HART communication*1 is a means of transmitting multiple signals by superimposing long-standard 4-20 mA DC analog signals on digital signals.
The figure below is an example of connecting field instruments and upstream devices using HART communication compatible VJA1/H, VJH1/HC signal conditioners. With these signal conditioners, you can output analog control signals as well as TAG and other measuring information from the field instruments to the upstream devices, and at the same time output analog signals to recorders and other monitoring devices. Additionally, the upstream devices can perform zero point/span adjustment and set various parameters on the output devices in the field (HART communication enabled control valves, etc.).
Note: This requires that the devices on both the field and DCS sides can send and receive HART signals, and the parameters that can be set depends on the specifications of the devices performing HART communication.
*The above configuration also allows for D-series nest-housed converters (DA7, DC7).
*1: HART stands for "highway addressable remote transducer."
HART was put forward by Fisher-Rosemount Corp. (USA) as an open standard for industrial control field networks. There is currently an organization called the HCF (HART Communication Foundation). Used extensively throughout the world, the standard defines a communication protocol through which digital signals are superimposed on analog signals, and transmitted.
Products
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Compact Plug-in Type JUXTA VJ Series |
Compact Plug-in Type JUXTA VJ Series
- Compact design for space saving
- Universal input
- Comes standard with 2 isolated current outputs (4–20 mA DC/4–20 mA DC)
- Globally compatible power supply (85–264 VAC/DC, 12–36 VDC)
- Standard withstand voltage of 2000 V
- Compliance with international safety standards
- Relaying HART communication signals (VJA1/H, VJH1/HC)
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| Nest Type for DCS JUXTA D Series |
Nest Type for DCS JUXTA D Series
- High affinity with DCS systems
- Easily maintainable card format
- Mixed mounting of Electronic and Pneumatic signal conditioners
- Designed to minimize usage of aluminum electrolyte capacitors
- Standard second output
- Relaying HART communication signals (DA7, DC7)
Industrieën
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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.
Gerelateerde producten & oplossingen
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JUXTA D Series Signal Conditioners
The D Series is DCS-supported signal conditioners, consisting of modular type signal converters with versatile I/O specifications and housing nest. JIS and EIA conformed mounting nests come with terminal blocks for field wiring, connectors for DCS connection, and connectors for communications.
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JUXTA VJ Series Signal Conditioners
Compact size, plug-in style and microprocessor based high performance capabilities (Multi-function types) makes the VJ Series Signal Conditioners an excellent choice for almost every application. Analog output, Hi-Low alarm relay outputs or RS-485 MODBUS communication is available as optional second output.