JP2018182488A - Two-way communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-way communication system in which a communication state can be confirmed by an operation side terminal.SOLUTION: A machine side terminal 50 comprises: a third radio unit 54 for performing reception using a radio wave having a first frequency band; an output section 58 for outputting an operation instruction to a subordinate industrial machine 70; and a fourth radio unit 62 for transmitting working state information on the industrial machine 70 using a radio wave having a second frequency band. The machine side terminal 50 comprises MCUs 52, 60 and the like for monitoring a communication state in a radio wave received from an operation side terminal 11 by the third radio unit 54. The fourth radio unit 62 of the machine side terminal 50 transmits monitoring results of the MCUs 52, 60 and the like using the radio wave having the second frequency band. A display 30 and status display section 40 of the operation side terminal 11 display the monitoring results received by a second radio unit 17.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a two-way communication system, and more particularly to a two-way communication system capable of remote control by wireless communication.

  Conventionally, in an operation in which the machine is remotely controlled by wireless communication, wireless communication control by one-way communication has often been used in an environment where a person can not easily approach the machine (see Patent Document 1). There are also devices that control a machine by two-way communication using wireless LAN communication.

Utility model registration No. 3152036

  However, in the outdoor environment or in the environment where there is an obstacle, there is a possibility that communication may become unstable. In the past, even if such a state occurred continuously, the operator who performed the remote control could not know.

  An object of the present invention is to provide a two-way communication system in which a communication state can be confirmed by an operating terminal.

  In order to solve the above-mentioned problems, the present invention is a two-way communication system comprising an operation side terminal and a machine side terminal, wherein the operation side terminal transmits an operation command by radio of a first frequency band. Operation-side wireless transmission unit, an operation-side wireless reception unit that wirelessly receives a second frequency band different from the first frequency band, and a display unit that displays operation state information of a machine that is an operation target of the operation command The machine-side terminal includes a machine-side wireless reception unit that wirelessly receives the first frequency band, an output unit that outputs the operation command to the subordinate machine, and operation state information of the machine at the second frequency. A machine-side wireless transmission unit for wireless transmission in a band, and a monitoring unit for monitoring a wireless communication state received by the machine-side wireless reception unit from the operation-side terminal, the machine-side wireless transmission unit comprising The monitoring result is displayed in the second frequency band. Transmitted by the line, the display unit of the operation terminal is for displaying the fact of monitoring results of the monitoring portion received in said operating-side wireless receiving unit.

Further, the monitoring unit may include a machine-side reception intensity measurement unit that measures a radio RSSI value received by the machine-side wireless reception unit, and the RSSI value may be the monitoring result.
Further, the monitoring unit may include a condition grasping unit that grasps the status of the communication error of the radio received by the machine-side wireless reception unit, and the result grasped by the condition grasping unit may be the monitoring result.

  Further, the operation-side wireless reception unit includes an operation-side reception strength measurement unit that measures the received RSSI value of the wireless, and the display unit displays the RSSI value of the wireless received by the operation-side wireless reception unit. May be

  According to the present invention, the communication state can be confirmed by the operation side terminal.

FIG. 1 is a schematic view of a two-way communication system according to one embodiment. (A)-(c) is a front view of the operation surface of the operation side terminal. The flowchart of the processing which MCU13 performs. The flowchart of the processing which MCU16 performs. The flowchart of the processing which MCU52 performs. The flowchart of the 1st interrupt processing which MCU60 performs. The flowchart of the 2nd interruption processing which MCU60 executes. The flowchart of the 3rd interrupt processing which MCU60 performs. The flowchart of the main loop process which MCU60 performs.

Hereinafter, an embodiment of a two-way communication system embodying the present invention will be described with reference to FIGS. 1 to 9.
<Industrial machine 70>
First, with reference to FIG. 1, an industrial machine 70 whose operation is performed by the two-way communication system will be described.

  The industrial machine 70 includes a hydraulic pump 72, and a variable speed motor 73 capable of adjusting the rotational speed (the number of revolutions per unit time) is connected to the input shaft of the hydraulic pump 72 by changing the frequency. ing. An oil tank 74 and an actuator 75 are connected to the hydraulic pump 72. When the hydraulic pump 72 is operated by the rotation of the variable speed motor 73, the oil stored in the oil tank 74 is supplied to the actuator 75 through the pipe. Although not shown, a grout pump for supplying fresh concrete is used as the actuator 75. In this embodiment, a drive mechanism for driving the actuator 75 is configured by the hydraulic pump 72, the variable speed motor 73, and the like.

