Siemens 6ES7211-0BA23-0XB0 SIMATIC S7-200 CPU 221 Compact Unit

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Key Parameters

Core Features & Advantages

• Compact and Cost-Effective Design: The module's standout feature is its all-in-one design, providing a fixed 10-point I/O configuration (6 inputs, 4 outputs) with no support for expansion modules. This makes it an extremely compact and economical solution for simple control applications where the I/O count is known and limited.

• Basic Processing Power for Simple Applications: The CPU 221 is designed for straightforward control tasks. It provides 4 KB of program memory and 2 KB of data memory, which is adequate for controlling small machines or processes with simple logic.

• Essential High-Speed Functions: Despite its compact size, it includes fundamental high-speed functions. It has 4 independent 30 kHz high-speed counters and 2 independent 20 kHz high-speed pulse outputs, making it suitable for basic positioning or speed control tasks.

• Multiple Communication Protocols: The single built-in RS485 interface supports PPI, MPI, and Freeport communication protocols, allowing it to connect with HMIs, other S7-200 CPUs, and non-Siemens devices via serial communication.

Typical Applications

The CPU 221 is widely used as a micro-controller for small-scale automation applications, including:

• Simple Machine Control: Controlling small packaging machines, labeling machines, and conveyor sections.

• Building Automation: Managing simple building control tasks like lighting control or small fan systems.

• Sensor and Actuator Interfacing: Directly connecting a limited number of sensors and actuators for a specific control loop.

Important Product Status Note

This product is part of the SIMATIC S7-200 series, which is discontinued by Siemens and no longer in active production. It is considered a spare part, and availability is primarily through surplus or third-party suppliers. For new system designs, the recommended migration path is to the S7-200 SMART series

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