Control system

Abstract

To obtain a control system in which error wiring of a communication line can be detected.SOLUTION: A control system according to a present disclosure, comprises: a controller; system equipment which is constituted in such a manner that it is communicated to the controller with a communication line in a multiplex transmission system, and to which a power is supplied from the controller via the communication line; and an amplifier. At least one of the controller and the amplifier, includes a first current detection portion constituted in such a manner that it detects current by a short circuit of the communication line; a second current detection portion constituted in such a manner that it detects an incoming signal to the controller from the system equipment; and a control portion which is constituted in such a manner that it detects the short circuit of the communication line on the basis of a detection result of the first current detection portion, and detects an error connection of an output of the controller and the amplifier, the error connection of both outputs of the controller, or the error connection of both outputs of the amplifier on the basis of the detection result of the second current detection portion.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a control system.

Background Art

[0002] Patent Document 1 discloses a remote monitoring and control system. In this system, a multiplex transmission switch terminal unit and a relay terminal unit are connected via signal lines. The multiplex transmission switch terminal unit and the relay terminal unit are each assigned an identification ID that uniquely identifies them. Also, corresponding to the assigned identification ID, type information indicating the type of the multiplex transmission switch terminal unit and the relay terminal unit, and connection status information indicating the connection status of the multiplex transmission switch terminal unit and the relay terminal unit in the remote monitoring and control system are assigned. The assigned type information and connection status information are presented for each identification ID.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, as shown in Patent Document 1, there is a system in which system devices are connected to a lighting controller via communication lines. The system devices include input terminal units, output terminal units, wall switches, amplifiers, etc. In such a system, in the wiring work when installing the system devices, miswirings such as the interconnection, ground fault, and short - circuit between the communication lines of the lighting controller and the communication lines of the amplifier may occur. As a result, the system devices may malfunction or stop operating, and the system may stop. However, in the conventional system, there was a possibility that sufficient detection of miswirings, particularly the interconnection between the communication lines of the lighting controller and the communication lines of the amplifier, could not be achieved.

[0005] An object of the present disclosure is to obtain a control system capable of detecting miswiring of a communication line.

Means for Solving the Problems

[0006] In the control system according to the present disclosure, a controller, a system device connected to the controller via a communication line and communicating in a multiplex transmission system, and configured to be powered from the controller via the communication line, and an amplifier connected to the communication line are provided. At least one of the controller and the amplifier includes a first current detection unit configured to detect a current due to a short circuit of the communication line, a second current detection unit configured to detect an upstream signal from the system device to the controller, and a short circuit of the communication line is detected from the detection result of the first current detection unit, and from the detection result of the second current detection unit, a misconnection between the output of the controller and the output of the amplifier, a misconnection between the outputs of the controllers, or a misconnection between the outputs of the amplifiers is detected. It has a configured control unit.

Effects of the Invention

[0007] According to the control system according to the present disclosure, miswiring such as a short circuit and a misconnection of a communication line can be detected by the first current detection unit and the second current detection unit.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6A

Figure 6B

Figure 6C

Figure 7

Figure 8A

Figure 8B

Figure 8C

Figure 8D

Figure 8E

Figure 8F

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0009] The control system according to the present embodiment will be described with reference to the drawings. The same or corresponding components may be denoted by the same reference numerals, and the repeated description may be omitted.

[0010] Embodiment 1. FIG. 1 is a diagram showing the configuration of an illumination control system 1000 according to Embodiment 1. The illumination control system 1000 includes an illumination controller 1, a system device 17 connected to the illumination controller 1 by a pair of communication lines 16, and at least one amplifier 2 connected to the pair of communication lines 16. The illumination controller 1 supplies power, for example, ±24V, to the system device 17 through the communication line 16, and superimposes a control signal on the communication line 16. That is, the system device 17 is configured to communicate with the illumination controller 1 in a multiplex transmission system and to be powered from the illumination controller 1 via the communication line 16.

[0011] The current capacity of the power supply of the illumination controller 1 is, for example, 500 mA. When the number of connected system devices 17 exceeds the current capacity, the amplifiers 2 are connected in parallel, and the system devices 17 are connected to the amplifiers 2. Also, the maximum wiring length of the communication line 16 of the illumination controller 1 is, for example, 500 m. When the installation location of the system device 17 is far away, up to five amplifiers 2 can be connected in series. Thus, when the power supply capacity of the illumination controller 1 is insufficient or the communication distance is insufficient, the amplifiers 2 can be connected in parallel or in series.

[0012] The system configuration in FIG. 1 is an example. The number of systems, the number of series and parallel connections of the amplifiers 2, the number and types of the system devices 17, and the length of the communication line 16 differ for each building and facility. In the example of FIG. 1, amplifiers 2-1 and 2-2 are connected in parallel to the illumination controller 1. Also, an image sensor 3, an illuminance sensor 4, a human presence sensor 5-1, and a dimming controller 6-1 are connected to the illumination controller 1. Further, a plurality of lighting fixtures 9-1 to 9-3 are connected to the dimming controller 6-1 via a dimming signal line 7. Thereby, the lighting fixtures 9-1 to 9-3 can be dimmed and controlled.

[0013] The amplifier 2-1 is connected to the control terminals 8-1, 8-2, the relay terminal 10, and the wall switch 12. The control terminal 8-1 is built into the lighting fixture 9-4 and controls one lighting fixture 9-4. The control terminal 8-2 is built into the lighting fixture 9-5 and controls one lighting fixture 9-5. The relay terminal 10 controls a plurality of lighting fixtures 9-6 to 9-7 connected to the remote control relay 11. The wall switch 12 operates the lighting fixtures 9-1 to 9-n.

[0014] The amplifier 2-2 is connected to the human sensors 5-2, 5-3 and the dimming controller 6-2. A plurality of lighting fixtures 9-8 to 9-9 are connected to the dimming controller 6-2 via the dimming signal line 7. Thereby, the lighting fixtures 9-8 to 9-9 can be dimmed and controlled. The amplifier 2-3 is connected to the control terminal 8-n built into the lighting fixture 9-n to control one lighting fixture 9-n.

[0015] The lighting controller 1 is connected to the lighting monitoring device 15 via the LAN (Local Area Network) 14. The lighting monitoring device 15 has a function of operating and monitoring the system device 17 in a table format or a map format, although not shown in the figure. Further, the lighting monitoring device 15 has a schedule function of operating and setting the system device 17 at a preset time, a function of setting various operation information of the system device 17, and a display screen.

[0016] The lighting control system 1000 includes an infrared setter 13 for setting at least the address, group information, and operation information for the system device 17 by infrared communication.

