Siemens 6ES7212-1BB21-0XB0 Digital Input Module

Siemens 6ES7212-1BB21-0XB0 is the SIMATIC S7-200 CPU 222 Compact Unit with an integrated AC/DC/RLY power supply. It provides 8 digital inputs at 24 V DC and 6 digital relay outputs at 24 V DC, with each output rated up to 2 A. It contains 4 KB of program memory and 2 KB of data memory for simple control logic and data handling. An RS-485 interface (PPI/MPI/Freeport) enables serial communication, and the unit can be expanded with up to two expansion modules to grow I/O as needed. The internal power supply supports 85-264 V AC at 47-63 Hz, allowing direct mains connection in many installations. This CPU is designed for compact automation tasks such as machine-level control, packaging lines, and small process control, delivering a self-contained controller with the S7-200 development workflow. The 6ES7212-1BB21-0XB0 is commonly used where a lightweight, integrated PLC is preferred and is part of Siemens' SIMATIC S7-200 ecosystem.