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Ethernet Global Data Protocol

In today's world, Ethernet Global Data Protocol has become a topic of great importance and interest to a wide spectrum of people. From amateurs to experts, Ethernet Global Data Protocol has captured attention and generated debate in multiple areas of society. Its impact has transcended geographical and cultural barriers, being the object of study and analysis in different disciplines. In this article, we will explore various aspects related to Ethernet Global Data Protocol, from its origin and evolution to its implications and possible future developments. Whether it is a historical phenomenon, a relevant figure or a current topic, Ethernet Global Data Protocol represents a meeting point for the exchange of ideas and knowledge, and it is necessary to understand it in its entirety to contextualize its relevance in our society.

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Ethernet Global Data (EGD) is a protocol that enables producer (server) to share a portion of its memory to all the consumers (clients) at a scheduled periodic rate. This protocol is developed for GE Fanuc PLCs to exchange data between PLCs / Drive Systems / HMI/SCADA systems. The protocol uses UDP over Ethernet layers for exchanging the data. A snapshot of internal reference memory, mediated by an Ethernet interface, is referred to as an exchange. An exchange does not require a reply and is identified by a unique combination of three major identifiers.

  • The Producer ID (the producer's IP address)
  • The Exchange ID (the exchange's identifier)
  • The Adapter Name (the Ethernet interface identifier)

EGD is implemented using classes.

  • Class 0 - supports configured exchanges only (implemented in most PACSystems CPUs)
  • Class 1 - supports all class 0 services plus programmed EGD exchanges that can be used to read and write other devices on an ad-hoc basis
  • Class 2 - supports all class 1 services plus acts as a responder for programmed EGD exchanges (implemented by Ethernet interface module only)
  • Class 3 - supports all class 2 services plus static configuration from an EGD configuration server
  • Class 4 - supports all class 3 services plus dynamically bound configuration from an EGD configuration server
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