[0017] The lighting controller 1 is installed, for example, inside the control panel. The lighting controller 1 supplies a signal and power supply ±24V to the system device 17 via the communication line 16. The main functions of the lighting controller 1 are shown below. (1) Function of monitoring the state of the system device 17 (2) The function of managing the system device 17 as an individual, group, zone or pattern, associating an individual, group, zone or pattern with the button of the wall switch, and turning on, off or dimming one or more dimming controllers 6, relay terminals 10, and a plurality of control terminals 8 (3) The function of dimming control of one or more control terminals 8 so that the illuminance value measured by the illuminance sensor 4 or the image sensor 3 becomes a preset illuminance value (4) Based on information such as the presence / absence / movement / number of people detected by the human presence sensor 5 or the image sensor 3, the function of turning on, off or dimming one or more control terminals 8 so that they become a preset dimming rate

[0018] The dimming controller 6 can connect up to 72 lighting fixtures 9 to the dimming signal line 7. Thus, the dimming controller 6 consumes a lot of power. For this reason, the dimming controller 6 is supplied with power from the commercial power supply. The dimming controller 6 may be provided with a function of dimming control so that the illuminance value measured by a built-in illuminance sensor (not shown) becomes a preset illuminance value. Also, the dimming controller 6 may be provided with a function of dimming control so that it becomes a preset dimming rate based on information on the presence / absence / movement / number of people detected by the human presence sensor.

[0019] The control terminal 8 is built into the lighting fixture 9 and has an individual control function of controlling each lighting fixture 9. In FIG. 1, for the sake of clarity of the configuration, the control terminal 8 and the lighting fixture 9 are shown separately. The control terminal 8 is connected to the communication line 16, supplied with signals and power ±24V, and is configured to be operable even when the commercial power supply of the lighting fixture 9 is turned off. The control terminal 8 can detect the OFF / ON of the commercial power supply of the lighting fixture 9.

[0020] The relay terminal 10 is connected to the communication line 16, supplied with signals and a 24V power supply, and can collectively control ON / OFF of a plurality of lighting fixtures 9 connected to the remote control relay 11. The remote control relay 11 is controlled by a 60ms pulse signal. Therefore, the influence on the current consumption of the relay terminal 10 is small. Although not shown here, there are two types of outputs for the relay terminal 10: one for single-circuit output and one for four-circuit output.

[0021] The wall switch 12 comes in types such as single-button type, two-button type, three-button type, four-button type, and eight-button type. Operation information such as individual ON, OFF, individual dimming, group ON, OFF, group dimming, zone ON, OFF, or zone dimming, and an address are set for each button by the infrared setter 13. This enables operation by the wall switch 12.

[0022] Figure 2 is a functional block diagram of the lighting controller 1 according to Embodiment 1. The power supply circuit 31 of the lighting controller 1 is connected to a commercial power supply via the power supply line 30, and supplies 5V and DC24V DC power supplies to the microcomputer 34 and peripheral circuits. The system device 17 is connected to the fieldbus communication circuit 32 of the lighting controller 1 via the communication line 16. The lighting monitoring device 15 is connected to the PHY circuit 33 of the lighting controller 1 via the LAN 14 and performs LAN communication with the lighting controller 1.

[0023] Connected to the microcomputer 34 are a light-emitting / receiving element 39 for transmitting and receiving infrared signals from the infrared setter 13, and a non-volatile memory 42 for storing setting data. The non-volatile memory 42 is, for example, a Flash memory. Further connected to the microcomputer 34 are an RTC (Real-Time Clock) 41 equipped with a clock function, and a RAM (Random Access Memory) 43 for storing device status data with a backup power supply. The LED display 46 lights or blinks to indicate the operating status of the lighting controller 1 such as stop, startup, normal, memory abnormality, etc., the connection status of the LAN such as LINK, ACT, traffic abnormality, etc., and the status of the communication line 16 such as current over, short circuit, communication error, etc.

[0024] The internal functions of the microcomputer 34 will be described. When a communication request occurs to the system device 17, the main processing unit 35 creates the data to be communicated and requests the field bus communication processing unit 36. The field bus communication processing unit 36 that has received the request outputs the data to the field bus communication circuit 32 bit by bit. In the field bus communication circuit 32, the data is modulated into a ±24V signal and output to the communication line 16. Conversely, the communication from the system device 17 is converted into a 5V signal that can be processed by the microcomputer in the field bus communication circuit 32, converted into the data structure by the field bus communication processing unit 36, and processed by the main processing unit 35. In this way, the field bus communication circuit 32 processes the communication between the microcomputer 34 and the communication line 16.

[0025] When the data analyzed by the microcomputer 34 indicates a change in the presence / absence state of the human sensor 5, the main processing unit 35 creates the data to be notified and notifies the facility LAN communication processing unit 37. The data is further converted into digital data by the PHY circuit 33, and the presence / absence state of the human sensor 5 is notified to the lighting monitoring device 15. Conversely, when an operation of the lighting fixture 9 occurs from the lighting monitoring device 15, the signal output to the LAN 14 is input to the facility LAN communication processing unit 37 via the PHY circuit 33 of the lighting controller 1, the UDP / IP data is analyzed, and processed by the main processing unit 35. Note that the microcomputer 34 may have a field bus transmission / reception buffer 44 and a LAN transmission / reception buffer 45 for the field bus communication processing unit 36 and the facility LAN communication processing unit 37 to store data.

[0026] The main processing unit 35 stores the setting data such as device address information, group information, pattern information, zone information, and schedule information mainly in the non-volatile memory 42, and stores the operation state mainly in the RAM 43. The schedule management unit 40 reads the schedule information set in the non-volatile memory 42 and sets the time of the next schedule to be executed in the RTC 41. When the set time arrives, the RTC 41 notifies the schedule management unit 40 of an alarm. As a result, the schedule corresponding to the alarm time is executed.

[0027] The IP address and communication destination address of the lighting controller 1 can be set from the infrared setting device 13. The IP address information transmitted from the infrared setting device 13 is converted from an optical signal into a 5V signal that can be processed by the microcomputer by the light emitting / receiving element 39, converted into a data structure by the infrared communication unit 38, processed by the main processing unit 35, and stored in the non-volatile memory 42.

[0028] When the infrared setting device 13 monitors the setting information of the IP address and communication destination address, the IP address information monitor signal transmitted from the infrared setting device 13 is converted from an optical signal into a 5V signal that can be processed by the microcomputer by the light emitting / receiving element 39. The signal is further converted into a data structure by the infrared communication unit 38. Next, the main processing unit 35 reads the IP address information stored in the non-volatile memory 42 and responds to the infrared setting device 13 via the infrared communication unit 38 and the light emitting / receiving element 39.

[0029] The short-circuit / leakage detection circuit 47 detects the current of the communication line 16 via the field bus communication circuit 32. During the section of the dummy signal 119 described later, the steady-state consumption current consumed by the system device 17 is measured. If the measured value is 500 mA + 50 mA or less, a normal determination is made. If the measured value is greater than 500 mA + 50 mA and 800 mA or less, it is determined that the component temperature of the field bus communication circuit 32 is in an alarm state. If the measured value is greater than 800 mA, it is determined as a short-circuit abnormality, and the lighting controller 1 stops the output.