  The variable speed motor 73 is connected to an inverter device 76 which is a control amount adjusting mechanism. The inverter device 76 changes the rotational speed (the number of revolutions per unit time) of the variable speed motor 73 according to an acceleration command or a deceleration command as an operation command described later.

  That is, the frequency of the alternating current supplied to the variable speed motor 73 is changed by the inverter device 76, and the rotational speed of the variable speed motor 73 is adjusted. Then, by adjusting the rotational speed of the variable speed motor 73, the discharge amount of oil of the hydraulic pump 72 is adjusted, and the working amount of the actuator 75, that is, the supply amount of fresh concrete of the grout pump is adjusted. ing.

  In this embodiment, the adjustment range of the frequency of the inverter device 76 is set to 0 Hz to 60 Hz, and when the frequency is 0 Hz, the rotational speed of the variable speed motor 73 is zero. Further, the frequency resolution of the inverter device 76 is 256, and is adjusted in small increments of about 0.2 Hz.

  In addition, the industrial machine 70 is provided with a pressure sensor 77 for detecting the hydraulic pressure of the hydraulic pump and a rotation number sensor 78 for detecting the rotation number of the variable speed motor 73. Detection signals of the pressure sensor 77 and the rotation speed sensor 78 are output to an MCU 60 of the machine side terminal 50 described later. The hydraulic pressure and the rotational speed correspond to operation state information of the machine.

Next, a two-way communication system of a wireless communication system for remotely controlling the industrial machine 70 will be described.
This two-way communication system 10 receives the operation command transmitted from the operation-side terminal 11 and the "communication state data" of the wireless, while schematically displaying the operation-side terminal 11 transmitting various operation commands. And the like, and is configured by the machine-side terminal 50 that transmits and the like. First, the operation side terminal 11 will be described.

<Operating terminal 11>
As shown in FIG. 1, in the operation side terminal 11, an MCU (micro control unit) 13 for transmission, a first radio unit 14, an MCU 16 for reception, a second radio unit 17 and a battery (not shown) are housed in a case 12 ing. Further, as shown in FIG. 2A, the operation switch unit 20 and the display 30 are respectively disposed on the right and left sides of the surface (that is, the operation surface) of the case 12, and the status display is shown at the center in the horizontal direction. A unit 40 is provided. The display 30 and the status display unit 40 correspond to a display unit that displays the "operation state information" of the machine.

  Each MCU has a central processing unit (CPU) that performs various arithmetic processing, a read only read only memory (ROM) that stores various processing programs, and a read / write random access that stores various data -Memory (RAM) etc. are provided. The first wireless unit 14 transmits various operation commands to the machine side terminal 50 via the antenna 15. The first wireless unit 14 corresponds to the operation side wireless transmission unit.

  In addition, after the various operation commands are transmitted from the operation side terminal 11, the predetermined time is stored in the storage unit (not shown) of the MCU 13, and when there is a retransmission request from the machine side terminal 50 within the predetermined time, The MCU 13 retransmits the operation command, and if there is no request for retransmission within a predetermined time, the operation command is erased.

  The second wireless unit 17 also receives various signals from the machine side terminal 50 via the antenna 19. The second wireless unit 17 includes an RSSI measurement unit 18 that measures the signal strength (RSSI value) of the wireless signal transmitted from the machine-side terminal 50. The second wireless unit 17 corresponds to the operation-side wireless reception unit. The RSSI measurement unit 18 corresponds to the operation side reception strength measurement unit.

  As shown in FIG. 2A, the operation switch unit 20 includes a power ON switch 21, a power OFF switch 22, an operation switch 23, a stop switch 24, a speed increasing switch 25 and a speed reducing switch 26.

  The power on switch 21 and the power off switch 22 are disposed adjacent to each other in the vertical direction. The power supply switch 21 is an operation switch for supplying power (not shown) to various circuits of the operation side terminal 11. Further, the power off switch 22 is an operation switch for turning off the power of the operation side terminal 11.

