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Two-wire bus instrument

  • US 20070038390A1
  • Filed: 09/30/2003
  • Published: 02/15/2007
  • Est. Priority Date: 09/30/2003
  • Status: Active Grant
First Claim
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1. A two-wire bus instrument (500) adapted for use with a two-wire bus (308), comprising an instrument element (304) that receives a third current and that generates one or more sensor measurement signals, a signal processor (512) that receives a second current and that processes the one or more sensor measurement signals from the instrument element (304) to produce a data signal, and a communication system (511) that receives a first current and that receives the data signal from the signal processor (512), generates a digital communication signal including the data signal, and modulates the digital communication signal onto the two-wire bus (308);

  • wherein the two-wire bus instrument (500) is further characterized by;

    a communication power supply (501) connected to the communication system (511) and wherein the communication power supply (501) and the communication system (511) are capable of being connected across the two-wire bus (308), with the communication power supply (501) being configured to provide the first current, a substantially constant voltage, and a first power to the communication system (511);

    a signal processing power supply (502) connected to the signal processor (512) and wherein the signal processor (512) and the signal processing power supply (502) are capable of being connected across the two-wire bus (308) and in parallel with the communication power supply (501) and the communication system (511), with the signal processing power supply (502) being configured to provide the second current, a substantially constant voltage, and a second power to the signal processor (512);

    a drive current power supply (503) connected to the instrument element (304) and wherein the instrument element (304) and the drive current power supply (503) are capable of being connected across the two-wire bus (308) and in parallel with the communication power supply (501) and the communication system (511) and further in parallel with the signal processing power supply (502) and the signal processor (512), with the drive current power supply (503) being configured to provide the third current, a substantially constant voltage, and a third power to the instrument element (304).

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