The verdict in three sentences
An MES (Manufacturing Execution System) turns Excel sheets and paper logs into real-time shop-floor control: OEE, traceability, machine data capture. In 2026 the question is no longer whether to digitize, but whether to buy a vendor product or build a custom module on top of your ERP. Well scoped, an MES pays back in 12 to 24 months through lower scrap and higher productivity.
Vendor MES or custom module: the real trade-off
A general-purpose vendor (Aveva, Siemens Opcenter, plus French players) covers 80% of standard needs but imposes its data model and per-seat licences. A custom module fits your exact routings and existing ERP, with no recurring licence, at the cost of a more concentrated up-front investment. The deciding factor: number of lines, process variability and how specific your KPIs are.
| Criterion | Vendor MES | Custom module |
|---|---|---|
| Up-front investment (2026) | EUR 60,000-150,000 | EUR 40,000-90,000 |
| Recurring licences | EUR 8,000-25,000/yr | 0 (hosting only) |
| Deployment lead time | 20-32 weeks | 16-26 weeks |
| Fit to your routings | Constrained config | Fully bespoke |
| Machine data (OPC-UA/Modbus) | Native | To develop |
| Vendor lock-in | High | Low |
The modules that create value
Not all modules deliver equal ROI. Real-time OEE tracking and traceability are the two bricks that pay back fastest, because they directly attack scrap and unexplained downtime.
| MES module | What it delivers | Quantified impact (2026 order of magnitude) |
|---|---|---|
| Real-time OEE tracking | Downtime, rate, quality visibility | +5 to +12 OEE points |
| Product/batch traceability | Genealogy, targeted recalls | Recall scope cut 5-10x |
| Touchscreen shop-floor entry | No more paper, reliable data | -70% entry time |
| Automatic machine data | Counters, alarms, micro-stops | +30% micro-stop detection |
| Scheduling / work-order tracking | Prioritization, controlled WIP | WIP -10 to -20% |
| Integrated quality control | Traced non-conformities | Scrap -15 to -25% |
Mini case study
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Marc, industrial director of a 90-person plastics SME near Lyon, runs 6% scrap on EUR 4M of material, i.e. EUR 240,000/yr thrown away. He deploys a custom MES module for EUR 72,000 (22-week lead time). Bringing scrap from 6% to 4.3% saves roughly EUR 68,000/yr, plus 4 OEE points of value. Payback lands in 13 months, before counting traceability gains in a recall.
FAQ
How much does an MES cost in 2026? For one to three lines, the order of magnitude is EUR 40,000-90,000 custom, and EUR 60,000-150,000 vendor-side, plus recurring licences (EUR 8,000-25,000/yr).
Do I need an ERP before an MES? Not necessarily, but the MES delivers most value connected to the ERP for work orders and BOMs. A two-way connector runs EUR 5,000-15,000.
How soon do gains appear? Entry and OEE visibility gains show at go-live, often in 16-26 weeks. Scrap reduction consolidates over 2-4 months of operation.
How is machine data captured? Via OPC-UA, Modbus or PLC API. Budget EUR 800-2,500 per machine depending on age and the presence of communicating PLCs.
Custom or vendor for 2 lines? Below 3-4 lines with specific processes, custom is often more profitable over 3 years thanks to no licences and exact fit to routings.
Let's scope your project. Describe your shop floor (line count, ERP in place, priority KPIs) and we'll price a vendor or custom MES, indicative budget EUR 40,000-150,000. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
