JP6641502B2 - Inspection device, control system, and inspection method - Google Patents

Description

  The present invention relates to an inspection device, a control system, and an inspection method.

  Conventionally, various control systems have been introduced in buildings represented by buildings and factories. For example, in a lighting system (lighting control system), a master device (for example, a central control device) and a slave device (for example, a wall switch or a relay terminal) are connected via a communication line. Note that the master device supplies a transmission signal that also serves as power supply to the communication line, and the slave device (for example, a wall switch) operates by receiving the transmission signal through the communication line. In general, there are a plurality of systems in a lighting system, and one system includes one master device and a plurality of slave devices. The different systems operate in a state of being electrically disconnected.

  In such a lighting system, for example, an operator may erroneously connect the systems during construction. If power is applied to the lighting system in this state, the power supply of both master devices will be short-circuited, and the devices at the output will be destroyed, or will be easily damaged after operation due to electrical stress, As a result, a communication failure occurs.

  As a prior art for coping with erroneous connection (erroneous connection), Patent Literature 1 discloses an invention of a circuit breaker inserted in a power supply path between a DC power supply and a load.

Japanese Patent No. 5043642

  The invention of Patent Literature 1 aims at protection against short circuit due to erroneous connection, and erroneous connection is detected after operation (energization).

  However, in a control system represented by a lighting system, a large number of devices are connected, and if a device equivalent to a circuit breaker or an incorrect connection detection unit is incorporated in each device, there is a concern that the cost will increase significantly. Is done. In addition, in the control system, power may not be supplied to the entire building at the time of construction, and there is a need for a technology capable of inspecting for erroneous connection before operation.

  The present invention has been made in order to solve the above-described problems, and provides an inspection apparatus, a control system, and an inspection method capable of appropriately inspecting the presence or absence of an erroneous connection before operation. With the goal.

In order to achieve the above object, an inspection device according to the present invention includes:
An inspection device in a control system to be operated in a state where the first system and the second system are electrically disconnected,
A master device and a slave device are connected to the first and second systems via communication lines, respectively, and when the power is turned on, the master device supplies a transmission signal also serving as power supply to the communication line, The slave device operates by receiving the transmission signal through the communication line,
A measurement unit that measures electrical characteristics of the communication line in the first system in a state where power is not supplied to the control system;
Based on the electrical characteristics and a threshold determined according to the configuration of the master device and the slave device in the first system, the presence or absence of an erroneous connection between the first system and the second system is displayed. A display unit,
Is provided.

  In the inspection device according to the present invention, the electric characteristic (for example, AC impedance) of the communication line in the first system is measured in a state where the power is not supplied to the control system, and the first characteristic is determined according to the electric characteristic. The presence or absence of an erroneous connection between the second system and the second system is displayed. As a result, it is possible to appropriately inspect whether there is an erroneous connection before operation.

FIG. 1 is a schematic diagram illustrating an example of an overall configuration of a lighting system according to a first embodiment of the present invention. Schematic diagram for explaining an example of a transmission signal on a communication line 1 is a block diagram illustrating an example of a configuration of an inspection device according to a first embodiment. Graph showing differences in input impedance of each device Schematic diagram for explaining a parallel circuit model for obtaining a combined impedance Graph showing the characteristics of the combined impedance in a system (normal system and erroneously connected system) composed of the device of model F Graph showing the characteristics of the combined impedance in a system (normal system and erroneously connected system) constituted by the devices of model M Graph for explaining a threshold value in a system composed of devices of model M Flowchart for explaining inspection processing according to the first embodiment of the present invention FIG. 2 is a schematic diagram illustrating an example of an overall configuration of a lighting system according to a second embodiment of the present invention. FIG. 2 is a block diagram illustrating an example of a configuration of an inspection device according to a second embodiment. 4 is a flowchart for explaining a preliminary inspection process according to the second embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals. Hereinafter, a case where the present invention is applied to a lighting system (lighting control system) will be described as a specific example of a control system. However, as described later, the present invention can be similarly applied to other control systems. it can. That is, the embodiments described below are for explanation, and do not limit the scope of the present invention. Therefore, those skilled in the art can adopt embodiments in which each of these elements or all elements are replaced with equivalents, but these embodiments are also included in the scope of the present invention.

