JP7623165B2 - Identification information display system and identification information display device - Google Patents

Description

Embodiments of the present invention relate to an identification information display system and an identification information display device.

Conventionally, when performing maintenance or troubleshooting of a control center, device information related to the control center is required. Device information related to the control center is device information for each control center or control unit, and is, for example, information showing various drawings such as outline drawings, circuit diagrams, and terminal diagrams, the state of device settings, and various documents such as instruction manuals and work procedure manuals, and is information necessary for performing maintenance or troubleshooting. Conventionally, such device information was managed and provided on paper media, but due to the huge amount of information and the impracticality of carrying around a huge amount of paper media, it has become mainstream in recent years to manage and provide device information as electronic data. In particular, with the spread of smartphones and the like, it has been proposed to provide device information by data communication via a highly versatile mobile communication terminal that individuals use on a daily basis, rather than a dedicated terminal, by using identification information such as a QR code (registered trademark).

For example, Patent Document 1 discloses a configuration in which electronic data of device information is stored in a centralized manner on a server, and a mobile communication terminal accesses the server via a communication facility such as an Internet line, whereby the mobile communication terminal downloads the device information from the server and provides the device information to an operator.

JP 2018-137951 A

However, if the power supply to the control center from the outside is cut off due to a power outage, or if access to the server becomes impossible due to a communication failure in the server or communication equipment, the device information cannot be provided to the workers.

The embodiment has been developed in consideration of the above circumstances, and its purpose is to provide an identification information display system and an identification information display device that can appropriately provide device information related to the control center to workers.

An identification information display system according to an embodiment includes an identification information display device provided in a control center and a mobile communication terminal. The identification information display device includes an identification information presenting unit that presents identification information even when power supply to at least the control center is cut off, an information storage unit that stores device information related to the control center, a center-side communication unit that transmits the device information to the mobile communication terminal when a data request transmitted from the mobile communication terminal in response to the identification information being read by the mobile communication terminal is received, and a backup power supply that is driven when power supply to the control center is cut off . The mobile communication terminal includes an identification information reading unit that reads the identification information, a terminal-side communication unit that transmits the data request to the identification information display device in response to the identification information being read by the identification information reading unit and receives the device information transmitted from the identification information display device, and an information display unit that displays the device information received by the terminal-side communication unit. The identification information presentation unit is a display capable of displaying the identification information by receiving power from an external source to the control center, and when the power supply to the control center from the outside is cut off, the backup power source is driven to display the identification information.

Functional block diagram of an identification information display system according to a first embodiment Perspective view of the control center FIG. 1 is a perspective view showing a state in which some of the doors are open. Diagram showing QR code Diagram showing a barcode Diagram showing any mark Functional block diagram of a mobile communication terminal Process flow diagram Process flow diagram Functional block diagram of an identification information display system according to a second embodiment A diagram showing where to attach the identification information display unit Functional block diagram of an identification information display system according to a third embodiment Process flow diagram Process flow diagram Functional block diagram of an identification information display system according to a fourth embodiment FIG. 1 shows a form in which an identification information display device is installed. FIG. 1 shows a form in which an identification information display device is installed.

Several embodiments will be described below with reference to the drawings. In the description of several embodiments, substantially identical components will be given the same reference numerals and the description will be omitted.

First Embodiment
A first embodiment will be described with reference to Fig. 1 to Fig. 9. As shown in Fig. 1, an identification information display system 1 according to the embodiment includes an identification information display device 3 provided in a control center 2 (see Fig. 2 and Fig. 3), and a mobile communication terminal 4. The mobile communication terminal 4 is, for example, a smartphone, a tablet terminal, or a notebook computer, and is a portable terminal equipped with a communication function. The identification information display device 3 and the mobile communication terminal 4 are capable of data communication between each other via wired communication or wireless communication.

As shown in FIG. 2, the control center 2 is composed of a housing 5 whose outer frame is in the shape of a rectangular prism, and at the opening on the front side, multiple horizontally elongated doors 6 (six in FIG. 2) are arranged vertically and can be opened and closed, as well as one vertically elongated door 7 which can be opened and closed.

Inside the control center 2, spaces corresponding to the doors 6 and 7 are provided. As shown in FIG. 3, a plurality of slots are provided in the spaces corresponding to the plurality of doors 6, and a control unit 8 serving as a load control device is installed in the plurality of slots. The space corresponding to the door 7 is used as a storage section 9 for storing electric wires (not shown) and a terminal block (not shown). When the door 6 is in an open state, the control unit 8 is exposed, and when the door 7 is in an open state, the electric wires and terminal block are exposed. The control units 8 may have the same specifications or different specifications.

