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Advantages of Fieldbus | ||
The fieldbus has a multitude of advantages that the end users will benefit from. The major advantage of the fieldbus, and the one that is most attractive to the end user is its reduction in capital costs. The savings attained by the user stem from three main areas, initial savings, maintenance savings, and savings due to improved systems performance. Reduction in capital costsInitial Savings One of the main features of the fieldbus is its significant reduction in wiring. Each process cell requires only one wire to be run to the main cable, with a varying number of cells available. The cost of installing field equipment in a fieldbus system is thus significantly reduced. Installation costs are further reduced due to the fact that the fieldbus it is a multi-drop rather than point-to-point system and the multidrop network can offer a 5:1 reduction in field wiring expense. The price of equipment is reduced significantly in a fieldbus system, with savings of approximately $50 per field device possible. The fieldbus system requires less labour to install than conventional bus systems, and saves money due to a reduction in materials needed for the installation. The simpler system design implies that fewer system drawings will be needed in order to develop a fieldbus system. This also has the advantage that the simpler design will result in less complex and faster bus systems. Maintenance SavingsMaintenance Savings The fact that the fieldbus system is less complex than conventional bus systems implies that there will be less overall need for maintenance. The simplification of systems means that the long term reliability of the bus system is increased. With the fieldbus system, it is possible for the operators to easily see all of the devices included in the system and to also easily interpret the interaction between the individual devices. This will make discovering the source of any problems and carrying out maintenance much simpler, and thus will reduce the overall debugging time. The debugging and maintenance of the system will also be enhanced due to the fact that fieldbus enables online diagnostics to be carried out on individual field devices. The online diagnostics include functions such as open wire detection and predictive maintenance and simplify tasks such as device calibration. Improved Systems PerformanceImproved Systems Performance Fieldbus allows the user increased flexibility in the design of the bus system. Some algorithms and control procedures that with conventional bus systems must be contained in control programs can now reside in the individual field devices, reducing the overall size of the main control system. This reduces the overall systems cost and makes future expansion a simpler prospect. System performance is enhanced with the use of fieldbus technology due to the simplification of the collection of information from field devices. Measurement and device values will be available to all field and control devices in engineering units. This eliminates the need to convert raw data into the required units and will free the control system for other more important tasks. The reduction in information complication will allow the development of better and more effective process control systems.
With fieldbus technology, two-way communication between field devices and the control system is made possible. System performance is enhanced due to the ability to communicate directly between two field devices rather than via the control system. This also enables several related field devices to be combined into one device.
With fieldbus technology, field instruments can be calibrated, initialised, operated and repaired faster than most conventional analog instrumentation. this leads to an overall reduction in time required to operate the fieldbus system. Other AdvantagesOther Advantages As well as the cost advantages that fieldbus technology embodies, there are many other miscellaneous advantages that are included in the fieldbus package. Although it is a major challenge trying to develop a single worldwide protocol for process control, there are currently only two real protocols for fieldbus, being ISP and WorldFIP and while there is still two protocols rather than a world standard, it is better than a possible many. Work is being done to merge the two protocols into a standard which will be a major advantage. The fact that eventually all fieldbus equipment will be standardised will mean that expansion of a system or addition of field devices will be extremely simple, requiring no interfaces or converters.
The fieldbus protocol involves only four layers and a set of management services. Fieldbus has the advantage that the user should not have to be concerned with the Data Link layer or the Application layer. As far as the end user is concerned, they should simply work. The user will only be required to have a limited knowledge of the management services, because some of the information generated by them will be needed if a problem occurs in the system. In fact, it should only be necessary for the user to concern themselves with the Physical and User layers. Copyright 2008 - France BtoB from Wikipédia
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