WO2017221354A1

WO2017221354A1 - Radio communication device, radio station device, apparatus control method, and apparatus control program

Info

Publication number: WO2017221354A1
Application number: PCT/JP2016/068544
Authority: WO
Inventors: 俊明富澤
Original assignee: 三菱電機株式会社
Priority date: 2016-06-22
Filing date: 2016-06-22
Publication date: 2017-12-28
Also published as: DE112016007002T5; JPWO2017221354A1; JP6351883B2; TW201800882A; CN109313414A

Abstract

After transmission of a notification signal has been set once, a radio interface (5) keeps transmitting the notification signal with a regular periodicity. If it is not necessary to stop a control apparatus, a radio communication unit (11) sets, in the radio interface (5), transmission of a first notification signal (81) for notifying that it is not necessary to stop the control apparatus, and, during a period in which it is not necessary to stop the control apparatus, causes the radio interface (5) to keep transmitting the first notification signal (81) to a radio station device (2) with a regular periodicity. If it becomes necessary to stop the control apparatus, the radio communication unit (11) sets, in the radio interface (5), transmission of a second notification signal (82) for notifying that it is necessary to stop the control apparatus, and causes the radio interface (5) to keep transmitting the second notification signal (82) instead of the first notification signal (81) to the radio station device (2) with a regular periodicity.

Description

RADIO COMMUNICATION DEVICE, RADIO STATION DEVICE, DEVICE CONTROL METHOD, AND DEVICE CONTROL PROGRAM

The present invention relates to a wireless communication device, a wireless station device, a device control method, and a device control program.

In the technique disclosed in Non-Patent Document 1, a battery-driven operator control terminal device performs wireless communication with a wireless station device wired to a control device to control the control device.
For example, when an emergency stop button is pressed in the operator control terminal device, the operator control terminal device transmits an emergency stop command to the wireless station device by wireless communication, and the wireless station device performs emergency control of the control device based on the emergency stop command. The stop is in progress.

Further, in the technology disclosed in Non-Patent Document 2, when the operator control terminal device periodically transmits a neutral frame to the radio station device and the pressing of the emergency stop button is detected, the operator control terminal device detects the neutral frame. Stop sending. The control device stops when the neutral frame monitoring cycle for monitoring the reception of the neutral frame has expired.

Further, as a technique for performing an emergency stop of a control device by wireless communication, there are a technique disclosed in Patent Document 1 and a technique disclosed in Patent Document 2.

Japanese Patent Laid-Open No. 10-283022 Japanese Utility Model Publication No. 03-028890

With the technology disclosed in Non-Patent Document 1, as in the following a) to c), even when the emergency stop button is pressed, the emergency stop command does not reach the radio station device and the control device cannot be stopped. There is a case.
a) The communication quality of the wireless communication path deteriorates due to electromagnetic interference or the like, and the emergency stop command does not reach the wireless station device.
b) The operator control terminal device cannot transmit the emergency stop command due to the battery low of the operator control terminal device.
c) Since the operator control terminal device is located outside the radio range, the operator control terminal device cannot transmit an emergency stop command.

In the technique disclosed in Non-Patent Document 2, when the wireless station apparatus cannot receive a neutral frame, the control device is stopped, so the problem of the technique of Non-Patent Document 1 can be solved.
However, in the technique disclosed in Non-Patent Document 2, while the control device does not need to be stopped, the operator control terminal device generates a neutral frame for notifying the radio station device that the control device is not stopped at regular intervals. Need to be generated and sent. In other words, the technique disclosed in Non-Patent Document 2 has a problem that computation resources are constantly consumed in order to notify the radio station apparatus that it is not necessary to stop the control device.
Further, even the techniques described in Patent Document 1 and Patent Document 2 cannot solve the problem.

The main object of the present invention is to solve such problems. More specifically, while it is not necessary to stop the device, without consuming computing resources, the wireless station device is notified that the device does not need to be stopped, and when the device needs to be stopped, The main purpose is to reliably stop the equipment through the radio station apparatus.