(Embodiment 1)
FIG. 1 is a schematic diagram illustrating an example of an overall configuration of a lighting system 1 according to Embodiment 1 of the present invention. The lighting system 1 is divided into a plurality of systems (for example, A system and B system), and one master device 10 and a plurality of slave devices 20 are connected via a communication line 30 for each system. I have. The inspection device 40 is connected to the communication line 30 of one system (for example, the B system).

  The A-system communication line 30 and the B-system communication line 30 should be operated in an electrically disconnected state. However, as shown by a dotted line L, the systems are erroneously connected (erroneous wiring). It can happen.

  Although not shown in FIG. 1, it is assumed that a lighting fixture is connected to some slave devices 20 (for example, a relay terminal).

  The master device 10 is, for example, a central control device that stores the address of each slave device 20, and controls the slave device 20 via the communication line 30. As an example, a transmission signal as shown in FIG. 2 flows through the communication line 30, and data is exchanged between the master device 10 and the slave device 20. Specifically, the master device 10 simultaneously performs power supply and signal transmission to the slave device 20 (for example, a wall switch) in the voltage mode of ± 24 V. That is, the master device 10 supplies the transmission signal also serving as power supply to the communication line 30. The transmission signal includes an address and control data (in the case of the control mode), and the slave device 20 at the address destination operates according to the received control data.

  The slave device 20 is, for example, a wall switch or a relay terminal, and operates by receiving the transmission signal of FIG. 2 transmitted from the master device 10 via the communication line 30. As described above, when the slave device 20 is a wall switch, power is also supplied by this transmission signal. Also, when the slave device 20 is a relay terminal, the connection between the lighting equipment (not shown) and the power supply is turned on / off according to the control data in the received transmission signal.

  The communication line 30 is, for example, a two-wire transmission line, through which the transmission signal as shown in FIG. 2 flows. Specifically, power supply and signal transmission are simultaneously performed from the master device 10 to the slave device 20 (for example, a wall switch) in the voltage mode. A reply is sent from the slave device 20 to the master device 10 in the current mode.

  The inspection device 40 inspects whether there is an erroneous connection between the systems before turning on the power of the lighting system 1 (before operating). For example, an operator may mistakenly connect the A-system communication line 30 and the B-system communication line 30 as shown by the dotted line L during construction of the lighting system 1. If power is applied to the lighting system 1 in this state, the power supplies of both master devices 10 are short-circuited, and the devices at the output part are destroyed or are subjected to electrical stress, resulting in failure after operation. It becomes easy, and as a result, a communication failure occurs.

  Therefore, the inspection apparatus 40 measures the electrical characteristics (for example, AC impedance) of the communication line 30 for the connected system (for example, B system) before turning on the power in the lighting system 1 and outputs the measured value to the measured value. The presence or absence of incorrect connection is checked accordingly.

  Details of such an inspection device 40 will be described with reference to FIG. FIG. 3 is a block diagram illustrating an example of a configuration of the inspection device 40 according to the first embodiment of the present invention. As illustrated, the inspection device 40 includes an input unit 41, a threshold generation unit 42, a measurement unit 43, a determination unit 44, and a display unit 45. Note that the threshold generation unit 42 and the determination unit 44 are realized by, for example, a microcomputer including a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). That is, the functions of the threshold generation unit 42 and the determination unit 44 are realized by the CPU using the RAM as a work memory and appropriately executing various programs stored in the ROM.

  The input unit 41 is, for example, a switch or an operation key, and the user (for example, a worker or an inspector) can input a type (model) of a device (for example, a B-system) connected to the inspection device 40. ) And the number of devices. Note that, instead of the model, the input unit 41 may input information specifying the physical layer such as the RS485 standard. In addition, the input unit 41 may input start information for instructing the start of the examination. In this case, the measuring unit 43 starts measuring the electrical characteristics in response to the input start information. Note that, in response to the input of the device information to the input unit 41, the measuring unit 43 may start measuring the electrical characteristics.