[0030] Also, the short - circuit and leakage detection circuit 47 monitors the currents in the outgoing and return paths of the communication line 16. When the difference between the currents of the current detection circuit A72 and the current detection circuit B75, which will be described later, is 200 mA or more, the short - circuit and leakage detection circuit 47 determines it as a leakage of the communication line 16. The short - circuit abnormality and leakage state of the determination result are recorded in the non - volatile memory 42 as current abnormality information together with the occurrence time, frequency, or cumulative occurrence count. Also, the short - circuit abnormality and leakage state are displayed on the LED display 46.

[0031] Here, the short - circuit and leakage detection circuit 47 of the lighting controller 1 has been described. However, the functions and configurations of the short - circuit and leakage detection circuit 58 of the amplifier 2, which will be described later, are the same as those of the short - circuit and leakage detection circuit 47. In the short - circuit and leakage detection circuit 58, the short - circuit abnormality and leakage state are displayed on the LED display 62.

[0032] FIG. 3 is a functional block diagram of the amplifier 2 according to Embodiment 1. The power supply circuit 51 of the amplifier 2 is connected to the commercial power supply via the power supply line 50 and supplies 5V and 24V DC power supplies to the microcomputer 54 and peripheral circuits. The amplifier 2 has a function of adding 500 mA to the power supply capacity when the power supply current of the lighting controller 1 is insufficient, and a function of extending the wiring length of the communication line 16 of the lighting controller 1 by 500 m when the wiring length exceeds 500 m. When extending the wiring length, the amplifier 2 will be connected in series. The communication line 16 and the power supply circuit 51 of the amplifier 2 are insulated by the photocoupler of the field bus communication circuit 52, and the circuit configuration is such that the noise of the communication line 16 on the input side does not affect the communication line 16 on the output side.

[0033] The operation of the amplifier 2 will be described. The output of the lighting controller 1 or another amplifier 2 is connected to the field bus communication circuit 52 via the communication line 16. The field bus communication circuit 52 converts the power supply voltage into a signal that can be processed by the microcomputer 54. The converted signal is analyzed by the field bus communication processing unit 56, and the analysis result is processed by the main processing unit 55. At the same time, the waveform detection circuit 53 diagnoses the signal waveform of the field bus communication circuit 52 and monitors whether there is any abnormality in the waveform. If there is no abnormality in the waveform, the signal of the field bus communication circuit 52 is output to the field bus communication circuit 57 to relay the downstream signal. On the other hand, if there is an abnormality in the waveform, the content of the abnormality is notified to the main processing unit 55, and the main processing unit 55 stores the error information and the occurrence time in the non-volatile memory 59 and does not output the signal of the field bus communication circuit 52 to the field bus communication circuit 57.

[0034] Also, the main processing unit 55 determines whether the received data is relay data or health check data. In the case of relay data, the received data is output from the field bus communication processing unit 56 to the field bus communication circuit 57 and transmitted to the output of the communication line 16. At the same time, the signal waveform of the field bus communication circuit 57 is diagnosed by the short-circuit and leakage detection circuit 58, and it is monitored whether there is any abnormality in the waveform. If there is no abnormality in the waveform, the signal of the field bus communication circuit 57 is output to the field bus communication circuit 52 to relay the upstream signal. On the other hand, if there is an abnormality in the waveform, the content of the abnormality is notified to the main processing unit 55, and the main processing unit 55 adds the occurrence time to the error information and stores it in the non-volatile memory 59, and does not output the signal of the field bus communication circuit 57 to the field bus communication circuit 52.

[0035] In this way, while the amplifier 2 has a current amplification function of controlling the current of the upstream signal generated on the output side as the current of the upstream signal on the input side, when a short circuit is detected by diagnosing the signal waveform, the short-circuit current generated on the output side is not amplified as the signal on the input side.

[0036] On the one hand, when the received data is health check data, the main processing unit 55 adds the configuration information of the amplifier 2 to the received data in the field bus communication processing unit 56, notifies the field bus communication circuit 57, and transmits it to the output of the communication line 16. Since the waveform diagnosis process of the short - circuit / leakage detection circuit 58 is the same as that of the short - circuit / leakage detection circuit 47, it is omitted.

[0037] The infrared ray setter 13 sets the address of the amplifier 2 and the communication destination address. The address information of the device transmitted from the infrared ray setter 13 is converted from an optical signal to a 5V signal that can be processed by the microcomputer 54 by the light - emitting / receiving element 61, and is converted into the data structure by the infrared ray communication unit 60. The converted data is analyzed by the main processing unit 55, and the address information is stored in the non - volatile memory 59.

[0038] When the infrared ray setter 13 monitors the failure information of the system device 17, the monitor signal of the failure information transmitted from the infrared ray setter 13 is converted from an optical signal to a 5V signal that can be processed by the microcomputer 54 by the light - emitting / receiving element 61. The converted signal is converted into the data structure by the infrared ray communication unit 60. Next, the main processing unit 55 reads the error information stored in the non - volatile memory 59 and responds to the infrared ray setter 13 via the infrared ray communication unit 60 and the light - emitting / receiving element 61.

[0039] The microcomputer 54 of the amplifier 2 causes the LED display 62 to light up or blink to indicate the operating states such as the stop, startup, normal, and memory abnormality of the amplifier 2, and the error states of the communication line 16 such as current over, short - circuit, and communication error.

[0040] Figure 4 is a functional block diagram of the short - circuit / leakage detection circuit 47 and the field bus communication circuit 32 according to Embodiment 1. Here, the configurations of the short - circuit / leakage detection circuit 47 and the field bus communication circuit 32 of the lighting controller 1 are described, but the configurations of the short - circuit / leakage detection circuit 58 and the field bus communication circuit 57 of the amplifier 2 are the same.

[0041] The power supply circuit 31 outputs 5V and 24V DC power supplies. DC24V is supplied to the high-side half-bridge circuit 78 and the low-side half-bridge circuit 79 via the switch circuit 71 and the current detection circuit A72. The switch circuit 71 is configured to switch the on / off of power supply to the system device 17. The microcomputer 34 controls the high-side half-bridge circuit 78 and the low-side half-bridge circuit 79 via the dead-time control circuit 77 according to the bit information of the communication frame 90 described later, and supplies ±24V to the signal line terminal block 80. The system device 17 is connected to the signal line terminal block 80 via a pair of communication lines 16.

[0042] The current detection circuit A72, the filter circuit 73, and the comparison circuit A74 constitute a first current detection unit. As will be described later, the first current detection unit is connected to the high side of the communication line 16 and is configured to detect the current due to the short circuit of the communication line 16. The current detection circuit A72 is configured to detect the current flowing from the communication line 16. The filter circuit 73 is configured to remove the upstream signal from the system device 17 to the lighting controller 1 from the current detected by the current detection circuit A72 and input it to the comparison circuit A74. That is, the pulse current of the upstream signal is removed from the current detected by the current detection circuit A72 by the filter circuit 73. The output current of the filter circuit 73 is input to the microcomputer 34 and the comparison circuit A74. The comparison circuit A74 is configured to receive the current detected by the current detection circuit A72 via the filter circuit 73 and compare the input current with a preset threshold value. The output of the comparison circuit A74 is input to the microcomputer 34 as a short circuit signal.