  The operation switch 23 and the stop switch 24 are disposed adjacent to the right side of the power ON switch 21 and the power OFF switch 22, respectively. The operation switch 23 is an operation switch for operating the hydraulic pump 72 (variable speed motor 73). The stop switch 24 is an operation switch for stopping the hydraulic pump 72 (variable speed motor 73). When the operation switch 23 is turned on, an operation command as an operation command is input to the MCU 13 described later. When the stop switch 24 is turned on, a stop command as an operation command is input to the MCU 13 described later.

  Further, the speed increasing switch 25 and the speed reducing switch 26 are disposed adjacent to the right side of the operation switch 23 and the stop switch 24, respectively. The speed increasing switch 25 adjusts the frequency of the inverter device 76 in the increasing direction to increase the rotational speed of the variable speed motor 73, thereby increasing the discharge amount of the hydraulic pump 72, and stepping up the amount of work of the actuator 75. Operation switch to increase the

  Every time the acceleration switch 25 is turned on after the power on switch 21 and the operation switch 23 are turned on, the operation command (ie, acceleration instruction) is transmitted via the first wireless unit 14 by the MCU 13 each time it is turned on. Will be sent. As a result, the frequency of the inverter device 76 of the industrial machine 70 is increased by approximately 0.2 Hz in the range of 0 to 60 Hz based on the operation command received by the machine side terminal 50, and the rotational speed of the variable speed motor 73 Is gradually and continuously accelerated. Further, when the speed increasing switch 25 is kept in the on state, the MCU 13 increases the frequency quickly.

  Every time the deceleration switch 26 is turned on after the power on switch 21 and the operation switch 23 are turned on, the MCU 13 transmits its operation command (that is, a deceleration command) via the first wireless unit 14. Be done. Thereby, the frequency of the inverter device 76 of the industrial machine 70 is decreased by about 0.2 Hz at a time within the range of 0 to 60 Hz based on the operation command received by the machine side terminal 50, and the rotation speed of the variable speed motor 73 Is to be decelerated continuously in small increments. In addition, when the speed reduction switch 26 is kept in the on state, the frequency is rapidly decreased.

  As shown in FIGS. 2A and 2B, the display 30 has a display area 31. The display area 31 includes the rotational speed display area 32 of the variable speed motor 73, the operation terminal side reception sensitivity display area 33, the pressure display area 34, the communication state data display area 36, the reception sensitivity level display area 38 and FIG. An unreceived state display area 39 is shown. The rotational speed display area 32 is an area for displaying the rotational speed of the variable speed motor 73. The operation terminal side reception sensitivity display area 33 is an area where the signal strength of the radio transmitted from the machine side terminal 50 measured by the RSSI measurement unit 18 is displayed as a numerical value.

  The pressure display area 34 is an area for displaying the hydraulic pressure of the hydraulic pump 72 detected by the pressure sensor 77. The communication state data display area 36 is a display area showing the result of monitoring performed by the machine side terminal 50 for wireless communication from the operation side terminal 11. Further, the reception sensitivity level display area 38 is an area for displaying the level of the reception sensitivity at the machine side terminal 50 for the wireless communication from the operation side terminal 11. The non-reception state display area 39 is a display area for displaying a state in which the operation side terminal 11 has not received by wireless communication with the machine side terminal 50.

  As shown to Fig.2 (a), the status display part 40 is provided with the power supply lamp 41, the radio | wireless lamp | ramp 43, and the pressure abnormality lamp | ramp 47, and each lamp | light is arrange | positioned in line form vertically. Each light may be, for example, an LED (light emitting diode), but is not limited to the LED.

The power light 41 is turned on by the MCU 16 shown in FIG. 1 when the power on switch 21 is turned on, and turned off by the MCU 16 when the power off switch 22 is turned off.
The wireless light 43 is turned on by the MCUs 13 and 16 when transmission or reception with the machine side terminal 50 is successful with the power on switch 21 in the on state, and turned off otherwise. Become.

  The pressure error lamp 47 is turned on by the MCU 16 when the power-on switch 21 is in the ON state and the “operation status information (hydraulic pressure)” received by the operation-side terminal 11 is an abnormal value, otherwise it is not , Turns off. In this embodiment, the MCU 16 compares the operation status information (hydraulic pressure) with the reference value to determine whether or not the operation status information (hydraulic pressure) is an abnormal value, but the MCU 60 described later performs abnormality determination on the machine side terminal 50 side. Alternatively, either lighting or extinguishing may be performed based on the determination result transmitted from the machine side terminal 50 side.

