US20070161371A1 - Visual mapping of field device message routes in a wireless mesh network - Google Patents

Visual mapping of field device message routes in a wireless mesh network Download PDF

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Publication number
US20070161371A1
US20070161371A1 US11/652,398 US65239807A US2007161371A1 US 20070161371 A1 US20070161371 A1 US 20070161371A1 US 65239807 A US65239807 A US 65239807A US 2007161371 A1 US2007161371 A1 US 2007161371A1
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nodes
network
visual
wireless mesh
performance data
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US11/652,398
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Patrick Dobrowski
Eric Lovegren
Kelly Orth
Kyle Stotz
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Fisher Rosemount Systems Inc
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Fisher Rosemount Systems Inc
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Application filed by Fisher Rosemount Systems Inc filed Critical Fisher Rosemount Systems Inc
Priority to US11/652,398 priority Critical patent/US20070161371A1/en
Publication of US20070161371A1 publication Critical patent/US20070161371A1/en
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    • H04W40/04—Communication route or path selection, e.g. power-based or shortest path routing based on wireless node resources
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to wireless networks.
  • the invention relates to a wireless mesh network in which process control messages are communicated between a host and field devices at nodes of the wireless mesh network.
  • each field device includes a transducer, which may generate an output signal based on a physical input or generate a physical output based on an input signal.
  • transducers used in field devices include various analytical equipment, pressure sensors, thermistors, thermocouples, strain gauges, flow sensors, positioners, actuators, solenoids, indicators, and the like.
  • analog field devices have been connected to the process subsystem and the control room by two-wire twisted-pair current loops, with each device connected to the control room by a single two-wire twisted pair loop.
  • a voltage differential is maintained between the two wires of approximately 20 to 25 volts, and a current between 4 and 20 milliamps (mA) runs through the loop.
  • An analog field device transmits a signal to the control room by modulating the current running through the current loop to a current proportional to the sensed process variable.
  • An analog field device that performs an action under the control of the control room is controlled by the magnitude of the current through the loop, which is modulated by the ports of the process subsystem under the control of the controller.
  • FIG. 1 is a diagram illustrating a control system in which a wireless mesh network routes wireless messages between a host and field devices.
  • FIG. 2 is a flow chart of a method of providing a graphical visualization of message routing and network performance of a wireless mesh network.
  • FIGS. 3A and 3B are a visual network map of the wireless mesh network of FIG. 1 , formed using positional information and performance statistics obtained from nodes of the wireless network at different times.
  • FIGS. 4-6 show alternative visual network maps.
  • This invention provides a method for graphically visualizing the route a message takes as it passes between nodes in a wireless mesh network.
  • a host computer at a control center interacts with field devices located within a physical plant and displays information they have to offer.
  • the communication of messages between the host computer and the field devices can be over wired connections or over a wireless mesh network.
  • a device message does not pass from the host to the target field device directly; it can take a multitude of routes within the wireless mesh network before reaching its destination.
  • it is desirable to understand the routes messages take through the wireless mesh network so that the topology of the physical network can be adjusted if needed to enable the network to communicate in a more desirable way.
  • This invention is a graphical method to display the routes field device messages take as they travel through a wireless mesh network on their way to their destinations.
  • the user can be provided a visual representation of the wireless network (i.e. a visual network map) in which each node of the network is represented by an icon. Lines are drawn interconnecting the icons that represent the communication links between wireless nodes.
  • the graphical display can be dynamic in nature, in that the paths through the network will be updated in real time based upon network performance data collected from the nodes.
  • FIG. 1 shows control system 10 , which is an example of a system in which the visual mapping of signal routing in a wireless network can be used.
  • Control system 10 includes host computer 12 , highspeed network 14 , and wireless mesh network 16 , which includes gateway 18 and wireless nodes 20 , 22 , 24 , 26 , 28 , and 30 .
  • Gateway 18 interfaces mesh network 16 with host computer 12 over highspeed network 14 . Messages may be transmitted from host computer 12 to gateway 18 over network 14 , and are then transmitted to a selected node of mesh network 16 over one of several different paths. Similarly, messages from individual nodes of mesh network 16 are routed through mesh network 16 from node-to-node over one of several paths until they arrive at gateway 18 and are then transmitted to host 12 over highspeed network 14 .
  • Control system 10 can make use of field devices that have been designed for and used in wired distributed control systems, as well as field devices that are specially designed as wireless transmitters for use in wireless mesh networks.
  • Nodes 20 , 22 , 24 , 26 , 28 , and 30 show examples of wireless nodes that include conventional field devices.
  • Nodes 22 , 24 , 26 , and 28 are each examples showing nodes having one unique wireless address and one unique field device address.
  • Node 22 includes radio 36 , WDR 38 , and field device FD 3 .
  • field device 24 includes radio 40 , WDR 42 , and field device FD 4 ;
  • node 26 includes radio 44 , WDR 46 , and field device FD 5 , and
  • node 28 includes radio 48 , WDR 50 , and field device FD 6 .
  • Wireless network 16 is preferably a low power network in which many of the nodes are powered by long life batteries or low power energy scavenging power sources. Communication over wireless network 16 may be provided according to a mesh network configuration, in which messages are transmitted from node-to-node through network 16 . This allows the use of lower power RF radios, while allowing the network 16 to span a significant physical area to deliver messages from one end of the network to the other.
  • host computer 12 interacts with field devices FD 1 -FD 9 , and displays information contained in messages received from field devices FD 1 -FD 9 .
  • wireless mesh network 16 messages from host computer 12 to field devices FD 1 -FD 9 , and messages from field devices FD 1 -FD 9 back to host computer 12 can take multiple routes through network 16 before reaching a final destination.
  • FIG. 1 shows a simplified system, with only six wireless nodes 20 - 30 ; it is possible, however, for wireless mesh network 16 to have many more nodes, and therefore many more potential routes for messages to travel.
  • the position data is collected and stored in a database.
  • the position information must be updated in order for the positions of the nodes to be accurately portrayed in a visual network map.
  • the positional information allows a visual network map to accurately show the relative positions of the nodes of the wireless mesh network.
  • the positional information can be used to map the nodes of the network on to an image of the actual plant layout. This can be used to show relative location of the nodes to other physical objects in the plant, which may for example, interfere with communication between particular nodes.
  • network performance data is collected from each node.
  • the performance data includes an identification of the nodes with which the given node has established communication links.
  • the performance data may also include the number of transmissions occurring over each established link, how many errors have occurred over each link, and the signal strength of received signals over each link.
  • This performance data is reported in messages sent to gateway 18 and may be stored at gateway 18 , or sent on to host computer 12 . In either case, as performance data is collected from each node, the visual network map can be built up using that data. Once data has been collected from all nodes, a complete map can be displayed.
  • performance data is collected so that the visual network map can be updated dynamically.
  • the collection of performance data from the nodes can occur at regularly scheduled times, or can be performed on demand in response to a command sent to each of the nodes from gateway 18 .
  • the on-demand collection of data may be initiated by a user interacting with host computer 12 .
  • visual network map 50 may include capability of a user moving an arrow or cursor to select a particular link.
  • a display of performance data specific to that link can be provided.
  • selection of a particular node can result in a display of network performance information associated with that node.
  • other parameters relating to operation of the nodes can be displayed. For example, battery life at each node could be checked as part of a visual inspection of the network using the display.
  • FIGS. 4-6 show other display formats and different numbers of nodes.
  • visual network map 60 includes a large number of nodes N and links L are shown for a system much larger than control system 10 of FIGS. 1, 3A and 3 B. Multiple wireless networks are shown in map 60 .
  • FIG. 5 illustrates visual network map 70 , which includes nodes N and links L superimposed on plant layout P.
  • signal strength charts S are shown as part of map 80 .
  • a wide variety of display formats, using different network performance data, is available to provide the user with information needed to assess the performance of the wireless mesh network.
US11/652,398 2006-01-11 2007-01-11 Visual mapping of field device message routes in a wireless mesh network Abandoned US20070161371A1 (en)

