WO2018078790A1

WO2018078790A1 - Inspection device, control system, and inspection method

Info

Publication number: WO2018078790A1
Application number: PCT/JP2016/082040
Authority: WO
Inventors: 利康樋熊; 幹滋水野
Original assignee: 三菱電機株式会社
Priority date: 2016-10-28
Filing date: 2016-10-28
Publication date: 2018-05-03
Also published as: JP6641502B2; JPWO2018078790A1

Abstract

An input unit (41) inputs machine information (e.g., type of machine or number of machines) for machines constituting a system to be inspected. A threshold value generation unit (42) generates, in accordance with the machine information inputted by the input unit (41), a threshold value for determining whether there is an improper connection. A measurement unit (43) measures the electrical characteristics (e.g., AC impedance) of a communication line in the system to be inspected, in a state in which no power is supplied to an illumination system. A determination unit (44) determines, on the basis of the electrical characteristics measured by the measurement unit (43) and the threshold value generated by the threshold value generation unit (42), whether there is an improper connection between systems. A display unit (45) displays the determination result from the determination unit (44).

Description

Inspection device, control system, and inspection method

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

Conventionally, various control systems have been introduced in buildings such as buildings and factories. For example, in an illumination system (illumination control system), a master device (as an example, a central control device) and a slave device (as an 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 this transmission signal through the communication line. In general, there are a plurality of systems in an illumination system, and one system is composed of one master device and a plurality of slave devices. Different systems operate in an electrically disconnected state.

In such a lighting system, for example, an operator may mistakenly connect the systems during construction. If the lighting system is turned on in this state, the power supply of both master devices will be short-circuited, the device in the output part will be destroyed, or it will be susceptible to failure after operation due to electrical stress, As a result, communication failure occurs.

In addition, as a prior art for dealing with erroneous connection (incorrect connection), Patent Document 1 discloses an invention of a circuit breaker inserted in a power supply path between a DC power source and a load.

Japanese Patent No. 5043642

The invention of Patent Document 1 is intended for short circuit protection due to erroneous connection, and an erroneous connection is detected after operation (energization).

However, since a large number of devices are connected in a control system represented by a lighting system, there is a concern that the cost may be significantly increased if a device corresponding to a circuit breaker or an erroneous connection detector is incorporated in each device. Is done. In addition, in the control system, there is a case where power is not supplied to the entire building at the time of construction, and a technique capable of inspecting whether or not there is a misconnection before the operation has been demanded.

The present invention has been made to solve the above-described problems, and provides an inspection apparatus, a control system, and an inspection method capable of appropriately inspecting whether or not there is a misconnection before operation. With the goal.

In order to achieve the above object, an inspection apparatus according to the present invention comprises:
An inspection apparatus in a control system that should operate in a state where the first system and the second system are electrically disconnected from each other,
A master device and a slave device are connected to each of the first and second systems via a communication line, and when the power is turned on, the master device supplies a transmission signal that also serves 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 the power is not turned on to the control system;
In accordance with the electrical characteristics, a display unit that displays presence / absence of erroneous connection between the first system and the second system;
Is provided.

In the inspection apparatus according to the present invention, the electrical characteristic (for example, AC impedance) of the communication line in the first system is measured in a state where the power is not turned on to the control system, and the first characteristic is determined according to the electrical characteristic. Whether or not there is a misconnection between the second system and the second system is displayed. As a result, it is possible to appropriately inspect for erroneous connection before operation.

The schematic diagram which shows an example of the whole structure of the illumination system which concerns on Embodiment 1 of this invention. Schematic diagram for explaining an example of a transmission signal in a communication line 1 is a block diagram illustrating an example of a configuration of an inspection apparatus according to a first embodiment. Graph showing the difference in input impedance of each device Schematic diagram for explaining the parallel circuit model for determining the composite impedance A graph showing the characteristics of the combined impedance in systems composed of model F equipment (normal systems and misconnected systems) A graph showing the characteristics of the combined impedance in a system composed of devices of model M (normal system and erroneous connection system) A graph for explaining a threshold in a system composed of devices of model M The flowchart for demonstrating the inspection process which concerns on Embodiment 1 of this invention. The schematic diagram which shows an example of the whole structure of the illumination system which concerns on Embodiment 2 of this invention. The block diagram which shows an example of a structure of the inspection apparatus which concerns on Embodiment 2. The flowchart for demonstrating the preliminary inspection process which concerns on Embodiment 2 of this 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. In the following, a case where the present invention is applied to a lighting system (lighting control system) will be described as a specific example of the control system. However, as will be described later, the present invention can be similarly applied to other control systems. it can. That is, the embodiment described below is for explanation, and does not limit the scope of the present invention. Therefore, those skilled in the art can employ embodiments in which each or all of these elements are replaced with equivalent ones, and these embodiments are also included in the scope of the present invention.