The control unit 8 is provided with a circuit breaker operating handle 10 and is formed with a storage section capable of storing a multi-relay, and when the multi-relay is not stored in the storage section, the above-mentioned identification information display device 3 is stored in the storage section. The door 6 is formed with openings 6a and 6b, and when the door 6 is in a closed state, the circuit breaker operating handle 10 is exposed from the opening 6a, and the multi-relay or the identification information display device 3 is exposed from the opening 6b. Figure 3 illustrates a case in which the first and fourth doors 6 and 7 from the top are open, and the identification information display device 3 is stored in the storage section of the control unit 8 on the first and fourth levels.

The identification information display device 3 includes a power supply unit 11, a storage device 12, a communication device 13, and an identification information display unit 14. The storage device 12 corresponds to an information storage unit, the communication device 13 corresponds to a center-side communication unit, and the identification information display unit 14 corresponds to an identification information presentation unit.

The power supply unit 11 includes an AC/DC conversion circuit 15, a power detection circuit 16, a charging circuit 17, a standby power supply 18 such as a storage battery, and a power supply switching circuit 19. The AC/DC conversion circuit 15 converts the power supplied from the motor control center (hereinafter referred to as MCC) from an AC power supply to a DC power supply and supplies it to the power supply detection circuit 16, the charging circuit 17, and the power supply switching circuit 19.

The power supply detection circuit 16 measures the voltage value of the power supplied from the AC/DC conversion circuit 15, judges whether the power supply from the MCC is normal or not, and outputs the judgment result to the power supply switching circuit 19. That is, if the voltage value of the power supplied from the AC/DC conversion circuit 15 is equal to or higher than a predetermined value, the power supply detection circuit 16 judges that the power supply from the MCC is normal and outputs a normal signal to the power supply switching circuit 19. If the voltage value of the power supplied from the AC/DC conversion circuit 15 is less than a predetermined value, the power supply detection circuit 16 judges that the power supply from the MCC is abnormal and outputs an abnormality signal to the power supply switching circuit 19. When the power supply from the MCC to the control center 2 is cut off, the voltage value of the power supplied from the AC/DC conversion circuit 15 drops to less than the predetermined value, so the power supply detection circuit 16 outputs an abnormality signal to the power supply switching circuit 19. The charging circuit 17 supplies the power supplied from the AC/DC conversion circuit 15 to the standby power supply 18 and charges the standby power supply 18.

The power supply switching circuit 19 has a fixed contact 19a connected to the storage device 12, the communication device 13, and the identification information display unit 14, a first movable contact 19b connected to the AC/DC conversion circuit 15, and a second movable contact 19c connected to the backup power supply 18. During a period when a normal signal is input from the power supply switching circuit 19, the power supply switching circuit 19 maintains a first connection state (a state shown by a solid line in FIG. 1) in which the fixed contact 19a and the first movable contact 19b are connected, and switches so that power from the AC/DC conversion circuit 15 is supplied to the storage device 12, the communication device 13, and the identification information display unit 14. On the other hand, during a period when an abnormal signal is input from the power supply switching circuit 19, the power supply switching circuit 19 maintains a second connection state (a state shown by a dashed line in FIG. 1) in which the fixed contact 19a and the second movable contact 19c are connected, and switches so that power from the backup power supply 18 is supplied to the storage device 12, the communication device 13, and the identification information display unit 14.

The storage device 12 stores electronic data of device information for each control center 2 and control unit 8. Device information is information showing, for example, various drawings such as outline drawings, circuit diagrams, and terminal diagrams, the state of device settings, and various documents such as instruction manuals and work procedures, such as the main circuit phase color and symbol, the type of wire, auxiliary circuit wiring, rating, structure, main equipment specifications, load capacity, and the type of control unit 8. Device information is necessary when performing maintenance or troubleshooting.

The communication device 13 performs data communication with the mobile communication terminal 4 in a powered state, and when it receives a data request transmitted from a communication unit of the mobile communication terminal 4 described later, it outputs the data request to the storage device 12, reads out the device information stored in the storage device 12, and transmits the read out device information to the communication unit of the mobile communication terminal 4. The identification information display unit 14 is, for example, a liquid crystal display, and electrically displays the identification information in a powered state. The identification information is information that can be optically read by the mobile communication terminal 4, and may be, for example, a two-dimensional code such as a QR code (registered trademark) shown in FIG. 4, a one-dimensional code such as a barcode shown in FIG. 5, or an arbitrary mark shown in FIG. 6. Although a character string of English letters and numbers is shown as an example in FIG. 6, figures, symbols, etc. may also be used.

