Allen Bradley CompactLogix PLC Values Does Not Update Using the EtherNet/IP API

Updated Feb 25, 2019

Reported In


  • NI-Industrial Communications for Ethernet/IP 17.0

Issue Details

I am trying to run an example VI using the EthernetIP API for LabVIEW. However, even though the VI is running, it does not seem to read or write data from/to the CompactLogix PLC. No error is occurring in the VI, not even if I change the PLC IP address to a wrong one on purpose.


Verify the Network Path input string is specified with the proper syntax.

The syntax for a simple system is <PLC address>,<backplane port number>,<Logix slot number>. For example,,1,0 is the routing path for a ControlLogix 5561 with IP address and with the processor in slot 0 of an AB-1756 4-slot backplane.


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