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Industry 4.0 Guide: MES, SCADA, OEE and Predictive Maintenance

Industry 4.0

What Industry 4.0 means for smaller manufacturers and where to start: our OEE, MES, SCADA, predictive maintenance and traceability guides in one place.

Industry 4.0 is not about rebuilding the factory. It is about turning the data coming off machines, lines and operators into something you can make decisions with. Without that data, the losses are real: Siemens' The True Cost of Downtime 2024 estimates that the world's 500 largest companies lose almost $1.4 trillion a year to unplanned downtime, equivalent to 11% of their revenues. The upside has been measured too. Independent surveys cited in the US Department of Energy's Operations & Maintenance Best Practices Guide report that a functional predictive maintenance programme cuts downtime by 35–45%.

This hub arranges our Industry 4.0 articles into a reading path. Start with the Industry 4.0 roadmap for SMEs, then read how to calculate OEE to see line efficiency in a single number. If you want data without replacing equipment, our guide to retrofitting legacy machines describes the first practical step.

Going deeper, three systems do most of the work: MES, and how it differs from ERP, which manages work orders and line data; SCADA, which monitors machine and plant signals; and predictive maintenance, which catches failures before they stop production. On the quality and planning side, read about production traceability and moving from spreadsheets to APS scheduling. At the decision stage, our comparison of commercial and custom SCADA sets out licensing and ownership costs impartially.

For delivery, see our Industry 4.0 solutions, MES production management, SCADA and HMI and predictive maintenance pages. For predictive maintenance we start with a pilot on one to three critical machines and look at the metrics together over the first 30–60 days; the Industry 4.0 site assessment is free of charge. Before you begin, note which line suffers the most downtime and which figures are still written down by hand.

Reading list by topic

  • Quality: SPC, Cp and Cpk, 8D problem solving, product recall drills and andon systems.
  • Maintenance: vibration analysis for fault detection.
  • Energy and facilities: factory energy monitoring, reactive power penalties, building management systems and cold chain monitoring and HACCP.
Start here

What Is Industry 4.0? A Step-by-Step Factory Roadmap for Small and Mid-Sized Manufacturers

What Industry 4.0 means for a smaller factory and where to begin: a five-stage roadmap from machine data to quality and prediction, plus how to pick a pilot.

Read the guide

All guides in this topic (3)

Questions we hear most often

Frequently Asked Questions

Do we need new machines to start with Industry 4.0?

No. In most factories the first step is adding sensors, meters or PLC connections to existing machines to capture running time, stoppages and output counts. Older machines can be digitised with the right hardware. New equipment is best planned once the data shows which bottleneck actually matters, rather than as the starting point.

What is the difference between MES and SCADA?

SCADA works at machine and process level, monitoring and controlling values such as temperature, pressure and motor status in real time. MES works at work-order level, managing which order runs on which line, with which materials, in how long and with how much scrap. The two complement each other and usually integrate with the ERP.

Why does OEE matter?

OEE combines availability, performance and quality into one indicator. It shows whether a line's losses come from stoppages, slow running or defective output. Calculated properly, OEE lets you decide with evidence where improvement investment should go, and it gives you a consistent way to measure progress once changes are made on the line.

How do you set up a predictive maintenance pilot?

Pick one to three machines that are critical and fail most often. Fit vibration, temperature or current sensors and let the system learn normal operating behaviour. Thresholds and alerts are tuned over the first few weeks; the pilot's value is measured against avoided stoppages and maintenance records before the scope is widened.

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