6ES7134-4NB51-0AB0 is a Siemens SIMATIC S7-300 PLC module. It is a digital input/output module with 16 digital inputs and 16 digital outputs. The module is part of the S7-300 series, which is a widely used programmable logic controller (PLC) system.

The 6ES7134-4NB51-0AB0 module supports various input and output signals, including standard digital signals. It can be used for various automation applications in industrial environments.

This Siemens PLC module has a compact design, and it can be easily integrated into a larger PLC system. It supports a wide range of communication protocols and can be programmed using Siemens STEP 7 software or other compatible programming tools.