The Desigo system is divided into three network levels:
- Management Level Network (MLN)
- Automation Level Network (ALN)
- Field Level Network (FLN)
This classification is based on the functions performed at a given level, rather than on the communications protocol or medium. The MLN and ALN use the BACnet protocol. The transport protocol (Data Link Layer) is LonTalk or IP. The FLN uses LonWorks, KNX and MS/TP technology.