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EOL: 1 Oct 2025PLC migration

S7-300 / ET 200M PM410: migration paths to S7-1500

Siemens discontinued S7-300 and ET 200M production on 1 October 2025 (PM410). Discover the three migration paths and which approach fits your installation.

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The facts
1 okt. 2025
Manufacturing stopped (PM410)
~2033
Spare parts available
S7-1500
Recommended successor
TIA Portal
Siemens migration tool
Migration paths

Three migration paths for S7-300 / ET 200M

The right choice depends on your existing installation, internal knowledge and strategic platform choice. We help you substantiate the decision.

01

S7-300 → S7-1500 (TIA Portal)

Recommended

The primary migration path. Siemens provides migration tools in TIA Portal that automatically convert a large portion of STEP 7 code. Hardware mapping: S7-300 racks → S7-1500 racks, ET 200M modules → ET 200SP.

02

S7-300 → B&R Automation Studio

Vendor-independent option when the plant already has B&R systems or seeks brand independence. Different code paradigm: IEC 61131-3 in Automation Studio vs. STEP 7. HMI: mapp View vs. WinCC.

03

S7-300 → Beckhoff TwinCAT / Rockwell ControlLogix

Situation-specific alternative. Beckhoff for CNC-oriented or PC-based control architecture. Rockwell ControlLogix when the customer already has a Rockwell ecosystem in the plant.

Decision criteria

What determines the right migration path?

Existing platform ecosystem
Which PLC/HMI brand does the plant already have? Mixing brands increases maintenance burden.
Code complexity and custom function blocks
Complex custom FBs using STEP 7-specific system functions do not auto-port. Inventory before project start.
Safety functions (F-CPU)
S7-300 F-CPU requires separate safety code that does not convert automatically to S7-1500 F-system. Allow extra FAT time.
Communication protocols
Profibus → Profinet switch requires new cabling. Often more expensive than the PLC replacement itself, include in cost estimate.
Approach

How we execute an S7-300 migration project

Step 1

Wiring audit + I/O mapping

Inventory of existing wiring, I/O cards, Profibus participants and custom function blocks. Determination of migration path and cost estimate.

Step 2

Code port + functional review

Migration from STEP 7 to TIA Portal (or target platform), including manual adaptation of custom code, safety functions and communication blocks.

Step 3

FAT on simulator + SAT with cutover

Factory Acceptance Test on simulated I/O outside production time. Site Acceptance Test on site with a schedulable production stop for cutover.

Frequently asked questions about S7-300 migration

Planning an S7-300 migration project?

We start with a wiring audit and code inventory and provide you with a reliable time and cost estimate.

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