SIMATIC S7-300 and ET 200M discontinued: what to do now
Siemens announced the phase-out of SIMATIC S7-300 and ET 200M on 1 October 2023 and discontinued the types on 1 October 2025. Many plants keep running on them. This article summarises the dates and describes how to secure spare parts until the end of the plant life.
The dates according to Siemens
- 1 October 2023: announcement of the phase-out (product notice PM400) for SIMATIC S7-300 and the distributed I/O ET 200M.
- 1 October 2025: type discontinuation (PM410). Since then the part numbers can no longer be ordered through regular sales.
- Spare part phase: Siemens plans spare part supply until October 2033 according to its own information. Spare parts are offered through the Siemens spare parts service, not through regular catalog sales; availability and price differ per module.
The dates apply to the product families; individual accessories may differ. Check the lifecycle status of every part number in the Siemens Industry Mall or SiePortal before deciding on a replacement strategy.
What this means for running plants
A discontinuation does not stop a plant. It changes three things: new parts come only from remaining stock, repairs and spare parts run through the Siemens service with its own deadlines, and the successor (SIMATIC S7-1500 with ET 200SP or ET 200MP) is not a plug-in alternative but a migration project in TIA Portal. If you know the remaining life of the plant, calculate the demand until then and decide whether a spare parts reserve or a migration is cheaper.
The four routes, in this order
- Remaining stock of the original. Distributors and warehouses in several countries often still hold S7-300 CPUs (CPU 312 to 319), signal modules (SM 321, 322, 331, 332), communication processors and ET 200M interface modules (IM 153) for months to years. The condition matters: new in original packaging, stock with test report, or used. Our quotation names source and condition.
- Spare part from Siemens. Within the spare part phase Siemens offers modules through its spare parts service on that service's terms. For critical items it pays to compare both routes.
- Successor S7-1500 and ET 200SP. Siemens names the S7-1500 as the successor system and the ET 200MP as the successor of the ET 200M; the ET 200SP is a further option for distributed I/O. Conversion, program migration and acceptance are a project for your integrator; we supply the hardware from the bill of materials.
- Repair. For modules without remaining stock, repairing the existing unit can carry the plant until the planned migration.
How to secure your demand
- Create a parts list per plant: part number with version, quantity in use, criticality (does the plant stop on failure?).
- Source a reserve for critical numbers while remaining stock is available. We check every number usually within two business days and state source, condition, price and lead time.
- Set an obsolescence alert for all numbers on the list so that further discontinuations (accessories, memory cards, connectors) do not go unnoticed.
- Schedule the migration with your integrator before the spare part phase ends.
Discontinued Siemens numbers in the catalog
Our catalog flags discontinued Siemens part numbers and lists them under discontinued Siemens part numbers; the 6ES7 family covers S7-300, S7-1200, S7-1500 and ET 200. For checking successors and alternatives see our guide Discontinued Siemens modules: how to check successors.
As of September 2026. Dates according to Siemens product notices; the lifecycle status per part number in SiePortal is binding. Product names and trademarks belong to their respective manufacturers. For Siemens, ZWOD is an independent trader, not an authorised partner; technical approval of a successor is the operator's decision.