None of the large chassis-based I/O platforms (1756, 1747, 1771) from Allen-Bradley have an Adapter mode on DeviceNet.
Two of the small distributed I/O platforms do; 1769 Compact I/O, and 1734 POINT I/O.
The 1756-DNB can be a slave device, but it needs a controller to exchange data with; it cannot directly bridge CIP connections to other 1756 I/O modules.