Saturday, November 7, 2015

Proxy and Gateway Approach of IEC 61850

A Proxy Server in the sense of IEC 61850 exposes the very same information models of many IEDs through a Server that uses the same Logical Device/Logical Node names (references) as in the IEDs that are “mirrored” or “proxied”.

There is no difference in the meaning and syntax between the models in the various IED Servers and the Proxy Server.

The general gateway approach is quite different. I a gateway we are free to manage information like:

  1. Translate data from legacy protocols such as IEC 60870-5-103, IEC 60870-5-104, IEEE 1815 (DNP3), IEC 61158-6 (Modbus), etc. into IEC 61850 data model
  2. Add data local to the IED hosting the Proxy/Gateway
  3. Rename logical devices coming from IED level into logical device server
  4. Rearrange/Rename logical nodes coming from IED level into logical device of the Proxy/Gateway server
  5. Merge of two or more information objects coming from two or more different logical nodes at IED level into one logical node of the Proxy/Gateway server
  6. Split of information objects coming from one logical node at IED level into two or more logical nodes of the Proxy/Gateway server where each logical node contains a subset of the information objects of the original logical node
  7. Transform a generic information object (e.g. GGIO, GAPC, etc.) at IED level into a semantically defined information object of the Proxy/Gateway server
  8. Convert a specific information object (e.g. MMTN) at IED level into another semantically defined information object (e.g. MMXU) of the Proxy/Gateway server
  9. Adapt the scale, information encoding and dead band configuration between the IED data object and the data object in the Proxy/Gateway server
  10. Logical (e.g. and, or, if/else, grouping of indications, etc.) and arithmetic (e.g. multiplication, division, addition, subtraction, etc.) transformations between one or more data objects at IED level and one or more data objects of the Proxy/Gateway server

Real IEDs may have gateway and proxy functions.

Click HERE for very simple and easy to use proxies and/or gateways for IEC 61850, IEC 60870-5-104, Modbus, Profibus, Profinet, … offered by HMS. These can be understood as Micro-RTU …

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