As shown in FIG. 7, the mobile communication terminal 4 includes a control unit 20, an operation unit 21, a reader 22, a communication unit 23, a storage unit 24, and a display unit 25 consisting of, for example, a liquid crystal display. The reader 22 corresponds to an identification information reading unit, the communication unit 23 corresponds to a terminal-side communication unit, and the display unit 25 corresponds to an information display unit.

The control unit 20 is mainly composed of a microcomputer having a CPU, RAM, ROM, I/O, etc. A control program that controls the mobile communication terminal 4 is stored in the ROM, and the control unit 20 executes processes such as controlling each part of the mobile communication terminal 4 by reading and executing the control program by the CPU.

The operation unit 21 is a mechanical button provided at a predetermined position on the housing of the mobile communication terminal 4 or a touch key displayed on the display unit 25, and when the worker operates it, it outputs an operation notification indicating the operation content to the control unit 20. The reader 22 is, for example, a camera, and is activated when an activation instruction is input from the control unit 20, making it possible to read the identification information. When the reader 22 is held up to the above-mentioned identification information display unit 14, it reads the identification information displayed on the identification information display unit 14, and when the identification information has been successfully read, it outputs a reading completion notification to the control unit 20. That is, when the worker operates the operation unit 21 to start the reader 22, the control unit 20 outputs a start-up instruction to the reader 22 to start the reader 22 and starts an application that reads the identification information, and when the worker holds the reader 22 over the identification information display unit 14, the control unit 20 causes the reader 22 to read the identification information displayed on the identification information display unit 14, and inputs a reading completion notification from the reader 22, thereby determining that the reader 22 has successfully read the identification information.

When the communication unit 23 receives a communication instruction from the control unit 20, it transmits a data request. Furthermore, when the communication unit 23 receives the device information transmitted from the communication device 13 of the identification information display device 3 as a result of the transmitted data request being received by the communication device 13 of the identification information display device 3, it outputs a reception completion notification to the control unit 20. When the control unit 20 receives a reception completion notification from the communication unit 23, it stores the received device information in the memory unit 24 and outputs a display instruction to the display unit 25, causing the display unit 25 to display the received device information.

Next, the operation of the above-mentioned configuration will be described with reference to Figures 8 and 9. Here, we will explain the operation during normal operation when the power supply from the MCC is normal, and when a power outage occurs.

(1) During normal operation When the power supply from the MCC is normal, the power supply switching circuit 19 of the identification information display device 3 maintains the first connection state, the device operates using the power supplied from the MCC as the operating power supply, and the identification information is displayed on the identification information display unit 14 (A1). In this state, when the worker activates the reader 22 of the portable communication terminal 4 and holds it over the identification information display unit 14, the portable communication terminal 4 reads the identification information displayed on the identification information display unit 14 with the reader 22, and when reading of the identification information is normally completed (B1), the portable communication terminal 4 transmits a data request from the communication unit 23 (B2).

When the identification information display device 3 receives a data request transmitted from the communication unit 23 of the mobile communication terminal 4 by the communication device 13 (A2), it identifies the device information to be transmitted from among the device information stored in the storage device 12 based on the read identification information (A3). When the identification information display device 3 identifies the device information to be transmitted, it reads the identified device information from the storage device 12 (A4) and transmits the read device information from the communication device 13 (A5).

When the mobile communication terminal 4 receives the device information transmitted from the communication device 13 of the identification information display device 3 by the communication unit 23 (B3), it stores the received device information in the memory unit 24 (B4) and displays it on the display unit 25 (B5). That is, by having the reader 22 read the identification information displayed on the identification information display device 3, the worker can read out the device information stored in the identification information display device 3 and display it on the display unit 25, thereby allowing the worker to view the device information.

