Even though Industry 4.0 has been advancing significantly in the last years, the upgrade of Legacy systems is still a reality that needs to be attended to due to their large presence in developing countries. To achieve this goal, this paper proposes a continuation of previous research to increase knowledge and improve efficacy of a Node-RED / OPC-UA based IIoT automation solution for a Festo FMS Legacy System with S7-300 PLC´s. This paper will focus on scaling and adding new stations, as well as improving the existing structure for future upgrades. At the end, the results showed a possible scenario to keep using Node-RED and OPC-UA with some reservations as well as future possible work.