Patent Publication Number: US-2023138872-A1

Title: Apparatus, system, method, and computer-readable medium

Description:
BACKGROUND 
     1. Technical Field 
     The present invention relates to an apparatus, a system, a method, and a program. 
     2. Related Art 
     Patent Document 1 discloses that “a line of sight of a user is detected to control information communication with another communication device”. 
     Patent Document 1: Japanese Patent Application Publication No. 2016-177565 
     GENERAL DISCLOSURE 
     A first aspect of the present invention provides an apparatus. The apparatus may include a storage unit configured to store, in association with each of a plurality of devices existing in a plant, a storage address of measurement data which is related. The apparatus may include a detection unit configured to detect, among the plurality of devices, a target device that a user is looking at. The apparatus may include an acquisition unit configured to acquire, from the storage address associated with the target device, measurement data related to the target device. The apparatus may include a display unit configured to display a content acquired by the acquisition unit. 
     The storage unit may be configured to respectively store, in association with each of at least one device among the plurality of devices, storage addresses of a plurality of types of measurement data. 
     Measurement data related to at least some devices among the plurality of devices may be stored in an external storage device of the at least some devices. The storage unit may be configured to store an address, which is in the storage device, in association with each of the at least some devices. 
     Measurement data related to two or more devices among the at least some devices may be stored in a single external storage device of the two or more devices. The storage unit may be configured to store addresses, which are in the storage device and different from each other, in association with each of the two or more devices. 
     Measurement data related to at least some other devices, which are different from the at least some devices, among the plurality of devices may be stored in an internal storage device of each of the at least some other devices. The storage unit may be configured to store, in association with each of the at least some other devices, an address which is in the internal storage device of the each of the at least some other devices. 
     The acquisition unit may be configured to acquire measurement data from two or more storage devices via one wireless communication device provided outside the apparatus. 
     A plurality of pieces of the measurement data related to the plurality of devices may include measurement data obtained by a sensor that is provided in a device, or a sensor that is provided in an accessory of the device. 
     A plurality of pieces of the measurement data related to the plurality of devices may include measurement data obtained by a sensor as a device. 
     A plurality of pieces of the measurement data related to the plurality of devices may include measurement data obtained by a sensor which is provided in an accessory on an upstream side or a downstream side with respect to a pipe as a device. 
     In one or more devices among the plurality of devices, a value of at least one parameter may be able to be set. The storage unit may be further configured to store, in association with each of the one or more devices, a storage address of a value of a parameter of the each of the one or more devices. The acquisition unit may be further configured to acquire, from a storage address of a value of a parameter associated with the target device, the value of the parameter of the target device. 
     The storage unit may be further configured to store a storage address of a relationship diagram showing, for each device existing in the plant, a relationship between the device and another device. The acquisition unit may be further configured to acquire the relationship diagram from the storage address of the relationship diagram associated with the target device. 
     A second aspect of the present invention provides a system. The system may include the apparatus according to the first aspect. The system may include at least one storage device configured to store, in association with each of at least some devices among the plurality of devices, measurement data related to the each of the at least some devices. 
     A third aspect of the present invention provides a method. The method may include storing, in association with each of a plurality of devices existing in a plant, a storage address of measurement data which is related. The method may include detecting, among the plurality of devices, a target device that a user is looking at. The method may include acquiring, from the storage address associated with the target device, measurement data related to the target device. The method may include displaying a content acquired by the acquiring. 
     A fourth aspect of the present invention provides a program. The program may cause a computer to function as a storage unit configured to store, in association with each of a plurality of devices existing in a plant, a storage address of measurement data which is related. The program may cause the computer to function as a detection unit configured to detect, among the plurality of devices, a target device that a user is looking at. The program may cause the computer to function as an acquisition unit configured to acquire, from the storage address associated with the target device, measurement data related to the target device. The program may cause the computer to function as a display unit configured to display a content acquired by the acquisition unit. 
     The summary clause does not necessarily describe all necessary features of the embodiments of the present invention. The present invention may also be a sub-combination of the features described above. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    shows a maintenance and management system  1  according to the present embodiment. 
         FIG.  2    shows a watching terminal  13 . 
         FIG.  3    shows an appearance of the watching terminal  13 . 
         FIG.  4    shows an operation of the watching terminal  13 . 
         FIG.  5    shows an example of a computer  2200  in which a plurality of aspects of the present invention may be entirely or partially embodied. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereinafter, the invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to claims. In addition, not all of the combinations of features described in the embodiments are essential to the solving means of the invention. 
     1. Configuration of Maintenance and Management System  1   
       FIG.  1    shows a maintenance and management system  1  according to the present embodiment. The maintenance and management system  1  performs maintenance and management of a plant, and includes a plurality of devices  11 , a maintenance terminal  12 , a watching terminal  13 , one or more wireless communication devices  14 , and an operation control apparatus  15 , an interface apparatus  16 , a resource management apparatus  17 , one or more document databases  18 , and a maintenance and management apparatus  19 . 
