Article Number (Market Facing Number): 6ES72121AE400XB0 | 6ES72121AE400XB0 Product Description: SIMATIC S7-1200, CPU 1212C, COMPACT CPU, DC/DC/DC, ONBOARD I/O: 8 DI 24V DC; 6 DO 24 V DC; 2 AI 0 - 10V DC, POWER SUPPLY: DC 20.4 - 28.8 V DC, PROGRAM/DATA MEMORY: 75 KB NOTE: !!V13 SP1 PORTAL SOFTWARE IS REQUIRED TO PROGRAM!!