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Alessandro Coppelli

Hi to all.

My question: I would like to use the product in object, and in the datasheet ( about on input ) it is written that we have to use a current between the range 2-12 mA. So the correct resistance ( that is  the value) is external ( depended on Vexternal)  and we have to add. Correct?  In the scheme ( https://www.industrialshields.com/shop/product/is-io220vac-5t24vdc-optoisolated-digital-input-module-converter-12vdc-vdc-to-220vac-to-5-24vdc-555?category=5#attr=) I don't see any mention on this.

 

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Bernat Brunet Pedra
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Dear Alessandro,


There is no need to add / connect any resistor in the circuit at all. The output pins will source the same voltage as they are powered with.

If you really want to use a resistor, it depends on the voltage you are powering the pins with (5-24Vdc). The output current is 20mA.

Have you checked this post? You may find more information about your doubt here:

https://www.industrialshields.com/blog/arduino-industrial-1/how-to-use-the-optoisolated-input-module-of-industrial-shields-65?blog=blog.blog%281%2C%29&blog_post=blog.post%2865%2C%29

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