(2) When a power outage occurs When the power supply from the MCC is cut off due to a power outage (A11), the power detection circuit 16 detects an abnormality in the power supply from the MCC (A12), and the power switching circuit 19 switches the connection state from the first connection state to the second connection state (A13). When the connection state of the power switching circuit 19 switches from the first connection state to the second connection state, the identification information display device 3 operates using the power supplied from the backup power source 18 as the operating power source (A14), and the identification information can be displayed on the identification information display unit 14 even when a power outage occurs, and displays the identification information on the identification information display unit 14 (A15). In this state, when the worker activates the reader 22 of the mobile communication terminal 4 and holds it over the identification information display unit 14, the mobile communication terminal 4 reads the identification information displayed on the identification information display unit 14 with the reader 22 and performs the same processing as during normal operation as described above (B1 to B5). The identification information display device 3 also performs the same processing as during normal operation as described above (A2 to A5). In other words, even during a power outage, just as during normal operation, the operator can have the reader 22 read the identification information displayed on the identification information display device 3, read out the device information stored in the identification information display device 3, and display it on the display unit 25, thereby enabling the operator to view the device information.

According to the first embodiment described above, the following effects can be obtained. In the identification information display device 3, even if the power supply to the control center 2 is cut off, the identification information is displayed by the backup power source 18, and when a data request transmitted from the mobile communication terminal 4 in response to the identification information being read by the mobile communication terminal 4 is received, the device information is transmitted to the mobile communication terminal 4, and when the mobile communication terminal 4 receives the device information transmitted from the identification information display device 3, the received device information is displayed.

Even if the power supply to the control center 2 from the outside is cut off due to a power outage or the like, the identification information is displayed on the identification information display device 3 as in normal operation, and the identification information can be read. The identification information is read by the reader 22, and the device information can be displayed by the mobile communication terminal 4. Furthermore, since the device information is not stored in an external server but is stored in the storage device 12, there is no need to access the server, and the effects of communication failures in the server or communication equipment can be avoided. As a result, even if the power supply to the control center 2 from the outside is cut off due to a power outage or the like, or if access to the server becomes impossible due to communication failures in the server or communication equipment, the device information related to the control center 2 can be appropriately provided to the worker.

The identification information display unit 14 is configured as a liquid crystal display and displays the identification information electrically, so the contents of the identification information can be easily changed by software processing, and requests to change the contents of the identification information can be easily accommodated.

If the device information is transmitted from the identification information display device 3 to the mobile communication terminal 4 via wired communication, the device information can be transmitted appropriately without being affected by the radio wave environment. If the device information is transmitted from the identification information display device 3 to the mobile communication terminal 4 via wireless communication, transmission paths such as cables can be omitted, and the device information can be transmitted from the identification information display device 3 to the mobile communication terminal 4 while moving around with the mobile communication terminal 4, improving operability.

Second Embodiment
The second embodiment will be described with reference to Figs. 10 and 11. In the first embodiment, the identification information display unit 14 is, for example, a liquid crystal display, and is configured to electrically display the identification information when power is supplied, but in the second embodiment, the identification information is provided in the form of a sticker on which the identification information is printed on a mount. As shown in Fig. 10, the identification information display device 31 is obtained by omitting the identification information display unit 14 from the identification information display device 3 described in the first embodiment, and an identification information display unit 32 is prepared separately from the identification information display device 31. As shown in Fig. 11, the identification information display unit 32 is a sticker 34 on which the identification information is printed on a mount 33. The sticker 34 can be attached to any desired location, such as the back side of the doors 6 and 7, the front side of the control unit 8, or a predetermined location on the housing 5. In addition, when the identification information display unit 31 is provided in the storage unit 9, a mounting plate 35 can be provided and the sticker 34 can be attached to the mounting plate 35.

In this case, regardless of whether the system is operating normally or if a power outage has occurred, the operator can have the reader 22 read the identification information printed on the backing 33 of the sticker 34, and similarly to the first embodiment, a data request is sent from the mobile communication terminal 4 to the identification information display device 31, and the identification information display device 31 sends device information to the mobile communication terminal 4, so that the device information stored in the identification information display device 3 can be read and displayed on the display unit 25, allowing the operator to view the device information.

According to the second embodiment described above, the identification information is provided in the form of a sticker. Even if the power supply to the control center 2 is cut off from the outside due to a power outage or the like, the identification information can be read, as in the first embodiment, and the device information can be displayed by the mobile communication terminal 4 by reading the identification information by the reader 22. Furthermore, by eliminating the power supply from the backup power source 18 to the identification information display unit 14 described in the first embodiment, power can be saved by consuming the power supply from the backup power source 18 for the storage device 12 and communication device 13.

