6DD1660-0BJ0

Siemens 6DD1660-0BJ0 is the CP53M0 communications module for coupling SIMATIC TDC and SIMADYN D racks. The optical connection carries the configured rack-to-rack data exchange and supports expansion of an existing control arrangement. Its role is rack coupling, so it must be distinguished from an Industrial Ethernet or PROFIBUS communications module.

The coupling hardware has 128 KB SRAM communication memory and 8 MB SDRAM buffer memory. Its optical interface configuration provides two interfaces in master mode or one in slave mode, with 96 Mbit/s data transmission and 5B/6B coding. The master/slave role and connected peer must agree with the rack configuration; optical connection alone does not define the application data mapping.

Typical consumption is 0.3 A from the 5 V supply and 0.5 A from 3.3 V, with typical power loss of 3.1 W. Assess the rack power budget and preserve the original optical port allocation and configured data exchange during replacement. Before releasing the restored system, verify the relevant rack roles, application data and diagnostics together rather than checking only physical link continuity.