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Thread: Using A PLC with a carputer.

  1. #1
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    Using A PLC with a carputer.

    It dawned on me today in work while i was comissioning a new machine. It had 12v Mini PLC controllers. At 168 each. It had 8 dc inputs. Or 0-10v analogue.

    It only had 4 Outputs but the one i had was the basic model. A more advanced one had 24 Outputs.

    You could control the whole vehicle with a very simple Program. Ladder logic. Receiving inputs direct from the touch screen. To control Interior aircon, Mirrors, windows, anything that uses switches or dials.

    Has anyone attempted to control the Can-bus With a carputer?

    Am i just loosing the plot, Cause this is all ive thought about all day! And i can't see a real problem. Apart from the typical windows crashing or Load up times. Best thing with a PLC controller is that it doesnt need a computer to control some outputs. It'll stand alone Depending on how you've written the program.

    Should i go and Sit in the stupid corner? I've got a spare controller. Was surplus to requirements and i found it in my house earlier. How it got there i don't know!!
    Another quality post from Dyl.

  2. #2
    Maximum Bitrate JimmyFitz's Avatar
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    Quote Originally Posted by Dylan Jones
    It dawned on me today in work while i was comissioning a new machine. It had 12v Mini PLC controllers. At 168 each. It had 8 dc inputs. Or 0-10v analogue.

    It only had 4 Outputs but the one i had was the basic model. A more advanced one had 24 Outputs.

    You could control the whole vehicle with a very simple Program. Ladder logic. Receiving inputs direct from the touch screen. To control Interior aircon, Mirrors, windows, anything that uses switches or dials.

    Has anyone attempted to control the Can-bus With a carputer?

    Am i just loosing the plot, Cause this is all ive thought about all day! And i can't see a real problem. Apart from the typical windows crashing or Load up times. Best thing with a PLC controller is that it doesnt need a computer to control some outputs. It'll stand alone Depending on how you've written the program.

    Should i go and Sit in the stupid corner? I've got a spare controller. Was surplus to requirements and i found it in my house earlier. How it got there i don't know!!
    What PLC brand/model is it? Do you have the programming software too? I have a couple of old Siemens Logos that I haven't decided what to do with yet.
    ~Jimmy

  3. #3
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    I say go for it!

    Those of use who do not want to cough up 168 can try to improvise using PICs. The higher end versions actually support LIN and CAN, I think.

    It would be nice to see homebrew "car intelligence" systems that do not require a full blown PC/Mac solution with all the associated power requirements.

  4. #4
    Newbie mercD's Avatar
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    Im doing something similar with my car...
    I created a circuit board based off of a microcontroller that has 4 digital inputs, 3 of which can be analog 0-5v. And it has 8 outputs that I have running into 8 16Amp SPDT relays.
    I have the boards set up to recive commands from the PC via the serial line and they're modular so at the same time I made them easy to daisy chain. Meaning, I can string up a bunch of 'em and have them all talking amongst themselves... (think unlimited inputs and outputs) When it all comes together (this will be within a few weeks) I'll be able to control EVERY electrical aspect of my car with the PC or remotlely. I'm thankful my car has no network as it is an 85 mercedes that runs either off of analog circuitry or vacuume... And because the microcontrollers I'm using are so retardedly easy to program... A hardware guy like myself can do big things with this system... And they're small... 2.5 x 3.8 x 1.3 inches.
    Am I crazy? Good question...
    If I say no, would you believe me?

    2x 8" monitors, Athlon 3000+, 120gb HD, and 6K watts of 7.1 surround sound :) ...coming soon...

  5. #5
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    The controllers that were fitted were crouezt 12MRD with Alpha Micro software by Mitsubishi. They were pre programed by the designers of the machine, But we do have the software and rs232 cable for solving breakdowns later.

    I'm more used to using the Siemens S5 controllers and Telmequaniqe.

    Currentlly working with Proworx 32. Simple control software. With a more Expensive controller you could have 0-10v, 4-20, Whatever you need. But so far ive not seen one that works off 12v.

    What are PIC's then? Never heard of them?
    Another quality post from Dyl.

  6. #6
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    Quote Originally Posted by Dylan Jones
    What are PIC's then? Never heard of them?
    www.microchip.com

    Pros: Cheap. Common. Lots of code out there. Simple instruction set.

    Cons: Very limited especially in terms of RAM size and higher-level protocol support. Compilers (beyond assembly) can be expensive. Paged memory / addressing structure.

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