Wireless Protocol Adapter

• US 20080273486A1
• Filed: 04/10/2008
• Published: 11/06/2008
• Est. Priority Date: 04/13/2007
• Status: Abandoned Application

• Current Assignee: Hart Communication Foundation (FieldComm Group, Inc.)
• Original Assignee: Hart Communication Foundation (FieldComm Group, Inc.)
• Inventors: Nixon, Mark J., Rotvold, Eric D., Pramanik, Robin S., Lennvall, Tomas P., Pratt, Wallace A.
• Application Number:
  US12/101,000
• Publication Number:
  US 20080273486A1
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: G05B 2219/31131 Field device with gateway functions for communication with pc and other field devices
• CPC Class Codes: G05B 2219/31369 Translation, conversion of protocol between two layers, networks
• CPC Class Codes: G05B 2219/33192 Radio link, wireless
• CPC Class Codes: H04L 12/403 with centralised control, e.g. polling
• CPC Class Codes: H04L 67/52 specially adapted for the location of the user terminal
• CPC Class Codes: H04L 67/565 Conversion or adaptation of application format or content adding application control or application functional data H04L67/561
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04Q 2209/30 using a wired architecture
• CPC Class Codes: H04Q 2209/40 using a wireless architecture
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 84/22 with access to wired networks
• CPC Class Codes: Y02P 90/02 Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

A wireless protocol adapter for use in a process system includes a wireless interface that communicates with a multi-node wireless communication network using a wireless communication protocol, a wired interface that connects to a first field device over a wired link, and a processing unit that transfers process data between the wireless communication network and the first field device to enable operation of the first field device and of the wireless protocol adapter in the wireless communication network as distinct network nodes.

Claims

1. A wireless protocol adapter for use in a process system, comprising:

a wireless interface that communicates with a multi-node wireless communication network using a wireless communication protocol;

a wired interface that connects to a first field device over a wired link; and

a processing unit that transfers process data between the wireless communication network and the first field device to enable operation of the first field device and of the wireless protocol adapter in the wireless communication network as distinct network nodes.

2. The wireless protocol adapter of claim 1, wherein the wired interface supports 4-20 mA analog signaling;

and wherein the multi-node wireless communication network operates using a wireless extension of the HART®

communication protocol.

3. The wireless protocol adapter of claim 1, wherein the wired interface supports HART®

communication protocol; and

wherein the multi-node wireless communication network operates using a wireless extension of the HART®

communication protocol sharing at least an application layer with the HART®

communication protocol.

4. The wireless protocol adapter of claim 1, wherein the wired interface supports at least one of HART®

, PROFIBUS, FOUNDATION FIELDBUS, or DeviceNet standards.

5. The wireless protocol adapter of claim 1, wherein the wireless interface and the wired interface support respective protocols sharing at least an application layer;

and wherein the processing unit transfers process control data between the wireless communication network and the first field device by separating application layer data from at least a physical layer of a respective protocol.

6. The wireless protocol adapter of claim 1, further comprising:

a memory that stores an address of the wireless protocol adapter;

wherein the address adapter conforms to an addressing scheme of the wireless communication network; and

wherein the wired interface supports the addressing scheme of the wireless communication network.

7. The wireless protocol adapter of claim 6, further wherein the memory further stores an adapter device descriptor (DD) conforming to the Device Description Language (DDL) and an adapter manufacturer identity;

and wherein the first field device is associated with a DD confirming to DDL and distinct from the adapter DD.

8. The wireless protocol adapter of claim 1, wherein the wired interface further connects to a second field device over the wired link.

9. The wireless protocol adapter of claim 8, wherein the processing unit further includes a router for routing data between each of the first field device, the second field device, and the wireless communication network.

10. The wireless protocol adapter of claim 8, wherein the wired interface further connects to a portable unit;

and wherein the processing unit provides the portable unit with access to the wireless communication network for at least one of maintenance or diagnostics.

11. The wireless protocol adapter of claim 1, wherein the wired interface connects to the first field device without disturbing an operation of the original circuit in which the first field device is connected.

