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You should have a 1747-SN Scanner module in the chassis that has the SLC-500 CPU in Slot 0.
>1749-IF8IH
That isn't a correct part number, which creates some confusion.
Follow that blue cable from the 1747-SN to the other network adapters. Are they in a chassis like the one that houses the CPU and the Scanner ?
Or are they smaller modules snapped together on a DIN rail, with a 1794-ASB "FLEX I/O" adapter ?
If the module is a1794-IF8IH, then that's a pretty sophisticated module. It has a HART modem integrated into it, making the configuration and operation a lot more complicated than ordinary analog modules.
And a quick check of the Installation Instructions confirms my recollection: I don't think this module can be used with a 1794-ASB (classic A-B Universal Remote I/O), but only with a ControlNet or EtherNet/IP adapter.
So let's go back and examine that SLC-5/0x (which model number exactly ?) and the Scanner module to see if it's a 1747-SN with the twisted-pair blue RIO cable, of a 1747-SCNR with ControlNet co-ax connectors.