     Here, examples of the plant include: in addition to an industrial plant such as a chemical plant, a plant for managing and controlling a well site such as a gas field or an oil field and its surrounding area; a plant for managing and controlling power generation such as hydroelectric, thermal, or nuclear power generation; a plant for managing and controlling energy harvesting from solar power, wind power, or the like; a plant for managing and controlling water and sewerage, dams, or the like; and others. Each device  11 , the maintenance terminal  12 , a watching terminal  13 , and the wireless communication device  14  may be arranged at a field site where a process is executed in the plant. For example, at the field site, there exist a pipe through which a fluid to be measured is caused to flow, a flow meter which is installed in the pipe to measure a flow rate of the fluid, and the like. In addition, the operation control apparatus  15 , the interface apparatus  16 , and the resource management apparatus  17  may be arranged in a management room, an instrument room, or the like in the plant. The document database  18  may be arranged outside the plant. The maintenance and management apparatus  19  may be arranged in the management room, the instrument room, or the like in the plant, or may be arranged outside the plant. 
     1-1. Device  11   
     Each of the plurality of devices  11  is a tool, a machine, or an apparatus, and for example, may be: a sensor that measures a physical quantity such as a pressure, a temperature, a pH, a speed, and a flow rate in the process in the plant; may be an actuator such as a valve which controls any of physical quantities, a flow control valve, an opening and closing valve, a pump, a fan, a motor, a heating apparatus, or a cooling apparatus; may be an acoustic device such as a microphone or a speaker that collects an abnormal noise or the like in the plant or emits a warning sound or the like; may be a location detection device that outputs location information of each device; may be a pipe through which a fluid is caused to flow; or may be another device. Each device  11  among the plurality of devices  11  may be a different type, or two or more of at least some devices  11  may be the same type. 
     Each device  11  may be connected to the operation control apparatus  15  via a control network  100  in a wired or wireless manner. A communication in the control network  100  may a be digital communication, may be a hybrid communication in which a digital signal is superimposed on an analog signal (a signal at 4 to 20 mA or the like), or may be at a speed of approximately 1000 bps to 10000 bps (as an example, 1200 bps, 2400 bps). The communication in the control network  100  may be performed, for example, by a wireless communication protocol of ISA (International Society of Automation), and may be performed, as an example, by ISA100, HART (Highway Addressable Remote Transducer) (registered trademark), BRAIN (registered trademark), FOUNDATION Fieldbus, PROFIBUS, or the like. 
     In addition, at least some devices  11  may wirelessly communicate with at least one of the wireless communication device  14  or the watching terminal  13  in accordance with a standard of IEEE802.11 (so-called Wifi (registered trademark)) or a standard of IEEE802.15.1 (so-called Bluetooth (registered trademark)). 
     Each device  11  may have specific identification information (also referred to as device specific information). The device specific information is information for uniquely identifying the device, and may be, as an example in the present embodiment, at least one of a serial number assigned to the device  11  by a communication protocol (the HART as an example), a serial number set by a manufacturer of the device  11 , or a device ID. 
     In addition, in the one or more devices  11 , a value of at least one parameter (also referred to as a value of a configuration parameter) may be able to be set. The configuration parameter may be any parameter. As an example, the configuration parameter may be an adjustment amount for performing a zero point adjustment, may indicate a time constant, may indicate whether an initialization is necessary or unnecessary, may indicate a test condition, or may indicate the identification information or a tag name of the device  11 . The value of the configuration parameter may be stored in an internal storage device (not shown) of the device  11 . 
     In addition, at least some devices  11  may each store measurement data related to the at least some devices  11  in the internal storage device. 
     1-1.1. Measurement Data 
     Measurement Data (1) 
     A plurality of pieces of measurement data related to the plurality of devices  11  may include the measurement data obtained by the sensor as the device  11 . 
     For example, when the device  11  is the sensor that measures the physical quantity such as a pressure, a temperature, a pH, a speed, and a flow rate, the measurement data may be data indicating these physical quantities. 
     Measurement Data (2) 
     The plurality of pieces of measurement data related to the plurality of devices  11  may include the measurement data obtained by the sensor that is provided in the device  11 , or the sensor that is provided in an accessory of the device  11 . 
     For example, when the device  11  is the actuator, and sensors are provided in the device  11  itself or the accessory of the device  11 , the measurement data may be data measured by these sensors. As an example, when the device  11  is the actuator of a valve, a flow control valve, an opening and closing valve, a pump, a fan, a motor, or the like, the measurement data may be data indicating the physical quantity such as a speed, a flow rate, a pressure, a temperature, and a pH of a fluid which are controlled by the device  11 . When the device  11  is the actuator of a heating apparatus, a cooling apparatus, or the like, the measurement data may be data indicating the physical quantity such as a temperature of a target which is heated or cooled by the device  11 . 
     In addition, when the device  11  is the pipe, and sensors are provided in the device  11  itself or the accessory of the device  11 , the measurement data may be data measured by these sensors. As an example, the measurement data may be data indicating the physical quantity such as a speed, a flow rate, a pressure, a temperature, and a pH of the fluid flowing through the pipe as the device  11 . 
     It should be noted that as the sensor provided in the device  11 , or the sensor provided in the accessory of the device  11 , the sensor itself may be the device  11 . In this case, the measurement data obtained by the sensor is measurement data related to the device  11  as the sensor, or may be measurement data related to the device  11  provided with the sensor (or the device  11  provided with the sensor in the accessory). 
     In addition, the accessory of the device  11  may be an article with a body different from a main body of the device  11 . For example, the accessory of the device  11  may be a pipe provided with the device  11 , a wall into which the device  11  is fitted, a cover of the device  11 , or the like. 
