Ethernet-APL – time for a change of thinking!

Ethernet itself is a data transmission technology that enables data to be transmitted between different devices within a closed network. Ethernet-APL is therefore also a data transmission technology. The name stands for Ethernet Advanced Physical Layer.

This technology is based on the Physical Layer of Single Pair Ethernet (SPE) 10BASE-T1L in accordance with the IEEE Std 802.3cg-2019 specification. SPE uses two-wire conductors to bridge distances of up to 1000 metres with transfer rates of 10 Mbit/s and, optionally, to supply connected devices with power via PoDL (Power over Data Line). Ethernet-APL is similar to SPE but uses a supply concept that differs from PoDL for field devices, in order to enable use in hazardous areas with the intrinsic safety type of protection. Different plug connectors and clamping connections are also used in order to meet the requirements of process automation.

The solution is transparent for all Ethernet protocols, such as EtherNet/IP, HART-IP, OPC-UA and PROFINET. Additionally, the specification stipulates that fieldbus type A cables and existing shielding concepts can be used. This means that Ethernet-APL can be used in all areas, including all environments with an explosion hazard and in systems within the process industry.

Users and operators require a standardised network all the way to the field level in order to digitalise their systems. Large amounts of process data and increasing quantities of diagnostic and asset management data must be transmitted over some large distances in real time. New concepts such as NAMUR Open Architecture (NOA) and the Open Process Automation Standard (O-PAS™) require a powerful, flexible infrastructure. Devices and systems should be available on the basis of globally standardised technology from as many manufacturers as possible and act interoperably with one another.

For control system suppliers, the design of modern automation structures is much simpler with Ethernet-APL. This enables new, high-performance concepts for process control, system diagnostics and plant asset management to be created. Higher bandwidths all the way into the field offer new, comprehensive functionality and can provide real added value. This results in modern, future-proof systems with improved productivity and quality in a competitive environment.

A consistent Ethernet infrastructure in process systems simplifies planning, commissioning and troubleshooting for the EPC and system integrator. Changes and modifications can be made significantly more quickly and flexibly than in most current, inhomogeneous field installations. Ethernet-APL supports the known trunk/spur topology and the use of established communication protocols such as EtherNet/IP, HART-IP, OPC UA and PROFINET – this simplifies integration in existing and new systems.

Ethernet-APL opens up new opportunities when it comes to developing field devices. At bandwidths of 10 MBit/s, device manufacturers can design additional features and applications that offer their customers a real advantage. A variety of tools and services are already available as standard as IEEE-compliant Ethernet. The new 2-WISE concept for intrinsically safe Ethernet systems is based on an international standard that offers the user complete interoperability for installation in hazardous areas.