https://rs-485.com/index.php?action=history&feed=atom&title=Ethernet_Global_Data_ProtocolEthernet Global Data Protocol - Revision history2026-05-04T00:54:28ZRevision history for this page on the wikiMediaWiki 1.42.3https://rs-485.com/index.php?title=Ethernet_Global_Data_Protocol&diff=1545&oldid=prevRS-485: Imported from Wikipedia (overwrite)2026-05-03T13:47:41Z<p>Imported from Wikipedia (overwrite)</p>
<p><b>New page</b></p><div>{{Short description|Automation Protocol}}<br />
{{One source|date=March 2026}}<br />
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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.<br />
This protocol is developed for [[GE Fanuc Automation North America, Inc.|GE Fanuc]] [[Programmable logic controller|PLC]]s to exchange data between PLCs / Drive Systems / HMI/SCADA systems.<ref>{{cite report<br />
|title=SmartStack™ Ethernet Modules<br />
|year=2006<br />
|publisher=Horner APG, LLC<br />
|location=Indianapolis, Indiana<br />
|id=SUP0740-07<br />
|type=Product manual<br />
|url=https://elit.ee/docs/horner/manuals/ETN200.pdf<br />
|archive-url=https://web.archive.org/web/20260325133141/https://elit.ee/docs/horner/manuals/ETN200.pdf<br />
|archive-date=2026-03-25<br />
}}</ref><br />
The protocol uses [[User Datagram Protocol | UDP]] over [[Ethernet]] layers for exchanging the data.<br />
A snapshot of internal reference memory, mediated by an [[Ethernet]] interface, is referred to as an exchange.<br />
An exchange does not require a reply and is identified by a unique combination of three major identifiers.<br />
* The Producer ID (the producer's [[IP address]])<br />
* The Exchange ID (the exchange's identifier)<br />
* The Adapter Name (the Ethernet interface identifier)<br />
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EGD is implemented using classes.<br />
* Class 0 - supports configured exchanges only (implemented in most PACSystems CPUs)<br />
* 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<br />
* Class 2 - supports all class 1 services plus acts as a responder for programmed EGD exchanges (implemented by Ethernet interface module only)<br />
* Class 3 - supports all class 2 services plus static configuration from an EGD configuration server<br />
* Class 4 - supports all class 3 services plus dynamically bound configuration from an EGD configuration server<br />
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==References==<br />
{{reflist}}<br />
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==External links==<br />
* [https://cscapehelp.hornerautomation.com/Content/HW_Config/ETN-EGD.htm Ethernet Global Data Protocol (EGD)]<br />
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{{List of Automation Protocols}}<br />
[[Category:Industrial computing]]<br />
[[Category:Industrial Ethernet]]</div>RS-485