Some 1746 analog modules do not require software configuraton.
Look at the screen shot rojay attached. The rung comment indicates it is for configuring a 1746-NI8 module, so the original program was definitely a SLC500 program. The rung copies 8 words from N9:0 to O:5.0. Were you to attempt to do that on a Micrologix 1762-IF4 you would get an error because no output word is allocated in the IO image table for that module.
If you used the configuration tool, RSLogix would create a file and insert the rung for you. To see this open a new blank RSLogix500 project, pick a SLC5/03, 04, or 05 processor, insert an NI8 module, click advanced config, and then configure. Configure a few of the channels as desired, then click the OKs. Logix should insert a rung for you and add a configuration file. If you opened the configuration file and changed the radix to binary you can see that the bits are set just like you would set them if you followed the configuration tables from the IO modules manual. Eight input words and eight output words are allocated to the module in the IO image table.
However if you inserted a 1746-NI4 module you wouldn't get a configuration option because that card is set up using dip switches and doesn't support as many options. In the case of the NI4, 4 input words and no output words are allocated for the IO image table.