Ethernet Global Dated
Ethernet Global Dated ( EGD ) is a industrial Communication protocol between programmable automats.
It was initially developed by GE Fanuc in 1998.
It uses UDP like Couche of transport. It uses IP and Ethernet for the sub-bases, which explains its name.
Principle
Contrary to other protocols like OPC or Modbus, there are not a mechanism of the request type/answer. Each producer of data diffuses those of his own initiative ( unsollicited messaging , i.e. “not requested messages”). Any consumer of data connected on the network there has access, and decides if it is concerned or not (this mechanism is not without pointing out the Bus EDGE).
This principle is advantageous when there are many consumers for each produced data, since the load of the network is minimal (not requests, single Diffusion). It makes it possible in particular to create “mirrors” data between many automats connected in network without requiring a Band-width important.
See too
Internal bonds
- OLE for Process Control (OPC)
- Drunk ground
External bonds
-
AzeoTech
- FieldServer - Fieldbus FS-8704-12 (pdf, 5 pages)
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