  The threshold generation unit 42 generates a threshold for determining whether there is an erroneous connection according to the device information input from the input unit 41. Specifically, the threshold generation unit 42 previously stores information obtained by measuring the impedances of the devices (the master device 10 and the slave device 20) of each model (for example, the model F and the model M) as illustrated in FIG. are doing. The impedance of each device shown in FIG. 4 is a value measured by flowing an AC signal of 10 KHz as an example. The impedance is not limited to 10 KHz, and the impedance may be measured by generating an AC signal of another frequency. However, in consideration of the influence on the transmission characteristics of the communication line 30, a range of about 1 to 10 KHz is desirable.

  The threshold generator 42 generates a parallel circuit model as shown in FIG. 5 based on the impedance of each device. Specifically, the following formula 1 is used by the threshold generation unit 42 to obtain a combined impedance according to the device information (for example, the model and the number of devices) constituting one system.

Zc = (Zs × Zp / N) / (Zs + (Zp / N)) (Equation 1)
Zc: synthetic impedance Zs: impedance of master device Zp: impedance of slave device N: number of slave devices

  FIG. 6 is a graph showing, as an example, a characteristic of a combined impedance in a system (a normal system and an erroneously connected system) constituted by the devices of the model F. In FIG. 6, a curve C1 shows a change (change according to the number) of the combined impedance in a normal system. The other curves in FIG. 6 show changes in the combined impedance in the erroneously connected system. As shown in the figure, even when the number of vehicles increases to 50, the combined impedance does not fall below 1500Ω and is far from the maximum value of the combined impedance (about 1080Ω) in the erroneously connected system. As a result, in the case of a system composed of devices of the model F, it is possible to determine that there is no erroneous connection if the impedance is 1200Ω or more, regardless of the number of components. Conversely, if the impedance is less than 1200Ω, it can be determined that there is an erroneous connection. Therefore, the threshold generation unit 42 stores 1200Ω as the threshold in association with the model F.

  FIG. 7 is a graph showing, as an example, the characteristics of the combined impedance in a system (a normal system and an erroneously connected system) constituted by the devices of the model M. In FIG. 7, a curve C2 indicates a change in the combined impedance (change according to the number of vehicles) in a normal system. Further, the other curves in FIG. 7 show changes in the combined impedance in the erroneous connection system. As shown in the drawing, the curve C2 requires a threshold value depending on the number of devices, unlike the above-described model F, because the combined impedance falls below the maximum value of the combined impedance in the erroneously connected system when the number of devices increases. Therefore, as shown in FIG. 8, the threshold generation unit 42 obtains a curve C3 (approximate curve) approximating the curve C2, adjusts the offset value of the curve C3, and adjusts the combined impedance of the normal system (that is, the curve C3). A curve C4 between C2) and the combined impedance of the incorrectly connected system is determined in advance. Specifically, the curve C3 is represented by the following equation 2, and the curve C4 is represented by the following equation 3.

Z = 5.92X ² −627.1X + 28248 (Expression 2)
Z = 5.92X ² −627.1X + 25500 (formula 3)
Z: Synthetic impedance X: Number of units

  As a result, in the case of a system composed of the devices of the model M, as an example, if the impedance is equal to or more than the value obtained from Expression 3 (the value obtained by applying the number of devices to Expression 3), there is no erroneous connection. Can be determined. Conversely, if the impedance is less than the value obtained from Equation 3, it can be determined that there is an erroneous connection. Therefore, the threshold generation unit 42 stores Expression 3 in association with the model M in order to generate the threshold.

  The threshold value generation unit 42 storing such a threshold value and Expression 3 is a threshold value for determining the presence or absence of an erroneous connection according to the device information (for example, model and number) input from the input unit 41. Generate For example, when the model F is input from the input unit 41, the threshold generation unit 42 generates 1200Ω as the threshold regardless of the number of units (input of the number may be omitted). In addition, when the model M is input from the input unit 41 and the number of 30 devices is input, the threshold generation unit 42 generates 12060Ω as the threshold from Expression 3.

