Siemens 6ES7 902-1AC00-0AA0 – SIMATIC S7-300 Bus Connection Unit

The Siemens 6ES7 902-1AC00-0AA0 is a bus connection unit / bus adapter designed for the SIMATIC S7-300 modular controller rack. It provides the backplane connection between CPU and I/O modules, enabling data and power distribution across the module rack. Compatible with the SIMATIC S7-300 series and suitable for use in industrial automation systems for replacement or expansion of modular PLC setups.