Glossary Tag: process monitoring

Core concept

Machine learning (ML) is a field of computing in which algorithms learn patterns from data and use those patterns to make predictions, classifications, or decisions without being explicitly programmed with fixed rules for every case.

In industrial and manufacturing contexts, ML is commonly applied to large volumes of process, equipment, quality, and supply chain data originating from OT and IT systems.

How machine learning is used in manufacturing

Machine learning in regulated and industrial environments commonly includes:

– **Predictive maintenance**: Using equipment sensor data, maintenance logs, and operating conditions to estimate remaining useful life or detect early signs of failure.
– **Process modeling and optimization**: Learning relationships between process parameters (temperatures, speeds, setpoints) and outputs (yield, cycle time, energy use) to support parameter tuning and process understanding.
– **Quality prediction and anomaly detection**: Predicting nonconformances or out-of-spec product using historical production and lab data, and flagging unusual behavior in real time.
– **Demand and inventory forecasting**: Learning patterns in orders, production schedules, and supply variability to improve planning.
– **Computer vision on the shop floor**: Using image data for automated inspection, label and code recognition, or counting and positioning of parts.
– **Operations intelligence**: Combining MES, historian, and ERP data to classify events, cluster similar production runs, or detect atypical operating modes.

These uses typically rely on data from MES, historians, PLCs, SCADA, LIMS, QMS, and ERP systems, often integrated via data platforms or operations intelligence layers.

Main categories of machine learning

In industrial systems, the following categories are most common:

– **Supervised learning**: Models are trained on labeled data (for example, pass/fail, defect type, or numeric lab results). Typical tasks include:
– Classification (e.g., predicting whether a batch will meet specifications)
– Regression (e.g., predicting a critical quality attribute)
– **Unsupervised learning**: Models learn structure from unlabeled data. Typical tasks include:
– Clustering (e.g., grouping similar operating modes or product variants based on sensor profiles)
– Dimensionality reduction (e.g., simplifying many correlated tags into a few latent factors)
– **Semi-supervised learning**: Uses a mix of labeled and unlabeled data, often useful where labeling quality events or defects is resource-intensive.
– **Reinforcement learning** (less common in regulated production): An agent learns decision policies through trial-and-error interaction with an environment, sometimes used in simulation-based optimization or scheduling research.

Boundaries and exclusions

Machine learning, in the way the term is commonly used on this site:

– **Includes**:
– Statistical and algorithmic approaches that automatically tune parameters based on data
– Both traditional algorithms (e.g., random forests, support vector machines, k-means clustering) and modern approaches (e.g., deep learning)
– Offline model building as well as online/real-time scoring embedded in MES, historians, or edge devices
– **Excludes**:
– Simple, fixed-rule logic (for example, PLC ladder logic, static SPC control limits) that does not adapt based on training data
– Generic data analytics or BI dashboards that visualize data without a learned predictive or pattern-recognition model

In practice, many industrial solutions combine ML with rule-based logic, engineering models, and domain heuristics.

Relationship to related concepts

– **Artificial intelligence (AI)**: ML is generally considered a subset of AI focused on learning from data. Not all AI systems use ML (for example, purely rule-based expert systems).
– **Data science and analytics**: ML is one activity within broader data science workflows, which also include data engineering, visualization, and domain analysis.
– **Statistical modeling**: Many ML methods are statistical at their core, but ML typically emphasizes predictive accuracy and scalability, while classical statistics often emphasizes inference and interpretability.
– **Process modeling and control**: ML-based models may complement physics-based models or traditional control strategies, but they are not a replacement for process understanding or formal control design.

Common confusion and misuse

– **”Any use of data” versus machine learning**: Reporting, KPIs, and dashboards that do not involve model training on historical data are often called “AI” or “ML” in marketing language, but they are more accurately described as analytics or BI.
– **Black-box assumptions**: Many ML models can be made more interpretable (for example, via feature importance or surrogate models). Treating all ML as inherently uninterpretable can be misleading, especially in regulated environments where traceability and explanation are required.
– **ML versus automation**: ML may inform automated actions (for example, setpoint suggestions), but automation can also be implemented with fixed logic, independent of ML.

Site context: OT, MES, and regulated environments

Within this site’s scope, machine learning is typically discussed in connection with:

– **OT data**: Time-series data from sensors, PLCs, DCS, and historians used for predicting equipment or process behavior.
– **MES and ERP integration**: Combining production orders, material genealogy, and event logs with sensor and lab data to build models across the full value chain.
– **Quality and compliance systems**: Using ML to support root-cause analysis, risk-based sampling strategies, or early detection of potential deviations, while maintaining audit trails and appropriate model lifecycle documentation.

Usage in regulated industries often requires additional controls around data integrity, model validation, change management, and traceability, even though those controls are not intrinsic properties of machine learning itself.