<Machine side terminal 50>
Next, the machine side terminal 50 will be described.
As shown in FIG. 1, an MCU 52 for reception, a third wireless unit 54, an output unit 58, an MCU 60 for transmission, a fourth wireless unit 62, and a power supply (not shown) are housed in the case 51. Each MCU has a central processing unit (CPU) that performs various arithmetic processing, a read only read only memory (R0M) that stores various processing programs, and a read / write random access that stores various data -Memory (RAM) etc. are provided. The MCUs 52 and 60 correspond to a monitoring unit and a condition grasping unit.

  The third wireless unit 54 receives various operation commands from the operation side terminal 11 via the antenna 55. In addition, the third wireless unit 54 includes an RSSI measurement unit 56 that measures the signal strength (RSSI value) of the radio transmitted from the operation side terminal 11. The RSSI measurement unit 56 corresponds to the machine-side reception strength measurement unit and the monitoring unit. The output unit 58 outputs the operation command output from the MCU 52 to the inverter device 76. The third wireless unit 54 corresponds to the machine-side wireless reception unit.

  The MCU 60 performs processing described later on “communication status data” described later and detection signals (operation status information) input from the pressure sensor 77 and the rotation speed sensor 78 of the industrial machine 70 and outputs the processed data to the fourth wireless unit 62 Do. The fourth wireless unit 62 wirelessly transmits to the operation side terminal 11 via the antenna 63. The fourth wireless unit 62 corresponds to the machine-side wireless transmission unit. The details of the processing of the MCUs 52 and 60 will be described later.

(Function of the embodiment)
The operation of the two-way communication system 10 configured as described above will now be described with reference to FIGS. For convenience of explanation, it is assumed that the power on switch 21 is turned on in the operation side terminal 11. Then, in this state, it is assumed that the power off switch 22 and the speed increasing switch 25 (or the speed reducing switch 26) are operated.

<Process of MCU 13 of Operation-side Terminal 11>
FIG. 3 is a flowchart of a processing program that the MCU 13 executes in a predetermined control cycle. In S10, the MCU 13 creates communication data for each device identification number of the operation side terminal 11 and the machine side terminal 50 and an operation command according to the operation according to a communication protocol set in advance, and transmits the first communication data together with the synchronization signal. Transmission processing is performed by the wireless unit 14 via the antenna 15, and this processing is temporarily ended.

  The first wireless unit 14 transmits using a carrier of 429 MHz band as the first frequency band. The 429 MHz band is a frequency used by a specific low power radio station, and is a frequency that can be used by a radio station that does not require a license.

<Process of MCU 52 of Machine-side Terminal 50>
FIG. 5 is a flowchart of a processing program executed by the MCU 52 at a predetermined control cycle.

At S40, the MCU 52 controls the third wireless unit 54 to perform reception processing.
At S42, the MCU 52 performs "input processing" of the received data. The device identification numbers and the operation commands of the operation side terminal 11 and the machine side terminal 50 are acquired by the “input process”.

  In S44, the MCU 52 performs an error check as to whether the device identification numbers of the operation side terminal 11 and the machine side terminal 50 and the identification numbers stored in advance by the MCU 52 are consistent with each other obtained in the “input process”. An error check such as consistency between the sync signal and sync signal reference data stored in advance by the MCU 52 is performed. In addition, since the method of an error check may be a well-known method, detailed description is abbreviate | omitted.

If there is no communication error as a result of the error check, the MCU 52 determines that the reception is normal and proceeds to S46. If there is an error, the MCU 52 proceeds to S50.
At S46, the MCU 52 resets the error display. Specifically, an error display flag and an error display time T described later are reset to zero.

At S48, the MCU 52 outputs an operation command to the output unit 58.
At S50, the MCU 52 increments the error counter N.
At S52, the MCU 52 determines whether the error counter N is equal to or greater than the determination reference value Na. If the error counter N exceeds the determination reference value Na, the determination is "YES" and the process proceeds to S54. If the error counter N is less than the determination reference value Na, the process returns to S40. In the present embodiment, the determination reference value Na is “3”, but is not limited to this value, and may be, for example, a value of “1”, “2”, or “4” or more. The determination process of S52 is for causing the processes of S40 and S42 to be performed again when the number of errors is smaller than the determination reference value Na.

