A niche but powerful use case: using DDE (Dynamic Data Exchange) or VBA macros that call S7DOS DLLs. Maintenance teams can create a simple Excel dashboard that displays live "motor current" or "valve status" from an S7-300, bypassing expensive HMI licenses.
Siemens has officially transitioned to and LibOPC UAClient . The SIMATIC NET V18 (released 2023) still includes the S7DOS interface for backward compatibility, but no major new features are added. simatic s7dos
The SIMATIC S7DOS series competes with other leading PLC systems, such as: A niche but powerful use case: using DDE
: Used for hardware configuration and software engineering. simatic s7dos