A wireless communication apparatus according to the present invention
Once a transmission of a periodic signal is set, a wireless communication device including a wireless interface that continues to transmit the periodic signal at a constant period,
When it is not necessary to stop the device, the wireless interface is set to transmit the first periodic signal that is a periodic signal notifying that the device does not need to be stopped. A first controller that continues to transmit the first periodic signal from the wireless interface to the wireless station device capable of stopping the device at the fixed period;
When the device needs to be stopped, transmission of a second periodic signal, which is a periodic signal for notifying that the device needs to be stopped, is set in the wireless interface, and the first interface is set in the wireless interface. A periodic signal switching control for continuously transmitting the second periodic signal to the wireless station device at the fixed period, and a periodic signal for stopping transmission of the first periodic signal from the wireless interface. A second control unit that performs any one of the stop controls.

In the present invention, when it is not necessary to stop the device, the first periodic signal is transmitted from the wireless interface to the wireless station apparatus while the device is not stopped by setting the transmission of the first periodic signal to the wireless interface. Continue to be sent. For this reason, it is possible to notify the radio station apparatus that it is not necessary to stop the device without consuming computing resources while the device is not stopped. In addition, when it is necessary to stop the device, the device can be reliably stopped through the wireless station device by control to switch to transmission of the second periodic signal or control to stop transmission of the first periodic signal. .

FIG. 3 is a diagram illustrating an example of a system configuration according to the first embodiment. FIG. 3 is a diagram illustrating a configuration example of an operator control terminal device according to the first embodiment. FIG. 3 shows a configuration example of a radio station apparatus according to the first embodiment. FIG. 3 shows an operation sequence according to the first embodiment. FIG. 3 shows an operation sequence according to the first embodiment. FIG. 3 is a flowchart showing an operation example of the operator control terminal device according to the first embodiment. FIG. 3 is a flowchart showing an operation example of the radio station apparatus according to the first embodiment. FIG. 9 shows an operation sequence according to the second embodiment. The flowchart figure which shows the operation example of the operator control terminal device which concerns on Embodiment 2. FIG. FIG. 9 is a flowchart showing an operation example of a radio station apparatus according to the second embodiment. FIG. 10 shows an operation sequence according to the third embodiment. FIG. 10 shows an operation sequence according to the third embodiment. FIG. 9 is a flowchart showing an operation example of the operator control terminal device according to the third embodiment. FIG. 9 is a flowchart showing an operation example of a radio station apparatus according to the third embodiment. FIG. 10 shows an operation sequence according to the fourth embodiment. FIG. 10 shows an operation sequence according to the fourth embodiment. FIG. 9 is a flowchart showing an operation example of an operator control terminal device according to a fourth embodiment. FIG. 9 is a flowchart showing an operation example of a radio station apparatus according to the fourth embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments and drawings, the same reference numerals denote the same or corresponding parts.

Embodiment 1 FIG.
*** Explanation of configuration ***
FIG. 1 shows a system configuration example according to the present embodiment.

The operator control terminal device 1 is a wireless communication device. The operator control terminal device 1 includes an emergency stop button 4 and a wireless interface 5. The emergency stop button 4 is pushed down by the operator when an emergency stop of the control device 3 is necessary.
The wireless interface 5 includes an antenna for transmitting a notification signal (beacon frame) 8 and an RF (Radio Frequency) circuit. Once the wireless interface 5 sets the transmission of the notification signal (beacon frame) 8, the wireless interface 5 continues to transmit the notification signal (beacon frame) 8 at a constant period thereafter.
Before the emergency stop button 4 is pushed down, that is, when the emergency stop of the control device 3 is unnecessary, the operator control terminal device 1 notifies that the emergency stop of the control device 3 is not required as shown in FIG. The transmission of the notification signal (beacon frame) 8 to which the steady notification 7 is added is set in the wireless interface 5. As a result, while the emergency stop of the control device 3 is unnecessary, the notification signal (beacon frame) 8 to which the steady notification 7 is added is continuously transmitted from the wireless interface 5 at a constant cycle. Hereinafter, the notification signal (beacon frame) 8 to which the steady notification 7 is added is referred to as a first notification signal (beacon frame) 81.
On the other hand, when the emergency stop button 4 is pushed down and an emergency stop of the control device 3 is required, the operator control terminal device 1 transmits a notification signal (beacon frame) 8 from which the steady notification 7 is deleted. Set to the wireless interface 5. Thereafter, the notification signal (beacon frame) 8 from which the steady notification 7 is deleted from the wireless interface 5 is continuously transmitted from the wireless interface 5 at a constant period. Hereinafter, the notification signal (beacon frame) 8 from which the steady notification 7 is deleted is referred to as a second notification signal (beacon frame) 82. When there is no need to distinguish between the first notification signal (beacon frame) 81 and the second notification signal (beacon frame) 82, both are collectively referred to as the notification signal (beacon frame) 8. The operation performed by the device 1 corresponds to a device control method.

