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 / GE Drive Systems / GE HMI 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)