Monday, August 11, 2008

IEC 61850 for real-time communication

Ethernet is used for many years for real-time applications - most of the solutions use some dedicated hardware or software. IEC 61850 is sometimes understood as a solution that provides protocols and information models running on top of TCP/IP only ... as shown in the Industrial Ethernet Handbook.

IEC 61850 supports the exchange of real-time traffic:
  • Peer-to-peer exchange of staus and other simple information by the so-called GOOSE message (Generic Object Oriented Substation Event) - you may replace substation by system ... GOOSE uses Ethertye and multicast messages. Requirement to meet: delay of max 4 ms after failure in the electrical network. GOOSE messaging could be understood as remote I/O communication.
  • Peer-to-peer exchnage of sampled values of voltage and current measurements (80 or 256 samples/period - 4 kHz for 50 Hz system and 80 samples/period) (Sampled Value exchange. Samped Value exchange uses Ethertye and multicast messages.

All communication of the client/server for reading, setting, control, reporting, logging, retrieving self-description, ... is using TCP/IP and higher layer protocols.

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