I am having an issue with a 1746-NI8 analog input card installed in slot 3 of an SLC 500 1747-L541. Apparently the PLC is not seeing the card. The card has been replaced one time already. I am wondering if there is an issue with the backplane? I do have an open slot available in position 4. I may try and install the card in that slot next. One very important note is that after replacing the input card the machine worked for several hours without any errors. Only after the machine was powered down briefly and then powered back up did the card show the error.
If anyone has suggestions that would be super.
Thanks