Hi, I am not sure what could be causing this but, while the processor is online and faulted, go to the upper left tab where you can change to program/download/online/etc. It should be marked red, click on go to fault code, it might hint you.
I had once a 0187h error code, somehow, that file I was trayinf to put in the PLC had a error that caused this fault, I did a new one with the exact things and it worked.