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easYgen-3500XT Redundant Network Communication - Knowledgebase / easYgen-3000XT / communication - Power Generation

easYgen-3500XT Redundant Network Communication

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Short description of the Easygen3000XT redundant network communication


Basics

  • The system is not PRP, but a Woodward own system. It resembles PRP, however.
  • Every device sends cyclically UDP messages with process data on both ports simultaneously
  • Cycle time is typically 80msec
  • The data on both ports are identical
  • Messages are broadcast messages and every device listens to all messages from all other devices on both ports
  • Every UDP message has a sequence number
  • When a device receives a UDP message on either of its two ports
    • If a message with the same sequence number was already received on the other port, it is discarded
    • Otherwise the messages is processed
  • There is a teach in mechanism at setup, to tell all device in a system who are the others in the system and from whom messages are to be expected
  • There are timeout monitorings



Fail Over

  • The system tolerates disruptions/break of one Ethernet line. As long there is at least one of the both lines active, there will be no influence on operation.
  • There is no fail over mechanism if a device completely fails, and a second (until then dormant) device would have to take over.