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Although the summation frame procedure used by protocols such as Ethercat have been shown to have advantages on the linear topologies of simple machines at transmission rates of 100 Mbps, they only do so when less than 60 bytes of user data need to be transmitted for each device. By contrast, data delivery via individual frames, the technique used by ProfiNet IRT, allows shorter cycle times, if the processing times in the devices and the “telegram” overhead are reduced and the so-called “drafting” effect is used.
The study has also found that ProfiNet’s data delivery via individual frames benefits more from increasing bit rates of, for example, 1000 Mbps than other transmission methods. Moreover, for larger amounts of user data in the branching topologies used in more complex systems, the transmission method used by ProfiNet IRT always yields performance advantages compared with protocols using summation frame techniques.
Phoenix contact and its partners plan to demonstrate prototype systems based on their findings at the Hanover Fair in April 2008.
Typical of the new projects is that for Tropical Bioenergia which includes some 1000 Profibus nodes supervised by 15 Smar DFI302 DF73 controllers and overseen by Smar’s System302-7 decentralized architecture hybrid control system. Smar has also recently signed a contract with Santa Elisa Distillery, a subsidiary of major sugar ethanol producer Santelisa-Vale Group (SVG), for the complete automation of four new plants. In each case, Smar will supply its System302-7 control system together with complete Profibus- enabled field instrumentation, controllers and control panels. The project also involves provision of a Center of Integrated Operations (COI) based on a successful Smar system previously implemented for Santa Elisa. Smar will be supplying more than 3200 Profibus PA field instruments and four supervisory control systems. In addition AS-I technology will be used for the control of the on-off valves and sensors. Two of the four units are due to begin operation in July 2008 with the other two starting up in May 2009. A further joint venture project of similar scope between SVG and Maeda Group is due to start up in early 2008.
All of these projects are integrated with Smar’s Studio application, which is a System302-7 component that allows complete management of a project’s software requirements.
Honeywell has entered into a six-year agreement with BP Exploration to provide main automation contractor (MAC) services at its new and existing facilities with the aim of accelerating production schedules and improving efficiency by integrating all levels of plant operations and automating critical processes.
“Automation will be a key to streamlining operations and improving business performance as we move into the future,” said Tim Bass, BP Exploration’s director of procurement and supply chain management, projects and engineering. “Honeywell has the tools and experience to enable BP to implement its automation strategy, improving integration and the operating efficiency of our assets.”
As the MAC services provider, Honeywell plans to apply an integrated strategy to each design phase, including front-end engineering development, early operator training and process simulation, advanced control modelling, process validation and advanced process control. Honeywell says the integrated approach will result in common interfaces across production and business systems for increased safety and efficiency, higher plant availability, lower operating expenditures and reduced engineering. The integrated MAC approach will allow BP to draw on Honeywell’s process control, MES and safety and security solutions as well as wireless-enabled applications.
The entire control system will be integrated through Experion with Field Device Manager and Asset Manager helping operators efficiently to monitor and diagnose field devices, and the Uniformance PHD data historian providing efficient and effective data analysis. Honeywell will provide consulting services and applications to assist operators in sorting and prioritizing system alarms.
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