. If anyone does help either send me the file via email or post a picture of the ladder diagram please. Thanks in advance to anyone who helps or tries to help.
     
  2. jcsd
  3. Nov 16, 2006 #2

    chroot

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    We will not do your homework for you. If you are stuck, please ask a clear, concise question indicating where you are stuck and your thoughts on how to proceed, and we will try to help you.

    - Warren
     
  4. Nov 16, 2006 #3
    Ok sorry. Its not that im lazy and im asking other people to do this for me, I would love to do it myself if i had GX developer and a PLC because the only way to learn this is to try it yourself. But i have tried obviously to come up with the program but i cant tell where i am wrong or right without a PLC. If someone owns a PLC could they please try tell me where I am right, where I'm wrong and what else i need to do in order to finish the program.
    Or better still does anyone know if i could get a virtual PLC on the computer and where to get 1 please. I reckon i could probably find a copy of GX Developer somewhere myself. Thanks In Advance.
     
  5. Nov 16, 2006 #4

    chroot

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    Why does your school expect you to work with tools you do not have access to? Perhaps you should speak to your professor about it.

    - Warren
     
  6. Nov 16, 2006 #5
    That I dont know
     
  7. Nov 16, 2006 #6

    chroot

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    If you're supposed to be using a tool that you don't have, you should really be speaking to your professor, not to us.

    - Warren
     
  8. Nov 16, 2006 #7
    Ok I understand Thanks for you time anyway.
     
  9. Nov 16, 2006 #8

    Integral

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    Beyond what Chroot says, I find your ladder diagram illegible. If it were legible and well commented we could at least try to verify your logic.
     
  10. Nov 16, 2006 #9
    Ok,l thanks for looking i think im just going to take chroot's advice and request more time from the lecturer.
     
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