[0043] The output currents on the low-voltage sides of the high-side half-bridge circuit 78 and the low-side half-bridge circuit 79 are compared with a preset current by the current detection circuit B75 and the comparison circuit B76. The output currents on the low-voltage sides are input to the microcomputer 34 as the pulse currents of the upstream signals 113, and the communication frame is analyzed.

[0044] The current detection circuit B75 and the comparison circuit B76 constitute a second current detection unit. The second current detection unit is connected to the low side of the communication line 16 and is configured to detect an upstream signal. The current detection circuit B75 is configured to detect the current flowing from the communication line 16. The comparison circuit B76 is configured to compare the current detected by the current detection circuit B75 with a preset threshold value.

[0045] FIG. 5 is a diagram for explaining the configuration of a communication signal flowing through the communication line 16 according to Embodiment 1. The communication frame 90 is composed of a start bit 92, a priority 93, a response determination 94, an address type 95, an address 96, a data section 97, a SUM 101, a wait time 102, and a response data 91. The priority indicates the priority order when signals collide and is 0 priority. The response determination is used to request a response. The address type 95 represents the type of the destination device. The address 96 represents the address of the destination.

[0046] The data section 97 includes a data length 98 representing the length of the data section 97, a command 99 representing the type of the data section 97, and data 100 for the command 99. The SUM 101 represents the two's complement of the sum from the priority 93 to the data 100. The wait time 102 indicates a waiting time. The response data 91 is data for responding when a response is requested by the response determination 94.

[0047] The address type 95 representing the device type indicates, for example, the classification of an image sensor, a human sensor, an illuminance sensor, a dimming controller, a control terminal device, a relay terminal device, and a wall switch, and the address 96 is assigned for each device type. When the response determination 94 requesting a response has a response, the response data 91 includes status or error information.

[0048] FIG. 6A is a diagram for explaining the bit definition of the downlink signal 110 according to Embodiment 1. FIG. 6B is a diagram for explaining the bit definition of the uplink signal 113 according to Embodiment 1. FIG. 6C is a diagram for explaining the bit definition of the dummy signal 119 according to Embodiment 1. FIG. 6A shows the waveform of the downlink signal 110 in the downlink transmission section output from the field bus communication circuit 32 of the lighting controller 1 and the field bus communication circuit 52 of the amplifier 2. The downlink signal 110 of the communication frame 90 changes with a voltage of ±24V. When the pulse width is 100 μS, it is the "0" data 111, and when the pulse width is 300 μS, it is the "1" data 112. In this way, the downlink signal is transmitted from the lighting controller 1 to the system device 17 by changing the waveform of the power supply voltage.

[0049] As shown in FIG. 6C, when there is no communication frame 90 transmitted from the lighting controller 1, a dummy signal 119 with a pulse width of 900 μS and a voltage of ±24V is transmitted.

[0050] When the response determination 94 of the communication frame 90 transmitted from the lighting controller 1 is "1", it means there is a response, and the transmission timing of the response data 91 occurs after a wait time 118 of 1 ms. As shown in FIG. 6B, in the uplink signal section of the response data 91, there is a waveform 115 with a pulse width of 400 μS after a waveform 114 with a pulse width of 100 μS. As the response data 91 from the system device 17, when a pulse signal of current of 50 μS is superimposed on the first half 200 μS period of the waveform 115, it represents the "0" data 116, and when a pulse signal of current of 50 μS is superimposed on the second half 200 μS period, it represents the "1" data 117. In this way, the uplink signal is transmitted from the system device 17 to the lighting controller 1 by changing the waveform of the current. On the other hand, when the lighting controller 1 normally receives the pulse signal of current, it sets the pulse width of the waveform 114 to 200 μS. Thereby, it can be detected at the system device 17 that the lighting controller 1 has received normally.

[0051] FIG. 7 is a diagram for explaining a communication command specification according to Embodiment 1. The lighting controller 1 checks the state and system configuration of the system device 17 using the health check command of command 99 at startup and at regular intervals, for example, every one second. The data 100 of the health check command 99 includes a state and an abnormality code 104.

[0052] As a result, an address duplication, interface abnormality, memory abnormality, input circuit abnormality, short circuit, or output circuit abnormality such as a waveform delay abnormality detected by the system device 17, and a communication waveform abnormality indicating an abnormal sag are notified to the lighting controller 1 as an abnormality code. Also, a state change detected by the system device 17 is similarly notified to the lighting controller 1 as a state change notification command.

[0053] The lighting controller 1 notifies the lighting monitoring device 15 of the notified abnormality code and state change of the system device 17, and stores them in the non-volatile memory together with the generation time information. The lighting monitoring device 15 displays this information on the monitoring screen.

[0054] The current consumption is measured in the lighting controller 1 and the amplifier 2. The lighting monitoring device 15 compares the current consumption calculated from the number of output terminators, input terminators, and connection bases of the wall switch 12 with the current consumption measured in the lighting controller 1 and the amplifier 2. The lighting monitoring device 15 has a function of determining a wiring abnormality and a function of displaying the result when there is a difference greater than or equal to the set value in the comparison result. Also, on the setting screen of the lighting monitoring device 15, the state, current consumption, and wiring abnormality of the system device 17 are displayed on the screen.

[0055] Figures 8A to 8F are diagrams for explaining wiring error patterns. Figure 8A shows a wiring error pattern P1 in which the communication line 16 of the lighting controller 1 is short-circuited between lines. Figure 8B shows a wiring error pattern P2 in which the communication line 16 of the amplifier 2 connected to the communication line 16 of the lighting controller 1 is short-circuited between lines. Figure 8C shows a wiring error pattern P3 in which the communication line 16 of the lighting controller 1 and the communication line 16 of the lighting controller 1 are interconnected. That is, in the wiring error pattern P3, the outputs of the lighting controller 1 are erroneously connected to each other.

[0056] Figure 8D shows a wiring error pattern P4 in which the communication line 16 of the amplifier 2 connected to the communication line 16 of the lighting controller 1 and the communication line 16 of the lighting controller 1 are interconnected. That is, in the wiring error pattern P4, the output of the lighting controller 1 and the output of the amplifier 2 are erroneously connected. Figure 8E shows a wiring error pattern P5 in which the communication line 16 of the amplifier 2 connected to the communication line 16 of the lighting controller 1 and the communication line 16 of the amplifier 2 connected to the communication line 16 of the lighting controller 1 are interconnected. That is, in the wiring error pattern P5, the outputs of the amplifier 2 are erroneously connected to each other. Figure 8F shows a wiring error pattern P6 in which the communication line 16 of the lighting controller 1 and the communication line 16 on the output side of the amplifier 2 are interconnected. That is, in the wiring error pattern P6, the output of the lighting controller 1 and the output of the amplifier 2 are erroneously connected. Hereinafter, the wiring error patterns P1 and P2 may be referred to as a short circuit or a short circuit between lines, and the wiring error patterns P3 to P6 may be referred to as an interconnection or an erroneous connection.