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US11/652,398 US20070161371A1 (en) 2006-01-11 2007-01-11 Visual mapping of field device message routes in a wireless mesh network

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US11/652,398 Abandoned US20070161371A1 (en) 2006-01-11 2007-01-11 Visual mapping of field device message routes in a wireless mesh network
US11/652,399 Active 2028-07-21 US7903596B2 (en) 2006-01-11 2007-01-11 Control of low power wireless networks for power conservation
US11/652,400 Active 2028-10-25 US7783330B2 (en) 2006-01-11 2007-01-11 Control system with wireless address domain to field device address domain translation
US11/652,401 Active 2028-12-28 US7983211B2 (en) 2006-01-11 2007-01-11 Control system with wireless messages containing message sequence information
US11/652,395 Active 2028-12-15 US7986657B2 (en) 2006-01-11 2007-01-11 Selective activation of field devices in low power wireless mesh networks
US11/652,393 Active 2028-09-07 US7986968B2 (en) 2006-01-11 2007-01-11 Control of field device on low power wireless networks
US11/652,392 Active 2028-07-17 US7924774B2 (en) 2006-01-11 2007-01-11 Control system with predictive field device response time over a wireless network

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US11/652,399 Active 2028-07-21 US7903596B2 (en) 2006-01-11 2007-01-11 Control of low power wireless networks for power conservation
US11/652,400 Active 2028-10-25 US7783330B2 (en) 2006-01-11 2007-01-11 Control system with wireless address domain to field device address domain translation
US11/652,401 Active 2028-12-28 US7983211B2 (en) 2006-01-11 2007-01-11 Control system with wireless messages containing message sequence information
US11/652,395 Active 2028-12-15 US7986657B2 (en) 2006-01-11 2007-01-11 Selective activation of field devices in low power wireless mesh networks
US11/652,393 Active 2028-09-07 US7986968B2 (en) 2006-01-11 2007-01-11 Control of field device on low power wireless networks
US11/652,392 Active 2028-07-17 US7924774B2 (en) 2006-01-11 2007-01-11 Control system with predictive field device response time over a wireless network

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US (7) US20070161371A1 (zh)
EP (7) EP1980067B1 (zh)
JP (7) JP5522942B2 (zh)
CN (7) CN101401335B (zh)
CA (7) CA2675236C (zh)
RU (7) RU2444848C2 (zh)
WO (7) WO2007082020A2 (zh)

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US20100190442A1 (en) * 2009-01-29 2010-07-29 Citrano Iii Joseph Wireless field maintenance adapter
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US20140120947A1 (en) * 2012-10-26 2014-05-01 Telefonaktiebolaget L M Ericsson (Publ) Methods of Positioning in a System Comprising Measuring Nodes with Multiple Receiving Points
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US8766794B2 (en) 2010-07-28 2014-07-01 Fisher-Rosemount Systems, Inc. Handheld field maintenance tool with improved locational awareness functionality
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