MB2 logic levels


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    Default MB2 logic levels

    I am upgrading a machine and have a MB2 on order. It looks like it is geared to 24V logic levels on its inputs. My home and limit switches are optical and can't handle above 12V. Does anybody know if inputs can be lower voltage by jumper selection? also, In the online docs I saw I did not see at what voltage inputs switch from logic 1 to 0.

    Anybody know?

    Thanks

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  2. #2
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    Default Re: MB2 logic levels

    Ok, let me try again:
    I am using an MB2. The specs indicate the inputs can be 5V or 24V. The manual shows a representative circuit of internal 24V feeding through the isolator diode then to a resister (value not indicated) then to the input terminal. When the input is high (no current flowing), the voltage at the input pin will be 24V which will not work with 5V solid state logic.

    How can you hook 5V solid state logic to the MB2 inputs.

    I have sent two requests to the manufacturer with no response.



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    Community Moderator Jim Dawson's Avatar
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    Default Re: MB2 logic levels

    In looking at the user manual, the inputs are rated at 5 to 24VDC (rather than 5 or 24 V), this is a pretty common industrial input. The inputs are completely isolated from the 24V board power, so you will use an external 5V supply.



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    Community Moderator ger21's Avatar
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    Default Re: MB2 logic levels

    I have sent two requests to the manufacturer with no response.
    Hmmm, he's responded to my questions within a day or so.
    Mine shipped on 11/29/16, and no sign of it yet. Not sure how long it's going to take to get here.

    In looking at the user manual, the inputs are rated at 5 to 24VDC (rather than 5 or 24 V), this is a pretty common industrial input. The inputs are completely isolated from the 24V board power, so you will use an external 5V supply.
    Is that only for the 5 PNP inputs, or for all of them?

    Gerry

    UCCNC 2017 Screenset
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    Default Re: MB2 logic levels

    For the NPN inputs, the manual implies that the pull up voltage is onboard the MB2 and is 24V. So, when the input is in the "off" state, the voltage seen at the input pin will be 24V. The outputs for my optical switches for limit an home are rated at 16V max. Am I missing something?

    You can only have so many pins on the board, but I would sure like to be able to select or at least source the pull up voltage value on an optical input.



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    Default Re: MB2 logic levels

    My guess is your machine has Optocouplers on the board and they can handle a range of voltage from 5 to 24V. Look at the board closely but normally 24V logic is designed so you can have a higher input voltage on sensors like 24V and the other side of the optocoupler is tied to 5VDC so all the voltage going to the logic is limited to 5V or slightly lower. Take a photo of your controller board this is pretty easy to spot.

    Russ



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    Community Moderator Jim Dawson's Avatar
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    Default Re: MB2 logic levels

    Quote Originally Posted by ger21 View Post

    Is that only for the 5 PNP inputs, or for all of them?
    In looking at the manual again, it does look like the PNP inputs are the only ones that are isolated out of the box. If the optical sensor is a PNP output, it should be able to connect to the input. It also looks like the board might be able to be modified to isolate all of the inputs, I'm still trying to understand all of the user manual. They reference solder jumpers for modifications, still trying to wade through that.

    I would like to see a link or a part number for the optical sensors. There should be a way to connect it.



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    Default Re: MB2 logic levels

    pages 10,11 in the manual show typical NPN inputs and PNP inputs pretty clear. The most common type sensors are proximity sensors or optical sensors, however you can use plain Jane micro switches as well.


    http://warp9td.com/images/BOB_Vendor...nual%20E12.pdf



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    Default Re: MB2 logic levels

    There's a more current manual here:
    http://www.cncroom.com/downloads/MB2...al%20E16R4.pdf

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
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    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: MB2 logic levels

    WOW,
    I really like the MachBob2 board, did not even know it existed. I have the ESS and ended up making three custom boards to handle optical homing sensors, Balluff proximity sensors used for limits, and a differential driver board since my servo amps like differential drivers. They did a nice job on that board. I also have the CNC4PC C25 board which is pretty cheap and does not give you access to the third parallel port. I will probably have to pick up one of these units.

    Russ



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    Default Re: MB2 logic levels

    Yeah, I don't think anyone had ever heard of them until recently. Someone sent me a link on the UCCNC forum, and I've been spreading the word a little. I'm using mine with a UC300ETH and UCCNC.
    It appears that shipping takes quite a while, but the price is reasonable, $20.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: MB2 logic levels

    Looks like the board costs $140 from cncroom.com, did not see any USA sellers on ebay. This does look like a nice clean board. Anyone else buy one of these units?

    Russ



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    Community Moderator ger21's Avatar
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    Default Re: MB2 logic levels

    I bought it from CNC Room, $140 + $18 for shipping to Michigan, apparently on a slow boat.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  14. #14
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    Default Re: MB2 logic levels

    Thanks for sharing. I think I will order one, this does pretty much exactly what all my three boards do, and I designed mine in Eagle and then used PCBgCODE to get the gcode to cut them on my CNC. They work fine but I like all the LED inputs for each input and output and their board has plated through holes and appears to be well done. Thailand is know for some high quality shops, we actually have some of our RF boards manufactured in Thailand. I guess I will have to wait on the slow boat.

    Russ



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    Default Re: MB2 logic levels

    I didn't see it indicated in the order information but typical shipping to the US is 4 weeks. I paid an extra $28 to get 5 day FEDEX. Should get it next week.



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    Default Re: MB2 logic levels

    I should have realized how long it would take. My wife ships Christmas gifts to her family in Canada, and that takes two weeks or more. And we live 30 minutes from Canada!. So I can see that coming from Thailand would take a bit longer.
    No reason for me to pay extra, as I don't even have a machine to use it on yet.


    Here's a video of the boards being assembled.


    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: MB2 logic levels

    I ordered one of these last night, it said four weeks for delivery to the USA for $18.58, then in the middle of the night they sent me an additional invoice for $28 to upgrade FEDEX. I did not see this invoice until this morning so since I did not respond at 4am they cancelled the invoice and sent regular parcel post. They should have had a button on their checkout that offered FEDEX with the price. Anyway not a big deal will be pretty busy over the holidays anyway.

    Russ



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    Default Re: MB2 logic levels

    You can modify the MB2 to use a voltage different than 24vdc. The 18 to 24vdc supply goes to a DC/DC converter to generate 5v. You can disable that converter and use external 5v supply. Then you can hook up say a 12v supply to the 24vdc terminals on the MB2.

    I have been working with my board for the last several days

    Russ



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    Community Moderator ger21's Avatar
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    Default Re: MB2 logic levels

    How did you get it so fast, if you didn't pay for Fedex?

    Mine shipped on 11/29, and just got to NY on 12/31. Cleared customs yesterday, and is finally on the way here.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  20. #20
    Community Moderator ger21's Avatar
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    Default Re: MB2 logic levels

    Do you know if the Charge Pump output at Y114 just passes the 5V charge pump signal through the board?

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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