JP3211199U - Operation side terminal, machine side terminal, and bidirectional communication operation system - Google Patents

Abstract

Provided is a bidirectional communication operation system including an operation side terminal capable of performing an accurate and efficient operation and a machine side terminal by obtaining machine-side operation state information. An operating terminal includes a first radio unit that transmits an operation command by radio in a first frequency band that is a specific low power radio, and a first radio unit that is a specific low power radio and is different from the first frequency band. A second wireless unit 17 that receives radio waves in two frequency bands, and a display 30 that displays the hydraulic pressure of the hydraulic pump 72 of the industrial machine 70 and the rotational speed of the variable speed motor 73 are provided. The machine-side terminal 50 includes a third wireless unit 54 that receives radio waves in the first frequency band, an output unit 58 that outputs an operation command to the subordinate industrial machine 70, and the hydraulic pressure and rotational speed of the hydraulic pump 72 of the industrial machine 70. Is transmitted by radio in the second frequency band. [Selection] Figure 1

Description

  The present invention relates to an operation side terminal, a machine side terminal, and a bidirectional communication operation system.

  Conventionally, wireless communication control by one-way communication has been frequently used in an operation in which a person is not easily brought close to a machine to remotely operate the machine by wireless communication.

However, in the wireless communication control by the one-way communication, there is a problem that the control amount on the machine side and the state of the machine load are not known, so that an accurate and efficient work cannot be performed.
An object of the present invention is to provide an operation side terminal, a machine side terminal, and a two-way communication operation system capable of performing an accurate and efficient work by obtaining machine-side operation state information.

  In order to solve the above problems, the present invention is a bidirectional communication operation system including an operation side terminal and a machine side terminal, wherein the operation side terminal is a first low frequency band that is a specific low power radio. An operation-side radio transmission unit that transmits an operation command by wireless, an operation-side radio reception unit that receives a radio of a specific low power radio and a second frequency band different from the first frequency band, and operation of the operation command A display unit that displays operation state information of a target machine, and the machine-side terminal outputs a radio signal of a first frequency band to the machine under control of the machine-side radio reception unit that receives radio of the first frequency band. An output unit and a machine-side wireless transmission unit that wirelessly transmits operation state information of the machine in a second frequency band are provided.

  In addition, the present invention is an operation side terminal that performs bidirectional communication with a machine side terminal, an operation side wireless transmission unit that transmits an operation command wirelessly in a first frequency band that is a specific low power radio, and a specific low power An operation side wireless reception unit that is wireless and receives a radio of a second frequency band different from the first frequency band, and a display unit that displays operating state information of a machine that is an operation target of the operation command. is there.

  In addition, the present invention is a machine side terminal that performs two-way communication with an operation side terminal, and outputs a machine side radio reception unit that receives radio in the first frequency band, and outputs the received operation command to a subordinate machine. And a machine-side wireless transmission unit that wirelessly transmits the operating state information of the machine in the second frequency band.

The first frequency band may be a 429 MHz band or a 1.2 GHz band.
The second frequency band may be a 920 MHz band.

  According to the present invention, it is possible to obtain the operation state information on the machine side, and thus it is possible to perform an accurate and efficient work.

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

With reference to FIGS. 1 to 9, an embodiment of an operation side terminal, a machine side terminal and a bidirectional communication operation system embodying the present invention will be described below.
<Industrial machine 70>
First, an industrial machine 70 that is operated by a bidirectional communication operation system will be described with reference to FIG.

  The industrial machine 70 includes a hydraulic pump 72, and a variable speed motor 73 capable of adjusting a rotation speed (the number of rotations per unit time) by changing a frequency is connected to an input shaft of the hydraulic pump 72. ing. An oil tank 74 and an actuator 75 are connected to the hydraulic pump 72. When the hydraulic pump 72 is actuated 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 piping. As this actuator 75, although not shown, a grout pump for supplying ready-mixed concrete is used. In this embodiment, the hydraulic pump 72, the variable speed motor 73, and the like constitute a drive mechanism that drives the actuator 75.