(Embodiment 1)
FIG. 1 is a schematic diagram illustrating an example of the overall configuration of a lighting system 1 according to Embodiment 1 of the present invention. This 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. Yes. 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, but as shown by the dotted line L, the systems are misconnected (incorrect wiring). It can happen.

Further, although omitted in FIG. 1, it is assumed that lighting devices are connected to some slave devices 20 (relay terminals as an example).

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 a voltage mode of ± 24V. That is, the master device 10 supplies a transmission signal that also serves as power supply to the communication line 30. The transmission signal includes an address and control data (in 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 sent from the master device 10 via the communication line 30. As described above, when the slave device 20 is a wall switch, power is supplied by this transmission signal. Further, when the slave device 20 is a relay terminal, the connection between a lighting device (not shown) and a power source 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, and a transmission signal as shown in FIG. 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. In addition, a reply is made 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 systems before the lighting system 1 is turned on (before operation). For example, an operator may mistakenly connect the A-system communication line 30 and the B-system communication line 30 as indicated by a dotted line L during construction of the lighting system 1. If the lighting system 1 is turned on in this state, the power supply of both master devices 10 is short-circuited, and the device in the output part is destroyed or is subjected to electrical stress and fails after operation. As a result, 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, the B system) before turning on the power in the illumination system 1, and uses the measured value as the measured value. Check for incorrect connections accordingly.

Details of such an inspection apparatus 40 will be described with reference to FIG. FIG. 3 is a block diagram showing an example of the configuration of the inspection apparatus 40 according to Embodiment 1 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 types of devices (models) that configure a system (for example, system B) connected to the inspection apparatus 40 by a user (for example, an operator or an inspector). ) And device information such as the number of devices. Instead of the model, the input unit 41 may input information that defines the physical layer, such as the RS485 standard. In addition, the input unit 41 may input start information for instructing the start of the inspection. In this case, in response to the input start information, the measurement unit 43 starts measuring electrical characteristics. In response to the device information being input to the input unit 41, the measurement unit 43 may start measuring the electrical characteristics.

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

The threshold generation unit 42 generates a parallel circuit model as shown in FIG. 5 based on the impedance of each device. Specifically, the threshold value generation unit 42 obtains a composite impedance according to device information (for example, model and number of units) constituting one system by the following Expression 1.

Zc = (Zs × Zp / N) / (Zs + (Zp / N)) (Formula 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, the characteristics of the synthetic impedance in a system (a normal system and an erroneous connection system) composed of model F equipment. In FIG. 6, a curve C <b> 1 indicates a change in synthetic impedance (change according to the number) in a normal system. Further, other curves in FIG. 6 indicate changes in the combined impedance in the erroneous connection system. As shown in the figure, the curve C1 is far from the maximum value (about 1080Ω) of the combined impedance in the erroneous connection system, even if the number increases to 50, the combined impedance does not fall below 1500Ω. Thereby, in the case of a system composed of devices of model F, as an example, if the impedance is 1200Ω or more, it can be determined that there is no erroneous connection, regardless of the number of components. Conversely, if the impedance is less than 1200Ω, it can be determined that there is an incorrect connection. Therefore, the threshold value generation unit 42 stores 1200Ω as a threshold value in association with the model F.

FIG. 7 is a graph showing the characteristics of the composite impedance in a system (a normal system and an erroneous connection system) composed of model M devices as an example. In FIG. 7, a curve C <b> 2 indicates a change in synthetic impedance (change according to the number) in a normal system. Further, the other curves in FIG. 7 indicate changes in the combined impedance in the erroneous connection system. As shown in the figure, when the number of curves C2 increases, the combined impedance falls below the maximum value of the combined impedance in the erroneously connected system. Therefore, unlike the model F, a threshold value depending on the number is required. Therefore, as shown in FIG. 8, the threshold value generator 42 obtains a curve C3 (approximate curve) that approximates the curve C2, adjusts the offset value of the curve C3, and thus combines the normal system impedance (that is, the curve). A curve C4 between C2) and the combined impedance of the misconnected system is obtained. Specifically, the curve C3 is represented by the following formula 2, and the curve C4 is represented by the following formula 3.

Z = 5.92X ² -627.1X + 28248 (Expression 2)
Z = 5.92X ² -627.1X + 25500 (Formula 3)
Z: Composite impedance X: Number of units

Thereby, in the case of a system composed of devices of model M, as an example, if the impedance is equal to or greater than the value obtained from Equation 3 (the value obtained by applying the number to Equation 3), there is no erroneous connection. Can be determined. On the contrary, 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 value generation unit 42 stores Equation 3 in association with the model M in order to generate a threshold value.

