The Allen-Bradley 1746-A13 is an SLC500 chassis. It has Thirteen (13) slots, providing backplane connections and housing to SLC500 Programmable Logic Controller (PLC) modules. This chassis has Eight (8) mounting tabs and installed directly to an enclosure subpanel. This chassis has physical dimensions of 50.2 x 17.1 x 14.5 cm (20.1 x 6.8 x 5.8 in) and weighs 1.9 kg (4.2 lbs).