  The variable speed motor 73 is connected to an inverter device 76 as a control amount adjusting mechanism. The inverter device 76 changes the rotation speed (the number of rotations per unit time) of the variable speed motor 73 in accordance with 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 oil discharge amount of the hydraulic pump 72 is adjusted, and the work amount of the actuator 75, that is, the supply amount of the ready concrete of the grout pump is adjusted. ing.

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

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

Next, the two-way communication operation system 10 of the wireless communication method for remotely controlling the industrial machine 70 will be described.
The two-way communication operation system 10 includes an operation side terminal 11 that transmits various operation commands and an operation command transmitted from the operation side terminal 11 and a wireless “communication state data”. ”Etc., and the machine side terminal 50 is configured. First, the operation side terminal 11 will be described.

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

  Each MCU has a central processing unit (CPU) that performs various types of arithmetic processing, a read-only read-only memory (ROM) that stores various processing programs, and random access that can read and write various data. A memory (RAM) is 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 an operation-side wireless transmission unit.

  In addition, after the various operation commands are transmitted from the operation side terminal 11, a predetermined time is stored in a 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 when there is no retransmission request within a predetermined time, the operation command is deleted.

  The second wireless unit 17 receives various signals from the machine side terminal 50 via the antenna 19. The second radio unit 17 includes an RSSI measurement unit 18 that measures the radio signal strength (RSSI value) transmitted from the machine-side terminal 50. The second wireless unit 17 corresponds to an operation side wireless reception unit. The RSSI measurement unit 18 corresponds to an operation side reception intensity 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 on switch 21 is an operation switch for turning on power (not shown) in various circuits of the operation side terminal 11. 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 direction of increasing, increases the rotational speed of the variable speed motor 73, increases the discharge amount of the hydraulic pump 72, and gradually increases the work amount of the actuator 75. This is an operation switch for increasing the speed.

  Each time the speed increasing switch 25 is turned on once after the power-on switch 21 and the operation switch 23 are turned on, an operation command (that is, a speed increasing command) is transmitted via the first wireless unit 14 by the MCU 13. Sent. Thus, based on the operation command received by the machine side terminal 50, the frequency of the inverter device 76 of the industrial machine 70 is increased by about 0.2 Hz within a range of 0 to 60 Hz, and the rotational speed of the variable speed motor 73 is increased. Is continuously increased in small increments. Further, when the speed increasing switch 25 is kept in the on state, the frequency is rapidly increased by the MCU 13.

  Each time the deceleration switch 26 is turned on once after the power-on switch 21 and the operation switch 23 are turned on, an operation command (that is, a deceleration command) is transmitted via the first wireless unit 14 by the MCU 13. Is done. Thereby, based on the operation command received by the machine side terminal 50, the frequency of the inverter device 76 of the industrial machine 70 is decreased by about 0.2 Hz within the range of 0 to 60 Hz, and the rotational speed of the variable speed motor 73 is reduced. Is decelerated continuously in small increments. Further, when the deceleration switch 26 is kept on, the frequency is rapidly reduced.

  As shown in FIGS. 2A and 2B, the display 30 has a display area 31. The display area 31 includes a rotation speed display area 32 of the variable speed motor 73, an operation terminal side reception sensitivity display area 33, a pressure display area 34, a communication state data display area 36, a reception sensitivity level display area 38, and FIG. It has a non-reception state display area 39 shown. The rotation speed display area 32 is an area for displaying the rotation speed of the variable speed motor 73. The operation terminal side reception sensitivity display area 33 is an area for displaying the radio signal intensity transmitted from the machine side terminal 50 measured by the RSSI measurement unit 18 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 status data display area 36 is a display area indicating the result of monitoring performed on the machine side terminal 50 for wireless communication from the operation side terminal 11. The reception sensitivity level display area 38 is an area for displaying a level of the reception sensitivity at the machine side terminal 50 for wireless communication from the operation side terminal 11. The non-reception state display area 39 is a display area for displaying a state where the operation side terminal 11 is not receiving through wireless communication with the machine side terminal 50.