  Although not described in detail, when the MCU 52 determines a communication error in S44, the communication error causes the device identification numbers of the operation side terminal 11 and the machine side terminal 50 to be matched, but the operation command etc. Is unknown, the MCU 60 issues a retransmission request to the operation side terminal 11 via the fourth wireless unit 62. Thereafter, for the communication data retransmitted from the operation side terminal 11 in response to the retransmission request, there may be a case where there is no communication error in the determination processing of S44. Assuming such a case, the process of S52 is provided.

  In S54, the MCU 52 performs "error display processing" and shifts to S56. Specifically, the “error display process” includes the setting of the error display flag and the counting up of the error display time T.

  In S56, the MCU 52 determines whether the error display time T is equal to or longer than the first determination reference time Ta. If the error display time T is equal to or longer than the first determination reference time Ta, the determination is "YES" and the process proceeds to S58. If the error display time T is less than the first determination reference time Ta, the process returns to S40. In the present embodiment, the first determination reference time Ta is set to 3 seconds, but is not limited to this value, and may be another numerical value.

In S58, the MCU 52 stops all the output operations to the output unit 58, and shifts to S60.
In S60, the MCU 52 counts up the total output stop time T1 from when all the output operations to the output unit 58 have been stopped, and proceeds to S62. The total output stop time T1 is an initial value "0". When all the output operations to the output unit 58 are stopped, the driving of the variable speed motor 73 by the inverter device 76 is stopped.

  In S62, the MCU 52 determines whether the total output stop time T1 is equal to or longer than the second determination reference time Tb. When the total output stop time T1 is less than the second determination reference time Tb, the MCU 52 returns to S40, and when the all output stop time T1 is the second determination reference time Tb or more, the determination is “YES”. Move to S64. In the present embodiment, the second determination reference time Tb is 3 seconds. However, the second determination reference time Tb is not limited to this value, and may be another numerical value.

  At S64, the MCU 52 returns the inverter device 76 to the power-on state, which is the initial operating state, and resets the error counter N, the error display time T, and the all output stop time T1 to zero.

  Here, defect processing of the MCU 52 will be described. The defect processing of the MCU 52 is as follows. Even when the MCU 52 determines that there is a communication error in S44 shown in FIG. 5, the MCU 52 does not handle all of the communication errors as a defect process.

  For example, as described above, when there is no communication error in the communication data retransmitted in response to the retransmission request, the MCU 52 does not treat it as a defect process due to the communication error. That is, in this case, the MCU 52 stores “communication state data” in which the communication state is normal, in a storage unit (not shown) provided in the MCU 52.

  Here, as an example which becomes defective processing, a case where the determination in S52 is "YES" is mentioned as a typical example. In such a case, the MCU 52 stores “communication state data” in which the communication state is an error state (defect) in a storage unit (not shown) provided in the MCU 52.

<Processing of MCU 60 of Machine-side Terminal 50>
Next, processing of the MCU 60 will be described with reference to FIGS.
<About the first interrupt processing>
First, with reference to FIG. 6, the first interrupt process, which is the highest priority process, will be described. This interrupt process is performed in a predetermined control cycle.

At S70, the MCU 60 monitors the reception state of the MCU 52.
At S72, the MCU 60 proceeds to S74 when the MCU 52 is in the reception state, and proceeds to S76 when the MCU 52 is not in the reception state.

  When the MCU 52 is in the reception state, the MCU 52 sets a state flag indicating the reception state, and when the MCU 52 is not in the reception state, the state flag is reset. The MCU 60 determines the reception state of the MCU 52 based on the state flag.

At S74, the MCU 60 performs Main loop operation mode processing described later.
In S76, the MCU 60 resets the Main loop operation mode, returns the inverter device 76 to the power-on state which is the initial operation state via the output unit 58, and temporarily ends this process. The Main loop process executed in the Main loop operation mode will be described later.

<Second interrupt processing>
Next, with reference to FIG. 7, the second interrupt process, which is the highest priority process, will be described. This interrupt process is performed in a predetermined control cycle. The control cycle is, for example, an interval of 100 msec, but is not limited to this value.

