The hottest single pair Ethernet SPE in process an

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Single pair Ethernet (SPE): in process and factory automation,

although factory automation networks are mainly based on Ethernet standards, the application of Ethernet in the field of process automation is still developing. In order to enable and solve the business model of industry 4.0 and industrial interconnection, Namur released the open architecture (NOA), which defines the concept of communication across all layers of the cloud. Namur also published a paper to determine that the future network in process automation will be IP network with Ethernet. Fieldcomm group, together with PI and ODVA, formed a working group, which greatly promoted the progress of IEEE and determined their system requirements for rapid application in the field of process automation

the above figure shows different areas in the process industry, including different levels of intrinsic safety and loop powered or separately powered equipment in hazardous areas (such as zone 0). The network itself uses well-known branch and relay topologies, including power supply for up to 50 devices, and the maximum current of each device is 500mA. In addition, existing cables and equipment can be reused to reduce system design and integration time. Therefore, the focus of the process industry is to constantly replace the existing "king of plastics" with APL; Some fieldbus devices

application in factory automation

different from process industry, industrial Ethernet is the leading network in the factory automation industry at present. However, this also limits the benefits of SPE to smaller footprint, smaller cable weight, longer cable length, stronger durability, and easier installation and maintenance through a tool environment

the challenge now is to bring these advantages into the existing IP based networks, which already support many data-driven business models. The challenge is multifaceted. Some industrial Ethernet standards do not have 10mbit transmission speed in their specifications, or only up to 50% are included at the beginning

several sensor manufacturers (as the main driving force of APL for process automation) began to actively adjust their needs according to IO link standards as early as 2007. IO link supports parameterization, diagnosis and full integration into the industry 4.0 ecosystem. However, if IO link data frames are to be transmitted on a 1000m SPE, the previous point-to-point sensor network will be converted into a fieldbus. Although there are some technical problems, a key point of factory automation is to continuously benefit from SPE technology. PI and OD realize the speed control of the moving beam of the experimental machine. The teams in VA and IO link are currently discussing and evaluating these application cases and potential integration scenarios in accordance with the requirements of the "zero growth action plan of fertilizer application". IO link alliance published a white paper, which contains some deployment scheme examples (IO link alliance, 2020). Scenarios for installation in Brownfield:

the above example allows the IP67 SPE master station to be integrated into the existing installation of IO link and binary sensors and devices. The proposal in the white paper mainly uses SPE as the transmission medium of IO link data frames

through the Ethernet based IO link adapter software, you can maintain the existing infrastructure and install active devices, maintain the data format, expand the scope of use, and reflect the advantages of SPE

Germany heyouxun participated in several working groups of pi to promote the development of SPE related to PROFINET. Heyouxun also contributed to the IO link working group, which evaluated the benefits and challenges of integrating the two standards into the field. In IEEE, heyouxun participated in the discussion of unresolved topics in 802.3cg standard, and also participated in the discussion of ODVA on SPE topic. The goal of heyouxun is to help build the migration path, easily integrate SPE into the existing industrial network system, and support this through communication technology and product capabilities

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