Single-pair Ethernet (SPE), under IEEE 802.3 standards, delivers data transmission of Ethernet over one pair of copper wires. This is in comparison to conventional Ethernet for industrial applications that require two or four pairs. It also enables simultaneous data and power transmission via power over data line (PoDL) over a single pair.
Called the next generation connectivity for industrial IoT (IIoT), the IEC 63171-6 standard for SPE is expected to open up new applications for industrial Ethernet as more companies integrate smart manufacturing and factory automation solutions. In addition to transmitting high data rates over a single twisted pair, other benefits include less space requirements, lower weight and cost savings.
Previously, two pairs of copper wires were needed for Fast Ethernet (100 MB) and four pairs for Gigabit Ethernet, said the SPE Industrial Partner Network, a consortium of over 50 networking companies.
TE’s SPE-M12 hybrid connectors (Source: TE Connectivity)
One of the most recent SPE additions is the standard (IEC 63171-7) for hybrid M12 single-pair Ethernet + power interfaces, originated by TE Connectivity, a member of the SPE Industrial Partner Network. The SPE-M12 hybrid connectors are expected to expand industrial applications for the SPE technology.
The IEC 63171-7 standard, adopted in May 2023, specifies hybrid interfaces with SPE and power contacts in the M12 format with screw locking and push-pull quick locking. TE said it applies to shielded, free, and fixed circular connectors for power and data transmission.
These hybrid interfaces also are reported to fit almost seamlessly into existing Ethernet infrastructures and enable plug-and-play connections.
Enabling the durability and safety required in harsh industrial environments, the “technology will allow higher levels of power to be transmitted in production plants and is a promising option for robotic systems, as well as servo and three-phase drives,” TE said.
How is this different from IEC 63171-6, which defines M8 hybrid connectors? The new standard addresses the M12 interface used in IP65 and IP67 environments and covers SPE-M12 hybrid connectors for different applications with power classes from 8 A to 16 A and from 50 V to 600 V, explained TE. “While previous concepts with PoDL are limited to 50 W, SPE-M12 hybrid connectors support powerful devices up to 11 kW and 16 A.”
The flexible hybrid configuration also makes it possible to distribute higher current levels to several cascaded power devices, added the company.
Molex industrial SPE connectors and cable assemblies (Source: Molex)
Molex, also a member of the SPE Industrial Partner Network, believes SPE-based solutions will close connectivity and control gaps in industrial networks paving the way to Industry 4.0.
“SPE delivers Internet connectivity and power directly to essential devices, eliminating the need for fieldbus configurations,” said Molex in a recent release, and “open IP protocol through SPE enables industrial operations to bridge the gap between the cloud and remote systems.”
Molex said SPE can achieve 10 Mbits/s per IEEE 802.3cg and 1 Gbits/s per IEEE 802.3bw and the company plans to reach 10 Gbits/s for a newly developed standard IEEE 802.3ch.
Belden also recently announced a SPE portfolio for industrial and automotive applications. The products include an IP20-rated PCB jack, patch cords and cordsets for clean-area connections and IP65/IP67-rated circular M8/M12 patch cords, cordsets and receptacles for field device industrial Ethernet connections, including predictive maintenance and digital twin applications.
The IP65/67 design protects against mechanical shock, vibration, dust, chemicals and temperature extremes and it is suitable for M3I3C3E3 environments. In addition, the cordsets are reported to be manufactured with 55% less metal and plastic than existing traditional Ethernet cordsets, delivering an improved carbon footprint and ESG rating without losing performance.
Fischer’s IIoT SPE and USB 3.0+ Connectors (Source: Fischer Connectors)
Also targeting IIoT applications in rugged environments, Fischer Connectors recently released ultra-robust SPE and USB 3.2 Gen 2 connectivity solutions. The SPE IIoT solutions include the Core Series and UltiMate Series that allow for 1 Gbits/s data transfer per IEEE 802.3bp – 1000Base-T1. Fischer SPE is compliant with MIL-STD norms via the UltiMate Series and offers 10,000 mating cycles, three locking mechanisms (push-pull, screw, quick-release) and hermetic sealing in addition to IP68/ IP69 ratings. SPE is also supported in the ultra-miniature MiniMax connector in size 06 (Ø 10 mm receptacle).
For USB 3.0+, the MiniMax connectors with USB 3.2 Gen 2 allow for 10 Gbits/s data transfer and offer additional power contacts up to 8 A. These connectors are said to be half the size of some competitor connectors at similar speed but no power.
Binder USA’s Series 808 M8 connectors (Source: binder USA)
Expanding the SPE M8 portfolio, binder USA recently introduced field-wireable M8 connectors. The are used for data and power transmission in factory processes and building applications. They meet IEC 63171-5 and 63171-6 standards for mechanical, electrical, test specification and mating faces.
The Series 808 is available in two- and four-count versions and shielded or unshielded. It uses a screw-locking mechanism.
If you’re looking for SPE-supported solutions, the SPE Industrial Partner Network offers a database for SPE products. Categories include connectors, cables, passive components and semiconductors. It also includes active components and SPE devices.
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