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NI 9203

NI 9203

Hi,

I am having a problem in connection of NPN hall effect sensor 24VDC 25mA to NI9203

 (http://ie.rs-online.com/web/p/products/7659321/?cm_mmc=IE-PPC-_-google-_-3_IE_EN_BM_A_and_C_Exact-_-...

Could not get an output in Labview graph.

Any ideas or wiring suggestions.

 

Cheers,

Zilvinas

 

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Re: NI 9203

[ Edited ]

You have a 20mA analog current input modul, and a NPN (open collector) digital  output sensor.

 

You need a power supply (5-24V) and a pull up resistor.

Power the sensor, share the COM with the 9203, connect the sensor output to a AI and add a pull up resistor of

R= U_supply/20mA ~ 1.2kOhm  

(well, missed the input burden resistor .. R= U_supply/20mA -138 Smiley Wink )

from AI to the powersupply of the sensor.

The sensor output will 'shortcut' the current to ~0mA , if you want to make it ~ 4mA add another resistor of ~20 Ohm between sensor output and AI (keep the pull up between AI and U-supply).

 

Greetings from Germany
Henrik

LV since v3.1

“ground” is a convenient fantasy

'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'


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Re: NI 9203

Thanks Henrik,

 

There are 2 resistors inside 9203 already(see picture attached). Does it required additional resistor?

9203.jpg

Regards,

Zilvinas

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Re: NI 9203

[ Edited ]

No, there are 8 resistors with 138Ohm, each channel has one to measure the current Smiley Wink

 

here is a quick draft:

NPNsensorto20mA.png

 

R3 = 1.2k limit the current to ~20mA (~17.94mA) , this resistor dissipates ~0.4W , so it should be rated at least 0.5W , better 1W  (common is 0.25W or less with SMDs Smiley Wink )

If you (or someone with EE knowledge in your company) only has .25W resistors on stock, you can use four 1.2k resistors (two pairs parallel and these serial) ..

 

Greetings from Germany
Henrik

LV since v3.1

“ground” is a convenient fantasy

'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'


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Re: NI 9203

Thanks Henrik,

 

Will give a go with that.

 

Cheers,

Much appreciate

 

Zilvinas

 

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