The radio station device 2 is connected to the control device 3 and performs an emergency stop of the control device 3. The radio station apparatus 2 includes a radio interface 6 and a device interface 9.
The wireless station device 2 receives the notification signal (beacon frame) 8 transmitted from the operator control terminal device 1 via the wireless interface 6, and whether the notification signal (beacon frame) 8 includes the steady notification 7 or not. Determine. While the regular notification 7 is included in the notification signal (beacon frame) 8, the emergency stop of the control device 3 is not performed. On the other hand, when the notification signal (beacon frame) 8 does not include the steady notification 7, the wireless station device 2 performs an emergency stop of the control device 3 via the wireless interface 6.
The wireless interface 6 includes an antenna and an RF circuit for receiving a notification signal (beacon frame) 8.
The device interface 9 is a circuit that serves as an interface with the control device 3.
The operation performed by the radio station apparatus 2 also corresponds to the device control method.

FIG. 2 shows an internal configuration example of the operator control terminal device 1.
The operator control terminal device 1 includes a processor 901, a storage device 902, a timer 903, a display 904, and a battery 905 as hardware configurations. The operator control terminal device 1 is a computer.
The storage device 902 stores programs that realize the functions of the stop monitoring unit 10, the wireless communication unit 11, and the display unit 13. The processor 901 reads out a program that realizes the stop monitoring unit 10, the wireless communication unit 11, and the display unit 13 from the storage device 902, and executes the program, thereby the stop monitoring unit 10, the wireless communication unit 11, and the display unit 13. Operate. In particular, a program that realizes the functions of the stop monitoring unit 10 and the wireless communication unit 11 corresponds to a device control program.
The timer 903 measures time.
The display 904 displays display information for controlling the control device 3.
The battery 905 supplies power to the operator control terminal device 1.
The processor 901 measures the transmission cycle of the notification signal (beacon frame) 8 by software control, but the processor 901 measures the transmission cycle of the notification signal (beacon frame) 8 by multiplying the time measured by the timer 903 by a constant. For example, when the transmission cycle of the notification signal (beacon frame) 8 is 100 ms and the time measured by the timer 903 is 10 ms, the processor 901 can multiply the measurement time of the timer 903 by 10 (10 counts). The transmission cycle of the notification signal (beacon frame) 8 is measured.
The operator control terminal device 1 may be provided with dedicated hardware for measuring the transmission cycle of the notification signal (beacon frame) 8.

The stop monitoring unit 10 monitors whether or not the emergency stop button 4 is pushed down. That is, the stop monitoring unit 10 determines whether or not an emergency stop of the control device 3 is necessary.

When the emergency stop button 4 is not pressed down, that is, when the emergency stop of the control device 3 is not required, the wireless communication unit 11 notifies the first notification signal (notifying that the control device 3 does not need to be stopped) ( The transmission of the beacon frame 81 is set in the wireless interface 5. As a result, while the emergency stop of the control device 3 is unnecessary, the first notification signal (beacon frame) 81 is continuously transmitted from the wireless interface 5 at a constant cycle. The first notification signal (beacon frame) 81 corresponds to a first periodic signal. The steady notification 7 corresponds to notification information.
In addition, when the emergency stop button 4 is pressed down, that is, when the emergency stop of the control device 3 is necessary, the wireless communication unit 11 replaces the first notification signal (beacon frame) 81 with the control device 3 is set in the wireless interface 5 to transmit the second notification signal (beacon frame) 82 for notifying that the emergency stop 3 is necessary. As a result, the second notification signal (beacon frame) 82 is continuously transmitted from the wireless interface 5 at a constant period. The second notification signal (beacon frame) 82 corresponds to a second periodic signal. In addition, instead of the first notification signal (beacon frame) 81, transmission of the second notification signal (beacon frame) 82 is set in the wireless interface 5, and the wireless station device 2 of the second notification signal (beacon frame) 82 is set. Control that causes the wireless interface 5 to continue transmission to is called periodic signal switching control.
The wireless communication unit 11 corresponds to a first control unit and a second control unit. The operation performed by the wireless communication unit 11 corresponds to a first control process and a second control process.