  Returning to FIG. 3, the measuring unit 43 measures the electrical characteristics of the communication line 30 for the connected system (for example, the B system). The measuring unit 43 includes a signal generating unit 431, a voltage measuring unit 432, and a current measuring unit 433.

  The signal generator 431 generates an AC signal of 10 KHz, for example. The AC signal to be generated is not limited to 10 KHz, but as described above, a range of about 1 to 10 KHz is desirable in consideration of the influence on the transmission characteristics of the communication line 30. The generated AC signal is supplied to the B-system communication line 30 through the terminal T.

  The voltage measuring unit 432 measures the voltage of the communication line 30 while the signal generating unit 431 is generating an AC signal.

  The current measuring unit 433 measures the current of the communication line 30 through the current transformer CT while the signal generating unit 431 is generating an AC signal.

  The measuring unit 43 having such a configuration measures the AC impedance of the communication line 30 from the voltage measured by the voltage measuring unit 432 and the current measured by the current measuring unit 433. When the measurement of the AC impedance is completed in this way, the signal generation unit 431 stops generating the AC signal, and the voltage measurement unit 432 and the current measurement unit 433 end the measurement.

  The determination unit 44 determines whether there is an erroneous connection based on the AC impedance measured by the measurement unit 43 and the threshold value generated by the threshold value generation unit 42. That is, if the measured AC impedance is equal to or greater than the threshold, the determination unit 44 determines that there is no erroneous connection. On the other hand, if the measured AC impedance is less than the threshold, the determination unit 44 determines that there is an erroneous connection.

  The display unit 45 includes, for example, a liquid crystal display device, and displays a determination result by the determination unit 44. That is, the presence or absence of an incorrect connection is displayed. In addition, in the case where a sounding unit including a buzzer and a speaker is provided instead of the display unit 45 or in addition to the display unit 45, a notification sound according to the determination result by the determination unit 44 may be output. Good.

  Hereinafter, the operation of the inspection apparatus 40 having such a configuration will be described with reference to FIG. FIG. 9 is a flowchart illustrating an example of the inspection process according to the first embodiment of the present invention. This inspection process is started before the power to the lighting system 1 is turned on.

  First, the inspection device 40 acquires device information according to a user's input operation (step S101). That is, the input unit 41 inputs device information such as the type (model) and the number of devices constituting a system (for example, B system) connected to the inspection device 40 in accordance with the operation of the switch or the operation key by the user.

  The inspection device 40 generates a threshold (Step S102). That is, the threshold generation unit 42 generates a threshold for determining the presence or absence of an erroneous connection according to the device information (for example, model and number) input from the input unit 41. For example, when the model F is input from the input unit 41, the threshold generation unit 42 generates 1200Ω as the threshold regardless of the number of units (input of the number may be omitted). In addition, when the model M is input from the input unit 41 and the number of thirty units is input, the threshold generation unit 42 generates 12060Ω as the threshold from Expression 3 described above.

  The inspection device 40 outputs a small-amplitude AC signal (Step S103). That is, the signal generator 431 generates an AC signal of 10 KHz and supplies the signal to the B-system communication line 30 as an example.

  The inspection device 40 performs impedance measurement (Step S104). That is, while the signal generation unit 431 is generating an AC signal, the voltage measurement unit 432 measures the voltage of the communication line 30, and the current measurement unit 433 detects the voltage of the communication line 30 through the current transformer CT. Measure the current. Then, the measuring unit 43 measures the AC impedance of the communication line 30 from the measured voltage and current.

  The inspection device 40 determines whether there is an erroneous connection according to the measured impedance (step S105). That is, the determination unit 44 determines whether there is an erroneous connection based on the AC impedance measured by the measurement unit 43 and the threshold value generated by the threshold value generation unit 42. That is, if the measured AC impedance is equal to or greater than the threshold, the determination unit 44 determines that there is no erroneous connection. On the other hand, if the measured AC impedance is less than the threshold, the determination unit 44 determines that there is an erroneous connection.

