The IEC 61850 standard defines SCL file types in the engineering sequence. These files have a different definition, which is explained in IEC 61850-6. Three of the file types are used in the IED's engineering process.
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ICD = IED capability description
Capability description of the IED in logical nodes and their data. No information about, for example, the communication configuration is included.
An IED is already extended by default data sets and report control blocks. They are predefined by ABB. Changes or additional data sets, for example, are handled with IEC 61850 Configuration tool or IET600.
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SCD = Station configuration description
A complete configuration description of all IEDs in a station and the full engineering of the process signals and communication structure is included. This includes all the needed data sets and control blocks.
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CID = Configured IED description
The CID file contains the information needed for configuring one specific IED. The CID file contains the complete configuration description of the IED: the configured IED name, communication part, data sets and all control blocks.
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IID = Instantiated IED description
The IID file contains a complete IED configuration, like the CID file. The IID file can include references to other devices which are not present in the file. The IID file is meant for transferring configuration data from the IED configuration tool to a system configuration tool.