Siemens 6GK1561-2AA00 is the SIMATIC NET CP 5612 communications processor for a PG or PC with a PCI bus. It connects the computer to PROFIBUS or MPI through an RS-485 interface. The PCI interface supports a 32-bit data path and 33 or 66 MHz bus operation. PROFIBUS transmission rates extend from 9.6 kbit/s to 12 Mbit/s. Separate input and output address areas support the configured DP master or DP device role.