Getting measurement and control signals to and from your instruments is central to your automation strategy. Yokogawa supports a wide variety of Fieldbus technologies, including conventional 4-20mA, wired digital networks, and wireless ISA100.11a. These technologies are employed at the device, host, and solution level, depending on your needs.
Data acquisition measurements (voltage, analog voltage, analog current, and themocouples) across large physical distances can prove challenging. Wireless I/O networking dramatically reduces thermocouple wire and CAT5 cabling, enabling remote monitoring.
Our easy-to-connect network converters connect RS485 devices or analog signals to DeviceNet communication PLCs.
A power plant in the Northeast was under pressure to meet State EPA requirements of reporting fuel consumption (used for emissions monitoring). The issue was digging a costly trench from the pump house to the control room building in order to run fiber optic cable that delivers a flow meter signal to the plant's historian where reports could be generated. The cost would be $20,000.00 alone to dig the trench.
Plant consists of numerous outfall meter locations. These remote locations need to be monitored and the flow signals brought into the DCS system. There is AC power available at each site but currently no way to bring back analog signals along the existing infrastructure. Each location will have a Yokogawa AXF Magnetic Flow meter installed. The (4) sites current listed below will need to be connected to the Suwanee River Chemical Plant. There will be more sites added in the future.
The site consists of (10) remote wells with one central location that will collect all the data and have it available via Modbus TCP into the plant's DCS. Each well site has (1) 4-20 madc input from a flow meter, along with (1) DO signal to start the pump and (1) DI to read back the pump status. There is AC power available at each site. A path study was done before based on the GPS coordinates given for each site.
Here's how Shell upgraded from a pneumatic instrumented plant to a fully digital control system.
Decades of operation, modernization and expansion have left many chemical plants with a somewhat haphazard automation mix of different controls, process control systems, remote I/Os and field devices. The various components may use different communication protocols such as HART, PROFIBUS or FOUNDATION Fieldbus, and are often based on different device integration technologies.
The changes in social environment, such as globalization of enterprise activities, depletion of natural resources, and eco-oriented movement will affect the structure of mass production. Control systems must be prepared with flexibility and scalability in both size and function to adjust to the changes.
To configure a compact, low-power medium attachment unit for field buses, i.e., a fieldbus MAU, an IC comprising a power generator, transmitter/receiver and other functions is needed. While we at Yokogawa had already developed a fieldbus MAU IC, we have now developed another MAU IC that includes large-scale design changes made mainly to comply with the low-power signaling requirements of the fieldbus specifications.
Progress in digital signal processing and network technologies has enabled advanced functions which cannot be achieved by traditional field devices with 4-20 mA signal, to be implemented on field devices. Standardization of international fieldbus specifications, notably the FOUNDATION™ Fieldbus, has enabled users to build optimum field networks comprised of freely chosen field devices from various device vendors.
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