The threshold value generating unit 42 that stores the threshold values and Equation 3 as described above is a threshold value for determining the presence / absence of an erroneous connection according to the device information (for example, the model and the number of units) input from the input unit 41. Is generated. For example, when the model F is input from the input unit 41, the threshold value generation unit 42 generates 1200Ω as the threshold value regardless of the number (the input of the number may be omitted). In addition, when the model M is input from the

input unit

41 and 30 units are input, the threshold value generation unit 42 generates 12060Ω as the threshold value from Equation 3.

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

The signal generator 431 generates an AC signal of 10 KHz as an example. The AC signal to be generated is not limited to 10 KHz, but as described above, the 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 measurement unit 432 measures the voltage of the communication line 30 in a state where the signal generation unit 431 generates an AC signal.

The current measuring unit 433 measures the current of the communication line 30 through the current transformer CT in a state where the signal generating unit 431 generates an AC signal.

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

The determination unit 44 determines whether or not there is a misconnection 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 value, 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 value, the determination unit 44 determines that there is an erroneous connection.

The display unit 45 includes a liquid crystal display device as an example, and displays a determination result by the determination unit 44. That is, the presence / absence of erroneous connection is displayed. It should be noted that instead of the display unit 45 or in addition to the display unit 45, when a sound generation unit including a buzzer or a speaker is provided, a notification sound corresponding 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 lighting system 1 is powered on.

First, the inspection device 40 acquires device information in accordance with a user 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, the B system) connected to the inspection apparatus 40 in accordance with a user's operation of switches and operation keys.

The inspection device 40 generates a threshold value (step S102). That is, the threshold value generation unit 42 generates a threshold value for determining the presence or absence of an erroneous connection according to the device information (for example, the model or the number of units) input from the input unit 41. For example, when the model F is input from the input unit 41, the threshold value generation unit 42 generates 1200Ω as the threshold value regardless of the number (the 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 units is input, the threshold value generation unit 42 generates 12060Ω as the threshold value from Equation 3 described above.

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

The inspection apparatus 40 performs impedance measurement (step S104). That is, in the state where the signal generation unit 431 generates an AC signal, the voltage measurement unit 432 measures the voltage of the communication line 30, and the current measurement unit 433 transmits the current of the communication line 30 through the current transformer CT. Measure current. And the measurement part 43 measures the alternating current impedance of the communication line 30 from the measured voltage and electric current.

The inspection device 40 determines whether or not there is a misconnection according to the measured impedance (step S105). That is, the determination unit 44 determines whether or not there is a misconnection 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 value, 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 value, 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 / absence of erroneous 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 apparatus 40 is connected is measured in a state where the lighting system 1 is not turned on. And whether there is an erroneous connection between the systems is determined based on the threshold value corresponding to the device information. As a result, it is possible to appropriately inspect for erroneous connection before operation.

In the first embodiment described above, the case of inspecting the presence / absence of an incorrect connection using the external inspection device 40 has been described. However, the function of such an inspection device 40 is incorporated in the master device 10 and erroneously detected. You may make it test | inspect for the presence or absence of a connection. Hereinafter, the illumination system 2 according to Embodiment 2 of the present invention will be described.

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

Similarly to 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 (incorrect wiring). As in the first embodiment, although omitted in FIG. 10, it is assumed that lighting devices are connected to some slave devices 20 (relay terminals as an example).

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 incorporates the function of the inspection device 40 in the first embodiment.

Details of the master device 50 will be described with reference to FIG. FIG. 11 is a block diagram showing an example of the configuration of the master device 50 according to the second embodiment of the present invention. As illustrated, the master device 50 includes an input unit 41, a threshold generation unit 42, a measurement unit 43, a determination unit 44, and a display unit 45 in addition to the control unit 51 and the communication processing unit 52. Prepare. These input unit 41 to display unit 45 have the same configuration as the inspection apparatus 40 in 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 inspect 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 and transmits the transmission signal as shown in FIG. 2 to the communication line 30 to supply power to the slave device 20 (for example, a wall switch) and signal transmission. Do it at the same time. Note that the communication processing unit 52 operates only when the measurement unit 43 or the determination unit 44 determines 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 pre-inspection process is started, for example, when the master device 50 is powered on. It is assumed that device information is input to the input unit 41 in advance by the user.

First, the master device 50 waits for a random time to elapse (step S201). That is, the control part 51 produces | generates the random time for ensuring the time difference with the other master apparatus 50, and waits until this random time passes.

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

The master device 50 performs impedance measurement (step S203). That is, in the state where the signal generation unit 431 generates an AC signal, the voltage measurement unit 432 measures the voltage of the communication line 30, and the current measurement unit 433 transmits the current of the communication line 30 through the current transformer CT. Measure current. And the measurement part 43 measures the alternating current impedance of the communication line 30 from the measured voltage and electric current.

