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Case Study: Yale Maxnet
Published in Viktor Boed, Ira Goldschmidt, Robert Hobbs, John J. McGowan, Roberto Meinrath, Frantisek Zezulka, of Facilities Automation Systems, 1999
In addition to flow transducers, pressure and temperature sensors are also connected to the flow computers. Individual flow computers scan the connected field points and provide energy calculations (chill water tonnage = flow × DT × .042). Measured, calculated and diagnostic data along with the meter set-up parameters are stored in the flow computer registers and are accessible over the network using the Modbus addressing.
Application of a master meter systemto assure crude oil and natural gas quality during transportation
Published in Petroleum Science and Technology, 2018
Jasmina Perisic, Marina Milovanovic, Ivana Petrovic, Ljiljana Radovanovic, Marko Ristic, James G. Speight, Velimir Perisic
Beside the master meter, the key component of master meter system is flow computer (FC) which is responsible for data acquisition, signal processing and all calculations related to proving. The flow computer covers a series of new features, to attend a higher range of the applications in lawful metrology such as both liquid and gas measurements, up to 4 independent metering system configurations, acquisition of different signal types (pulse signals, 4–20 mA signals, HART, Foundation Fieldbus signals, Modbus TCP/IP and Modbus RTU), pulse and proving module, implementation of API tables for determination of correction factors for density and volume, proving capabilities (compact prover, ball prover, tank prover and master meter), audit trail log (all data related to transactions, proving, alarms, and configuration changes are stored in a FC memory, and also transferred to data base on the laptop – this information is protected and cannot be changed), engineering unit selection for each variable, extended security (up to 30 users identified by username with 4 access levels and possibility of double password), different redundancy levels (power supply and CPU, communication network and pulse input module) supported, supervision through HSE OPC Server enabled.
Migration of industrial process control systems to service-oriented architectures
Published in International Journal of Computer Integrated Manufacturing, 2018
Oscar Carlsson, Jerker Delsing, Fredrik Arrigucci, Armando W Colombo, Thomas Bangemann, Philippe Nappey
One possible solution is to use a legacy flow computer with legacy communication capabilities, i.e. a modbus, which would enable the flow computer to perform the necessary high-frequency calculations and transfer the data to a modbus register that could be read by any WS-capable device. The data would subsequently be processed from pulses into a flow rate and encapsulated into a WS-Event or message depending on the requirements.