Third Embodiment
The third embodiment will be described with reference to Fig. 12 to Fig. 14. In the third embodiment, an identification information display device cooperates with a multi-relay to display identification information corresponding to fault information transmitted from the multi-relay. As shown in Fig. 12, an identification information display device 41 includes a power supply unit 42 instead of the power supply unit 11 described in the first embodiment. The power supply unit 42 does not include the AC/DC conversion circuit 15 from the power supply unit 11 described in the first embodiment, and is supplied with power from a multi-relay 43. That is, the power supply of the multi-relay 43 is used.

The multi-relay 43 is a control and monitoring device installed for each load control device, and is composed of electronic devices. The multi-relay 43 transmits fault information as data information to the communication device 13. When the communication device 13 receives the fault information transmitted from the multi-relay 43, it outputs the received fault information to the storage device 12. The storage device 12 stores a plurality of pieces of identification information, and when fault information is input from the communication device 13, it identifies the input fault information, selects identification information corresponding to the identified fault information from the plurality of pieces of identification information, and outputs the selected identification information to the identification information display unit 14. When the identification information is input from the storage device 12, the identification information display unit 14 displays the input identification information. That is, the identification information display unit 41 uses the fault information input from the multi-relay 43 to change the identification information displayed on the identification information display unit 14. If the multi-relay 43 has only a wired communication function as a communication function, the fault information may be transmitted by wired communication, and if the multi-relay 43 has a wireless communication function as a communication function, the fault information may be transmitted by wireless communication.

Next, the operation of the above-mentioned configuration will be described with reference to Figures 13 and 14. Here, we will explain what happens when a failure occurs and what happens when the failure is fixed.

(1) When a fault occurs When the multi-relay 43 detects a fault (C1), it transmits fault information to the identification information display device 41 (C2). When the identification information display device 41 receives the fault information transmitted from the multi-relay 43 by the communication device 13 (A21), it identifies the received fault information (A22), selects the identification information corresponding to the identified fault information from among the identification information stored in the storage device 12 (A23), and displays the selected identification information on the identification information display unit 14 (A24). In this state, when the worker activates the reader 22 of the mobile communication terminal 4 and holds it over the identification information display unit 14, the mobile communication terminal 4 reads the identification information displayed on the identification information display unit 14 by the reader 22 and performs the same processing as in the first embodiment described above (B1 to B5). The identification information display device 41 also performs the same processing as in the first embodiment described above (A2 to A5).

(2) When the multi-relay 43 detects a recovery from a failure (C11), it transmits a recovery notification to the identification information display device 41 (C12). When the identification information display device 41 receives the recovery notification transmitted from the multi-relay 43 by the communication device 13 (A31), it specifies the recovery from the failure (A32), selects the identification information during normal operation from the identification information stored in the storage device 12 (A33), and displays the selected identification information during normal operation on the identification information display unit 14 (A34). In this state, when the worker activates the reader 22 of the portable communication terminal 4 and holds it over the identification information display unit 14, the portable communication terminal 4 reads the identification information displayed on the identification information display unit 14 by the reader 22 and performs the same processing as in the first embodiment described above (B1 to B5). The identification information display device 41 also performs the same processing as in the first embodiment described above (A2 to A5).

According to the third embodiment described above, the identification information display device 41 works in conjunction with the multi-relay 43 to display identification information corresponding to the fault information transmitted from the multi-relay 43. It is possible to select device information corresponding to the fault information and provide it appropriately to the worker, such as providing a procedure manual suited to the contents of the trouble. In addition, the power supply of the multi-relay 43 is reused. By omitting the AC/DC conversion circuit 15, the power supply unit 42 can be simplified.

Fourth Embodiment
The fourth embodiment will be described with reference to Fig. 15. In the fourth embodiment, an identification information display device is incorporated in a multi-relay. As shown in Fig. 15, an identification information display device 41 is incorporated in a multi-relay 51. In this case, the identification information display device 41 is incorporated in the multi-relay 51 in a form mounted on a board, for example.

According to the fourth embodiment described above, the identification information display device 41 is incorporated in the multi-relay 51. By displaying the identification information corresponding to the fault information transmitted from the multi-relay 51, similar to the third embodiment, it is possible to provide the operator with appropriate device information corresponding to the fault information by selecting the appropriate procedure manual for the content of the trouble. By integrating it with the multi-relay 51, it is possible to save space.

