The Siemens PLC model number 6ES7421-1BL01-0AA0 is a part of the SIMATIC S7-400 series. It is a programmable logic controller (PLC) used for automation and control applications in various industries.

Here's some information about the 6ES7421-1BL01-0AA0:

It belongs to the S7-400 series, which is a high-performance PLC family designed for complex and demanding automation tasks.

The 6ES7421-1BL01-0AA0 model is equipped with digital inputs and outputs (DI/DO) and is expandable with additional modules to support a wide range of I/O requirements.

It has 16 digital inputs and 16 digital outputs built-in.

The 6ES7421-1BL01-0AA0 PLC supports multiple programming languages, including ladder logic (LAD), function block diagram (FBD), and structured control language (SCL).

It offers advanced functionality such as PID control, data logging, communication interfaces (e.g., Profibus, Ethernet), and high-speed counters.

The PLC can be programmed and configured using Siemens' programming software, such as STEP 7 or TIA Portal, which provide a user-friendly environment for developing and maintaining PLC applications.

The 6ES7421-1BL01-0AA0 PLC is known for its robustness, reliability, and performance, making it suitable for demanding industrial automation applications.