The advent of Industry 4.0 has introduced significant advantages in information and communication technologies but also presents challenges, such as the need for standardization to ensure interoperability, especially in legacy systems. This paper explores information modeling using the Asset Administration Shell (AAS), applied to a Flexible Manufacturing System (FMS) from Festo. The aim is to demonstrate how AAS-based data modeling can structure communication between machines and systems on Legacy Systems. AAS submodels were created using the Eclipse AASX Package Explorer. In addition to modeling, a proof of concept was achieved by integrating AAS into an OPC UA server via Node-RED. The results show the potential of AAS but highlight challenges such as adapting legacy systems and implementing current technologies.