12. A method of providing a wireless capability to a first field device supporting a communication standard and operating in a process control loop, comprising:

communicating with the first field device via a wired interface in accordance with the communication standard while the process control loop is operational;

communicating with a wireless communication network via a wireless interface; and

transferring data between the wired interface and the wireless interface to enable the first field device to operate in the wireless communication network.

13. The method of claim 12, wherein communicating with the first field device includes addressing the first field device according to an addressing scheme associated with the communication standard, wherein the addressing scheme is consistent with an addressing scheme of the wireless communication network.

14. The method of claim 13, wherein the addressing scheme is associated with the HART®

communication protocol.

15. The method of claim 12, further comprising:

communicating with a second field device operating in the process control loop via the wired interface; and

supporting a multi-drop connection between the wireless communication network and each of the first field device and the second field device.

16. The method of claim 12, wherein communicating with the first field device via a wired interface includes using an analog signaling scheme;

wherein communicating with a wireless communication network includes supporting a digital communication protocol; and

wherein transferring data between the wired interface and the wireless interface includes performing an analog-to-digital conversion in a direction of the wireless interface and a digital-to-analog conversion in a direction of the wired interface.

17. A multi-element electrical circuit operating a process control environment, comprising:

a first field device that performs at least one of a process control function or a measurement function;

a control system that exchanges data related to the at least one of a process control function or a measurement function with the first field device;

an electrical connector communicatively coupling the first field device with the control system; and

a wireless protocol adapter coupled to the first field device to provide wireless communications between the first field device and a wireless communication network.

18. The multi-element electrical circuit of claim 17, wherein the control system is a PLC.

19. The multi-element electrical circuit of claim 17, wherein the control system is a DCS.

20. The multi-element electrical circuit of claim 17, wherein the electrical connector supports communications related to at most one process control function or a measurement function;

and wherein the wireless protocol adapter receives data from the first field device unrelated to the one of a process control function or a measurement function.

21. The multi-element electrical circuit of claim 17, further comprising a second field device;

and wherein wireless protocol adapter is coupled to the first field device and to the second field device to provide routing between each of the first field device and the second field device and the wireless communication network.

22. A method of extending a capability of a wired field device operating in a process control environment with a wireless protocol adapter, comprising:

connecting the wired field device to a wired interface of the wireless protocol adapter;

communicating between the wireless protocol adapter and the wired field device in accordance with a wired communication standard supported by the wired field device to perform an extension function associated with a wireless communication protocol, wherein the extension function is not associated with the wired communication standard; and

communicating between wireless protocol adapter and a wireless communication network via a wireless interface supporting the wireless communication protocol.

23. The method of claim 22, wherein communicating between wireless protocol adapter and a wireless communication network includes reporting a result of executing the extension function.

24. The method of claim 22, wherein the wireless communication protocol supports a command set of the HART®

communication protocol;

wherein the wired field device is a 4-20 mA device; and

wherein the wired communication standard is associated with analog signaling over a wire pair.

25. The method of claim 22, wherein the wireless communication protocol supports a first command set of the HART®

communication protocol;

wherein the wired field device is a wired HART®

device supporting a second command set associated with an older version of the HART®

communication protocol than the version corresponding to the first command set; and

wherein the extension function is associated with the first command set but not with the second command set.

26. The method of claim 22, wherein communicating between the wireless protocol adapter and the wired field device to perform an extension function includes obtaining information indicative of a condition of the wired field device to report one of an alarm or an event associated with the wireless communication protocol.

27. The method of claim 22, wherein communicating between the wireless protocol adapter and the wired field device to perform an extension function includes polling for device data to support burst mode communications associated with the wireless communication protocol.

28. The method of claim 22, wherein communicating between the wireless protocol adapter and the wired field device to perform an extension function includes:

receiving a request for a block mode transfer from the wireless communication network via the wireless interface;

retrieving device data according to the wired communication standard;

buffering the device data at the wireless protocol adapter; and

transferring the device data to the wireless communication network via the wireless network.

29. The method of claim 28, wherein the device data is a measurement procedure performed at the wired field device.