[0057] Figure 9 is a diagram showing an example of voltage waveforms and current waveforms at the time of a short circuit between lines according to Embodiment 1. These waveforms correspond to the waveforms of the wiring error patterns P1 and P2 of the short circuit between lines. As shown in the output of the comparison circuit B76, a sag 130 occurs in the voltage waveforms of the rising edge of +24V and the falling edge of -24V of the downstream signal 110 depending on the length of the communication line 16, the number of branches, and the number of connected system devices 17. When the sag is large, there is a possibility that a communication error may occur in the reception processing of the system device 17 and the amplifier 2.

[0058] The waveform detection circuit 53 of the amplifier 2 and the waveform detection circuit of the system device 17 (not shown) are configured to perform a process of removing the current waveform during a 70 μS period from the time of the polarity change of the voltage waveforms of the downstream signal 110 and the upstream signal 113. That is, it can also be said that the amplifier 2 is provided with a removal circuit that removes the current waveform of the inrush current generated when the polarity of the downstream signal from the lighting controller 1 to the system device 17 is reversed. Thereby, the sag 130 can be removed. Further, the waveform detection circuit is configured to measure the width of the current waveform at a timing after the 70 μS period from the time of the polarity change, and perform a process of treating it as noise if it is outside the specified value range.

[0059] In the lighting controller 1 and the amplifier 2, when a line-to-line short circuit occurs, a large current is generated in the current detection circuit B75. The comparison circuit B76 compares the current detected by the current detection circuit B75 with a preset threshold value, for example, 0.8 A. When the detected current is larger than the threshold value, the output of the comparison circuit B76 becomes ON. Also, a large current is generated in the current detection circuit A72. The comparison circuit A74 compares the current detected by the current detection circuit A72 with a preset threshold value, for example, 0.8 A. Note that an 80 ms delay occurs in the output of the comparison circuit A74 by the filter circuit 73. When the detected current is larger than the threshold value, the output of the comparison circuit A74 becomes ON. Thereafter, the ON output continues. The microcomputer 34 or the microcomputer 54 can detect a short circuit based on the comparison result of the comparison circuit A74.

[0060] FIG. 10 is a diagram showing an example of the voltage waveform and the current waveform at the time of interconnection according to the first embodiment. This waveform corresponds to the waveform of the miswiring pattern P6 of the interconnection. Since the input side of the amplifier 2 is open, the output is fixed at +24V. On the other hand, ±24V is output from the lighting controller 1. A large current is generated in the communication line 16 when the output of the lighting controller 1 is -24V. For this reason, the output of the comparison circuit B76 becomes ON intermittently, and the output of the comparison circuit A74 becomes ON after a delay of 80 ms.

[0061] FIG. 11 is a diagram showing examples of voltage waveforms and current waveforms during interconnection according to Embodiment 1. These waveforms correspond to the waveforms of the miswiring patterns P3, P4, and P5 of the interconnection. ±24V is output from the lighting controller 1 and the amplifier 2. When the outputs of interconnected devices have opposite polarities, a large current is generated in the communication line 16. For this reason, the output of the comparison circuit B76 turns ON irregularly, and the output of the comparison circuit A74 also turns ON irregularly after a delay of 80 ms.

[0062] The microcomputer 34 or the microcomputer 54 can detect misconnections such as the miswiring patterns P3 to P6 based on the comparison result of the comparison circuit B76. That is, misconnections can be detected from the waveform of the comparison circuit B76 generated by the interconnection.

[0063] In this way, the microcomputer 34 or the microcomputer 54 is configured to detect a short circuit between the communication lines 16 from the detection result of the first current detection unit and detect the interconnection from the detection result of the second current detection unit. The interconnection includes misconnections between the output of the lighting controller 1 and the output of the amplifier 2, misconnections between the outputs of the lighting controller 1, or misconnections between the outputs of the amplifier 2.

[0064] FIG. 12 is a diagram showing a communication line diagnosis flow at startup according to Embodiment 1. When the power is turned on, the microcomputer 34 of the lighting controller 1 performs a startup process (S1). The microcomputer 34 turns off the switch circuit 71 for a predetermined time, for example, 1 second, in order to discharge the residual current of the power supply circuit of the system device 17 connected to the communication line 16 (S2). Next, the microcomputer 34 turns on the switch circuit 71 and outputs a dummy signal 119 to the communication line 16 (S3).

[0065] As a result, a large charging current flows through the system device 17, and comparison with the threshold value is performed by the comparison circuit A74 on the high side (S4). If a short circuit is detected in the short circuit determination (S5), the microcomputer 34 turns off the switch circuit 71 for 30 ms, which is the first time period (S6). Next, if the diagnosis time is less than 2.5 seconds, which is the second time period (S7), the microcomputer 34 turns on the switch circuit 71 again (S3), and repeats the processes from S3 to S7. When the power supply circuit of the system device 17 is fully charged, it is determined that there is no short circuit, and the charging control is completed.

[0066] On the other hand, if the determination in S7 is 2.5 seconds or more, the microcomputer 34 stores the short circuit error information in the non-volatile memory 42 (S8), turns on the LED display 46 to notify the short circuit error (S9). Further, the microcomputer 34 turns off the switch circuit 71 for 25 seconds, which is a predetermined time period, in order to protect the high side half bridge circuit 78 and the low side half bridge circuit 79 (S10). During the occurrence of a short circuit, the processes from S3 to S10 are repeated.

[0067] In this way, when the lighting controller 1 is started up, if the current detected by the current detection circuit A72 exceeds the threshold value, the microcomputer 34 turns off the switch circuit 71 for a predetermined first time period, and cuts off the power supply to the system device 17 connected to the communication line 16. After the elapse of the first time period, the microcomputer 34 turns on the power supply to the system device 17 again to determine whether the current detected by the current detection circuit A72 exceeds the threshold value. When the microcomputer 34 turns off the power supply to the system device 17 via the communication line 16 for only the first time period, if a predetermined second time period longer than the first time period has elapsed since the start-up, a short circuit is detected.

[0068] At startup, a short - circuit state occurs due to the power - supply current to the system device 17. As described above, the microcomputer 34 intermittently turns the switch circuit 71 ON - OFF so that the output is within the rated value and gradually charges. When a current exceeding the threshold continues for more than the second hour, it is determined as a short - circuit state, so that a short - circuit can be detected even at startup when a large current flows due to charging.

[0069] The microcomputer 34 may detect a short - circuit when the number of times the power supply to the system device 17 is turned off during the startup of the lighting controller 1 is equal to or more than a predetermined number of times. When detecting a short - circuit at startup, it is preferable that a predetermined dummy signal is output to the communication line 16. Also, during the startup of the amplifier 2, the microcomputer 54 performs the same processing.

