Using Cable Redundancy Mode

NI-Industrial Communications for EtherCAT® 17.6 Help

Edition Date: November 2017

Part Number: 372626P-01

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  • Enable Cable Redundancy—Once the hardware is properly set up, use the Refresh Modules VI to automatically enable cable redundancy and discover devices. Use the EtherCAT master properties Cable Redundacy.Enable and Cable Redundancy.Redundancy Master ID to check whether cable redundancy is enabled on the master and whether the redundant adapter is associated with the master.
    Note Note   Logical Read Write (LRW) whenever possible is automatically disabled when cable redundancy is enabled.
  • Disable Cable Redundancy—To disable cable redundancy, simply unplug the cable connected to the redundant adapter and call the Refresh Modules VI again.
  • Broken Cable Detection—When a cable is broken while reading/writing IO variables, a warning will be reported from LabVIEW indicating that some cable is broken and the values of IO variables are still valid. Use the EtherCAT slave method GetPortLinkStatus to detect which connection is broken.
  • Distributed Clocks—In cable redundancy mode, if you enable distributed clocks for slave devices, the target time will be distributed to the slave. All the slaves that enables distributed clock can be synchronized using SYNC0 in either SafeOP or OP state. If one of the cables is disconnected in the network, the primary master keeps distributing the time to the slaves. So the slaves that connect to the primary master will keep synchronized, while those connect to the redundant master may run out of sync after a certain period of time.

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