Siemens S7-300 and ET 200M Phase-Out: The End of an Era for a Legendary PLC
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Siemens S7-300 & ET 200M Obsolescence Guide
Siemens ended S7-300 production in October 2025. Get the guide that shows you how to keep your lines running while you plan what's next.
- Key phase-out dates and what they mean
- Repair, refurbished, new surplus, or migrate
- Critical spares checklist
- 240 part numbers across 8 module families
100% free. No sales call.
For more than 30 years, the SIMATIC S7-300 has been one of the most trusted and widely used PLC systems in the world. Introduced by Siemens in 1994 as the successor to the SIMATIC S5, the S7-300 became an industry standard — known for its modular design, broad CPU lineup, and remarkable reliability across countless industrial applications.
Now, after decades of proven performance, Siemens has officially entered the phase-out period for the S7-300 and its corresponding ET 200M I/O system.
A Brief Look Back: A PLC That Defined a Generation
Over the years, it has been deployed in millions of systems worldwide, including:
-- Discrete manufacturing and machinery – assembly, packaging, and production lines.
-- Water and wastewater treatment – decentralized I/O at pumping stations and plants.
-- Energy and process industries – power generation, utilities, oil & gas.
Its adaptability, longevity, and stability earned the S7-300 a reputation for rock-solid performance — one that will keep it relevant in maintenance and service for many years, even as production ends.
Official Phase-Out Milestones
Siemens has now defined the official product lifecycle for the S7-300 / ET 200M family:
-- PM400 (Phase-Out Announcement) – October 1, 2023: Products remain available but are no longer actively marketed.
-- PM410 (Discontinuation) – October 1, 2025: New production stops. Parts will be available only as spares or for repair/exchange.
-- Spare Parts Availability – until at least October 1, 2033: Beyond that, Siemens recommends migrating to modern alternatives such as the S7-1500, S7-1200, or ET 200SP HA families.
Recommended Migration Paths
For Factory Automation
-- SIMATIC S7-1500 system
-- SIMATIC ET 200MP or ET 200SP I/O systems For Process Automation
-- SIMATIC ET 200SP HA I/O with high-availability configurations
Migration guides and conversion tools are available through Siemens to assist with configuration and code transfer from the S7-300 platform.
What This Means for Operators
Once the PM410 milestone is reached, Siemens will no longer offer the S7-300 / ET 200M as new products. Only limited spare-part quantities and repair services will be available — meaning that plant expansions and new installations will no longer be feasible using these models.
If your operations rely on the S7-300, now is the time to:
-- Secure critical spares while supply remains stable
-- Plan a migration strategy to supported PLC platforms
-- Evaluate repair and refurbishment options to extend existing hardware life
How Classic Automation Can Help
At Classic Automation, we specialize in helping customers bridge the gap between legacy and next-generation systems.
Our team continues to stock, test, and repair a wide range of Siemens hardware, including:
-- S7-300 CPUs and I/O modules
-- Communication, function, and technology modules
-- ET 200M interface units and accessories
-- All repairs are performed in-house on dedicated Siemens test systems and backed by a 2-year warranty — ensuring dependable operation during your transition period.
Whether you’re maintaining existing infrastructure or preparing for migration, Classic Automation provides the parts, repairs, and expertise to keep your facility running smoothly.
Next Steps
✔ Stock up on S7-300 and ET 200M modules while they’re still available.
✔ Plan ahead for migration to the S7-1500 / ET 200MP or ET 200SP HA systems.
✔ Contact our team for verified refurbished parts, in-house repair options, or help selecting compatible replacements.
Don’t let phase-outs affect your systems— Classic Automation keeps your production running.