  The inspection device 40 displays the determination result (Step S106). That is, the display unit 45 displays the determination result by the determination unit 44. That is, the presence or absence of an incorrect connection is displayed.

  By such an inspection process, the AC impedance of the communication line 30 in the system (for example, the B system) to which the inspection device 40 is connected is measured in a state where the power to the lighting system 1 is not turned on. Based on the threshold and the threshold corresponding to the device information, it is determined whether there is an erroneous connection between the systems. As a result, it is possible to appropriately inspect whether there is an erroneous connection before operation.

  In the first embodiment described above, the case where the presence / absence of erroneous connection is inspected by using the external inspection device 40 is described. However, the function of the inspection device 40 is built in the master The presence or absence of connection may be checked. Hereinafter, the lighting system 2 according to the second embodiment of the present invention will be described.

(Embodiment 2)
FIG. 10 is a schematic diagram illustrating an example of an overall configuration of a lighting system 2 according to Embodiment 2 of the present invention. This lighting system 2 is also divided into a plurality of systems (for example, A system and B system) as in the first embodiment, and one master device 50 and a plurality of slave devices 20 are connected to each other by a communication line. 30 are connected. Note that the slave device 20 and the communication line 30 are the same as in the first embodiment.

  Also, as in the first embodiment, the A-system communication line 30 and the B-system communication line 30 should be operated in an electrically disconnected state. May be erroneously connected (erroneous wiring). Also, as in the first embodiment, although omitted in FIG. 10, it is assumed that lighting devices are connected to some slave devices 20 (for example, relay terminals).

  The master device 50 is, for example, a central control device, and controls the slave device 20 via the communication line 30. The master device 50 has the functions of the inspection device 40 according to the first embodiment.

  Details of such a master device 50 will be described with reference to FIG. FIG. 11 is a block diagram illustrating an example of a configuration of the master device 50 according to the second embodiment of the present invention. As shown in the figure, the master device 50 includes, in addition to the control unit 51 and the communication processing unit 52, an input unit 41, a threshold generation unit 42, a measurement unit 43, a determination unit 44, and a display unit 45. Prepare. The input unit 41 to the display unit 45 have the same configuration as the inspection device 40 according to the first embodiment.

  The control unit 51 controls the entire master device 50. For example, before operating the communication processing unit 52, the control unit 51 operates the measurement unit 43 and the determination unit 44 to check whether there is an erroneous connection. When it is determined that there is an erroneous connection, the control unit 51 does not operate the communication processing unit 52.

  The communication processing unit 52 is controlled by the control unit 51 to transmit the transmission signal as shown in FIG. 2 to the communication line 30 and to supply power and signal transmission to the slave device 20 (for example, a wall switch). Perform at the same time. The communication processing unit 52 operates only when the measurement unit 43 and the determination unit 44 determine that there is no erroneous connection.

  Hereinafter, the operation of the master device 50 having such a configuration will be described with reference to FIG. FIG. 12 is a flowchart illustrating an example of a preliminary inspection process according to the second embodiment of the present invention. This preliminary inspection process is started, for example, when the power to the master device 50 is turned on. It is assumed that device information has been input to the input unit 41 in advance by a user.

  First, the master device 50 waits for the elapse of a random time (step S201). That is, the control unit 51 generates a random time for securing a time difference from the other master devices 50, and waits until the random time elapses.

  After waiting for the random time, the master device 50 outputs a small-amplitude AC signal (step S202). That is, the signal generator 431 generates an AC signal of 10 KHz and supplies the signal to the B-system communication line 30 as an example.

  Master device 50 performs impedance measurement (step S203). That is, while the signal generation unit 431 is generating an AC signal, the voltage measurement unit 432 measures the voltage of the communication line 30, and the current measurement unit 433 detects the voltage of the communication line 30 through the current transformer CT. Measure the current. Then, the measuring unit 43 measures the AC impedance of the communication line 30 from the measured voltage and current.

