What Is a MES (Manufacturing Execution System)? A Guide for Manufacturers

What Is a MES?

A Manufacturing Execution System (MES) is the software layer that manages and monitors the transformation of raw materials into finished goods on the factory floor. It sits between your ERP (SAP, Oracle) at the top and your SCADA/PLC control systems at the bottom — receiving production orders from above and real-time machine data from below.

What Does a MES Do?

• Work order management — schedules and dispatches production orders to the shop floor
• Production tracking — monitors real-time progress of each batch or job
• Quality management — enforces inspection points, records QC results, flags non-conformance
• Materials tracking — tracks raw material consumption and WIP inventory
• Labour tracking — records operator time against production orders
• OEE calculation — measures availability, performance, and quality in real time
• Genealogy and traceability — records what went into every product for compliance and recall management

MES vs ERP vs SCADA

System	Focus	Time Horizon
ERP	Business planning, finance, supply chain	Days to months
MES	Shop floor execution and tracking	Hours to days
SCADA	Machine monitoring and control	Seconds to minutes

MES Hardware Requirements

MES workstations on the shop floor need rugged, industrial-grade hardware. Key requirements include fanless Panel PCs with IP65 front panels to survive wash-downs, wide-format touchscreens for operator input, and COM ports for barcode scanner and label printer connectivity. TSL Automation's Avalue Panel PCs are ideal for MES operator stations across Indian manufacturing plants.