Compact PLC CPU with Built-In I/O
The 6ES7211-0BA21-0XB0 is a SIMATIC S7-200 CPU 221 compact unit with AC power supply, fixed 6 DC inputs and 4 relay outputs, and 4 KB code / 2 KB data memory. The on-board I/O provides 6 digital inputs and 4 relay outputs for direct connection to sensors and actuators. This CPU is designed for standalone or small-network applications where the I/O count fits within the on-board terminals — it is not expandable with additional I/O modules in the S7-200 system.