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The Siemens 6ES7212-1AB21-0XB0 is a SIMATIC S7-200 CPU 222 compact unit with 8 DC digital inputs and 6 DC digital outputs. It runs on a DC power supply and provides 4 KB of program code memory with 2 KB of data memory for small to medium automation tasks. An integrated PROFIBUS DP interface allows the controller to be extended into a networked automation cell.