     Measurement Data (3) 
     The plurality of pieces of measurement data related to the plurality of devices  11  may include the measurement data obtained by the sensor which is provided in an accessory on an upstream side or a downstream side with respect to the pipe as the device  11 . The accessory on the upstream side or the downstream side with respect to the pipe may be the pipe on the upstream side or the downstream side from the pipe, or may be the actuator of a flow control valve, an opening and closing valve, a pump, a fan, a motor, or the like, which is provided on the upstream side or the downstream side from the pipe. As an example, the measurement data may be data indicating the physical quantity such as a speed, a flow rate, a pressure, a temperature, and a pH of the fluid on the upstream side or the downstream side from the pipe as the device  11 . 
     1-2. Maintenance Terminal  12   
     The maintenance terminal  12  accesses the configuration parameter of device  11  to refer to, set, and change the value of the configuration parameter, or the like. The maintenance terminal  12  may be a handheld terminal (HHT) (as an example, a smartphone or a tablet PC) carried by a field site worker, or may be a stationary PC. When the maintenance terminal  12  is a handheld terminal, the maintenance terminal  12  may be detachably connected to the device  11 . It should be noted that in addition to the configuration parameter being changed by using the maintenance terminal  12 , the device  11  may be attached to and detached from the control network  100  by a field site worker, and an operation may also be stopped for maintenance. 
     1-3. Watching Terminal  13   
     The watching terminal  13  is an example of the apparatus, and is carried by a user (a watcher as an example) who watches an inside of the plant. 
     The watching terminal  13  may wirelessly communicate with the one or more devices  11 . In addition to or instead of this, the watching terminal  13  may wirelessly communicate, via the wireless communication device  14 , with at least one of the one or more devices  11 , the operation control apparatus  15 , the interface apparatus  16 , or the resource management apparatus  17 . The wireless communication by the watching terminal  13  may be in accordance with at least one standard of the Wifi (registered trademark) or the Bluetooth (registered trademark). 
     The watching terminal  13  may display information related to the device  11 . It should be noted that the details of the watching terminal  13  will be described below. 
     1-4. Wireless Communication Device  14   
     Each wireless communication device  14  is provided outside the watching terminal  13  to wirelessly communicate with the watching terminal  13 . Each wireless communication device  14  may communicate, in a wired or wireless manner, with at least one of the one or more devices  11 , the operation control apparatus  15 , the interface apparatus  16 , or the resource management apparatus  17 . For example, the wireless communication device  14  may communicate, via a network  101 , with the operation control apparatus  15 , the interface apparatus  16 , or the resource management apparatus  17 . 
     1-5. Operation Control Apparatus  15   
     The operation control apparatus  15  communicates with each device  11  to control the process. For example, the operation control apparatus  15  acquires a process value, which is measurement data, from the device  11  which is the sensor, and drives the device  11  which is the actuator. The operation control apparatus  15  may be an example of the storage device, and may store, in association with at least some devices  11 , the measurement data related to the at least some devices  11 . Then, the operation control apparatus  15  may supply the process value to the interface apparatus  16 , and receive a target value of the process value from the interface apparatus  16 . It should be noted that as an example, in the present embodiment, a description is made that the maintenance and management system  1  is provided with one operation control apparatus  15  to control all of the devices  11 ; however, a plurality of operation control apparatuses  15  may be provided to respectively perform distributed controls on some of the devices  11 . The operation control apparatus  15  may be an FCS (Field Control Station) as an example. 
     1-6. Interface Apparatus  16   
     The interface apparatus  16  interfaces between a manager and the plant. The interface apparatus  16  may control the process of the plant via the operation control apparatus  15  according to the operation by the manager. For example, the interface apparatus  16  may receive the process value from the operation control apparatus  15 , and supply the target value of the process value to the operation control apparatus  15 . In addition, the interface apparatus  16  may change the value of the configuration parameter of the device  11  via the operation control apparatus  15 . The interface apparatus  16  may be an example of the storage device, and may store, in association with at least some devices  11 , the measurement data related to the at least some devices  11 . In addition, the interface apparatus  16  may store, in association with at least some devices  11 , the value of the configuration parameter of each of the at least some devices  11 . The interface apparatus  16  may be a HIS (Human Interface Station) as an example, or may be constituted by a PC or the like. 
     1-7. Resource Management Apparatus  17   
     The resource management apparatus  17  performs online monitoring and centralized management of the plant. For example, the resource management apparatus  17  may manage information or the like (as an example, the value of the configuration parameter or the process value) of the device  11 , which is acquired by the operation control apparatus  15 . The resource management apparatus  17  may be an example of the storage device, and may store, in association with at least some devices  11 , the measurement data related to the at least some devices  11 . In addition, the resource management apparatus  17  may store, in association with at least some devices  11 , the value of the configuration parameter of each of the at least some devices  11 . The resource management apparatus  17  may be, as an example, constituted by a PC or the like. 
     1-8. Document Database  18   
     Each document database  18  stores a model name of the device  11  and a digitized document related to the device  11  in association with each other. The document may be a text file of a specification sheet, a manual, an inspection report, or the like of the device  11 , or may be an image file. The document database  18  may be installed by the manufacturer of the device  11  as an example. It should be noted that the document database  18  and the maintenance and management apparatus  19  may be connected to the resource management apparatus  17  or the like via the network  101  (as an example, the Internet or a dedicated line). 
     1-9. Maintenance and Management Apparatus  19   
     The maintenance and management apparatus  19  supports maintenance and management of equipment. The maintenance and management apparatus  19  may have a device ledger  1900  that stores at least the device specific information and the value of the configuration parameter for each of the plurality of devices  11 . The device ledger  1900  may include a relationship diagram showing, for each device  11  existing in the plant, a relationship between the device  11  and another device  11 . 
