The transition to Industry 4.0 is driving the adoption of advanced automation and control systems, integrating microservices and Edge Computing to enhance flexibility, scalability, and efficiency. However, the lack of standardized tools for developing industrial automation applications at the edge poses challenges. This study explores the use of Node-RED as an orchestration tool for Industrial Automation Systems, leveraging a custom block library that emulates IEC function blocks to facilitate microservice-based application development. A practical implementation was conducted in a process control pilot plant, where microservices for data acquisition and control were deployed and orchestrated using Node-RED. The results demonstrated the feasibility of this approach, ensuring real-time control and interoperability in industrial applications while overcoming challenges related to microservice coordination and standardization. Future work will focus on extending the methodology by incorporating IEC 61499 standards and improving microservice monitoring strategies.