When the wireless communication unit 11 sets the frame format of the notification signal (beacon frame) 8 in the wireless interface 5, the notification signal (beacon frame) 8 according to the frame format is transmitted from the wireless interface 5 at a constant period.
For example, when the wireless interface 5 is compatible with a wireless LAN (Local Area Network), the wireless communication unit 11 sets the access point and the frame format of the notification signal (beacon frame) 8 for the wireless interface 5. The radio interface 5 periodically transmits a notification signal (beacon frame) 8 according to the set frame format to the radio station apparatus 2 via the access point.
That is, when the emergency stop of the control device 3 is not required, the wireless communication unit 11 sets the frame format of the first notification signal (beacon frame) 81 in the wireless interface 5 so that the emergency stop of the control device 3 is prevented. While unnecessary, the second broadcast signal (beacon frame) 82 can be periodically transmitted to the wireless station device 2 through the wireless interface 5. For this reason, the processor 901 can notify the radio station apparatus 2 that the control device 3 does not need to be stopped without consuming computing resources while the emergency stop of the control device 3 is not required.
On the other hand, when the emergency stop button 4 is pressed down, the wireless communication unit 11 sets the frame format of the second notification signal (beacon frame) 82 to the wireless interface 5, thereby The notification signal (beacon frame) 82 can be continuously transmitted to the radio station apparatus 2 periodically.
Hereinafter, setting the frame format of the first notification signal (beacon frame) 81 in the wireless interface 5 is referred to as setting transmission of the first notification signal (beacon frame) 81. Setting the frame format of transmission of the second notification signal (beacon frame) 82 in the wireless interface 5 is referred to as setting transmission of the second notification signal (beacon frame) 82. For example, when the wireless interface 5 is compatible with a wireless LAN, the wireless communication unit 11 transmits the notification signal described in “IEEE Std 802.11 ^TM- 2012 Part 11 8.4.2” (reference document). The transmission of the first notification signal (beacon frame) 81 is set by extending the Information Element of the beacon frame. In addition, the wireless communication unit 11 sets “transmission of the second notification signal (beacon frame) 82 by deleting the information element.
References:
IEEE Std 802.11 ^TM -2012 Part 11: Wireless
LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications 8.4.2 Information elements P474

The display unit 13 outputs display information used for control of the control device 3 to the display 904.

FIG. 4 shows an internal configuration example of the radio station apparatus 2.
The radio station apparatus 2 includes a processor 911, a storage device 912, a timer 913, and a counter 914 as a hardware configuration. The radio station apparatus 2 is a computer.
The storage device 912 stores programs that realize the functions of the wireless communication unit 15 and the stop control unit 16. The processor 911 operates as the wireless communication unit 15 and the stop control unit 16 by reading a program that implements the wireless communication unit 15 and the stop control unit 16 from the storage device 912 and executing the program. A program that realizes the functions of the wireless communication unit 15 and the stop control unit 16 also corresponds to a device control program.
The timer 913 measures time.
The counter 914 counts the number of times that the first notification signal (beacon frame) 81 has not been received.
The processor 911 measures the reception cycle of the notification signal (beacon frame) 8 by software control. The processor 911 measures the reception cycle of the notification signal (beacon frame) 8 by multiplying the time measured by the timer 913 by a constant. For example, if the reception period of the notification signal (beacon frame) 8 is 100 ms and the time measured by the timer 913 is 10 ms, the processor 911 multiplies the measurement time of the timer 913 by 10 (10 counts). The reception cycle of the notification signal (beacon frame) 8 is measured.
The radio station device 2 may include dedicated hardware for measuring the reception cycle of the notification signal (beacon frame) 8.

The wireless communication unit 15 receives the first notification signal (beacon frame) 81 or the second notification signal (beacon frame) 82. The wireless communication unit 15 corresponds to a receiving unit. The operation performed by the wireless communication unit 15 corresponds to reception processing.