  As shown in FIG. 2A, the status display unit 40 includes a power lamp 41, a wireless lamp 43, and a pressure abnormality lamp 47, and the lamps are arranged in rows in the vertical direction. Each lamp is composed of, for example, an LED (light emitting diode), but is not limited to an LED.

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

  The abnormal pressure lamp 47 is turned on by the MCU 16 when the power-on switch 21 is on and the received “operation state information (hydraulic pressure)” is an abnormal value, and the operation side terminal 11 is turned on. The light is turned off. In this embodiment, the MCU 16 determines whether or not the “operation state information (hydraulic pressure)” is an abnormal value by comparing with the reference value. However, the MCU 60 described later performs an abnormality determination on the machine side terminal 50 side. Then, 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, the case 51 contains a receiving MCU 52, a third wireless unit 54, an output unit 58, a transmitting MCU 60, a fourth wireless unit 62, and a power source (not shown). Each MCU has a central processing unit (CPU) that performs various arithmetic processes, a read-only read-only memory (R0M) that stores various processing programs, and a random access that can read and write various data. A memory (RAM) is provided. The MCUs 52 and 60 correspond to a monitoring unit and a situation grasping unit.

  The third wireless unit 54 receives various operation commands from the operation side terminal 11 via the antenna 55. The third wireless unit 54 includes an RSSI measurement unit 56 that measures the wireless signal strength (RSSI value) transmitted from the operation side terminal 11. The RSSI measuring unit 56 corresponds to a machine side received intensity measuring unit and a 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 a machine-side wireless reception unit.

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

(Operation of the embodiment)
Next, the operation of the bidirectional communication operation system 10 configured as described above will 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. In this state, it is assumed that the power-off switch 22 and the acceleration switch 25 (or the deceleration switch 26) are operated.

<Processing of MCU 13 of Operation Side Terminal 11>
FIG. 3 is a flowchart of a processing program executed by the MCU 13 at a predetermined control cycle. In S10, the MCU 13 creates communication data on the device identification numbers of the operation side terminal 11 and the machine side terminal 50 and the operation command corresponding to the operation according to a preset communication protocol, and together with the synchronization signal, the first A transmission process is performed by the wireless unit 14 via the antenna 15 and the process is temporarily terminated.

  The first wireless unit 14 transmits using a carrier wave 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 can be used by a radio station that does not require a license.

<Processing 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.

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

  In S <b> 44, the MCU 52 performs an error check whether the device identification numbers of the operation side terminal 11 and the machine side terminal 50 obtained in the “input processing” are consistent with the respective identification numbers stored in the MCU 52, and Then, an error check such as consistency between the synchronization signal and the synchronization signal reference data stored in the MCU 52 in advance is performed. Since the error check method may be a known method, detailed description thereof is 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.
In 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.

In S <b> 48, the MCU 52 outputs an operation command to the output unit 58.
In S50, the MCU 52 increments the error counter N.
In S52, the MCU 52 determines whether or not the error counter N is greater than or equal to 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. For example, the determination reference value Na may be “1”, “2”, or “4” or more. The determination process of S52 is to cause 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 is consistent with the device identification numbers of the operation side terminal 11 and the machine side terminal 50, but the operation command and the like. Is unknown, the MCU 60 issues a retransmission request to the operation side terminal 11 via the fourth wireless unit 62. Thereafter, there may be a case where the determination process in S44 does not have a communication error for the communication data retransmitted from the operating terminal 11 in response to the retransmission request. In consideration of such a case, the process of S52 is provided.

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

  In S56, the MCU 52 determines whether or not 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 3 seconds, but is not limited to this value, and may be another numerical value.

