The vast number of available networks makes it a daunting task to pick one (or several) to best meet the needs of a particular application. This has probably hindered the use of networks in controls applications. The intent here is to discuss the process of picking a network best suited to an application, and not to compare the specific capability of different networks.
Fisher-Rosemount recently contracted with ARCO-Alaska Inc. to install the world's first F OUNDATION Fieldbus on an oil production site at ARCO's West Sak facility on Alaska's North Slope. Expected to begin this past December, the project's initial phase includes 50 oil wells.
Increasing installations and good market performance indicate that highway addressable remote transducer (HART) technology will continue to be widely used in process plants for at least the next 15 to 20 years, according to the HART Communication Foundation (Austin, Tex.
More users, system integrators, and manufacturers of control hardware and software are realizing the benefits of digital networks at the sensor, device, and fieldbus levels.In this kickoff of the "Year of the Network" series, Control Engineering asked leaders associated with 12 major industrial networks to reveal growth projections, ideal applications, views on standards, and future out...
Traditionally, process variables are considered to be units of flow, level, pressure, or temperature, and the media measured include gases, liquids, slurries, powders, and solids (see table).Transmitters are devices that accept the output of sensors and transducers designed to detect process variables and produce an output which directly or proportionally alters as process variables change.
Engineers and managers interested in electricity or automation will likely discover that ELEC '98 is the biggest trade show in Europe this coming autumn. The exhibition will be held on Dec. 7-11, 1998, at the Paris-Nord Exhibition Centre. ELEC '98 organizers say 24% of the 600 already-signed exhibitors are new to the show.
Fisher-Rosemount recently contracted with Avenor Inc. (Montreal, Quebec, Canada), an international pulp and paper company, to install a Fieldbus Starter Kit in the kraft paper area at Avenor's 1,200 tpd mill in Gatineau, Quebec. The facility uses kraft pulp in newsprint production to achieve specific quality characteristics.
As controls and automation become more distributed and integrated, industrial communication networks and buses are becoming more crucial because they link controls with real world, in-the-trench, manufacturing processes. However, due to growing choices of networks, protocols, buses, and node connections, it is helpful to understand the basic aspects of each network or bus before picking an overall architecture. Physical topologies include linear buses (with drops), and daisy-chained, ring (where all nodes are connected in a physical ring), star, and mixed types. Each has its own advantages and drawbacks. Bus arbitration schemes include master-slave and peer-to-peer (CSMA or collision sense/multi-access, and token-passing).
BUS OF THE MONTH: WorldFIP
Boeing Explores Development of ‘Smart’ Transducer Bus Lee Eccles of Boeing Commercial Airplane Co. began his presentation in the ‘Use of Automation to Enhance Productivity in the Aerospace Industry’ by asking the question ‘why bother?’ In structural sensing and testing of airplane wings and fuselages at Boeing, a lot of effort goes into simply setting up the test. Structures for destructive testing of a wing or testing flight-control actuators require huge setup times.