Hello,
I have been programming on SM35-J-R20 that my company found after another company they bought. However, for one application including 4-20mA sensor, 10-bit analog input was not enough sensitive, so we bought SM35-J-RA22.
After four weeks of waiting for it, it finally arrived. I was so excited for trying it out that I accidentaly connected it wrong - I connected 4-20 mA output to pin 1 (+24V) and +24V to pin 9 (AN2). This seems to have destroyed my AN2, because now when it is not connected, it fluctuates between 0-2, and when I connect it to something, it immideately shows value 32767.
Without a doubt, this is my mistake, however, Unitronics spoiled me in this, because after countless occurences of mistakely swapping 0V and +24V, after fixing the wiring it always worked well without any problem, so that's why I got neglectful towards my wiring. With that said, it would be nice if Unitronics made a precaution to this similarly to the precaution with swapping 0V and +24V.
Thaknfully, this project involves only one analog input, so using AN3 instead fixes my problem. However, what can I do if I wanted to fix AN2? When I looked at circuits, none of them looked burned.
Thank you in advance,
best regads
Š.K.