     The relationship diagram may be a piping diagram, or may be a design diagram of the plant. Note that the relationship diagram may be any other diagram. 
     As an example, the maintenance and management apparatus  19  may be a Device Lifecycle Manager, may be realized by cloud computing, or may be realized by a physical server or a PC. The maintenance and management apparatus  19  may be connected to the resource management apparatus  17  or the like via the network  101  in a wired or wireless manner. 
     2. Watching Terminal  13   
       FIG.  2    shows a watching terminal  13 . The watching terminal  13  has a storage unit  130 , a detection unit  131 , an acquisition unit  132 , and a display unit  133 . 
     2.1. Storage Unit  130   
     The storage unit  130  is configured to store, in association with each of the plurality of devices  11  existing in the plant, a storage address of the measurement data which is related or the like. In the present embodiment, as an example, the storage unit  130  may store the storage address in association with the device specific information of the device  11 . 
     The storage unit  130  may respectively store, in association with each of the at least one device  11  among the plurality of devices  11  existing in the plant, storage addresses of a plurality of types of measurement data. For example, when a plurality of sensors are provided in at least one of the device  11  or the accessory thereof, the storage unit  130  may store, in association with the device  11 , each of the storage addresses of the measurement data obtained by the plurality of sensors. The plurality of types of measurement data may be measurement data obtained by the sensors different from each other, may be data indicating types of physical quantities different from each other among the physical quantities such as a speed, a flow rate, a pressure, a temperature, and a pH, or may be data indicating the same type of physical quantities at measurement locations different from each other. 
     Here, the measurement data related to at least some devices  11  among the plurality of devices  11  existing in the plant may be stored in an external storage device of the at least some devices  11  (in the present embodiment, as an example, the operation control apparatus  15 , the interface apparatus  16 , or the resource management apparatus  17 ). In this case, the storage unit  130  may store, in association with each of these at least some devices  11 , an address which is in the external storage device of the device  11 , as the storage address of the measurement data. In addition, when the measurement data is stored in the external storage device of the device  11 , the measurement data related to the two or more devices  11  may be stored in a single external storage device of the device  11 . In this case, the storage unit  130  may respectively store, in association with each of the two or more devices  11 , addresses which are in the storage device and different from each other, as the storage addresses of the measurement data. 
     In addition, the measurement data related to at least some other devices  11  among the plurality of devices  11  existing in the plant may be stored in the internal storage device of each of the at least some other devices  11 . In this case, the storage unit  130  may store, in association with each of these at least some other devices  11 , the address which is in the internal storage device of each of the at least some other devices  11 , as the storage address of the measurement data. The device  11  in which the measurement data is stored in the internal storage device may be the device  11  different from the above-mentioned device  11  in which the measurement data is stored in the external storage device. 
     It should be noted that when the plurality of types of measurement data are stored for the device  11 , each of these plurality of types of measurement data may be stored in the internal storage device of the device  11 , or may be stored in the external storage device of the device  11 . Instead of this, among the plurality of types of measurement data, some types of measurement data may be stored in the internal storage device of the device  11 , and remaining types of measurement data may be stored in the external storage device of the device  11 . In this case, the storage unit  130  may store, in association with the device  11 , each of the address which is in the internal storage device of the device  11 , and the address which is in the external storage device of the device  11 , as the storage addresses of the measurement data. 
     2.1.1. Storage Other than Measurement Data 
     The storage unit  130  may further store, in association with each of the one or more devices  11  in which the value of the configuration parameter is able to be set, the storage address of the value of the configuration parameter of each of the one or more devices  11 . The storage address of the configuration parameter may be the same as or different from the storage address of the measurement data. 
     The storage unit  130  may store, as the storage address of the configuration parameter, the address which is in the internal storage device of the device  11 , or may store, as the storage address of the configuration parameter, the address which is in the external storage device of the device  11 . The external storage device of the device  11  may be the maintenance and management apparatus  19 , may be the maintenance terminal  12 , or may be the resource management apparatus  17 . When the operation control apparatus  15  or the interface apparatus  16  stores the value of the configuration parameter, the external storage device of the device  11  may be these apparatuses. 
     The storage unit  130  may further store the storage address of the relationship diagram (for example, the piping diagram or the design diagram) showing, for each device  11  existing in the plant, the relationship between the device  11  and the other device  11 . In the present embodiment, as an example, the storage unit  130  may store, as the storage address of the relationship diagram, the address which is in the maintenance and management apparatus  19 . 
     2.2. Detection Unit  131   
     The detection unit  131  is configured to detect, among the plurality of devices  11 , the target device  11  that the user is looking at. 
     The detection unit  131  may have one or more sensors  1310 . For example, the detection unit  131  may have at least one of a six axis sensor, a magnetic sensor, or a positioning sensor as the one or more sensors  1310 . 
     The six axis sensor may be a motion sensor (also referred to as an inertial sensor) having a three axis acceleration sensor and a three axis gyro (angular velocity) sensor, and may detect a movement of a head of the user, and further an orientation of the watching terminal  13 . The magnetic sensor may be, for example, a three axis geomagnetic sensor. The positioning sensor may receive a wireless signal which is transmitted from a GPS satellite, and detect coordinates of a current location of the watching terminal  13 . 