Other Embodiments
In the first to fourth embodiments, as shown in Fig. 16, a configuration has been exemplified in which the identification information display device 3, 31, 41 is provided for each of the plurality of control units 8, but as shown in Fig. 17, a configuration in which the identification information display device 3, 31, 41 is provided in common to the plurality of control units 8 may also be used. Also, as described in the second embodiment, a mounting plate 35 may be provided in the storage section 9, and the identification information display device 3, 31, 41 may be provided on the mounting plate 35.

Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims.

In the drawing, 1 is an identification information display system, 2 is a control center, 3, 31, and 41 are identification information display devices, 4 is a mobile communication terminal, 12 is a storage device (information storage section), 13 is a communication device (center side communication section), 14 and 32 are identification information display sections (identification information presentation sections), 22 is a reader (identification information reading section), 23 is a communication section (terminal side communication section), 25 is a display section (information display section), and 43 and 51 are multi-relays.

Claims (11)

An identification information display system including an identification information display device provided in a control center and a mobile communication terminal,
The identification information display device includes:
an identification information presenting unit that presents the identification information even when power supply to at least the control center is cut off;
an information storage unit that stores device information related to the control center;
a center side communication unit that, upon receiving a data request transmitted from the portable communication terminal in response to the identification information being read by the portable communication terminal, transmits the device information to the portable communication terminal;
a backup power supply that is activated when power supply to the control center is cut off ;
The mobile communication terminal includes:
an identification information reading unit that reads the identification information;
a terminal side communication unit that transmits the data request to the identification information display device in response to the identification information being read by the identification information reading unit, and receives the device information transmitted from the identification information display device;
an information display unit that displays the device information received by the terminal side communication unit ,
The identification information presentation unit is a display device capable of displaying the identification information by receiving power from an external source to the control center, and the identification information display system displays the identification information by being driven by the backup power source when the power supply to the control center from the outside is cut off . 2. The identification information display system according to claim 1, wherein the identification information presenting section receives data information from a multi-relay and displays the identification information according to the received data information . 3. The identification information display system according to claim 2, wherein the identification information presenting unit receives failure information as the data information from the multi-relay, and displays the identification information corresponding to the received failure information . An identification information display system described in any one of claims 1 to 3, wherein the terminal side communication unit transmits the data request to the identification information display device via wired communication, and the center side communication unit transmits the device information to the mobile communication terminal via wired communication . An identification information display system described in any one of claims 1 to 3, wherein the terminal side communication unit transmits the data request to the identification information display device via wireless communication, and the center side communication unit transmits the device information to the mobile communication terminal via wireless communication . An identification information display system including an identification information display device provided in a control center and a mobile communication terminal,
The identification information display device includes:
an identification information presenting unit that presents the identification information even when power supply to at least the control center is cut off;
an information storage unit that stores device information related to the control center;
a center side communication unit that, upon receiving a data request transmitted from the portable communication terminal in response to the identification information being read by the portable communication terminal, transmits the device information to the portable communication terminal;
The mobile communication terminal includes:
an identification information reading unit that reads the identification information;
a terminal side communication unit that transmits the data request to the identification information display device in response to the identification information being read by the identification information reading unit, and receives the device information transmitted from the identification information display device;
an information display unit that displays the device information received by the terminal side communication unit,
The identification information display system , wherein the terminal side communication unit transmits the data request to the identification information display device by wired communication, and the center side communication unit transmits the device information to the portable communication terminal by wired communication . 7. The identification information display system according to claim 6 , wherein the identification information presenting section is a printed matter on which the identification information is printed . 8. The identification information display system according to claim 1 , wherein the identification information display device is incorporated in a multi-relay . 9. The identification information display system according to claim 1, wherein the identification information display device is provided for each control unit incorporated in the control center . 9. The identification information display system according to claim 1, wherein the identification information display device is provided in common to a plurality of control units incorporated in the control center . An identification information display device used in an identification information display system together with a portable communication terminal that transmits a data request to an identification information display device in response to reading identification information, and displays the received device information upon receiving the device information transmitted from the identification information display device,
an identification information presenting unit that presents the identification information even when power supply to at least the control center is cut off;
an information storage unit that stores device information related to the control center;
a center side communication unit that, upon receiving a data request transmitted from the portable communication terminal in response to the identification information being read by the portable communication terminal, transmits the device information to the portable communication terminal;
a backup power supply that is activated when power supply to the control center is cut off ;
The identification information presentation unit is a display device capable of displaying the identification information by receiving power from an external source to the control center, and an identification information display device that displays the identification information by being driven by the backup power source when the power supply to the control center from the outside is cut off .

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