Building PLC project. I have a homework and I don't find the subject.

Discussion in 'Homework Help' started by SeherMavi, Apr 8, 2016.

  1. SeherMavi

    Thread Starter New Member

    Apr 8, 2016
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    Hii All
    Firstly I'm sorry because my English is not so good. But, I will try to explain as much as possible. I have a homework and I don't find the subject. Following are the contents of my homework. I would be glad if you help.

    What to include in your project

    *At least 3 digital sensor
    *At least 3 digital output
    *At least 1 analog sensor
    *System or memory bite usage
    *Block-based programming (at least 2 function usage)

    Optional: (
    Your project must include at least one
    )

    • PID
    • HMI
    • Encoder (HSC)
    •Control PWM output
    *Control with analog output
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I suspect the OP is Not using PLC in the Industrial control meaning of the word.
    Many tend to also use PLC for any programmable controller such as PICmicro etc.
    For the Industrial PLC, that is quite a project if it is the first.
    Max.
     
  4. SeherMavi

    Thread Starter New Member

    Apr 8, 2016
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    Thanks a lot Bertus. But I know how to use the commands, I don't find the project. How can I write a project to contain them.
     
  5. SeherMavi

    Thread Starter New Member

    Apr 8, 2016
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    You're right Max. But we're at the initial level. So my teacher gave this homework. He wants to make sure we knew the PLC logic
     
  6. MaxHeadRoom

    Expert

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    Is any particular PLC specified?
    Max.
     
  7. SeherMavi

    Thread Starter New Member

    Apr 8, 2016
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    Ohh yes. I forgot to mention. SIEMENS s7 1200
     
    Last edited: Apr 8, 2016
  8. MaxHeadRoom

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  9. SeherMavi

    Thread Starter New Member

    Apr 8, 2016
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    Thank you for PDF. It will be very useful for me. Like you said, I have a test bed. But I think, I can't express my problem. I'm looking for a project not use of the PLC. I need an industrial project.
     
  10. Dyslexicbloke

    Active Member

    Sep 4, 2010
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    It sounds like a targeted task to me....
    I suspect you are expected to find an application that needs to measure something, not speed, like flow or more easily level.
    then
    Use a pid loop to drive a device, a pump perhaps, which is controlled with a PWM output.
    Since you loop is essentall going to output a rate requirement and your pump, lets assume its positive displacement, is not phase locked when driven with variable DC, PWM ypu will need to read its speed, to calculate its rate which is where the counter come in.

    To be fair that would be two loops but I guess thats kust extra credit...
    There litterally tbousand of situations whee this type of control could be applied but maintaining tbe mevel in a vessle is probably a reasonable choice.
    allarm the high and low levels, open and close the drain with a solanoid or two position actuator.. easy tou meet thevrequired IO count.

    My best advice, pick something real world that you understand or can visuallise the requirements of then you can concentrate on good code and implimentation as opposed to trying to understand some industrial process that is alian to you.
    Also think about how yoh will represent it with simple graphics... Essentally dont pick sometbing that is dificalt to visualise because that makes the HMI work hard.

    Al
     
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  11. MaxHeadRoom

    Expert

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    Keep in mind this project is via a industrial PLC ladder logic unit.
    Max.
     
  12. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    You could do something simple like temperature.
    You have 4 rooms.
    PLC is in Room 1, keep analog temperature sensor in Room 1. (1 analog sensor is used, check)
    Put one digital temperature in each of the remaining rooms, Room 2 gets 1 digital sensor, Room 3 gets 1 digital sensor, Room 4 gets 1 digital sensor. (3 digital sensors are used, check)
    The 3 digital outputs could be 3 fans. Or 2 fans and HMI.
     
  13. SeherMavi

    Thread Starter New Member

    Apr 8, 2016
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    Thanks for all your advice.
    Shtii01, I'm afraid, my teacher doesn't accept this project, he will think that is easy. Because we're not going to control the fan. We say 'work fan' and led will light. So we won't do project, we'll just write with TIA PORTAL and see in the test bed.

    Max, we are using ladder diagram, always :)

    And DyslexicBloke, I don't fully understand you because your sentences are too long :oops: But I think you say 'inspired by from what I saw around me and create a project. because industrial projects hard for me'. Is that correct?
    But I understand your project proposals. They are applicable. Thank you very much.
     
  14. Dyslexicbloke

    Active Member

    Sep 4, 2010
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    Sorry I didnt tbink about language...

    Choose a project that controls something you know well.

    Break the tas as a whole into small functional chunks.

    Produce ladder code that performs each small part of the task.

    Connect these modules, sets of rungs, to complete the overall task.

    It will help to draw it first as a functional block diagram.

    I do this for a living but my ladder code is long, complex and controlling hydroelectric generators.
    I expect you dont know much about hydro generation so it would be a poor choice of project.

    Al
     
  15. SeherMavi

    Thread Starter New Member

    Apr 8, 2016
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    Ohh DyslexicBloke, you are very good person :) I know how hydroelectric generators work. Can we do it this way:
    I pick up the hydroelectric generator for the project. And I'll try writing as I know. When I can't do, I''ll see your project. So my project will be more simple from your project. Maybe some parts never will be. If that's ok with you, we''ll do like this.
     
  16. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Now THAT's dedication!:p
    Max.
     
  17. SeherMavi

    Thread Starter New Member

    Apr 8, 2016
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    A superficial project will be enough. Are you teasing me Max :)
     
  18. MaxHeadRoom

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    Just when you said you would 'Pick one up' for the project I was envisioning the ones used near me.!
    [​IMG]

    Max.
     
  19. SeherMavi

    Thread Starter New Member

    Apr 8, 2016
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    It is a groupe turbine alternateur isn't it? You're exaggerating.
     
  20. MaxHeadRoom

    Expert

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    There is actually 15 hydro electric stations providing power where I live.;)
    Max.
     
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