Computer-Implemented Method And System For Automatic Generation Of Time Slot Allocation For A Wireless Control Loop

• US 20120127971A1
• Filed: 11/18/2011
• Published: 05/24/2012
• Est. Priority Date: 05/19/2009
• Status: Active Grant

• Current Assignee: ABB Schweiz AG (ABB Limited)
• Original Assignee: ABB Research Ltd. (ABB Limited)
• Inventors: Isaksson, Alf
• Granted Patent: US 9,743,398 B2
• Time in Patent Office: Days
• US Class Current: 370/337
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling

Abstract

A computer implemented method for providing a time slot allocation in a wireless communication schedule for monitoring and control of a control loop in an industrial process, the industrial process having at least one control task and a plurality of wirelessly enabled field devices. The method includes importing dependency information between at least two field devices of at least one control loop, automatically converting the dependency information into a communication schedule and allocating time slots in the communication schedule to one or more field devices of the at least one control loop dependent at least on a dependency relationship between at least two field devices. A system and a computer program product are also disclosed.

Claims

1. A computer implemented method for providing a time slot allocation in a wireless communication schedule for monitoring and control of a control loop in an industrial process, said industrial process having at least one control task and a plurality of wirelessly enabled field devices characterized by importing dependency information between at least two said field devices of at least one said control loop from any of a CAD file, a P&

I diagram in electronic file form, a process logic diagram in electronic file form, a P&

I diagram in the form of an extended XML file, a process graphic, a controller configuration in a control system, and allocating time slots in said communication schedule to one or more said field devices of the at least one said control loop dependent at least on a dependency information between at least two said field devices.

2. The method according to claim 1, characterised by allocating time slots in a said wireless communication schedule arranged to one or more said field devices in two or more said control loops.

3. The method according to claim 1, characterised by allocating time slots in a said wireless communication schedule arranged as a superframe to one or more said field devices in at least one said control loop where the superframe comprises both a said wireless communication schedule and a control task execution schedule of a controller.

4. The method according to claim 1, characterised by allocating time slots in two or more said wireless communication schedules arranged as multiple superframes to one or more said field devices in two or more said control loops.

5. The method according to claim 1, characterised by sending from a wireless gateway in a wireless network a time stamp or clock signal to a controller of a said control loop and synchronizing the execution of a control cycles of the controller to the time slots of said wireless communication.

6. The method according to claim 1, characterised by allocating time slots in one or more TDMA schemas for a spread-spectrum wireless network operating as a mesh network and using frequency hopping to allocate channels.

7. The method according to claim 1, characterised by allocating time slots in one or more TDMA schemas for a wireless network compatible with WirelessHART.

8. The method according to claim 1, characterised by allocating time slots in one or more TDMA schemas for a wireless network compatible with an ISA 100 standard.

9. The method according to claim 1, characterised by converting the dependency information between said field devices of at least one said control loop into one or more dependency relationships.

10. The method according to claim 1, characterised by converting dependency information between said field devices of at least one said control loop, the dependency information being comprised in a process logic format, into one or more dependency relationships and allocating time slots in said communication schedule to one or more said field devices dependent at least on the dependency relationship between at least two said field devices.

11. The method according to claim 1, characterised by allocating time slots for field devices in the one or more control loops in one of a plurality of superframes, which allocation is dependent at least on the information of dependency between two or more field devices and/or two or more control loops.

12. The method according to claim 1, characterised by storing one or more TDMA schemas or superframes in a wireless gateway or wireless node configured securely connected to a Network Manager application or device.

13. The method according to claim 1, characterised by allocating at least one shared time slot for a field device in the one or more control loops in at least one of a plurality of superframes.

14. A wireless communication system for monitoring and control of a control loop of an industrial process, said industrial process having at least one control task and a plurality of wireless enabled field devices, said wireless communication system comprising a plurality of wireless nodes communicating according to a wireless communication schedule and forming part of a wireless network, characterised in that the wireless network is controlled by a wireless network manager dependent on time slots allocated in said communication schedule to one or more said field devices of at least one said control loop dependent at least on a dependency information between at least two said field devices, and a distributed control system having an application or function into which dependency information between at least two said field devices of at least one said control loop is arranged to be imported from any of a CAD file, a P&

I diagram in electronic file form, a process logic diagram in electronic file form, a P&

I diagram in the form of an extended XML file, a process graphic, a controller configuration in a control system.

15. The system according to claim 14, characterised in that the wireless network manager controls the wireless network dependent on time slots allocated in said wireless communication schedule to one or more said field devices of at least one said control loop dependent at least on a dependency information between at least two said field devices and two or more control loops.

16. The system according to claim 14, characterised in that the wireless network manager controls the wireless network dependent on time slots allocated in said wireless communication schedule to one or more said field devices of at least one said control loop dependent at least on a dependency information between two or more control loops.

17. The system according to claim 14, characterised in that said wireless communication schedule is arranged as a superframe to one or more said field devices in at least one said control loop where the superframe comprises both a said wireless communication schedule and a control task execution schedule of a controller.

18. The system according to claim 14, characterised in that at least one wireless gateway in the wireless network is arranged configurable for clock synchronization with a control task of the one or more said control loops.

19. The system according to claim 18, characterised in that the network manager is arranged connected to the at least one wireless gateway in the wireless network using a secure connection.

20. The system according to claim 14, characterised in that the network manager is arranged incorporated in a wireless gateway in the wireless network.

21. The system according to claim 14, characterised in that a handheld wireless configuration device is arranged to configure any of a network manager, gateway or wirelessly enabled field device.

22. The system according to claim 14, characterised by one or more field devices connected to said control loop of an industrial process by a hard-wired connection.

23. The system according to claim 14, characterised by a processing unit in a computer based system, the processing unit having an internal memory with a computer program product loaded therein, comprising software code portions for allocating time slots in said communication schedule to one or more said field devices of the at least one said control loop dependent at least on a dependency information between at least two said field devices stored on a memory storage device connected to the control system or DCS.

24. A computer program product on a data carrier comprising computer program code configured to perform a method for providing a time slot allocation in a wireless communication schedule for monitoring and control of a control loop in an industrial process, said industrial process having at least one control task and a plurality of wirelessly enabled field devices, characterized by importing dependency information between at least two said field devices of at least one said control loop from any of a CAD file a P&

I diagram in electronic file form, a process logic diagram in electronic file form, a P&

I diagram in the form of an extended XML file, a process graphic, a controller configuration in a control system, and allocating time slots in said communication schedule to one or more said field devices of the at least one said control loop dependent at least on a dependency information between at least two said field devices, when said program code is loaded into a computer or terminal connected to a process control system.