Its an analog card – the configuration is probably store din the analog card and not in your code – the settings and adjustments .
You said ” I realized that the 1746-NI8 Analog card has no values in program.” you say it was working fine and had values before you started with the new card or after the new card or at both times.
You did not mention if you moved the analog card or not. Remember that card is configured differently than how it would be on a SLC or Control Logix .. it might be in the analog card configuration – so you might want to check that first – is the analog card on the end of the line or somewhere else ?
Also the power on the bus – power supply under rated ??