Introduction
Two-way Communication Feature of FOUNDATION fieldbus™ Reduce Total Cost of Ownership
FOUNDATION fieldbus technology enables all-digital, two-way communications between field devices and control systems. While the advantages of using digital communications for sharing maintenance-related device information with an asset management system are well known, there are other benefits from using the FOUNDATION fieldbus technology. This paper introduces an application that relies on the two-way communications capability of FOUNDATION fieldbus.
Expected Benefits
Reduced total cost of ownership (TCO) by eliminating the need for local display panels.
Application
As shown in figure 1, gas flow is calculated by a remote terminal unit (RTU) using process data received from a transmitter. Although such data can be monitored on a SCADA system, a display panel is required to monitor the gas flow on-site.
Fig.1 System configuration using 4-20mA
| What is 4-20mA? 4-20mA is an analog signal that has been used as a process signal for decades. It is limited to sending process data. |
Solution
With conventional 4-20 mA communications, it is impossible to send the data calculated by an RTU back to a transmitter because this technology only supports one-way communications. However, as shown in figure 2, gas flow data calculated by an RTU can be sent back to a transmitter using the two-way communications capability of FOUNDATIONfieldbus. The gas flow data can thus be displayed on the transmitter's LCD, eliminating the need for the use of a local display panel or hand-held terminal.
Fig.2 System configuration using FOUNDATION fieldbus
Process data measured by transmitter (INDEX 1-3), output data calculated on RTU (INDEX 4-6) and configuration parameters set to RTU (INDEX 7-10) are periodically displayed on transmitter's LCD with measurement units and comments.
| What is FOUNDATION fieldbus? FOUNDATION fieldbus provides all-digital communication. It provides two way communications between devices and their information in addition to process data. |
Customer Site
The United States Department of the Interior Bureau of Land Management (BLM) published a notice of the minimum standards and requirements for the sale and allocation Electronic Flow Computers (EFCs) in 2008. The requirements for EFC displays are mentioned in this notice. "The display shall be readable on site without the need for data collection units, laptop computers or any special equipment, shall be onsite, and shall be in a location that is accessible to the BLM."
To meet these requirements, Yokogawa Corporation of America proposed using the transmitters' LCD as a substitute for local display panels, reducing the total cost of the ownership (TCO) of the projects.
Industrieën
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Offshore (FPSO FLNG & FSRU)
Offshore exploratie en productie vereist maximale uptime onder zware omstandigheden. Bemande en onbemande installaties hebben behoefte aan betrouwbare geïntegreerde controle- en veiligheidssystemen (ICSS) met geavanceerde mogelijkheden voor bewaking op afstand. Yokogawa beschikt over ultramoderne technologie en uitgebreide ervaring in de uitvoering van offshore projecten van elke omvang en complexiteit van de automatisering.
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Olie & gas
Yokogawa heeft diepgaande ervaring in elk deel van de olie- en gasindustrie. Van offshore- en onshore-installaties tot pijpleidingen, terminals en diepwateractiviteiten. Wij leveren oplossingen die de veiligheid verhogen, een nauwkeurige en betrouwbare werking garanderen en de efficiëntie van de installatie verhogen.
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Upstream olie & gas
De upstream-industrie omvat offshore- en onshore-activiteiten, waaronder automatisering van boorputten, raffinage, voltooiing en scheiding om ondergronds of onder water ruwe olie en aardgas te winnen en te bewerken.
Wanneer aardolie naar de oppervlakte wordt gebracht, moet het worden gescheiden voordat het wordt vervoerd. Primaire en secundaire scheidingsfasen verdelen gewoonlijk de gasstroom, waterstroom en oliestroom in een driefasen scheiding. Voor het vervoer van gas is een pijpleiding nodig en kan een raffinageproces in de upstream fase voorafgaand aan het vervoer plaatsvinden. Vloeistoffen kunnen via tanks of pijpleidingen voor verwerking worden verzonden, waarbij nauwkeurige niveaumetingen vereist zijn.
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