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

  In S62, the MCU 52 determines whether or not the total output stop time T1 is equal to or longer than the second determination reference time Tb. The MCU 52 returns to S40 if the total output stop time T1 is less than the second determination reference time Tb, and sets the determination to “YES” if the total output stop time T1 is greater than or equal to the second determination reference time Tb. The process proceeds to S64. In the present embodiment, the second determination reference time Tb is 3 seconds, but is not limited to this value, and may be another numerical value.

  In S64, the MCU 52 returns the inverter device 76 to the power-on state that is the initial operation state, and resets the error counter N, the error display time T, and the total output stop time T1 to zero.

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

  For example, as described above, when there is no communication error with respect to the communication data retransmitted in response to the retransmission request, the MCU 52 does not handle the defective process due to the communication error. In other words, in this case, the MCU 52 stores “communication state data” indicating that the communication state is normal in a storage unit (not shown) provided in the MCU 52.

  Here, a typical example of the defective process is a case where the determination in S52 is “YES”. In such a case, the MCU 52 stores “communication state data” that the communication state is an error state (defective) in a storage unit (not shown) provided in the MCU 52.

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

In S70, the MCU 60 monitors the reception state of the MCU 52.
In 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.

  Note that the MCU 52 sets a state flag indicating the reception state when in the reception state, and resets the state flag when not in the reception state. The MCU 60 determines the reception state of the MCU 52 based on the state flag.

In S74, the MCU 60 performs a Main loop operation mode process 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, the second interrupt process that is the highest priority process will be described with reference to FIG. This interruption process is performed at a predetermined control cycle. This control cycle is, for example, an interval of 100 msec, but is not limited to this value.

In S <b> 80, the MCU 60 monitors the RSSI value measured by the RSSI measurement unit 56 of the third wireless unit 54 via the MCU 52.
In S <b> 82, the MCU 60 converts the RSSI value into data so as to be suitable for transmission to be performed later, and once ends this flowchart.

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

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

  In S94, the “communication state data” is converted into data so as to be suitable for transmission performed later, and the data is stored in a storage unit (not shown) provided in the MCU 60, and then this flowchart is temporarily ended.

If there is “communication status data” indicating that the MCU 60 is in a normal state in S92, the MCU 60 proceeds to S96.
In S96, the “communication state data” is converted into data suitable for transmission to be performed later, and the data is stored in a storage unit (not shown) provided in the MCU 60, and then this flowchart is temporarily ended.

<Main loop processing>
Next, the Main loop process executed in the Main loop operation mode will be described with reference to FIG. The main loop process is performed at 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 by the MCU 52.
For example, when the operation command is a speed increase command, the inverter device 76 increases the speed of the variable speed motor 73 based on the speed increase command. Further, 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, the inverter device 76 enters a power-on state that is an initial operating state. The power-on state is a state where the power is turned on but the variable speed motor 73 is stopped. When the operation command is a stop command, the supply of electric power to the inverter device 76 is interrupted and the variable speed motor 73 is stopped.

  In S102, the MCU 60 performs sensor monitoring processing of the industrial machine 70. Specifically, “operation state information (hydraulic pressure and rotational speed)” detected by the pressure sensor 77 and the rotational speed sensor 78 of the industrial machine 70 are input.

In S <b> 104, the MCU 60 performs data processing so that the “operation state information” that is the output value of the sensor is suitable for transmission performed later.
In S106, the MCU 60 performs a connection process with the data converted into the data in the second interrupt process and the third interrupt process described above.

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

<Processing of MCU 16 of Operation Side Terminal 11>
The processing 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 executed by the MCU 16 at a predetermined control cycle.

  In S20, the MCU 16 determines whether or not there is reception from the fourth wireless unit 62 on the machine side. Here, the MCU 16 performs the same processing as the processing performed by the MCU 52 in S44 in FIG. 5. If there is no communication error as a result of the reception, the MCU 16 proceeds to S22 and there is a communication error. If there is no reception itself, the process proceeds to S26.

