To migrate from S7-300 or SIMATIC ET 200M, Siemens recommends using the TIA Selection Tool. This tool is available for free as a desktop or cloud version. It helps in planning and configuring your new system, including module selection, network, and power supplies. Therefore, this allows for precise migration to the modern S7-1500 controller platform and distributed I/O systems like ET 200SP HA or ET 200MP.

For detailed engineering, refer to the official Migration Guide: SIMATIC S7-300/400 to S7-1500. This outlines hardware conversion steps, CPU module mapping and programming adaptation advice.

When transitioning ET 200M I/O modules, Siemens provides I/O adapter solutions. They also offer retrofit guides to help mount legacy modules onto the new ET 200SP HA system with minimal rewiring.

For more information on the recommended upgrade path of the S7-300 and ET200M components, visit the Siemens portal.