Dynamic Assigning Of Bandwidth To Field Devices In A Process Control System

• US 20150023304A1
• Filed: 10/07/2014
• Published: 01/22/2015
• Est. Priority Date: 06/14/2011
• Status: Active Grant

• Current Assignee: Hitachi Energy Limited
• Original Assignee: ABB Research Ltd. (ABB Ltd.)
• Inventors: Akerberg, Johan, Landernas, Krister, Gidlund, Mikael
• Granted Patent: US 9,264,941 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 28/20 Negotiating bandwidth
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

A wireless network managing device for a wireless network that is part of a process control system. The wireless network managing device includes a node determination element configured to receive an operator selection of at least one node in the process control system via an operator terminal and determine a field device implementing the functionality of the node, and a bandwidth control element configured to adjust a bandwidth assigned to the at least one field device in an auxiliary data section of a communication structure used by the wireless network based on the received operator selection in order to increase system responsiveness.

Claims

1. A method for assigning bandwidth to wireless field devices in an auxiliary data section of a communication structure used by a wireless network, where the field devices are assigned a process control bandwidth in a process control data section of the communication structure, said wireless network being provided in a process control system, the method comprising the steps of:

receiving an operator selection of at least one node in the process control system via an operator terminal, the at least one node being at least one of a plurality of nodes presented to an operator via the operator terminal,

determining, via a node determination element of a networking managing device, a field device implementing the functionality of the node selected by the operator, and

adjusting the bandwidth assigned to said at least one field device in the auxiliary data section of the communication structure automatically based on the received operator selection by reassigning one or more existing time slots in the auxiliary data section of the communication structure to said at least one field device, where said process control bandwidth is unaffected by the operator selection.

2. The method according to claim 1, wherein the bandwidth is increased for the selected field device.

3. The method according to claim 1, wherein the operator selection is the selection of all field devices in a section of the process control system.

4. The method according to claim 1, wherein each of the wireless field devices is initially assigned an equal number of time slots in the auxiliary data section of the communication structure, and wherein the step of adjusting the bandwidth assigned to said at least one field device in the auxiliary data section includes increasing a number of time slots assigned to said at least one field device in the auxiliary data section and decreasing a corresponding number of time slots assigned to at least one other one of the wireless field devices in the auxiliary data section in order to retain the size of the auxiliary data section.

5. The method according to claim 1, wherein the selected field device is of a first type and the bandwidth of other field devices of the same type is also adjusted.

6. The method according to claim 1, wherein said adjustment is made in an uplink part of the communication structure.

7. The method according to claim 1, wherein said adjustment is made in a downlink part of the communication structure.

8. The method according to claim 1, wherein the communication structure is a superframe.

9. A wireless network managing device for a wireless network that is part of a process control system, the wireless network managing device comprising:

a node determination element configured to receive an operator selection of at least one node in the process control system via an operator terminal, the at least one node being at least one of a plurality of nodes presented to an operator via the operator terminal, and determine a field device implementing the functionality of the node selected by the operator, and

a bandwidth control element configured to adjust a bandwidth assigned to said at least one field device in an auxiliary data section of a communication structure used by said communication network automatically based on the received operator selection by reassigning one or more existing time slots in the auxiliary data section of the communication structure to said at least one field device, and

assign a process control bandwidth in a process control data section of the communication structure to the field devices, said process control bandwidth being unaffected by the operator selection.

10. The wireless network managing device according to claim 9, wherein the bandwidth control element is configured to increase the bandwidth for the selected field devices.

11. The wireless network managing device according to claim 9, wherein the operator selection is the selection of all field devices in a section of the process control system.

12. The wireless network managing device according to claim 9, wherein each of a plurality of field devices is initially assigned an equal number of time slots in the auxiliary data section of the communication structure, and wherein upon on receipt of the operator selection said bandwidth control element increases a number of time slots assigned to said at least one field device in the auxiliary data section and decreases a corresponding number of time slots assigned to at least one other one of the plurality of field devices in the auxiliary data section in order to retain the size of the auxiliary data section.

13. The wireless network managing device according to claim 9, wherein the selected field device is of a first type and the bandwidth control element is further configured to adjust the bandwidth of other field devices of the same type.

14. The wireless network managing device according to claim 9, wherein the bandwidth control element is configured to adjust the bandwidth in an uplink part of the communication structure.

15. The wireless network managing device according to claim 9, wherein the bandwidth control element is configured to adjust the bandwidth in a downlink part of the communication structure.

16. The wireless network managing device according to claim 9, wherein the communication structure is a superframe.

17. A computer program product for a wireless network managing device for a wireless network that is part of a process control system, the computer program product comprising a non-transitory data carrier with computer program code which when run on a processor forming the wireless network managing device, causes the wireless network managing device to:

receive an operator selection of at least one node in the process control system via an operator terminal, the at least one node being at least one of a plurality of nodes presented to an operator via the operator terminal,

determine, via a node determination element of a networking managing device, at least one field device implementing the functionality of the node selected by the operator, and

adjust a bandwidth assigned to said at least one field device in an auxiliary data section of a communication structure used by said wireless network automatically based on the received operator selection by reassigning one or more time slots in the auxiliary data section of the communication structure to said at least one field device, where the field devices are assigned a process control bandwidth in a process control data section of the communication structure, said process control bandwidth being unaffected by the operator selection.

18. The computer program product according to claim 17, wherein each of a plurality of field devices is initially assigned an equal number of time slots in the auxiliary data section of the communication structure, and wherein upon on receipt of the operator selection a number of time slots assigned to said at least one field device in the auxiliary data section is increased and a corresponding number of time slots assigned to at least one other one of the plurality of field devices in the auxiliary data section is decreased in order to retain the size of the auxiliary data section.

19. The computer product according to claim 17, wherein the communication structure is a superframe.