One of the most challenging first steps in PLC programming is connecting to the hardware. Within the ControlLogix family of Allen Bradley PLCs, this connection is established through a dedicated EtherNet / IP card (Note: the 1756-L8x PLCs have dedicated EtherNet ports and no longer require a separate module). These cards have been changed and upgraded since the initial release of the platform and multiple issues have been resolved. However, it’s still important to know how to work with them as many plants employ older versions of these modules.
This is a companion discussion topic for the original entry at https://www.solisplc.com/tutorials/1756-enbt-controllogix-ethernet-ip-communication-allen-bradley-plc-1756-en2t-1756-en3t-programming