Siemens 6ES7 155-6AU00-0BN0 Simatic S7-300 Module

Siemens 6ES7 155-6AU00-0BN0 is the IM 155-6 PN ST interface module for the ET 200SP distributed I/O system, functioning as the PROFINET IO bridge that connects a SIMATIC S7-300 controller to ET 200SP remote I/O nodes. As the PN ST variant, it provides the PROFINET interface needed to integrate ET 200SP with a PLC, enabling scalable, modular automation across multiple field modules. The part number maps to the IM 155-6 family and is listed in Siemens catalogs as 6ES7 155-6AU00-0BN0. Typical applications include distributed automation on factory floors where sensors and actuators are deployed across several ET 200SP modules, with the IM 155-6 PN ST handling the network communication between the ET 200SP I/O chain and the S7-300. It is part of the ET 200SP ecosystem and is referenced in compatibility charts for ET 200SP Ex modules, highlighting its role in PN ST configurations across the ET 200SP line. In engineering environments, this interface module is supported by STEP 7 tooling (V5.5 SP3 and newer) and aligns with Siemens' documented workflows for configuring and diagnosing classic S7-300 projects.