The protection relay application includes a number of general-purpose I/O data. By default, these data are mapped to this protocol. See the point list manual for the exact mappings.
The general-purpose objects can be connected to any internal object in the protection relay configuration application using the Application Configuration or Signal Matrix tool. This gives additional opportunities for the protocols.
Example 1
Due to security reasons, protocols do not contain mappings for the direct control of physical outputs. This way, the client cannot accidentally write a change to a physical output.
It is possible to connect general-purpose outputs to physical outputs using the Application Configuration tool. The general-purpose output can also be controlled from the protocol.
Example 2
The legacy protocol default mappings are a selection of the most important signals produced by the IEC 61850-based protection relay applications. The manufacturer’s selection of important signals may not always serve every customer.
Any non-protocol-mapped internal signal can be freely connected to a general-purpose input object via the Application Configuration tool. This object can then be accessed by the legacy protocol as regular protocol application data.
Example 3
The basic IEC 61850 application model of the protection relay produces a great amount of information. In some cases, this is more than what is feasible to transport through a legacy protocol. Via the PCM600/Communication Management tools, unnecessary data objects can be excluded from the legacy protocol.
However, in some cases a better solution is to OR together several internal signals into one general signal. This OR output can be connected to a general-purpose input and accessed by the legacy protocol as regular protocol application data.