     The detection unit  131  may detect a location of the user in the plant, and a line of sight or a point of gaze (also referred to as a position of gaze) of both eyes based on signals from these sensors. The line of sight of the user may be a straight line connecting a midpoint of both eyes, and the point of gaze of the user. 
     The detection unit  131  may detect the target device  11  by referring to a database (not shown) in which the location coordinates of each device  11  in the plant are registered in advance. For example, the detection unit  131  may refer to the database and detect, as the target device  11 , the device  11  located on the line of sight starting from the location of the user, or may detect, as the target device  11 , the device  11  located at the point of gaze of both eyes of the user. The detection unit  131  may supply the device specific information of the detected target device  11  to the acquisition unit  132 . 
     It should be noted that the database may be provided in the watching terminal  13 , or may be externally connected to the watching terminal  13 . In addition, the detection unit  131  may further have a distance measuring sensor that measures a distance from the watching terminal  13  to an object in front (the device  11  as an example). In this case, the detection unit  131  may further use a signal from the distance measuring sensor to detect the point of gaze of the user. 
     In addition, the detection unit  131  may have a camera for capturing an image of an eyeball of the user. In this case, the detection unit  131  may specify a distance from the watching terminal  13  to the point of gaze of the user by using a convergence angle which is calculated from orientations of left and right eyeballs. When the detection unit  131  is provided with the camera for capturing the image of the eyeball, the detection unit  131  may detect the line of sight by analyzing the image of the eyeball without using the six axis sensor. 
     2.3. Acquisition Unit  132   
     The acquisition unit  132  is configured to acquire, from the storage address associated with the target device  11 , the measurement data related to the target device  11 . The acquisition unit  132  may further acquire, from the storage address associated with the target device  11 , the value of the configuration parameter of the target device  11 . The acquisition unit  132  may further acquire the relationship diagram from the storage address of the relationship diagram associated with the target device  11 . The acquisition unit  132  may supply the acquired measurement data or the like to the display unit  133 . 
     The acquisition unit  132  may detect one or more storage addresses associated with the device specific information of the target device  11  with reference to the storage unit  130 . The acquisition unit  132  may acquire the measurement data, the value of the configuration parameter, or the relationship diagram by the wireless communication from the internal storage device of the target device  11  corresponding to the storage address, or the external storage device (in the present embodiment, as an example, the operation control apparatus  15 , the interface apparatus  16 , the resource management apparatus  17 , the maintenance and management apparatus  19 , the maintenance terminal  12 , or the like). 
     The acquisition unit  132  may indirectly access the target device  11  corresponding to the storage address, or the external storage device of the target device  11  via a communication device or the like. For example, by wirelessly communicating with the wireless communication device  14  externally connected to the target device  11 , or the wireless communication device  14  externally connected to the external storage device of the target device  11 , the acquisition unit  132  may indirectly access the target device  11 , or the external storage device of the target device  11  via the wireless communication device  14 . 
     In this case, the acquisition unit  132  may acquire the measurement data from two or more storage devices (in the present embodiment, as an example, the internal storage device of the device  11 , or the external storage device of the device  11 ) via one wireless communication device  14 . As an example, the acquisition unit  132  may acquire the plurality of types of measurement data related to one target device  11  from two or more storage devices via one wireless communication device  14 , or may acquire the plurality of pieces of measurement data of the same type or different types in relation to the plurality of target devices  11 . 
     In addition, by wirelessly communicating with a communication unit built in the target device  11 , or a communication unit built in the external storage device of the target device  11 , the acquisition unit  132  may directly access the target device  11 , or the external storage device of the target device  11 . As an example, when the storage address associated with the target device  11  is not an address which is able to be accessed from the wireless communication device  14 , the acquisition unit  132  may directly access the target device  11  corresponding to the storage address, or the external storage device of the target device  11 . As an example, in this case, the acquisition unit  132  may perform the wireless communication in accordance with the standard of the Bluetooth (registered trademark). It should be noted that when the acquisition unit  132  and the external storage device of the target device  11  directly communicate wirelessly, the storage device may be arranged at the field site where the process is executed in the plant. 
     2.4. Display Unit  133   
     The display unit  133  is configured to display a content acquired by the acquisition unit  132 . For example, the display unit  133  may display the measurement data acquired by the acquisition unit  132 . In addition, the display unit  133  may display the value of the configuration parameter of the target device  11 , or the relationship diagram. 
     With the above-mentioned watching terminal  13 , when the target device  11  that is looked at by the user is detected among the plurality of devices  11  existing in the plant, the measurement data related to the target device  11  is acquired from the storage address associated with the target device  11 , and is displayed. Accordingly, it is possible to check the measurement data related to the device  11  only by looking at the device  11  in the plant. 
     In addition, the storage addresses of the plurality of types of measurement data are respectively stored in association with each of at least some devices  11  among the plurality of devices  11 , and thus when the target device  11  looked at by the user is detected, the plurality of types of measurement data related to the target device  11  are acquired from the storage addresses and displayed. Accordingly, it is possible to check each of the plurality of types of measurement data related to the device  11  only by looking at the device  11 . 
     In addition, the measurement data related to at least some devices  11  among the plurality of devices  11  is stored in the external storage device of the at least some devices  11 , and the address which is in the storage device is stored in association with each of the at least some devices  11  as the storage address of the measurement data. Accordingly, when the measurement data related to the device  11  is stored outside the device  11 , it is possible to check the measurement data related to the device  11  only by the user looking at the device  11 . 
