Transmitter with dual protocol interface

• US 20040199681A1
• Filed: 04/04/2003
• Published: 10/07/2004
• Est. Priority Date: 04/04/2003
• Status: Active Grant

• Current Assignee: Rosemount Incorporated (Emerson Electric Company)
• Original Assignee: Rosemount Incorporated (Emerson Electric Company)
• Inventors: Hedtke, Robert C.
• Granted Patent: US 6,904,476 B2
• Time in Patent Office: Days
• US Class Current: 710/37
• CPC Class Codes: G05B 19/4185 characterised by the network communication
• CPC Class Codes: G05B 2219/25012 Two different bus systems
• CPC Class Codes: G05B 2219/31126 Transmitter coupled to fieldbus and to sensor, a-d conversion
• CPC Class Codes: Y02P 90/02 Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

A two-wire process transmitter for use in monitoring an industrial process includes HART communication circuitry and Fieldbus communication circuitry to couple to a two-wire process control loop. A first pair of electrical terminals is provided to couple the HART communication circuitry to the two-wire process control loop in a first configuration, and a second pair of electrical terminals is provided to couple the Fieldbus communication circuitry to the two-wire process control loop in an alternative second configuration.

Claims

1. A two-wire process transmitter for use in monitoring an industrial process, comprising:

HART communication circuitry configured to couple to a two-wire process control loop and operate in accordance with HART communication protocol and completely power the transmitter with power received from the two-wire process control loop;

Fieldbus communication circuitry configured to couple to the two-wire process control loop and operate in accordance with Fieldbus communication protocol and completely power the transmitter with power received from the two-wire process control loop;

a first pair of electrical terminals adapted to couple the HART communication circuitry to the two-wire process control loop in a first configuration; and

a second pair of electrical terminals adapted to couple the Fieldbus communication circuitry to the two-wire process control loop in an alternative second configuration.

2. The transmitter of claim 1 including a sensor coupled to HART and Fieldbus communication circuitry to sense a process variable.

3. The transmitter of claim 1 including a local device which is completely powered with power received from the process control loop.

4. The transmitter of claim 2 wherein the local device comprises a display.

5. The transmitter of claim 2 wherein the local device is coupled to the Fieldbus communication circuitry.

6. The transmitter of claim 1 including a sliding plate slidably positioned over the first pair of electrical terminals and the second pair of electrical terminals whereby only one pair of electrical terminals is accessible at a time.

7. The transmitter of claim 1 including a sensor electrical coupled to the HART communication circuitry.

8. The transmitter of claim 1 including a local bus which electrically couples the HART communication circuitry with the Fieldbus communication circuitry.

9. The transmitter of claim 1 wherein the Fieldbus communication circuitry provides power to the HART communication circuitry when the process control loop is coupled the second pair of terminals.

10. The transmitter of claim 1 wherein the HART communication circuitry provides power to the Fieldbus communication circuitry when the process control loop is coupled to the first pair of electrical terminals.

11. A two-wire process transmitter for use in monitoring an industrial process, comprising:

HART communication means for coupling to a two-wire process control loop, operating in accordance with HART communication protocol and completely powering the transmitter with power received from the two-wire process control loop;

Fieldbus communication means for coupling to the two-wire process control loop, operating in accordance with Fieldbus communication protocol and completely powering the transmitter with power received from the two-wire process control loop;

a first electrical terminal means for coupling the HART communication circuitry to the two-wire process control loop in a first configuration; and

second pair of electrical terminal means for coupling the Fieldbus communication circuitry to the two-wire process control loop in an alternative second configuration.

12. A method of coupling a two-wire process transmitter to a two-wire process control loop, comprising:

providing HART communication circuitry configured to couple to a two-wire process control loop and operate in accordance with HART communication protocol and completely power the transmitter with power received from the two-wire process control loop;

providing Fieldbus communication circuitry configured to couple to the two-wire process control loop and operate in accordance with Fieldbus communication protocol and completely power the transmitter with power received from the two-wire process control loop;

providing a first pair of electrical terminals adapted to couple the HART communication circuitry to the two-wire process control loop in a first configuration; and

providing a second pair of electrical terminals adapted to couple the Fieldbus communication circuitry to the two-wire process control loop in an alternative second configuration.

13. The method of claim 12 including coupling the first pair of electrical terminals to a two-wire process control loop operating in accordance with HART communication protocol.

14. The method of claim 12 including coupling the second pair of electrical terminals to a two-wire process control loop operating in accordance with HART communication protocol.

15. The method of claim 12 including powering a local device with power received from the process control loop.

16. The method of claim 15 wherein the local device comprises a display.

17. The method of claim 16 wherein the local device is coupled to the Fieldbus communication circuitry.

18. The method of claim 12 including sliding a plate which is slidably positioned over the first pair of electrical terminals and the second pair of electrical terminals whereby only one pair of electrical terminals is accessible at a time.

19. The method of claim 12 including coupling the HART communication circuitry to the Fieldbus communication circuitry through a local bus.

20. The method of claim 12 including powering the HART communication circuitry from the Fieldbus communication circuitry when the process control loop is coupled the second pair of terminals.

21. The method of claim 12 including powering the Fieldbus communication circuitry with the HART communication circuitry when the process control loop is coupled to the first pair of electrical terminals.

22. A two-wire process transmitter for use in monitoring an industrial process, comprising:

providing HART communication circuitry configured to couple to a two-wire process control loop and operate in accordance with HART communication protocol and completely power the transmitter with power received from the two-wire process control loop;

providing Profibus communication circuitry configured to couple to the two-wire process control loop and operate in accordance with Profibus communication protocol and completely power the transmitter with power received from the two-wire process control loop;

providing a first pair of electrical terminals adapted to couple the HART communication circuitry to the two-wire process control loop in a first configuration; and

providing a second pair of electrical terminals adapted to couple the Profibus communication circuitry to the two-wire process control loop in an alternative second configuration.

23. A method of coupling a two-wire process transmitter to a two-wire process control loop, comprising:

providing HART communication circuitry configured to couple to a two-wire process control loop and operate in accordance with HART communication protocol and completely power the transmitter with power received from the two-wire process control loop;

providing Profibus communication circuitry configured to couple to the two-wire process control loop and operate in accordance with Profibus communication protocol and completely power the transmitter with power received from the two-wire process control loop;

providing a first pair of electrical terminals adapted to couple the HART communication circuitry to the two-wire process control loop in a first configuration; and

providing a second pair of electrical terminals adapted to couple the Profibus communication circuitry to the two-wire process control loop in an alternative second configuration.