[0070] If no short - circuit is detected in the short - circuit determination (S5), the microcomputer 34 samples the edge and status of the output waveform of the low - side comparison circuit B76 in the section of the dummy signal 119 (S11). In the diagnosis - count determination (S12), the microcomputer 34 checks the number of times of the dummy signal 119. If it is less than the specified number of times, the sampling in S11 is performed again. When the number of times of the dummy signal 119 is equal to or more than the specified number of times, the microcomputer 34 counts the edges during the period of the dummy signal 119 (S13). If it is 50 or more of the specified value, it is determined as an interconnection. The microcomputer 34 turns off the switch circuit 71 for 10 seconds, which is a predetermined time (S15). Next, it stores the information on the miswiring error of the interconnection in the non - volatile memory 42 (S16), and blinks the LED display 46 to notify a short - circuit error (S17).

[0071] In the edge counting (S13), in order to detect a signal waveform as shown in FIG. 11, the microcomputer 34 counts the rising edges of the comparison circuit B76. By counting the rising edges of the comparison circuit B76, interconnections such as miswiring patterns P3 - P5 can be detected.

[0072] When the count of edges (S13) is less than 50, which is the specified value, the microcomputer 34 determines the count of the status of the dummy signal 119 during the period of the dummy signal 119 (S14). When the count is 30 or more, which is the specified value, the microcomputer 34 determines that there is an interconnection. The microcomputer 34 turns off the switch circuit 71 for 10 seconds, which is a predetermined time (S18), stores the information of the miswiring error of the interconnection in the non-volatile memory 42 (S19), and blinks the LED display 46 to notify a short-circuit error (S20). In the status count, in order to detect the signal waveform based on the miswiring pattern P6 as shown in FIG. 10, the microcomputer 34 counts the ON of the comparison circuit B76.

[0073] In this way, the microcomputer 34 can detect a misconnection based on the number of times the current detected by the current detection circuit B75 exceeds the threshold value. Also, it can be said that the microcomputer 34 can detect the type of misconnection based on the number of times the current detected by the current detection circuit B75 exceeds the threshold value. The specified value for the determination may vary depending on the communication environment. Therefore, a function may be provided to set the optimum value from the lighting monitoring device 15 or the infrared setting device 13. When the microcomputer 34 detects a misconnection, it is preferable that a predetermined dummy signal is output to the communication line 16. Similarly, in the amplifier 2, the microcomputer 54 can detect a misconnection.

[0074] In the determination of the status count (S14), when the count is less than 30, which is the specified value, the microcomputer 34 detects the current on the high side of the current detection circuit A72 (S21). Next, the microcomputer 34 detects the current on the low side of the current detection circuit B75 (S22). The microcomputer 34 stores the average of the current on the high side and the current on the low side as the steady-state current in the non-volatile memory 42 (S23). In this way, the microcomputer 34 can calculate the steady-state current from the average value of the current detected by the first current detection unit and the current detected by the second current detection unit.

[0075] Also, when the difference between the current on the high side and the current on the low side exceeds a specified value, the microcomputer 34 stores it in the non-volatile memory 42 as a leakage current error (S23). That is, the microcomputer 34 can detect current leakage when the difference between the current detected by the first current detection unit and the current detected by the second current detection unit is equal to or greater than a predetermined value. Similarly, in the microcomputer 54 of the amplifier 2, the calculation of the steady current and the detection of current leakage can be performed. Thus, the communication line diagnosis process at startup is completed. Note that the calculation of the steady current and the detection of current leakage are preferably performed during the period when the dummy signal is being output.

[0076] FIG. 13 is a diagram showing the communication line diagnosis flow during operation according to the first embodiment. The microcomputer 34 of the lighting controller 1 periodically performs the process of diagnosing miswiring during normal operation (S30). In the downlink signal 110 section (S31), the microcomputer 34 detects the current on the high side by the current detection circuit A72 (S32). When it is determined that there is a short circuit in the short circuit determination (S33), the switch circuit 71 is turned off for 30 ms, which is a predetermined time (S34). Next, the microcomputer 34 stores the information of the short circuit miswiring error in the non-volatile memory 42 (S35), turns on the LED display 46 to notify the short circuit error (S36), and ends the miswiring diagnosis (S39).

[0077] If it is determined that there is no short circuit in the short circuit determination (S33), the microcomputer 34 determines whether it is within the section of the dummy signal 119 (S37). If it is not within the dummy section, the miswiring diagnosis is terminated (S39). In the case of the dummy signal section, the edges and status states of the output waveform of the low-side comparison circuit B76 are sampled (S38). In the diagnosis count determination (S40), the microcomputer 34 checks the number of times of the dummy signal 119. If the number is less than the specified number, the sampling in S38 is performed again. When the number of times of the dummy signal 119 is equal to or more than the specified number, the microcomputer 34 determines the count of the edges of the dummy signal 119 (S41). If it is 50 or more of the specified value, it is determined as an interconnection. The microcomputer 34 turns off the switch circuit 71 for 10 seconds, which is a predetermined time (S46). Next, the information on the miswiring error of the interconnection is stored in the non-volatile memory 42 (S47), and the LED display 46 is blinked to notify a short circuit error (S48).

[0078] If the count of the edges is less than 50 in the edge count determination (S41), the microcomputer 34 performs the determination of the status count (S42). If it is 30 or more of the specified value, it is determined as an interconnection. The microcomputer 34 turns off the switch circuit 71 for 10 seconds, which is a predetermined time (S56), and stores the information on the miswiring error of the interconnection in the non-volatile memory 42 (S57). Further, the microcomputer 34 blinks the LED display 46 to notify a short circuit error (S58) and terminates the miswiring diagnosis (S39). Similar to the startup, the interconnections such as the miswiring patterns P3 to P5 can be detected by the edge count, and the interconnections such as the miswiring pattern P6 can be detected by the status count.

[0079] In the determination of the status count (S42), if it is less than 30 of the specified value, the microcomputer 34 detects the current on the high side of the current detection circuit A72 (S43). Next, the microcomputer 34 detects the current on the low side of the current detection circuit B75 (S44). The microcomputer 34 saves the average of the current on the high side and the current on the low side as the steady-state current in the non-volatile memory 42 (S45). Further, when the difference between the current on the high side and the current on the low side is greater than or equal to the specified value, the microcomputer 34 saves it as a leakage current error in the non-volatile memory 42 (S45) and ends the miswiring diagnosis (S39).

[0080] When it is not in the downlink signal 110 section (S31), the microcomputer 34 determines whether it is in the uplink signal 113 section (S50). When it is in the uplink signal section, the microcomputer 34 detects the signal of the comparator circuit B76 on the low side (S51). When the detected current waveform exceeds 200 μS of the specified value (S52), the microcomputer 34 turns off the switch circuit 71 as an uplink signal error for a predetermined time of 10 seconds (S53). Next, the microcomputer 34 saves the information of the uplink signal error in the non-volatile memory 42 (S54), causes the LED display 46 to blink rapidly to notify a short-circuit error (S55), and ends the miswiring diagnosis (S39). When it is not an uplink signal and when the detected current waveform is less than the specified value, the miswiring diagnosis is ended. (S39)

[0081] In FIGS. 12 and 13, the communication line diagnosis flow of the lighting controller 1 has been described, but the operations at the start-up and during operation of the amplifier 2 are the same, and the same diagnosis can be performed.

