The first step in the IEC 61850 structure mapping is to map the real IEDs to the customer-specific IEDs. IED mapping means that each server IED in the FPN model is mapped with a corresponding IED in the internal PCM600 model, that is, the real device in the substation. A server IED is an IED that has an access point containing a server. IED mapping does not map the data attributes between the IEDs unless the data attribute mapping is complete. IED mapping can be done in the PCM600 plant structure and in IEC 61850 Structure Mapping.