  Master device 50 determines whether or not the measured impedance is equal to or greater than a threshold (step S204). That is, the threshold generation unit 42 generates a threshold for determining whether there is an erroneous connection according to the device information (for example, model and number) input from the input unit 41, and the determination unit 44 It is determined whether or not the AC impedance measured by the measuring unit 43 is equal to or greater than the threshold.

  When determining that the measured impedance is equal to or greater than the threshold (step S204; Yes), the master device 50 displays a normal message (step S205). That is, the display unit 45 displays a normal message indicating that there is no incorrect connection. Then, the master device 50 normally ends the preliminary inspection and starts communication with the slave device 20. That is, the control unit 51 operates the communication processing unit 52 to transmit the transmission signal as shown in FIG.

  On the other hand, when it is determined that the measured impedance is not equal to or larger than the threshold (less than the threshold) (Step S204; No), the master device 50 displays an alert message (Step S206). That is, the display unit 45 displays an alert message indicating that there is an erroneous connection. Then, the master device 50 abnormally ends the preliminary inspection, and stops the operation as it is. That is, the control unit 51 stops the processing without operating the communication processing unit 52.

  By such a preliminary inspection process, before the lighting system 2 actually operates, the AC impedance of the communication line 30 is measured, and based on the AC impedance and a threshold value according to the device information, erroneous connection between the systems is performed. The presence or absence is determined. As a result, it is possible to appropriately inspect whether there is an erroneous connection before operation.

(Other embodiments)
In the first and second embodiments, only the presence / absence of erroneous connection is checked. However, if there is erroneous connection, the distance to the location may be obtained. For example, when determining that there is an erroneous connection, the determination unit 44 obtains the distance to the erroneous connection using a TDR (Time Domain Refrectometer) technique.

  Specifically, the measuring unit 43 applies a high-speed pulse signal to the communication line 30 from the signal generating unit 431, and measures the time of the returned reflected waveform to obtain the distance to the erroneous connection.

  Then, the display unit 45 displays the determination result and the distance to the location of the incorrect connection (when there is an incorrect connection).

  As described above, when the distance to the location of the erroneous connection is displayed, the user can easily eliminate the erroneous connection.

  In the above embodiment, the lighting systems 1 and 2 have been described as specific examples of the control system. However, the present invention can be applied to other control systems as appropriate. For example, the present invention is similarly applicable to an air conditioning system or a ventilation system including a master device 10 and a plurality of slave devices 20.

  In the above embodiment, the programs executed by the microcomputer that realizes the threshold value generation unit 42 and the determination unit 44 include a compact disc read only memory (CD-ROM), a digital versatile disc (DVD), and a magneto-optical (MO). Disk), a USB memory, a memory card, and other computer-readable recording media. Then, by installing such a program on a specific or general-purpose computer, it is possible to cause the computer to function as the threshold generation unit 42 or the determination unit 44 in the above embodiment.

  Further, the program may be stored in a disk device of a server device on a communication network such as the Internet, and may be superimposed on a carrier wave and downloaded to a computer. The above-described processing can also be achieved by starting and executing the program while transferring the program via the communication network. Furthermore, the above-described processing can also be achieved by executing all or a part of the program on the server device and executing the program while the computer transmits and receives information regarding the processing via a communication network.

  In the case where the above functions are realized by sharing an OS (Operating System) or when the OS and an application cooperate with each other, only parts other than the OS are stored in the recording medium and distributed. Or downloaded to a computer.

  The present invention is capable of various embodiments and modifications without departing from the broad spirit and scope. Further, the above-described embodiment is for describing the present invention, and does not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiment but by the claims. Various modifications made within the scope of the claims and equivalents thereof are considered to be within the scope of the present invention.

  INDUSTRIAL APPLICATION This invention can be employ | adopted suitably for the test | inspection apparatus, control system, and test | inspection method which can test properly whether there is an incorrect connection before operation.