[0082] From the above, according to the present embodiment, a first current detection unit configured to detect a current due to a short circuit of the communication line 16 and a second current detection unit configured to detect an uplink signal can detect miswiring including a short circuit and a wrong connection of the communication line 16. Therefore, equipment failure due to miswiring can be suppressed.

[0083] The first current detection unit has a filter circuit 73 so as not to erroneously detect, as an upstream signal, a feedback current having, for example, a pulse width of 50 μS and a current value of 800 mA or more. By detecting a short circuit with such a first current detection unit, the load of signal processing of the microcomputers 34 and 54 can be reduced and the short circuit can be detected. Note that a short circuit is determined based on the measurement of the level of the short-circuit current of the output of the filter circuit 73 and the output of the comparison circuit A74.

[0084] Note that when interconnecting, a signal is intermittently generated at the output of the comparison circuit A74, and there may be a state where there is no signal depending on the timing. For this reason, depending on the first current detection unit, stable detection of the interconnection cannot be achieved.

[0085] Also, the second current detection unit can detect the behavior of the current generated during interconnection. The upstream signal detected by the current detection circuit B75 is checked by the microcomputers 34 and 54 to see if a waveform of a specified 50 μS appears at the specified timing of the upstream signal. Note that a large current is also detected by the current detection circuit B75 during a short circuit, but since this is not at the predetermined timing and pulse width, the microcomputers 34 and 54 can determine that it is not an upstream signal. Thus, according to the present embodiment, a short circuit and a misconnection can be detected by easy signal determination by the microcomputers 34 and 54.

[0086] In the present embodiment, an example has been described in which the first current detection unit is connected to the high side, which is the power supply side of the field bus communication circuits 32 and 52, and the second current detection unit is connected to the low side, which is the ground side of the field bus communication circuits 32 and 52. The connection locations of the first and second current detection units are not limited to this. Also, the configurations of the first and second current detection units are not limited to those shown in FIG. 4. The first current detection unit only needs to be configured to detect the current due to a short circuit of the communication line 16. Also, the second current detection unit only needs to be configured to detect an upstream signal.

[0087] Note that the first current detection unit may be connected to either the high side or the low side of the communication line 16, and the second current detection unit may be connected to the other of the high side and the low side of the communication line 16. By providing the first and second current detection units on the high side and the low side, the difference between the sweep current and the suction current can be obtained. Therefore, it becomes possible to detect current leakage and calculate the steady current. Thereby, for example, the validity of the wiring can be confirmed by comparing the load current of the connected device with the planned current.

[0088] Here, a short circuit of the lighting controller 1 or an interconnection between the lighting controllers 1 as shown in the miswiring patterns P1 and P3 will be detected by the lighting controller 1. When detecting such miswiring, the first and second current detection units and the control unit for detecting miswiring are provided in the lighting controller 1. Also, a short circuit of the amplifier 2 or an interconnection between the amplifiers 2 as shown in the miswiring patterns P2 and P5 will be detected by the amplifier 2. When detecting such miswiring, the first and second current detection units and the control unit for detecting miswiring are provided in the amplifier 2. The first and second current detection units and the control unit for detecting miswiring may be provided in at least one of the lighting controller 1 and the amplifier 2 according to the pattern to be detected.

[0089] The various thresholds, times, etc. described above are examples and are not limited. Also, the lighting controller 1 or the amplifier 2 may have means for notifying miswiring other than the LED displays 46 and 62. Also, in the present embodiment, an example in which the control units for detecting miswiring are the microcomputers 34 and 54 has been described, but the control unit can be realized by any processing device such as a processor. The control unit may be realized by a plurality of processing devices.

[0090] Also, the present embodiment is not limited to the lighting control system, and can be applied to any control system including a controller, a system device configured to communicate with the controller via a communication line in a multiplex transmission method and to be powered from the controller via the communication line. Also, depending on the configuration of the control system, the amplifier 2 may not be provided.

[0091] The technical features described in this embodiment may be used in appropriate combination.

[0092] Hereinafter, various aspects of the present disclosure will be collectively described as appendices. (Appendix 1) A controller, A system device connected to the controller via a communication line and configured to communicate in a multiplex transmission system and be powered from the controller via the communication line, An amplifier connected to the communication line, Comprising: At least one of the controller and the amplifier is A first current detection unit configured to detect a current due to a short circuit of the communication line, A second current detection unit configured to detect an upstream signal from the system device to the controller, A control unit configured to detect a short circuit of the communication line from the detection result of the first current detection unit and detect a misconnection between the output of the controller and the output of the amplifier, a misconnection between the outputs of the controllers, or a misconnection between the outputs of the amplifiers from the detection result of the second current detection unit, A control system characterized by having the above. (Appendix 2) The controller has the first current detection unit, the second current detection unit, and the control unit, and the control system according to Appendix 1 is characterized by this. (Appendix 3) The amplifier has the first current detection unit, the second current detection unit, and the control unit, and the control system according to Appendix 1 or 2 is characterized by this. (Appendix 4) The first current detection unit A first current detection circuit configured to detect a current flowing from the communication line, A first comparison circuit configured to compare the current detected by the first current detection circuit with a preset threshold value, A filter circuit configured to remove the upward signal from the current detected by the first current detection circuit and input the result to the first comparison circuit, and having The control system according to any one of Appendices 1 to 3, wherein the control unit detects the short circuit based on the comparison result of the first comparison circuit. (Appendix 5) The second current detection unit includes a second current detection circuit configured to detect the current flowing through the communication line, a second comparison circuit configured to compare the current detected by the second current detection circuit with a preset threshold value, and having The control system according to any one of Appendices 1 to 4, wherein the control unit detects the misconnection based on the comparison result of the second comparison circuit. (Appendix 6) The control system according to Appendix 5, wherein the control unit detects the misconnection based on the number of times the current detected by the second current detection circuit exceeds the threshold value. (Appendix 7) The control system according to Appendix 5 or 6, wherein the control unit detects the type of misconnection based on the number of times the current detected by the second current detection circuit exceeds the threshold value. (Appendix 8) The control system according to any one of Appendices 5 to 7, wherein when the control unit detects the misconnection, a predetermined dummy signal is output to the communication line. (Appendix 9) The first current detection unit is connected to one of the high side and the low side of the communication line, The second current detection unit is connected to the other of the high side and the low side of the communication line, The control system according to any one of Appendices 1 to 8, wherein the control unit detects current leakage when the difference between the current detected by the first current detection unit and the current detected by the second current detection unit is equal to or greater than a predetermined value. (Appendix 10) The first current detection unit is connected to one of the high side and the low side of the communication line. The second current detection unit is connected to the other of the high side and the low side of the communication line. The control unit calculates a steady current from an average value of the current detected by the first current detection unit and the current detected by the second current detection unit, and is the control system according to any one of Appendices 1 to 9. (Appendix 11) When starting up the controller or the amplifier, the control unit if the current detected by the first current detection circuit exceeds the threshold value, cuts off power supply to the system device via the communication line for a predetermined first time, after the elapse of the first time, turns on the power supply to the system device again and determines whether the current detected by the first current detection circuit exceeds the threshold value, and detects a short circuit when a predetermined second time longer than the first time has elapsed from the start-up at the time when the power supply to the system device via the communication line is cut off for the first time, and is the control system according to Appendix 4. (Appendix 12) The control unit detects a short circuit when the number of times of turning off the power supply to the system device at the start-up is equal to or more than a predetermined number of times, and is the control system according to Appendix 11. (Appendix 13) When detecting a short circuit at the start-up, a predetermined dummy signal is output to the communication line, and is the control system according to Appendix 11 or 12. (Appendix 14) The controller or the amplifier includes a switch circuit configured to switch on and off the power supply to the system device, and is the control system according to any one of Appendices 1 to 13. (Appendix 15) The amplifier is provided with a removal circuit for removing the current waveform of the inrush current generated when the polarity of the downstream signal from the controller to the system device is reversed. The control system according to any one of Appendices 1 to 14, characterized in that. (Appendix 16) When the short circuit is detected, the amplifier does not amplify the short circuit current generated on the output side as the signal on the input side. The control system according to any one of Appendices 1 to 15, characterized in that.

