Convert NI-9477 To 24V Sourcing Output

[JScherer]

I have an NI-9477 32-Channel (Sinking Output) module that I need to "convert," to a Sourcing Output. I understand I can do this through the knowledge article below:

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000YI7ICAW&l=en-US

I understand that I need to add "a 'Pull-Up' resistor between the output of the I/O to a voltage source."

Output With Pull Up

However, I don't know what that means physically. Are there any photos or more specific diagrams showing how to do this on a C Series module? 

Specifically, I want to convert all 32 inputs of the NI-9477 module:

1. What do I need to connect and to which pins?
2. Where do my digital inputs go in this new circuit?

9477 Pinout

[Bob_Schor]

Do you have a friend or colleague with any experience in Electrical Engineering?  Failing that, have you tried doing a Web search for "pull-up resistor"?  Either method should provide you with a better answer than we could give because you will know all the details of your task and can either (a) explain/show them to your colleague or (b) apply them while reading detailed descriptions and circuits found on the Web about this topic.

Bob Schor

[crossrulz]

I think I would just invest in a NI-9476, which is a sourcing Digital Output (has Vsup input as the voltage source for all of the outputs).

[JScherer]

Hey Bob, 

Unfortunately, I don't have such a person in our group. I'm familiar with a pull-up resistor, but I wanted to know if there's any NI specific documentation for using one with an NI-9477. Looking a little more online I found this circuit diagram which makes more sense to me:

https://cdn.sparkfun.com/assets/6/f/b/c/7/511568b6ce395f1b40000000.jpg

Construction:

If I understand correctly, I can use the same voltage source, but will need multiple resistors, each connected between VCC (my 24V Power Supply), and a digital input. Then the power supply GND will connect to the NI-9477 GND (Pin 28) So for the fist few inputs I would have
24V+ -> R1 -> DO0 (Pin 1) + Module Input 0

24V+ -> R2 -> DO1 (Pin 2) + Module Input 1

Operation:

As I understand, this circuit inverts the logic of the module so that the NI-9477 DO = TRUE will result in a False output. So I'll just need to invert the logic 1st.

[JScherer]

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@crossrulz wrote:

I think I would just invest in a NI-9476, which is a sourcing Digital Output (has Vsup input as the voltage source for all of the outputs).

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Normally, I would, but this is one of those projects with more time than funds. So I'm in a work with what I have situation. 

[RTSLVU]

 Here's some ideas on driving 24V devices with your DIO... 

[JScherer]

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@RTSLVU wrote:

 Here's some ideas on driving 24V devices with your DIO... 

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Thanks for the designs. However, these look more complicated than what the other diagram I posted looked like. Is what I posted earlier the "open collector," option? Is there a reason to use the MOSFET or Bipolar designs over this one?

[RTSLVU]

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@JScherer wrote:

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Thanks for the designs. However, these look more complicated than what the other diagram I posted looked like. Is what I posted earlier the "open collector," option? Is there a reason to use the MOSFET or Bipolar designs over this one?

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Well most common DIO devices can't handle that high of voltage directly and this is how to make them do it

[JScherer]

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@RTSLVU wrote:

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@JScherer wrote:

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Thanks for the designs. However, these look more complicated than what the other diagram I posted looked like. Is what I posted earlier the "open collector," option? Is there a reason to use the MOSFET or Bipolar designs over this one?

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Well most common DIO devices can't handle that high of voltage directly and this is how to make them do it

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Ok, Thank you for the clarification.

Just to make sure, the NI-9477 looks like it can handle up to 60V input:
https://www.ni.com/pdf/manuals/374182b_02.pdf 

For my case (24V) Will I be able handle the voltage directly?

Just want to make sure, again for my background: I'm an ME, pretending to be an EE 🙂

[GerdW]

Hi JS,

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@JScherer wrote:
Just to make sure, the NI-9477 looks like it can handle up to 60V input:
https://www.ni.com/pdf/manuals/374182b_02.pdf 

For my case (24V) Will I be able handle the voltage directly?

Just want to make sure, again for my background: I'm an ME, pretending to be an EE 🙂

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It does not "look like"!

It is specified to handle an external power supply of 0…60Vdc, and it is specified to be able to switch upto 1A per channel with a max of 20A for the whole module…