SIMATIC S5 Replacement Guide: When and How to Migrate

The SIMATIC S5 series has run reliably in the field for decades — but spare-part supply gets harder every year, and the risk of unplanned downtime grows with every failure. This guide summarizes the criteria that should drive your migration decision.

The first step of any migration is documenting the current state: without an active I/O list, the program structure and a field-equipment inventory, no reliable scope can be set. The second step is engineering the equivalent architecture on S7-1500 and the accompanying drive renewals.

The conversion itself, when planned correctly, fits into a single maintenance stop. The critical point is de-risking commissioning with simulation and testing beforehand.

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