Method and apparatus for providing a standard interface to process control devices that are adapted to differing field-bus protocols

• US 5,923,557 A
• Filed: 08/01/1997
• Issued: 07/13/1999
• Est. Priority Date: 08/01/1997
• Status: Expired due to Fees

• Current Assignee: Agilent Technologies, Inc.
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Eidson, John C.
• Primary Examiner(s): Grant, William
• Assistant Examiner(s): Rapp, Chad
• Application Number:
  US08/904,364
• Time in Patent Office: 711 Days
• Field of Search: 364/130, 364/131, 364/132, 364/133, 364/134, 364/138, 364/188, 364/189, 364/471.03, 395/200.6-200.67, 395/831, 395/885, 395/892, 395/200.54, 395/200.8, 370/466, 370/469, 710/72
• US Class Current: 700/129
• CPC Class Codes: G05B 19/4147 characterised by using a programmable interface controller [PIC]
• CPC Class Codes: G05B 2219/31121 Fielddevice, field controller, interface connected to fieldbus
• CPC Class Codes: G05B 2219/31129 Universal interface for different fieldbus protocols
• CPC Class Codes: G05B 2219/31135 Fieldbus
• CPC Class Codes: G05B 2219/31138 Profibus process fieldbus
• CPC Class Codes: G05B 2219/33177 Interface, scsi, parallel
• CPC Class Codes: H04L 12/40006 Architecture of a communication node current supply arrangements H04L12/10; intermediate storage or scheduling H04L49/90
• CPC Class Codes: H04L 2012/4026 Bus for use in automation systems
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: Y02P 90/02 Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

A method and apparatus is disclosed that provides a standard interface to process control devices which are adapted to differing field-bus protocols. The techniques disclosed herein enable integration of process control devices adapted to differing field-bus protocols while avoiding the use of protocol gateways which would otherwise greatly complicate the task of developing process control application programs.

Claims

1. An apparatus for providing a standard interface to a process control device which is adapted to a predetermined field-bus protocol of a field-bus, comprising:

means for obtaining a set of information pertaining to the process control device wherein the information describes the process control device according to a predetermined device-oriented protocol that corresponds to the standard interface;

means for enabling a process control application to access the information using the predetermined device-oriented protocol;

means for generating a set of interface-related information that specifies at least one channel of the standard interface to be used for communication with the process control device according to a predetermined device-oriented protocol;

means for enabling the process control application to access the interface-related information using the predetermined device-oriented protocol.

2. The apparatus of claim 1, wherein the channel is used by the process control application to read data from the process control device.

3. The apparatus of claim 1, wherein the channel is used by the process control application to write data to the process control device.

4. The apparatus of claim 1, wherein the interface-related information further specifies a set of dictionary channels to be used for obtaining information pertaining to the process control device from an external dictionary server.

5. A process control system, comprising:

a set of process control devices coupled to a field-bus, wherein each process control device is adapted to a predetermined protocol of the field-bus;

mapper that enables an application controller to access the process control devices as if the process control devices conformed to a standard interface having a predetermined device-oriented protocol wherein the mapper comprises

field-bus interface that enables access to the process control devices via the field-bus using the predetermined protocol of the field-bus;

device-oriented interface that enables communication with the application controller using the predetermined device-oriented protocol;

database for holding a set of information pertaining to the process control devices which describes the process control devices in terms of the predetermined device-oriented protocol;

mapping processor that builds the information in the database and that enables access to the information by the application controller via the device-oriented interface.

6. The process control system of claim 5, wherein the mapper further comprises a device dictionary that contains multiples sets of information pertaining to differing types of process control devices from which the mapping processor builds the database.

7. The process control system of claim 5, further comprising a dictionary server coupled to the field-bus wherein the dictionary server contains multiples sets of information pertaining to differing types of process control devices from which the mapping processor builds the database.

8. The process control system of claim 5, further comprising a dictionary server coupled to an external network wherein the dictionary server contains multiples sets of information pertaining to differing types of process control devices from which the mapping processor builds the database.

9. The process control system of claim 5, wherein the mapper further generates a set of interface-related information that specifies at least one channel of the standard interface to be used for communication with each process control device according to a predetermined device-oriented protocol and enables the application controller to access the interface-related information using the predetermined device-oriented protocol.

10. The process control system of claim 9, wherein one of the channels is used by the application controller to read data from the corresponding process control device.

11. The process control system of claim 9, wherein one of the channels is used by the application controller to write data to the corresponding process control device.

12. The process control system of claim 9, wherein one of the channels is used by the application controller to write peer-to-peer configuration data to the corresponding process control device.

13. The process control system of claim 9, wherein the interface-related information further specifies a set of dictionary channels to be used by the application controller and the mapper to communicate information pertaining to the process control device obtain from an external dictionary server.