Terminal Base, Flex I/O, 32 Point, Cage Clamp, 24 - 16 AWG, 31.2 Volt AC/DCEach FLEX I/O™ module requires a terminal base unit that snaps onto the DIN rail to the right of the I/O adapter. The terminal bases provide terminal connection points for I/O wiring and plug together to form the backplane. They are available with cage, screw or spring - clamp terminations.