1746-A10, Ser B, SLC500 10-Slot Rack. 1746-IB16, Ser C, SLC500 Input Module x 4 Pieces (1 Piece Missing Cover). 1746-OA16, Ser D, SLC500 Output Module x 2 Pieces. 1746-OW16, Ser C, SLC500 Output Module.
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