S7-300 retrofits, process automation and commissioning for northwestern Switzerland and the tri-border area
Prybisch Automation is an engineering office in Luxembourg for Siemens automation (TIA Portal, WinCC Unified, retrofits). In Basel and northwestern Switzerland we provide PLC programming and retrofits for treatment plants, water and wastewater, and machine and plant building. Basel is about 3 h 45 min from Stadtbredimus.
S7-300 to S7-1200 G2 retrofit at a waste-to-energy plant
Waste-to-energy plant, Luxembourg · commissioned directly by the operator
Starting point
The central dust extraction system ran on an S7-300, operated via push buttons on the terminal cabinet. It had to be renewed without touching the hard-wired safety chain.
Scope
Retrofit to S7-1200 G2 in TIA Portal V21 with a Unified Basic panel, alarm system and manual operation agreed with the operating staff. Circuit diagrams updated in EPLAN, safety acceptance prepared as a structured record.
Result
Closed in July 2026 at the agreed fixed price, with seven days on site and operator training at handover.
Drive documentation for a wastewater treatment plant
Wastewater treatment plant, Luxembourg · on behalf of a general contractor
Starting point
The plant documentation lacked readable parameter lists for the frequency converters. The settings existed only in project files of the manufacturer's tool.
Scope
Parameter sets of five drives (pumps, blowers) read out in full and merged into complete lists with units and highlighted deviations.
Result
Five parameter lists produced (September 2026).
Automation engineering in Basel
Process plants often run for twenty years or more. Typical findings are S7-300 or S7-400 controllers whose project state is no longer fully documented, and a narrow window for any intervention. We prepare retrofits remotely: survey, program structure, HMI and testing in simulation. Conversion and commissioning follow on site during the planned shutdown. Interfaces to the higher-level process control system are agreed with whoever is responsible for it.
In water and wastewater, the expansion of treatment plants to remove micropollutants is a concrete trigger: new treatment stages need control engineering that fits into the existing plant, at municipal and industrial treatment plants alike. Renewing the controls of the existing stages at the same time saves a second intervention.
Your electrical partner handles installation and wiring; we deliver software, HMI and commissioning. Every project ends with a functional specification, test reports and a commented TIA project.
Industries with project experience
Water and wastewater, incl. industrial treatment plants
Do you work in regulated environments with strict documentation requirements?
Complete documentation is part of every project: functional specification, test reports and a commented TIA project. Requirements for structure and evidence we implement according to your templates. We do not have a pharma or GMP reference of our own, so we do not take on GMP validation projects.
Do you provide control engineering for treatment plants and water treatment?
Yes. For a treatment plant in Luxembourg we produced the drive documentation: complete parameter lists for five frequency converters driving pumps and blowers. The control engineering that matters here, such as S7-300 retrofits, fieldbus drives and WinCC Unified HMIs, is work we deliver in waste-to-energy and recycling projects.
Can an S5 or S7-300 system at a treatment plant be kept running?
For a while, yes; in the long run, no. S5 no longer has regular supply, and the S7-300 has been discontinued since October 2025, with spare parts expected until around 2033. Because a treatment plant cannot stop at will, it pays to plan before a failure: survey, migration concept and a conversion in stages, one treatment stage at a time.
How do you migrate an S7-300 to S7-1500?
First a survey of hardware, program and operator panels. Then a migration concept with effort and shutdown requirements. Program and HMI are built remotely and tested in simulation. During the shutdown your electrical partner carries out the conversion, and we handle signal testing and commissioning. The result: functional specification, test reports and a commented project.
How quickly can you be in Basel?
Driving time from Stadtbredimus is about 3 h 45 min. Plannable assignments are scheduled with some lead time, because on-site work requires a short advance registration. In case of a fault we start via your remote access, if available, and arrange an on-site visit as quickly as possible.
What does our purchasing department need to know?
Nothing extra: we take care of the formalities and invoice in CHF, or in EUR on request. We work under a contract for work. After the survey you receive a fixed-price quote for the engineering; commissioning and fault analysis are usually billed on a time-and-materials basis.
Who handles the control cabinet and wiring?
Your electrical partner or panel builder. We deliver software, HMI and commissioning, coordinate the interfaces and update the circuit diagrams in EPLAN on request.
Do you also cover the tri-border area: Basel, Lörrach, Saint-Louis?
Yes. Sites in Lörrach, Weil am Rhein or Saint-Louis are handled on the same model: prepared remotely, on site in planned blocks.
