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Fieldbus message queuing method and apparatus

A field bus, message technology, used in comprehensive factory control, program control, instrumentation, etc.

Inactive Publication Date: 2004-03-17
ROSEMOUNT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the low-power processing device still relies entirely on power from the processing control loop, it is able to meet internal safety regulations

Method used

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  • Fieldbus message queuing method and apparatus
  • Fieldbus message queuing method and apparatus
  • Fieldbus message queuing method and apparatus

Examples

Experimental program
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Embodiment Construction

[0018] Although the invention will be described in connection with a preferred Fieldbus embodiment, it will be understood by those skilled in the art that changes may be made in form and detail of the invention as defined in the appended claims without departing from the spirit and scope of the invention. Change.

[0019] figure 1 is a fieldbus process control system 10 representing a process measurement / control environment. System 10 includes Fieldbus loop 12 , loop termination 14 , Fieldbus power supply 16 , and Fieldbus devices 18 , 20 , 22 , 24 , 26 , and 28 .

[0020] The system 10 is wired in a spur installation, but other wiring installations are possible. Fieldbus terminations 14 are terminated at opposite ends of the Fieldbus loop 12 . Each Fieldbus terminal 14 is molded as a capacitor in series with a resistor. Typically, a capacitor has a capacitance of 1 microfarad and a resistor has a resistance of 100 ohms. A Fieldbus power supply 16 is also connected to the...

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PUM

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Abstract

A method and apparatus are provided to allow at least portions of two fieldb us messages to be stored in a fieldbus device (30). The fieldbus device (30) includes a media access unit (32), a fieldbus communication controller (34), and a controller (36). The media access unit (32) is coupleable to a fieldbu s loop (12) to receive fieldbus signals and provide a digital bitstream relate d to the fieldbus signals. The fieldbus communication controller (36) assemble s data segments relating to at least portions of two fieldbus messages from th e bitstream and stores the segments in a receive FIFO memory (46). The controller (36) is adapted to read the segments from the receive FIFO (46) memory and act upon fieldbus messages.

Description

technical field [0001] The process industry uses a variety of devices to monitor and control industrial processes. Such devices include a process variable transmitter, a process actuator, a process alarm, and a process control module. Background of the invention [0002] Process variable transmitters are used to monitor process variables associated with industrial processes. Such variables include: pressure, temperature, flow, level, pH, turbidity, density, concentration, chemical composition and other parameters. Process actuators are used to control valves, pumps, heaters, agitators, solenoid coils, vents, and other similar devices. The processing alarm device is used for remote monitoring of a specific processing variable among the variables provided by the processing variable transmitter, and if the processing variable deviates from a standard value to an unacceptable degree, an alarm is issued. The process control module receives information related to the process fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B15/02G05B19/042G05B19/418
CPCG05B19/0423G05B19/4185Y02P90/02
Inventor 布鲁斯·B·戴维斯保尔·D·卡曼
Owner ROSEMOUNT INC
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