Off The Shelf Solution for Open Collector Output to DC Voltage Conversion?

Thread Starter


Joined Apr 4, 2014
Hi everyone.

I have a device which provides open collector GPI outputs, and I'd like to interface the GPI outputs with 5 VDC or 12 VDC inputs on a PLC. While I can certainly build my own circuitry to convert each open collector output to a 5 or 12 VDC voltage that can interface with the PLC input, in the interest of saving time and keeping the wiring tidy and organized, I'm curious if anyone could recommend any off the shelf board or device that is designed to perform this type of logic conversion. I need to perform this conversion for about 20 open collector GPI outputs, so ideally some type of board or device with multiple I/O would be ideal.

Thanks for any suggestions!


Joined Mar 14, 2008
Assuming the open-collector output can tolerate 12V, you just connect a resistor (say 10kΩ or so) between the output and either the 5V or 12V rail voltage.