Siemens 6ES7590-0BH00-0AA0 identifies the active backplane bus ST 1+8 slot in the SIMATIC S7-1500 / ET 200MP documentation. The 1+8 arrangement accommodates one interface module and eight I/O modules. This is a backplane component, not a CPU or a complete PLC assembly.

The slot arrangement is specific to this article number. Check the station layout and the manufacturer requirements for the interface module, I/O modules and engineering configuration before ordering. Do not treat a different slot-count version as a direct replacement without checking the application.

For a quotation, provide the complete article number, quantity and delivery country. If you are replacing an installed part, include a nameplate photo and station configuration. ChainXcel confirms the requested condition, package contents, documents, availability, price and dispatch timing in the quotation.