  1, 2 lighting system, 10, 50 master device, 20 slave device, 30 communication line, 40 inspection device, 41 input unit, 42 threshold generation unit, 43 measurement unit, 431 signal generation unit, 432 voltage measurement unit, 433 current measurement Unit, 44 determination unit, 45 display unit, 51 control unit, 52 communication processing unit

Claims (7)

An inspection device in a control system to be operated in a state where the first system and the second system are electrically disconnected,
A master device and a slave device are connected to the first and second systems via communication lines, respectively, and when the power is turned on, the master device supplies a transmission signal also serving as power supply to the communication line, The slave device operates by receiving the transmission signal through the communication line,
A measurement unit that measures electrical characteristics of the communication line in the first system in a state where power is not supplied to the control system;
Based on the electrical characteristics and a threshold determined according to the configuration of the master device and the slave device in the first system, the presence or absence of an erroneous connection between the first system and the second system is displayed. A display unit,
An inspection device comprising: An inspection device in a control system to be operated in a state where the first system and the second system are electrically disconnected,
A master device and a slave device are connected to the first and second systems via communication lines, respectively, and when the power is turned on, the master device supplies a transmission signal also serving as power supply to the communication line, The slave device operates by receiving the transmission signal through the communication line,
A measurement unit that measures electrical characteristics of the communication line in the first system in a state where power is not supplied to the control system;
Based on the electrical characteristics and a threshold determined according to the configuration of the master device and the slave device in the first system, it is determined whether there is an erroneous connection between the first system and the second system. a determination unit,
A display unit that displays the determination result of the previous SL judgment unit,
An inspection device comprising: An inspection device in a control system to be operated in a state where the first system and the second system are electrically disconnected,
A master device and a slave device are connected to the first and second systems via communication lines, respectively, and when the power is turned on, the master device supplies a transmission signal also serving as power supply to the communication line, The slave device operates by receiving the transmission signal through the communication line,
A measurement unit that measures electrical characteristics of the communication line in the first system in a state where power is not supplied to the control system;
An input unit for inputting device information regarding a configuration of the master device and the slave device in the first system;
According to the device information, a threshold generation unit that generates a threshold,
And the electrical characteristics, and the based on the threshold value, the determination unit and the first system the presence or absence of erroneous connection between the second system,
A display unit that displays the determination result of the previous SL judgment unit,
An inspection device comprising: The measurement unit is
A signal generator that generates an AC signal and supplies the signal to the communication line of the first system;
A voltage measurement unit that measures the voltage of the communication line in a state where the AC signal is being supplied,
A current measurement unit that measures the current of the communication line in a state where the AC signal is supplied,
Based on the voltage and the current, measure the AC impedance of the communication line,
The inspection device according to claim 1. The signal generator generates the AC signal in a range of 1 kHz to 10 kHz,
The inspection device according to claim 4. A control system to be operated in a state where the first system and the second system are electrically disconnected,
A master device and a slave device are connected to the first and second systems via communication lines, respectively, and when the power is turned on, the master device supplies a transmission signal also serving as power supply to the communication line, The slave device operates by receiving the transmission signal through the communication line,
A measurement unit that measures an electrical characteristic of the communication line in the first system in a state where power is not supplied to the control system;
Based on the electrical characteristics and a threshold determined according to the configuration of the master device and the slave device in the first system, the presence or absence of an erroneous connection between the first system and the second system is displayed. A display unit;
Control system. An inspection method in a control system to be operated in a state where a first system and a second system are electrically disconnected,
A master device and a slave device are connected to the first and second systems via communication lines, respectively, and when the power is turned on, the master device supplies a transmission signal also serving as power supply to the communication line, The slave device operates by receiving the transmission signal through the communication line,
A measurement step of measuring electrical characteristics of the communication line in the first system in a state where power is not supplied to the control system;
Based on the electrical characteristics and a threshold determined according to the configuration of the master device and the slave device in the first system, it is determined whether there is an erroneous connection between the first system and the second system. A determining step;
An inspection method comprising:

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