How do you integrate SCADA with Manufacturing Execution Systems (MES)?

SCADA-MES integration per ISA-95: define information exchange (production schedules, work orders, material consumption, quality data, equipment status), establish interface boundaries (Level 2 SCADA to Level 3 MES), design data model mapping (equipment, products, processes), implement communication (OPC-UA, web services, database replication). Transactions: MES downloads production orders to SCADA, SCADA reports completions and consumption. Consider: data timing (real-time vs batch), transaction integrity, error handling, and security. Test integration thoroughly including failure scenarios. Benefits: real-time visibility, inventory accuracy, and reduced manual data entry.