I am having a problem with a TOF in one of my programs that has been working fine for years. Ther PR value of the timer has suddenly changed from 012 to FDC. Reloading the program corrects the issue for a day or two, but then it reverts to FDC. I cannot find any info on this and will not pay Rockwell $600 to answer my question. Only one TOF is affected. Thanks for any input.