We are using the 2009 LabVIEW Encoder Example program to test our encoders.
We are having a strange problem with getting an encoder to work.
We have two Bourns encoders labeled:
“ENA1J-B28”
“L00100L”
“0828M MEX”
There are 5 pins on the back of the encoder.
The first three pins are wired with a PWM plug attached and are providing the power and the signal for the first DI channel.
One pin is skipped and the 5th pin is providing the signal for the second DI channel. There are no wires attached to the PWR and the (-) pins on the second DI channel.
I connected an encoder to the Digital Inputs 1 & 2 as defined in the example program.
I ran the program from my laptop and it downloaded to the cRIO and when I turned the shaft on the encoder the display showed it going forward and reverse properly.
I went on to many other things for the next week or more.
We wanted to demonstrate some hardware interactions with the students.
The encoder did not work. I was afraid that I had damaged the encoder somehow.
We wired up the second encoder. It did not work using DI 1 & 2.
Just out of curiosity I changed the program and the encoder to DI 3 & 4. It worked.
I tried the first encoder on DI 3 & 4. It did not work. And, the second encoder would not work either. Even though it had at first.
I tried the “working” encoder on DI 5 & 6 and it did not work.
Does anyone have any suggestions?
Thanks