     In addition, the measurement data related to at least some other devices  11  among the plurality of devices  11  is stored in the internal storage device of each of the at least some other devices  11 , and the address which is in the storage device is stored, in association with each of the at least some other devices  11 , as the storage address of the measurement data. Accordingly, when the measurement data related to the device  11  is stored inside the device  11 , it is possible to check the measurement data related to the device  11  only by the user looking at the device  11 . Accordingly, when the measurement data related to the device  11  is stored either outside or inside the device  11 , it is possible to check the measurement data related to the device  11  only by the looking at the device  11 . 
     In addition, the measurement data related to the two or more devices  11  is stored in the single external storage device of the device  11 , and the addresses which are in the storage device and different from each other are respectively stored in association with the two or more devices  11  as the storage address of the measurement data. Accordingly, the maintenance and management system  1  can be simplified as the storage devices for the measurement data can be aggregated. 
     In addition, the measurement data related to each of the two or more devices  11  is able to be acquired via one wireless communication device  14  provided outside the apparatus 0, and thus it is possible to save the trouble of individually establishing the wireless connection with each device  11 . 
     In addition, the measurement data includes the measurement data obtained by the sensor as the device  11 , and thus it is possible to acquire the measurement data obtained by the sensor only by looking at the sensor. 
     In addition, the measurement data includes the measurement data obtained by the sensor that is provided in the device  11 , or the sensor that is provided in the accessory of the device  11 , and thus it is possible to acquire, only by looking at the device  11 , the measurement data obtained by the sensor that is provided in the device  11  or the accessory. 
     In addition, the measurement data includes the measurement data obtained by the sensor that is provided in the accessory on the upstream side or the downstream side with respect to the pipe as the device  11 , and thus it is possible to acquire, only by looking at the pipe, the measurement data obtained by the sensor that is provided in the accessory on the upstream side or the downstream side. 
     In addition, the value of the configuration parameter of the target device  11  is further acquired and displayed, and thus it is possible to check, only by looking at the device  11 , the measurement data related to the device  11  and the value of the configuration parameter. 
     In addition, the relationship diagram of the target device  11  is further acquired and displayed, and thus it is possible to check, only by looking at the device  11 , the relationship diagram showing the relationship between the device  11  and the other device  11 . 
     3. Appearance of Watching Terminal  13   
       FIG.  3    shows an appearance of the watching terminal  13 . 
     The watching terminal  13  may be a wearable computer worn by the user, and in the present embodiment, it is a so-called head-mounted display of a head-worn type as an example. The watching terminal  13  may have a helmet  1311  worn on the head of the user, goggles  1312  covering the eyes of the user, and one or more sensors  1310 . 
     The helmet  1311  protects the head of the user. It should be noted that the helmet  1311  may not be provided on the watching terminal  13 . 
     The goggles  1312  are provided on a front side portion of the watching terminal  13  and cover the eyes of the user. The goggles  1312  is an example of the display unit  133 , and may be a display of an optical transmission type. The goggles  1312  may superimpose display contents and display the contents in a field of view of the user. 
     The sensor  1310  is provided on the front side portion of the watching terminal  13 . In the present embodiment, as an example, the sensor  1310  is provided on the helmet  1311 , but may be provided on the goggles  1312 . 
     4. Operation of Watching Terminal  13   
       FIG.  4    shows an operation of the watching terminal  13 . The watching terminal  13  supports the maintenance and management of the plant by performing processing of step S 11  to step S 17 . 
     In step S 11 , the storage unit  130  stores, in association with each of the plurality of devices  11  existing in the plant, the storage address of the measurement data which is related. The storage unit  130  may further store the storage address of the value of the configuration parameter or the relationship diagram in association with the device  11 . In the present embodiment, as an example, a correspondence table between the device  11  and the storage address may be created by a plant manager to be stored in the storage unit  130 . 
     It should be noted that the processing of step S 11  may be performed each time the operation of the watching terminal  13  is started, or may be performed each time the operation of the watching terminal  13  is started with a reference interval (one month as an example). Instead of this, the processing of step S 11  may be performed only at a first operation of the watching terminal  13 , and may not be performed at a second and subsequent operations. 
     In step S 13 , the detection unit  131  detects the target device  11  that the user is looking at among the plurality of devices  11  existing in the plant. The detection unit  131  may detect the target device  11  by detecting the location and the line of sight of the user in the plant and referring to a database (not shown) in which the location coordinates of each device  11  in the plant are registered in advance. The detection unit  131  may detect the single device  11  as the target device  11 , or may detect each of the plurality of devices  11  as the target device  11 . 
     In step S 15 , the acquisition unit  132  acquires, from the storage address associated with the target device  11 , the measurement data related to the target device  11 . The acquisition unit  132  may further acquire the value of the configuration parameter of the target device  11  or the relationship diagram from the storage address. When there are the plurality of target devices  11 , the acquisition unit  132  may acquire the measurement data or the like from the storage address for each target device  11 . 
     In step S 17 , the display unit  133  displays the acquired content. When there are the plurality of target devices  11 , the display unit  133  may display the measurement data or the like for each target device  11 . As an example, the display unit  133  may display the measurement data or the like in association with each target device  11  by means of a balloon or a leader line. 