The master device 50 determines whether or not the measured impedance is greater than or equal to a threshold value (step S204). 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, the model or the number of units) input from the input unit 41. The determination unit 44 It is determined whether or not the AC impedance measured by the measurement unit 43 is equal to or greater than this threshold value.

When the master device 50 determines that the measured impedance is greater than or equal to the threshold (step S204; Yes), it displays a normal message (step S205). That is, the display unit 45 displays a normal message indicating that there is no erroneous connection. Then, the master device 50 ends the preliminary inspection normally, 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 higher 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 ends the preliminary inspection abnormally 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 pre-inspection processing, the AC impedance of the communication line 30 is measured before the lighting system 2 is actually operated, and based on the AC impedance and the threshold value corresponding to the device information, the erroneous connection between the systems is measured. Presence / absence is determined. As a result, it is possible to appropriately inspect for erroneous connection before operation.

(Other embodiments)
In the first and second embodiments, the presence / absence of an erroneous connection has been examined. However, if there is an 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 by a TDR (Time Domain Refrectometer) technique.

Specifically, the measurement unit 43 applies a high-speed pulse signal from the signal generation unit 431 to the communication line 30 and measures the time of the reflected waveform that is returned, thereby obtaining the distance to the erroneous connection location.

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

Thus, 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, but the present invention can be applied to other control systems as appropriate. For example, the present invention can be similarly applied to an air conditioning system or a ventilation system including the master device 10 and a plurality of slave devices 20.

In the above-described embodiment, the programs executed by the microcomputer that implements the threshold generation unit 42 and the determination unit 44 are CD-ROM (Compact / Disc / Read / Only / Memory), DVD (Digital / Versatile / Disc), MO (Magneto-Optical). Disk), USB memory, memory card, etc. can also be stored and distributed in a computer-readable recording medium. 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 value generation unit 42 or the determination unit 44 in the above-described embodiment.

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

Note that when the above functions are realized by sharing an OS (Operating System) or when the functions are realized by cooperation between the OS and an application, only the part other than the OS is stored in the recording medium and distributed. It may also be downloaded to a computer.

The present invention can be variously modified and modified without departing from the spirit and scope of the broad sense. Further, the above-described embodiment is for explaining 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 embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

The present invention can be suitably employed in an inspection apparatus, a control system, and an inspection method capable of appropriately inspecting whether or not there is a misconnection 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

An inspection apparatus in a control system that should operate in a state where the first system and the second system are electrically disconnected from each other,
A master device and a slave device are connected to each of the first and second systems via a communication line, and when the power is turned on, the master device supplies a transmission signal that also serves 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 the power is not turned on to the control system;
In accordance with the electrical characteristics, a display unit that displays presence / absence of erroneous connection between the first system and the second system;
An inspection apparatus comprising:
Based on the electrical characteristics and a threshold value determined according to the configuration of the master device and the slave device in the first system, it is determined whether or not there is an erroneous connection between the first system and the second system. A determination unit;
The display unit displays a determination result of the determination unit.
The inspection apparatus according to claim 1.
An input unit for inputting device information related to configurations of the master device and the slave device in the first system;
A threshold generation unit that generates a threshold according to the device information;
A determination unit for determining whether or not there is an erroneous connection between the first system and the second system based on the electrical characteristics and the threshold;
The display unit displays a determination result of the determination unit.
The inspection apparatus according to claim 1.
The measuring unit is
A signal generator that generates an alternating current signal and supplies the alternating current signal to the communication line of the first system;
A voltage measuring unit for measuring a voltage of the communication line in a state where the AC signal is supplied;
A current measuring unit that measures a current of the communication line in a state in which the AC signal is supplied,
Based on the voltage and the current, the AC impedance of the communication line is measured.
The inspection apparatus according to claim 1.
The signal generator generates the AC signal in a range of 1 kHz to 10 kHz;
The inspection apparatus according to claim 4.
A control system that should operate in a state where the first system and the second system are electrically disconnected,
A master device and a slave device are connected to each of the first and second systems via a communication line, and when the power is turned on, the master device supplies a transmission signal that also serves as power supply to the communication line, The slave device operates by receiving the transmission signal through the communication line,
The master device is a measurement unit that measures electrical characteristics of the communication line in the first system in a state where the control system is not powered on;
A display unit that displays the presence or absence of erroneous connection between the first system and the second system according to the electrical characteristics;
Control system.
An inspection method in a control system that should operate in a state where the first system and the second system are electrically disconnected,
A master device and a slave device are connected to each of the first and second systems via a communication line, and when the power is turned on, the master device supplies a transmission signal that also serves 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 the control system is not powered on;
Based on the electrical characteristics and a threshold value determined according to the configuration of the master device and the slave device in the first system, it is determined whether or not there is an erroneous connection between the first system and the second system. A determination step;
An inspection method comprising: