writing to one digital channel and reading from other

[Rex_saint]

I am working on 9074 cRio, and have a 9401 digital I/O module. I wrote a very simple program, in which i write a logic one to a digital output line and i physically wire this digital out put line to another digital input line and read it in program.

-I connected channels DI/O-1 (used as outputline) to DI/O-2(used as input line)  of same 9401 module with a same wire Its a very simple program but i don't understand where things are not working out. Please help me out.

[Rex_saint]

I learnt that the 8 channels are divided into two ports (0 to 3) and (4 to 7). and all port lines should be having same line direction. So i changed this time the input channel from D2 to D5.

Still when am reading the input port i am not getting a logic one

[crossrulz]

I have to ask the stupid questions:

Did you move your wire so that channels 1 and 5 are connected?

Are you sure you connected the right pins?

[Rex_saint]

🙂 Sir that was indeed a wise question to ask.

All connections and confugrations are correct. To my surprise i just discovered that the problem was with the power supply from which i am taking ground for 9401. I jst changed the power supply and its working fine. Thank you