Siemens | 6ES7647-7AD10-1AX0 | Simatic Microbox PC427B | SIMATIC MICROBOX PC 427B PROCESSOR: CELERON M 900 MHZ, 400 MHZ FSB, 0KB SLC, CAN MEMORY EXTENSION: 256 MBYTE, DDR2 533, SODIMM (1 X 256 MB) EXTENSION (HW): SECOND RS232 INTERFACE IN EXTENSION FRAME