ODVA extends Ethernet/IP specification to in-cabinet resource-constrained devices

April 12, 2021
The sustained growth of EtherNet/IP combined with accelerating IT/OT convergence has made it possible to deploy EtherNet/IP within cabinets on lower-level automation devices such as contactors and push buttons

ODVA announced that The EtherNet/IP Specification has been enhanced to allow vendors to bring the network to resource-constrained devices in-cabinet, including push buttons and contactors.

The trade and standard development organization credits the continued decrease in the cost of semiconductor chips as an enabler in increased connectivity of simple devices. The sustained growth of EtherNet/IP combined with accelerating IT/OT convergence has made it possible to deploy EtherNet/IP within cabinets on lower-level automation devices such as contactors and push buttons.

The inclusion of resource-constrained devices within cabinets on an EtherNet/IP network is enabled by recently published enhancements to The EtherNet/IP Specification including the physical layer In-Cabinet Profile for EtherNet/IP along with low overhead UDP-only resource-constrained EtherNet/IP communication. Resource requirements have been reduced via enhancements such as an IT friendly LLDP node topology discovery mechanism, auto-commissioning support and auto-device replacement support. A specification for a new select line circuit facilitates the efficient delivery of system wide sequential commands.

The EtherNet/IP in-cabinet bus solution reduces interface components through use of single pair Ethernet (IEEE Std 802.3cg-2019 10BASE-T1S) and reduces node cost via multidrop cabling that spans a single cabinet with one interface per device and one switch port that supports many devices. Cost is reduced via cables that use composite network and control power to eliminate separate parallel runs. The select line for topology eliminates configuration switches by enabling discovery based on relative position and allows for direct connection with programming tools during assembly for parameterization. Assembly time is lowered by eliminating most wire or cable preparation with insulation displacement (piercing) connectors. Nodes will also be able to be replaced with compatible nodes of the same type during normal system operation without any engineering tools in a plug and play manner.

The extension of EtherNet/IP for in-cabinet resource-constrained devices will reduce hardware requirements enabled by UDP-only EtherNet/IP communication, usage of single pair Etherne, and shared in-cabinet external power and cabling. Adding low-level in-panel devices to the network will enable the benefits of additional remote diagnostics, asset information and parameterization capability, automatic node topology discovery and plug and play device replacement.

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