     5. Modification Example 
     It should be noted that in the embodiment described above, the goggles  1312  have been described as the display of the optical transmission type; however, the goggles  1312  may be a display of a video transmission type. In this case, the goggles  1312  may have an image capturing unit that captures an image in front of the user, and display the image captured by the image capturing unit on an inner side surface of the goggles  1312 . In addition, the detection unit  131  may specify the line of sight of the user by using the image capturing unit. As an example, the detection unit  131  may detect, as the line of sight of the user, a straight line connecting a center of the goggles  1312 , and a center of a field of view obtained by the image capturing unit. 
     In addition, when the watching terminal  13  is provided with the image capturing unit that captures the image in front of the user, the detection unit  131  may detect, as the target device  11 , the device existing in the captured image by the image capturing unit. For example, the detection unit  131  may detect the target device  11  by referring to a database in which the captured image is registered in advance for each device in the plant, and collating, with the database, an appearance of the device  11  which is acquired by performing image processing such as edge extraction processing on the captured image. Instead of this, the detection unit  131  may detect the target device  11  by a unique code being provided on an outer surface of each device  11 , and the code, which is detected in the captured image, being analyzed. The code may be a bar code, a two dimensional code (as an example, a QR code (registered trademark)), or the like, and may be provided in the device  11  by at least one of affixing, printing, or engraving. 
     In addition, the acquisition unit  132  has been described to acquire the measurement data related to the target device  11 , the value of the configuration parameter, or the relationship diagram, but may further acquire the document stored in the document database  18 . In this case, the storage unit  130  may store, as the storage address of the document, the address which is in the document database  18  in association with at least one device  11 . 
     In addition, the acquisition unit  132  has been described to acquire the measurement data, the value of the configuration parameter, the relationship diagram, or the like, by the wireless communication, but may acquire at least some of these by the wired communication. 
     In addition, the watching terminal  13  has been described to be arranged at the field site where the process is executed in the plant; however, as long as the detection unit  131  and the display unit  133  are arranged at the field site, at least one of the storage unit  130  and the acquisition unit  132  may be arranged in the management room or the instrument room of the plant, or may be arranged outside the plant. 
     In addition, the apparatus has been described as the watching terminal  13 , but may be set as the maintenance terminal  12 , or may be set as another stationary apparatus. In these cases, the detection unit  131  may be a wearable device that is separated from the storage unit  130 , the acquisition unit  132 , the display unit  133 , or the like of the apparatus, and is worn by the user. In addition, the detection unit  131  may detect the line of sight or the point of gaze of the user by using a camera that captures the eyeball of the user without being worn by the user. 
     In addition, various embodiments of the present invention may be described with reference to flowcharts and block diagrams whose blocks may represent (1) steps of processes in which operations are executed or (2) sections of apparatuses responsible for executing operations. Certain steps and sections may be implemented by dedicated circuitry, programmable circuitry supplied with computer-readable instructions stored on computer-readable media, and/or processors supplied with computer-readable instructions stored on computer-readable media. Dedicated circuitry may include digital and/or analog hardware circuits, and may include integrated circuits (IC) and/or discrete circuits. Programmable circuitry may include reconfigurable hardware circuits comprising logical AND, OR, XOR, NAND, NOR, and other logical operations, flip-flops, registers, memory elements, etc., such as field-programmable gate arrays (FPGA), programmable logic arrays (PLA), and the like. 
     A computer-readable medium may include any tangible device that can store instructions to be executed by a suitable device, and as a result, the computer-readable medium having instructions stored in the tangible device comprises an article of manufacture including instructions which can be executed to create means for executing operations specified in the flowcharts or block diagrams. Examples of the computer-readable medium may include an electronic storage medium, a magnetic storage medium, an optical storage medium, an electromagnetic storage medium, a semiconductor storage medium, etc. Specific examples of the computer-readable medium may include a floppy (Registered Trademark) disk, a diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an electrically erasable programmable read-only memory (EEPROM), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disc (DVD), a Blu-ray (registered trademark) disc, a memory stick, an integrated circuit card, or the like. 
     The computer-readable instructions may include assembler instructions, instruction-set-architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state-setting data, or either source code or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, JAVA (registered trademark), C++ or the like, and conventional procedural programming languages, such as the “C” programming language or similar programming languages. 
     Computer-readable instructions may be provided to a processor of a general-purpose computer, special purpose computer, or other programmable data processing apparatus, or to programmable circuitry, locally or via a local area network (LAN), wide area network (WAN) such as the Internet, etc., so that the computer-readable instructions are executed to create means for executing operations specified in the flowcharts or block diagrams. Examples of the processor include a computer processor, a processing unit, a microprocessor, a digital signal processor, a controller, a microcontroller, and the like. 
       FIG.  5    shows an example of a computer  2200  in which a plurality of aspects of the present invention may be entirely or partially embodied. A program that is installed in the computer  2200  can cause the computer  2200  to function as operations associated with apparatuses according to the embodiments of the present invention or one or more sections of the apparatuses, or can cause the computer  2200  to execute the operations or the one or more sections thereof, and/or can cause the computer  2200  to execute processes according to the embodiments of the present invention or steps of the processes. Such a program may be executed by a CPU  2212  to cause a computer  2200  to execute certain operations associated with some or all of the blocks of flowcharts and block diagrams described herein. 
     The computer  2200  according to the present embodiment includes the CPU  2212 , a RAM  2214 , a graphics controller  2216 , and a display device  2218 , which are interconnected by a host controller  2210 . The computer  2200  also includes input/output units such as a communication interface  2222 , a hard disk drive  2224 , a DVD-ROM drive  2226 , and an IC card drive, which are connected to the host controller  2210  via an input/output controller  2220 . The computer also includes legacy input/output units such as a ROM  2230  and a keyboard  2242 , which are connected to the input/output controller  2220  via an input/output chip  2240 . 
