Single Pair Ethernet
Single Pair Ethernet is a physical layer that brings both data and power via one twisted wire pair at an optimal cost to smaller, simpler, and harder to reach devices. There are many different SPE standards such as 10BASE-T1S that permit multidrop short reach applications of 25 meters or less, 10BASE-T1L that enables point to point connections of up to 1,000 meters, and other standards like 100BASE-T1 that are used for high-speed automotive applications. As a physical layer, SPE enables the usage of the EtherNet/IP industrial Ethernet network for field device communication and control.
Two key SPE solutions are Ethernet-APL for process automation field instruments in hazardous areas along with EtherNet/IP In-Cabinet that connects small devices with limited capabilities located in a cabinet to the Ethernet network. Ethernet-APL makes it possible to potentially reuse existing Type A fieldbus cable already installed in process plants (100 ohms resistance, +/- 20 ohms tolerance), to safely install devices in hazardous areas without calculations with 2-WISE, and to connect devices spread throughout a plant. EtherNet/IP In-Cabinet allows for efficient cabinet build times as well as the ability to gain new status diagnostics from devices that were previously not connected to the network.
SPE can allow for connection of more field devices to the network enabling predictive maintenance, automated topology mapping and asset tracking, and additional diagnostic data availability.