In S80, the MCU 60 monitors the RSSI value measured by the RSSI measurement unit 56 of the third wireless unit 54 via the MCU 52.
At S82, the MCU 60 performs data processing on the RSSI value so as to be suitable for transmission to be performed later, and temporarily ends this flowchart.

<Third interrupt processing>
Next, the third interrupt processing will be described with reference to FIG. This interrupt process is performed in a predetermined control cycle. The control cycle is a 1 sec cycle and an interval of 100 msec, but is not limited to this value.

At S90, the MCU 60 monitors defective processing of the MCU 52.
In S92, when the “communication state data” stored in the storage unit of the MCU 52 includes “communication state data” which is in an error state (defective), the MCU 60 proceeds to S94.

  In S94, the "communication state data" is subjected to data processing so as to be suitable for transmission to be performed later, the data is stored in a storage unit (not shown) provided in the MCU 60, and this flowchart is once ended.

When there is “communication state data” which is assumed to be in the normal state in S92, the MCU 60 proceeds to S96.
In S96, the "communication state data" is subjected to data processing so as to be suitable for transmission to be performed later, the data is stored in a storage unit (not shown) provided in the MCU 60, and this flowchart is once ended.

<Main loop processing>
Next, with reference to FIG. 9, the main loop processing to be executed in the main loop operation mode will be described. The main loop process is performed in a predetermined control cycle.

In S100, the MCU 60 causes the industrial machine 70 (that is, the inverter device 76) to output the operation command input by the output unit 58 from the MCU 52.
For example, when the operation command is a speed increase command, the inverter device 76 speeds up the variable speed motor 73 based on the speed increase command. When the operation command is a deceleration command, inverter device 76 decelerates variable speed motor 73 based on the deceleration command. When the operation command is an operation command, inverter device 76 is in the power-on state, which is the initial operating state. In the power-on state, the power is turned on but the variable speed motor 73 is stopped. When the operation command is a stop command, the supply of power to the inverter device 76 is shut off to stop the variable speed motor 73.

  In S102, the MCU 60 performs a sensor monitoring process of the industrial machine 70. Specifically, “operation state information (oil pressure and rotation number)” detected by the pressure sensor 77 and the rotation number sensor 78 of the industrial machine 70 is input.

At S104, the MCU 60 performs data conversion processing of "operation state information" which is an output value of the sensor so as to be suitable for transmission to be performed later.
At S106, the MCU 60 performs connection processing with the data that has been subjected to the data conversion processing in the second interrupt processing and the third interrupt processing described above.

  At S108, the MCU 60 uses the fourth wireless unit 62 to transmit the antenna 63 together with the device identification numbers of the operation-side terminal 11 and the machine-side terminal 50 that have been matched at S44 and the data subjected to connection processing at S106. The transmission process is performed via this and the process is temporarily ended. In the present embodiment, the fourth wireless unit 62 transmits using the carrier of 920 MHz band as the second frequency band. The 920 MHz band is a frequency used by a specific low power radio station, and is a frequency that can be used by a radio station that does not require a license.

<Process of MCU 16 of Operation-side Terminal 11>
The process of the MCU 16 of the operation side terminal 11 will be described with reference to FIG. FIG. 4 is a flowchart of a processing program that the MCU 16 executes in a predetermined control cycle.

  At S20, the MCU 16 determines whether or not there has been reception from the fourth wireless unit 62 on the machine side. Here, the MCU 16 performs the same process as the process performed by the MCU 52 in S44 in FIG. 5, and as a result of reception, if there is no communication error, the MCU 16 shifts to S22 and there is a communication error And when there is no reception itself, it transfers to S26.

In S22, the MCU 16 receives the RSSI value measured by the RSSI measurement unit 18, and shifts to S24.
In S24, the MCU 16 causes the display 30 and the status display unit 40 to perform display operations based on the received “communication state data” and “operation state information” (see FIGS. 2A and 2B). , Return to S20.

