Table of Contents
Manufacturing Execution System (MES) are manufacturing enterprise solutions that track, document and process control the manufacturing process of goods from raw materials to the final product. In the process of production operations, MES establishes a link between a company’s planning and control systems (such as an ERP system) and actual production operations. It ensures that quality and efficiency are included and systematically implemented in the manufacturing process.
The Manufacturing Execution System targets maximum performance and increases production efficiency and productivity. Its main purpose is to provide managers with accurate and reliable production data to make the plant floor more efficient and optimise production. MES makes the manufacturing process data-driven for production operations of all sizes, contributing to overall productivity.
MES provides real-time visibility and process control of production processes. Businesses can monitor production line operations, minimise downtime, identify bottlenecks, and make more informed decisions. MES systems increase profitability by offering workload balancing, efficient resource allocation and on-time delivery. At the same time, MES helps businesses determine OEE (Overall Equipment Effectiveness), a key measurement for production efficiency monitoring.
MES is an information system connected to the factory floor to monitor and control complex production systems and data flows. It monitors and collects accurate, real-time data about the entire product life cycle, from final product order to delivery. MES links, monitors and controls complex production systems in the factory and integrates multiple factories and suppliers with real-time production information.
One of the most significant advancements in modern MES deployments is the integration of the OPC-UA (Open Platform Communications – Unified Architecture) protocol. OPC-UA is a machine-to-software communication protocol that enables secure, real-time and standardised communication between industrial machines and higher-level systems such as MES and ERP.
Unlike older industrial communication methods, OPC-UA is platform-independent, includes built-in security layers, supports encrypted communication and bridges the IT and OT (Operational Technology) worlds. This makes it the de facto standard for connecting CNC machines, PLCs, sensors and robots to MES systems — without proprietary middleware.
How OPC-UA enhances MES:
For a detailed look at how OPC-UA integrates CNC machines with SAP, see our article: How Can You Integrate Your CNC Machines with SAP EWM?
MES in the Automotive Industry: Helps plan complex assembly lines, tracks vehicle progress and harmonises processes between different workstations. Manages recalls, complies with industry standards and ensures quality control.
MES in the Pharmaceutical Industry: Ensures product integrity and regulatory compliance. Emphasises recipe management, batch management, real-time quality control and electronic batch records.
MES in Aerospace and Defence: Manages work orders for aircraft or defence system assembly, tracks parts movement, documents test and inspection processes, and ensures strict regulatory compliance.
MES in the Food and Beverage Industry: Ensures compliance with food safety regulations. Manages recipes, tracks ingredients and implements quality control procedures.
Automation: MES software automates tasks, eliminating manual processes and greatly reducing error rates. It helps the plant floor increase efficiency by streamlining workflows.
Real-Time Tracking: MES systems monitor the entire movement of processes and materials throughout the smart manufacturing lifecycle — a critical need for industries subject to strict legal regulations.
Improved Quality Control: Quality control data is sent in real time. Companies using MES can stop production immediately when a problem is detected, reducing redundancies, rework and waste.
Reduced Inventory: MES keeps inventory records up to date with information on mismatched material, scrap and new production, enabling transport, purchasing and planning departments to always know which material is on hand.
Paperless Shop Floor: MES reduces human error by eliminating paper-related work. Data recorded in the system becomes instantly available for all employees in integrated systems.
ERP is used to create and manage basic factory plans — production, material use, delivery and shipping — over a period of weeks, months or days. ERP modules typically cover production, supply chain, order processing, inventory management, human resources and customer relationship management.
MES is used to manage and report facility activities and run production operations in real time as events occur. It records and highlights anomalies. Typical functions include electronic batch recording, weighing and distribution, equipment management, setup and cleaning. MES works within a time frame of days, shifts, hours and minutes.
In short: an ERP system is for manufacturing and logistics planning, while an MES is for manufacturing operations management in real time. For a broader understanding of SAP’s role in production, see our What is SAP MII? article.
Integrating MES and ERP connects the potentials of both systems and helps businesses fully utilise the features of each. MES and ERP integration creates a centralised data system that provides a single view for many processes such as procurement, supply chain management, finance and production logistics. ERP systems provide data on what products need to be produced, while MES integrates ERP data with production line data — helping produce with less waste and more profitability.
For SAP users, SAP MII (Manufacturing Integration and Intelligence) serves as the bridge between MES-level shop floor data and SAP ERP, enabling end-to-end manufacturing visibility. SAP MII’s energy monitoring capabilities further extend MES value by tracking and reducing energy consumption in production.
Is SAP an MES?
SAP offers a comprehensive manufacturing execution system: SAP Manufacturing Execution (SAP ME). SAP ME is an MES solution that helps automate, digitally control and monitor manufacturing operations. Integrated with SAP ERP, SAP ME creates centralised processes and increases production reliability through automated data collection.
Is MES Cloud-Based?
The speed of digital transformation in cloud computing enables MES to be offered as a cloud-based solution. Cloud-based MES solutions offer advantages such as flexible configuration, reduced infrastructure costs and scalability. SAP’s cloud manufacturing solutions integrate seamlessly with S/4HANA.
What is OPC-UA and why does it matter for MES?
OPC-UA (Open Platform Communications – Unified Architecture) is the leading industry-standard protocol for machine-to-system communication. It enables MES to receive real-time data directly from CNC machines, PLCs and sensors — regardless of their brand or model. This eliminates manual data collection, reduces errors and enables predictive maintenance. For SAP-connected MES environments, OPC-UA data is typically processed through SAP MII or SAP Integration Suite before reaching ERP.
What is SAP MII? — MDP Group CNC Machine Integration with SAP EWM — MDP Group SAP MII Energy Monitoring — MDP Group MESA International — Manufacturing Enterprise Solutions Association OPC Foundation — OPC-UA Official Resource
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