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

In S26, the MCU 16 causes the display 30 and the status display unit 40 to perform a display operation in an unreceived state (see FIG. 2C), and returns to S20.
FIG. 2A illustrates an example of display states of the display 30 and the status display unit 40 when the “communication state data” is in a normal state and the hydraulic pressure is normal. As shown in the figure, the rotation speed display area 32 and the pressure display area 34 of the display 30 display the rotation speed and hydraulic pressure (pressure) as the operation state information, respectively. In the communication status data display area 36, an icon indicating a normal state is displayed. The operation terminal side reception sensitivity display area 33 displays the RSSI value measured by the RSSI measurement unit 18. Further, the power lamp 41 and the wireless lamp 43 are turned on, and the pressure abnormality lamp 47 is turned off to notify 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 rotation speed display area 32 and the pressure display area 34 of the display 30 display the rotation speed and hydraulic pressure (pressure) as the operation state information, respectively. In the communication state data display area 36, an icon indicating an error state is displayed. The operation terminal side reception sensitivity display area 33 displays the RSSI value measured by the RSSI measurement unit 18. In FIG. 2B, the power lamp 41 and the wireless lamp 43 are turned on. Further, the pressure abnormality lamp 47 is turned on to notify 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 rotation speed display area 32, pressure display area 34, operation terminal side reception sensitivity display area 33, communication state data display area 36, and reception sensitivity level display area 38 of the display 30 are not displayed. Instead, “SCAN” indicating that it is waiting is displayed in the non-reception 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 abnormal lamp 47 is turned off because no reception is received from the machine side terminal 50.
Here, since the non-reception state display area 39 is displayed, the operator can understand that the reason for turning off the abnormal pressure lamp 47 is that the machine side terminal 50 is not receiving.

This embodiment has the following features.
(1) In the two-way communication operation system 10 of the present embodiment, the operation side terminal 11 transmits a first radio unit 14 (operation side radio transmission unit) that transmits an operation command by radio in a first frequency band that is a specific low power radio. ) And a second wireless unit 17 (operating-side wireless receiving unit) that receives a specific low-power wireless signal in a second frequency band different from the first frequency band. In addition, the operation side terminal 11 includes a display 30 (display unit) that displays the hydraulic pressure (operation state information) of the hydraulic pump 72 of the industrial machine 70. The machine-side terminal 50 includes a third radio unit 54 (machine-side radio reception unit) that receives radio of the first frequency band, and an output unit 58 that outputs an operation command to the subordinate industrial machine 70. Further, the operation side terminal 11 transmits the hydraulic pressure (operation state information) of the hydraulic pump 72 of the industrial machine 70 and the rotation speed (operation state information) of the variable speed motor 73 wirelessly in the second frequency band 62. (Machine-side wireless transmitter). As a result, the operation side terminal, the machine side terminal, and the bidirectional communication operation system of the present invention can obtain the operation state information on the industrial machine side, so that the work can be performed accurately and efficiently.

  Further, according to the present embodiment, since the communication state is monitored by the machine side terminal and the monitoring result (wireless communication state information) is transmitted to the operation side terminal, the wireless communication state information is transmitted to the operation side terminal. You can also get

  (2) In the present invention, the first frequency band is a 429 MHz band. As a result, this frequency band is a frequency used by a specific low-power radio station and can be used as a radio station that does not require a license.

  (3) In the present invention, the second frequency band is a 920 MHz band. As a result, this frequency band is a frequency used by a specific low-power radio station and can be used as a radio station that does not require a license.

In addition, embodiment of this invention is not limited to the said embodiment, You may change as follows.
In the above embodiment, a carrier wave of 429 MHz band is used as the first frequency band, but another frequency used in a specific low power radio station such as a 1.2 GHz band may be used as the first frequency band.

In the above embodiment, the 920 MHz band carrier wave is used as the second frequency band. However, the second frequency band may be another frequency band used in the specific low-power radio station.
In the above embodiment, the reception sensitivity level is displayed as the reception sensitivity level display area 38. However, the reception sensitivity display area may be changed to a numerical value.

