Technical Paper Abstract
EtherNet/IPTM In-Cabinet has introduced an innovative approach for connecting industrial control components by replacing traditional point-to-point hardwiring with a shared Single Pair Ethernet (SPE) communication medium. The technology enables direct EtherNet/IP connectivity to low-cost industrial devices such as pushbuttons, contactors, motor starters, and signaling devices, while reducing wiring complexity, engineering effort, testing time, and panel footprint. As adoption increases, users are requesting functional safety capabilities that provide equivalent or improved safety performance compared to conventional hardwired architectures.
This paper examines the integration of CIP SafetyTM into EtherNet/IP In-Cabinet systems using the existing CIP Safety specification and UDP-only transport profile. Technical challenges associated with safety deployment are evaluated, including electromagnetic compatibility (EMC) robustness, communication latency, and system safety response time. Enhanced communication interface designs are presented to address stricter EMC requirements for safety-certified products. In addition, safety response time budgets are analyzed to identify limiting factors and potential optimization opportunities.
The paper further explores key standards, including new IEEE 802.3da (10BASE-T1M) features, including compatibility with existing 10BASE-T1S multidrop networks, and new capabilities that may enhance future EtherNet/IP In-Cabinet implementations. Finally, the paper discusses ecosystem expansion through development toolkits, reference hardware platforms, and third-party implementation support, enabling broader industry adoption and multi-vendor interoperability.
Keywords
EtherNet/IP In-Cabinet, Constrained-Node Networks, APL, In-Cabinet, Common Mode Choke, Ethernet, IEEE 802.3, IEEE 802.3cg, EtherNet/IP Constrained Device Toolkit, IEEE 802.3da, 10BASE-T1S,10BASE-T1M, Single-Pair, SPE, Industrial Automation, Process Automation, Fieldbus, ODVA, Reference Topology, Network Power, Select Line, Select Line Protocol, Network Commissioning, Safety, Safety Response Time.
Paper and presentation from the 2026 ODVA Industry Conference & 24th Annual Meeting: to be published November 2
Yutao Wang, Principal Engineer, TUV Functional Safety Engineer, Cyber Security Specialist, Rockwell Automation
David Brandt, Engineering Fellow, Rockwell Automation
Jeff Martin, Senior Project Engineer, Rockwell Automation
Amsale Abera, Global Product Manager, Rockwell Automation