Siemens 6ES7211-0AA21-0XB0 Programmable Logic Controller Module

Siemens 6ES7211-0AA21-0XB0 is a CPU 221 compact module for the SIMATIC S7-200 family, built for compact discrete-control tasks in small machines and packaging lines. It operates on 24 V DC power and provides 6 digital inputs and 4 digital outputs to handle basic sensing and actuation. The module includes 4 KB of code memory and 2 KB of data memory, supporting simple automation programs and on-board data handling typical of the CPU 221 series. As a compact CPU, it mounts within the S7-200 hardware ecosystem and is designed for standalone control or as part of a small, integrated control system. This variant is documented as a 24 V DC-powered CPU, and lifecycle records indicate it was discontinued on October 1, 2014, reflecting its status within the SIMATIC S7-200 line.