  In the above embodiment, the hydraulic pressure and the rotational speed of the motor are used as the operational state information. However, the operational state information is not limited to the hydraulic pressure and the rotational speed as long as it indicates the operational state when the machine is operated. The operating state may be indicated. Moreover, although the operating state information is two in this embodiment, the number of operating state information is not limited to two, and may be one or more.

DESCRIPTION OF SYMBOLS 10 ... Two-way communication operation system, 11 ... Operation side terminal, 12 ... Case,
13 ... MPU for transmission, 14 ... first wireless unit (operating side wireless transmitter),
15 ... antenna, 16 ... MPU for reception,
17 ... 2nd wireless unit (operating side wireless receiver),
18 ... RSSI measurement part (operation side reception intensity measurement part),
19 ... Antenna, 20 ... Operation switch, 21 ... Power on switch,
22 ... Power off switch, 23 ... Run switch, 24 ... Stop switch,
25 ... Increase speed switch, 26 ... Deceleration switch,
30 ... Display (display unit), 31 ... Display area,
32 ... Rotational speed display area, 33 ... Operating terminal side reception sensitivity display area,
34 ... Pressure display area, 36 ... Received data status display area,
38 ... reception sensitivity level display area, 39 ... non-reception state display area,
40 ... Status display section, 41 ... Power light, 43 ... Wireless light,
47 ... Abnormal pressure light, 50 ... Machine side terminal, 51 ... Case,
52. MCU for reception (monitoring unit, situation grasping unit),
54 ... Third wireless unit (machine-side wireless receiver), 55 ... Antenna,
56. RSSI measuring unit (machine side received intensity measuring unit, monitoring unit),
58... Output unit, 60... MCU for transmission (monitoring unit, status grasping unit),
62 ... 4th wireless unit (machine side wireless transmission part), 63 ... Antenna,
70 ... Industrial machinery, 72 ... Hydraulic pump, 73 ... Variable speed motor,
74 ... Oil tank, 75 ... Actuator, 76 ... Inverter device,
77 ... Pressure sensor, 78 ... Rotation speed sensor,
N ... error counter, Na ... judgment reference value,
T ... error display time, Ta ... judgment reference time, T1 ... all output stop time.

Claims (9)

A bidirectional communication operation system comprising an operation side terminal and a machine side terminal,
The operation side terminal includes an operation side wireless transmission unit that transmits an operation command wirelessly in a first frequency band that is a specific low power radio, and a second frequency band that is a specific low power radio and is different from the first frequency band. An operation-side radio reception unit that receives radio; 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 radio receiving unit that receives radio of the first frequency band, an output unit that outputs the operation command to the subordinate machine, and radio of the machine in the second frequency band. A two-way communication operation system comprising a machine-side wireless transmission unit that transmits data on the machine.   The bidirectional communication operation system according to claim 1, wherein the first frequency band is a 429 MHz band or a 1.2 GHz band.   The bidirectional communication operation system according to claim 1 or 2, wherein the second frequency band is a 920 MHz band. An operation side terminal that performs two-way communication with a machine side terminal,
An operation-side wireless transmission unit that transmits an operation command by radio in a first frequency band that is a specific low-power radio, and an operation side that receives radio in a second frequency band that is a specific low-power radio and is different from the first frequency band An operation side terminal comprising: a wireless reception unit; and a display unit that displays operation state information of a machine that is an operation target of the operation command.   The operation side terminal according to claim 4, wherein the first frequency band is a 429 MHz band or a 1.2 GHz band.   The operation side terminal according to claim 4 or 5, wherein the second frequency band is a 920 MHz band. A machine side terminal that performs two-way communication with an operation side terminal,
A machine-side radio receiving unit that receives radio of the first frequency band, an output unit that outputs the received operation command to a subordinate machine, and a machine-side radio that transmits operating state information of the machine by radio of the second frequency band A machine-side terminal including a transmission unit.   The machine side terminal according to claim 7, wherein the first frequency band is a 429 MHz band or a 1.2 GHz band.   The machine side terminal according to claim 7 or 8, wherein the second frequency band is a 920 MHz band.