Explanation of symbols

[0093] 1 Lighting controller, 2 Amplifier, 3 Image sensor, 4 Illuminance sensor, 5 Human presence sensor, 6 Dimming controller, 7 Dimming signal line, 8 Control terminal device, 9 Lighting fixture, 10 Relay terminal device, 11 Remote control relay, 12 Wall switch, 13 Infrared setting device, 14 LAN, 15 Lighting monitoring device, 16 Communication line, 17 System device, 30 Power line, 31 Power supply circuit, 32 Fieldbus communication circuit, 33 PHY circuit, 34 Microcomputer, 35 Main processing unit, 36 Fieldbus communication processing unit, 37 Facility LAN communication processing unit, 38 Infrared communication unit, 39 Light emitting / receiving element, 40 Schedule management unit, 42 Non-volatile memory, 44 Fieldbus transmission / reception buffer, 45 LAN transmission / reception buffer, 46 LED display, 47 Short circuit / leakage detection circuit, 50 Power line, 51 Power supply circuit, 52 Fieldbus communication circuit, 53 Waveform detection circuit, 54 Microcomputer, 55 Main processing unit, 56 Fieldbus communication processing unit, 57 Fieldbus communication circuit, 58 Short circuit / leakage detection circuit, 59 Non-volatile memory, 60 Infrared communication unit, 61 Light emitting / receiving element, 62 LED display, 71 Switch circuit, 72 Current detection circuit A, 73 Filter circuit, 74 Comparison circuit A, 75 Current detection circuit B, 76 Comparison circuit B, 77 Dead time control circuit, 78 High side half bridge circuit, 79 Low side half bridge circuit, 80 Signal line terminal block, 1000 Lighting control system

Claims

1. A controller, a system device connected to the controller via a communication line and communicating in a multiplex transmission system, and configured to be powered from the controller via the communication line, an amplifier connected to the communication line, comprising: at least one of the controller and the amplifier is a first current detection unit configured to detect a current due to a short circuit of the communication line, a second current detection unit configured to detect an upstream signal from the system device to the controller, a control unit configured to detect a short circuit of the communication line from a detection result of the first current detection unit, and detect a misconnection between an output of the controller and an output of the amplifier, a misconnection between outputs of the controllers, or a misconnection between outputs of the amplifiers from a detection result of the second current detection unit, A control system characterized by having the above.

2. The control system according to claim 1, wherein the controller has the first current detection unit, the second current detection unit, and the control unit.

3. The control system according to claim 1, wherein the amplifier has the first current detection unit, the second current detection unit, and the control unit.

4. The first current detection unit is a first current detection circuit configured to detect a current flowing through the communication line, a first comparison circuit configured to compare the current detected by the first current detection circuit with a preset threshold value, a filter circuit configured to remove the upstream signal from the current detected by the first current detection circuit and input it to the first comparison circuit, having: The control system according to any one of claims 1 to 3, wherein the control unit detects the short circuit based on a comparison result of the first comparison circuit.

5. The second current detection unit is a second current detection circuit configured to detect a current flowing through the communication line, a second comparison circuit configured to compare the current detected by the second current detection circuit with a preset threshold value, having: The control system according to any one of claims 1 to 3, wherein the control unit detects the misconnection based on a comparison result of the second comparison circuit.

6. The control system according to claim 5, wherein the control unit detects the misconnection based on the number of times the current detected by the second current detection circuit exceeds the threshold value.

7. The control system according to claim 5, wherein the control unit detects the type of the incorrect connection based on the number of times the current detected by the second current detection circuit exceeds the threshold value.

8. The control system according to claim 5, wherein when the control unit detects the incorrect connection, a predetermined dummy signal is output to the communication line.

9. The first current detection unit is connected to one of the high side and the low side of the communication line, The second current detection unit is connected to the other of the high side and the low side of the communication line, The control system according to any one of claims 1 to 3, wherein the control unit detects current leakage when a difference between the current detected by the first current detection unit and the current detected by the second current detection unit is equal to or greater than a predetermined value.

10. The first current detection unit is connected to one of the high side and the low side of the communication line, The second current detection unit is connected to the other of the high side and the low side of the communication line, The control system according to any one of claims 1 to 3, wherein the control unit calculates a steady current from an average value of the current detected by the first current detection unit and the current detected by the second current detection unit.

11. When starting the controller or the amplifier, if the current detected by the first current detection circuit exceeds the threshold value, power supply to the system device via the communication line is turned off for a predetermined first time, after the elapse of the first time, power supply to the system device is turned on again to determine whether the current detected by the first current detection circuit exceeds the threshold value, The control system according to claim 4, wherein a short circuit is detected when a predetermined second time longer than the first time has elapsed since the start at the time when power supply to the system device via the communication line is turned off for the first time.

12. The control system according to claim 11, wherein the control unit detects the short circuit when the number of times of turning off power supply to the system device at the start is equal to or greater than a predetermined number of times.

13. The control system according to claim 11, wherein when detecting the short circuit at the start, a predetermined dummy signal is output to the communication line.

14. The control system according to any one of claims 1 to 3, wherein the controller or the amplifier includes a switch circuit configured to switch on / off power supply to the system device.

15. The control system according to any one of claims 1 to 3, wherein the amplifier includes a removal circuit configured to remove a current waveform of an inrush current generated when a polarity of a downstream signal from the controller to the system device is inverted.

16. The control system according to any one of claims 1 to 3, wherein when the short circuit is detected, the amplifier does not amplify a short circuit current generated on the output side as a signal on the input side.

Images