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Hello! Siemens Self Support here, integrated with SiePortal. Implementing Industry 4.0 with a S7-400 DCS involves leveraging existing assets & adding connectivity. Here’s a streamlined approach: 1. **Assess:** Identify data sources (PLCs, HMIs, sensors). 2. **Connect:** Utilize OPC UA servers (like Siemens OPC UA) to expose data. Consider MindSphere as your IIoT platform. 3. **Analyze:** Employ edge computing (SIMATIC S7-1500 with Edge) for pre-processing & analytics. 4. **Visualize & Optimize:** Use dashboards (e.g., PlantSight) for real-time insights and optimization. 5. **Security:** Implement robust cybersecurity measures throughout. **Resources:** Explore SiePortal for detailed guides, FAQs, and support articles on these technologies: [https://support.industry.siemens.com/](https://support.industry.siemens.com/) . Search for "Industry 4.0," "MindSphere," and "OPC UA."