  In S26, the MCU 16 causes the display 30 and the status display unit 40 to perform an operation of displaying the unreceived state (see FIG. 2C), and returns to S20. FIG. 2A shows an example of display states of the display 30 and the status display unit 40 when the “communication state data” is in the normal state and the hydraulic pressure is normal. As shown in the figure, the rotational speed display area 32 and the pressure display area 34 of the display 30 respectively display the rotational speed and the hydraulic pressure (pressure) which are operation state information. Further, in the communication state data display area 36, an icon indicating that the state is normal is displayed. Further, in the operation terminal side reception sensitivity display area 33, the RSSI value measured by the RSSI measurement unit 18 is displayed. Further, the power supply lamp 41 and the wireless lamp 43 are turned on, and the pressure abnormality lamp 47 is turned off to indicate that there is no pressure abnormality.

  FIG. 2B shows an example of the display state of the display 30 when the “communication state data” is in an error state and the hydraulic pressure is abnormal. As shown in the figure, the rotational speed display area 32 and the pressure display area 34 of the display 30 respectively display the rotational speed and the hydraulic pressure (pressure) which are operation state information. In addition, in the communication state data display area 36, an icon indicating that it is in an error state is displayed. Further, in the operation terminal side reception sensitivity display area 33, the RSSI value measured by the RSSI measurement unit 18 is displayed.

In addition, in FIG.2 (b), the power supply light 41 and the wireless light 43 are lighted. Further, the pressure abnormality lamp 47 is turned on to notify of the pressure abnormality.
FIG. 2C shows an example of the display state of the display 30 when waiting for wireless communication from the machine side terminal 50. As shown in the figure, the rotational speed display area 32, the pressure display area 34, the operation terminal side reception sensitivity display area 33, the communication state data display area 36, and the reception sensitivity level display area 38 of the display 30 are not displayed. Instead, “SCAN” indicating that the user is on standby is displayed in the unreceived state display area 39.

Further, the power lamp 41 and the wireless lamp 43 of the status display unit 40 are turned on, while the pressure abnormality lamp 47 is turned off because the signal is not received from the machine side terminal 50.
Here, since the display of the unreceived state display area 39 is displayed, the operator can understand that the reason for turning off the pressure abnormal light 47 is that reception from the machine side terminal 50 is not performed.

The present embodiment has the following features.
(1) In the two-way communication system 10 of the present embodiment, the operation-side terminal 11 transmits the operation command by radio of the first frequency band (429 MHz band) by the first radio unit 14 (operation-side radio transmission unit); It has a second wireless unit 17 (operation-side wireless reception unit) that wirelessly receives a second frequency band (920 MHz band). The operation side terminal 11 further includes a display 30 (display unit) for displaying operation state information of the industrial machine 70 (machine) which is an operation target of the operation command, and a status display unit 40 (display unit).

  The machine-side terminal 50 further includes a third wireless unit 54 (machine-side wireless receiving unit) that wirelessly receives the first frequency band, an output unit 58 that outputs the operation command to the subordinate industrial machine 70, and an industrial machine A fourth wireless unit 62 (machine-side wireless transmission unit) that transmits the operating state information of the wireless communication of the second frequency band wirelessly is provided. The machine-side terminal 50 further includes MCUs 52 and 60 (monitoring unit) that monitor the wireless communication state received by the third wireless unit 54 (machine-side wireless receiving unit) from the operation-side terminal 11. The fourth wireless unit 62 (machine-side wireless transmission unit) of the machine-side terminal 50 transmits the monitoring results of the MCUs 52, 60, etc. (monitoring unit) wirelessly in the second frequency band, and the display 30 of the operation-side terminal 11 ( Display unit) and the status display unit 40 (display unit) display the result of the monitoring result received by the second wireless unit 17 (operation-side wireless reception unit). As a result, according to the present embodiment, the communication state can be confirmed by the operation side terminal.

  (2) In the two-way communication system 10 according to the present embodiment, the monitoring unit measures the RSSI value of the radio received by the third wireless unit 54 (machine-side wireless reception unit) RSSI measurement unit 56 (machine-side reception strength measurement And the RSSI value as the monitoring result. As a result, according to the present embodiment, it is possible to notify the operator of the wireless reception sensitivity on the machine side terminal 50 side, change the location operated by the operator, and select a suitable location where the reception sensitivity is increased. Can.

  (3) In the two-way communication system 10 according to the present embodiment, the monitoring unit detects the status of the communication error of the wireless received by the third wireless unit 54 (machine-side wireless receiving unit). including. And the result which the said condition grasping | ascertainment part grasped is made into the monitoring result. As a result, the effect of the above (1) can be easily realized.