     The CPU  2212  operates according to programs stored in the ROM  2230  and the RAM  2214 , thereby controlling each unit. The graphics controller  2216  obtains image data generated by the CPU  2212  on a frame buffer or the like provided in the RAM  2214  or in the graphics controller  2216  itself, and causes the image data to be displayed on the display device  2218 . 
     The communication interface  2222  communicates with other electronic devices via a network. The hard disk drive  2224  stores programs and data used by the CPU  2212  within the computer  2200 . The DVD-ROM drive  2226  reads the programs or the data from a DVD-ROM  2201 , and provides the hard disk drive  2224  with the programs or the data via the RAM  2214 . The IC card drive reads the programs and the data from the IC card, and/or writes the programs and the data to the IC card. 
     The ROM  2230  stores therein a boot program or the like executed by the computer  2200  at the time of activation, and/or a program depending on the hardware of the computer  2200 . The input/output chip  2240  may also connect various input/output units to the input/output controller  2220  via a parallel port, a serial port, a keyboard port, a mouse port, and the like. 
     A program is provided by the computer-readable medium such as the DVD-ROM  2201  or the IC card. The program is read from the computer-readable medium, installed in the hard disk drive  2224 , the RAM  2214 , or the ROM  2230 , which is also an example of the computer-readable medium, and executed by the CPU  2212 . The information processing written in these programs is read into the computer  2200 , resulting in cooperation between a program and the above-mentioned various types of hardware resources. An apparatus or method may be constituted by realizing the operation or processing of information in accordance with the usage of the computer  2200 . 
     For example, when a communication is executed between the computer  2200  and an external device, the CPU  2212  may execute a communication program loaded in the RAM  2214 , and instruct the communication interface  2222  to process the communication based on the processing written in the communication program. The communication interface  2222 , under control of the CPU  2212 , reads transmission data stored on a transmission buffering region provided in a recording medium such as the RAM  2214 , the hard disk drive  2224 , the DVD-ROM  2201 , or the IC card, and transmits the read transmission data to a network or writes reception data received from a network to a reception buffering region or the like provided on the recording medium. 
     In addition, the CPU  2212  may cause all or a necessary portion of a file or a database to be read into the RAM  2214 , the file or the database having been stored in an external recording medium such as the hard disk drive  2224 , the DVD-ROM drive  2226  (the DVD-ROM  2201 ), the IC card, etc., and execute various types of processing on the data on the RAM  2214 . The CPU  2212  then writes back the processed data to the external recording medium. 
     Various types of information, such as various types of programs, data, tables, and databases, may be stored in the recording medium to undergo information processing. The CPU  2212  may execute various types of processing on the data read from the RAM  2214  to write back a result to the RAM  2214 , the processing being described throughout the present disclosure, specified by instruction sequences of the programs, and including various types of operations, information processing, condition determinations, conditional branching, unconditional branching, information retrievals/replacements, or the like. In addition, the CPU  2212  may search for information in a file, a database, etc., in the recording medium. For example, when a plurality of entries, each having an attribute value of a first attribute associated with an attribute value of a second attribute, are stored in the recording medium, the CPU  2212  may search for an entry matching the condition whose attribute value of the first attribute is designated, from among the plurality of entries, and read the attribute value of the second attribute stored in the entry, thereby obtaining the attribute value of the second attribute associated with the first attribute satisfying the predetermined condition. 
     The above-described program or software modules may be stored in the computer-readable medium on the computer  2200  or near the computer  2200 . In addition, a recording medium such as a hard disk or a RAM provided in a server system connected to a dedicated communication network or the Internet can be used as a computer-readable medium, thereby providing the program to the computer  2200  via the network. 
     While the embodiments of the present invention have been described, the technical scope of the invention is not limited to the above-described embodiments. It is apparent to persons skilled in the art that various alterations and improvements can be added to the above-described embodiments. It is also apparent from the scope of the claims that the embodiments added with such alterations or improvements can be included in the technical scope of the invention. 
     The operations, procedures, steps, and stages of each process performed by an apparatus, system, program, and method shown in the claims, embodiments, or diagrams can be performed in any order as long as the order is not indicated by “prior to,” “before,” or the like and as long as the output from a previous process is not used in a later process. Even if the process flow is described using phrases such as “first” or “next” in the claims, embodiments, or diagrams, it does not necessarily mean that the process must be performed in this order. 
     EXPLANATION OF REFERENCES 
     
         
           1  maintenance and management system 
           11  device 
           12  maintenance terminal 
           13  watching terminal 
           14  wireless communication device 
           15  operation control apparatus 
           16  interface apparatus 
           17  resource management apparatus 
           18  document database 
           19  maintenance and management apparatus 
           100  control network 
           101  network 
           130  storage unit 
           131  detection unit 
           132  acquisition unit 
           133  display unit 
           1310  sensor 
           1311  helmet 
           1312  goggles 
           1900  device ledger 
           2200  computer 
           2201  DVD-ROM 
           2210  host controller 
           2212  CPU 
           2214  RAM 
           2216  graphics controller 
           2218  display device 
           2220  input/output controller 
           2222  communication interface 
           2224  hard disk drive 
           2226  DVD-ROM drive 
           2230  ROM 
           2240  input/output chip 
           2242  keyboard