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SPE as a Key Technology

Single Pair Ethernet: Paving the Way for Open Automation

Barrier-Free Data Transfer with Single Pair Ethernet

Single Pair Ethernet (SPE) is an important milestone in automation: It simplifies industrial communication and enables barrier-free data transfer – from the field level to the cloud.

In contrast to conventional ETHERNET, SPE requires only a single pair of conductors and is standardized by the IEEE. This new technology has the potential to reduce the number of network transitions, enabling seamless IP communication at best.

Speed, Consistency, Cost and Space Savings

Single Pair Ethernet has many advantages and is truly multi-talented. It also supports power transmission of up to 50 watts, cable lengths of up to 1000 meters, multiple outputs in line topologies and much more. The spectrum of applications is wide – especially in open automation: WAGO has recognized the potential of SPE and is working on a consistent networking of production, process and building technology systems to harness the benefits of this technology for customers.

End-to-End Communication from the Field Level to the Cloud

Single Pair Ethernet bridges all levels of the automation pyramid and paves the way for unimpeded data flow. This is especially true at the “last” mile, i.e., the field level, while providing greater bandwidth, so excessive data economy is a thing of the past. With its many different characteristics (including 10BASE-T1L, PoDL and multidrop), SPE is considered a key technology because it not only offers the potential to replace the previous communication cabling but it also creates a uniform communication basis.

“This makes SPE an accelerator for sensor-to-cloud communication, like the ones we used in Industry 4.0 and IIoT applications,” says Marco Henkel, Vice President of Technology Management at WAGO.

SPE Supports Interoperability and Power Transmission

The technology is standardized by the Institute of Electrical and Electronics Engineers (IEEE), which ensures interoperability between SPE devices from different manufacturers. In addition to data transmission, Single Pair Ethernet also supports power transmission – Power over Data Line (PoDL) – up to 50 watts on the same wire pair it uses for communication. This allows terminal devices that support PoDL – so-called powered devices (PD) – not just to be connected to information technology via fewer wires but also to be powered. No additional wiring is necessary for the power supply.
In addition, Single Pair Ethernet with “Multidrop” has something that today’s ETHERNET doesn’t: It allows multiple devices to be operated on one line via 10BASE-T1S without additional infrastructure components such as switches. In the future, this feature will also allow bus topologies in addition to the usual star topologies.

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