  (4) In the two-way communication system 10 of the present embodiment, the second wireless unit 17 (operation-side wireless reception unit) of the operation-side terminal 11 measures the received RSSI value of the radio (RSSI measurement unit 18 (operation-side reception) The display 30 (display unit) displays the RSSI value of the radio received by the second radio unit 17 (operation-side radio reception unit). As a result, the operator can notify the operator of the wireless reception sensitivity on the operation side terminal 11 side, and can change the location operated by the operator to select a suitable location where the reception sensitivity is increased.

The embodiment of the present invention is not limited to the above embodiment, and may be modified as follows.
In the above embodiment, a 429 MHz carrier wave is used as the first frequency band, but another frequency used by a specific low power radio station such as the 1.2 GHz band may be used as the first frequency band.

The carrier wave of 920 MHz band is used as the second frequency band in the above embodiment, but another frequency band may be used as the second frequency band for use in a specific low power radio station.
In the embodiment described above, the reception sensitivity is displayed as the reception sensitivity level display area 38, but may be changed to a reception sensitivity display area displayed numerically.

10: two-way communication system, 11: operation side terminal, 12: case,
13: MPU for transmission, 14: first wireless unit (operation side wireless transmission unit),
15: Antenna, 16: MPU for reception,
17 ... 2nd wireless unit (operation side wireless receiver),
18 ... RSSI measurement unit (operation side reception intensity measurement unit),
19 ... antenna, 20 ... operation switch unit, 21 ... power on switch,
22 ... Power off switch, 23 ... operation switch, 24 ... stop switch,
25 ... acceleration switch, 26 ... deceleration switch,
30 ... display (display section), 31 ... display area,
32 ... rotation speed display area, 33 ... operation terminal side reception sensitivity display area,
34 ... pressure display area, 36 ... communication state data display area,
38: Reception sensitivity level display area, 39: Unreceived state display area,
40 Status display unit (display unit) 41 Power supply light 43 Wireless light
47: pressure abnormal light, 50: machine side terminal, 51: case,
52: MCU for reception (monitoring unit, status grasping unit),
54: Third wireless unit (machine-side wireless receiving unit), 55: antenna,
56 ... RSSI measurement unit (machine side reception intensity measurement unit, monitoring unit),
58 ... output unit, 60 ... MCU for transmission (monitoring unit, status grasping unit),
62 ... 4th wireless unit (machine-side wireless transmission unit), 63 ... antenna
70 ... industrial machine, 72 ... hydraulic pump, 73 ... variable speed motor,
74 ... oil tank, 75 ... actuator, 76 ... inverter device,
77: Pressure sensor 78: rotational speed sensor
N: Error counter, Na: Judgment reference value,
T: Error display time, Ta: Judgment reference time, T1: All output stop time.

Claims (4)

A two-way communication system comprising an operation side terminal and a machine side terminal, comprising:
The operation side terminal transmits an operation instruction by radio of a first frequency band, an operation side radio reception unit by radio of a second frequency band different from the first frequency band, and the operation And a display unit for displaying operation state information of a machine which is an operation target of the command.
The machine-side terminal includes a machine-side wireless receiving unit for wirelessly receiving a first frequency band, an output unit for outputting the operation command to the subordinate machine, and wireless communication of a second frequency band for operating state information of the machine. And a monitoring unit for monitoring a wireless communication state received by the machine-side wireless reception unit from the operation-side terminal.
The machine-side wireless transmission unit transmits the monitoring result of the monitoring unit wirelessly in the second frequency band, and the display unit of the operation-side terminal monitors the monitoring unit received by the operation-side wireless reception unit A two-way communication system that displays the outcome of the result.   The two-way communication system according to claim 1, wherein the monitoring unit includes a machine-side reception strength measurement unit that measures a radio RSSI value received by the machine-side wireless reception unit, and uses the RSSI value as the monitoring result.   The monitoring unit includes a situation grasping unit that grasps the status of a communication error of the radio received by the machine-side wireless reception unit, and uses the result grasped by the situation grasping unit as the monitoring result. The two-way communication system described in. The operation-side wireless reception unit includes an operation-side reception strength measurement unit that measures the received RSSI value of the wireless,
The two-way communication system according to any one of claims 1 to 3, wherein the display unit displays the RSSI value of the radio received by the operation-side radio reception unit.