The stop control unit 16 urgently stops the control device 3 when the wireless communication unit 15 receives the second notification signal (beacon frame) 82. The stop control unit 16 also makes the control device 3 stop urgently even when the wireless communication unit 15 has not received the first notification signal (beacon frame) 81 for a predetermined time.
For example, when the communication quality of the wireless communication path deteriorates due to electromagnetic interference or the like, and the first notification signal (beacon frame) 81 does not reach the wireless station device 2, the stop control unit 16 makes the control device 3 emergency stop. . Further, even when the operator control terminal device 1 cannot transmit the first notification signal (beacon frame) 81 due to the battery of the operator control terminal device 1 being low, the stop control unit 16 makes the control device 3 stop urgently. Further, even when the operator control terminal apparatus 1 cannot transmit the first notification signal (beacon frame) 81 because the operator control terminal apparatus 1 is located outside the radio range, the stop control unit 16 makes the control device 3 stop urgently. .
The operation performed by the stop control unit 16 corresponds to a stop control process.

*** Explanation of operation ***
Referring to FIG. 4, the operation sequence of operator control terminal device 1 and radio station device 2 before emergency stop button 4 is pressed down, and the operator control terminal device 1 and radio station device after emergency stop button 4 is pressed down The operation sequence 2 will be described.

Before the emergency stop button 4 is pressed down, in the operator control terminal device 1, the wireless communication unit 11 sets the transmission of the first notification signal (beacon frame) 81 to the wireless interface 5. For this reason, the first notification signal (beacon frame) 81 including the steady notification 7 is transmitted from the wireless interface 5 to the wireless station apparatus 2 at a constant transmission cycle.
In the wireless station device 2, the wireless communication unit 15 is activated at a reception cycle corresponding to the transmission cycle at the operator control terminal device 1. Then, the wireless communication unit 15 receives the first notification signal (beacon frame) 81 via the wireless interface 6. Then, the wireless communication unit 15 extracts the steady notification 7 from the first notification signal (beacon frame) 81. Since the wireless communication unit 15 can extract the steady notification 7 from the first notification signal (beacon frame) 81, the control device 3 is not urgently stopped.

When the emergency stop button 4 is pushed down, in the operator control terminal device 1, the stop monitoring unit 10 detects that the emergency stop button 4 is pushed down. Then, the stop monitoring unit 10 outputs to the wireless communication unit 11 a steady notification deletion instruction 18 that instructs setting of transmission of the second notification signal (beacon frame) 82. The wireless communication unit 11 sets transmission of the second notification signal (beacon frame) 82 to the wireless interface 5 according to the steady notification deletion instruction 18 (steady notification deletion 19). As a result, a second notification signal (beacon frame) 82 that does not include the steady notification 7 is transmitted from the wireless interface 5 to the wireless station device 2.
In the wireless station device 2, the wireless communication unit 15 receives the second notification signal (beacon frame) 82 via the wireless interface 6. In this case, the wireless communication unit 15 cannot extract the steady notification 7 from the second notification signal (beacon frame) 82. For this reason, the wireless communication unit 15 outputs a stop signal instruction 20 to the stop control unit 16. The stop control unit 16 transmits a stop signal 21 to the control device 3 via the device interface 9 based on the stop signal instruction 20 to urgently stop the control device 3 (emergency stop 22).

FIG. 5 shows an operation sequence of the wireless station device 2 when the first notification signal (beacon frame) 81 does not reach the wireless station device 2.

In the example of FIG. 5, the wireless interface 5 of the operator control terminal device 1 transmits the first notification signal (beacon frame) 81. For example, due to deterioration of the communication quality of the wireless communication path due to electromagnetic interference or the like, 1 notification signal (beacon frame) 81 does not reach the radio station apparatus 2. The wireless communication unit 15 uses the counter 914 to count the number of times that the first notification signal (beacon frame) 81 has not been received. When the first notification signal (beacon frame) 81 is not received N times (N ≧ 2) continuously, the wireless communication unit 15 outputs a stop signal instruction 20 to the stop control unit 16. The stop control unit 16 transmits a stop signal 21 to the control device 3 via the device interface 9 based on the stop signal instruction 20 to urgently stop the control device 3 (emergency stop 22).

Next, an operation example of the wireless communication unit 11 of the operator control terminal device 1 will be described with reference to FIG.

The wireless communication unit 11 determines whether or not the steady notification deletion instruction 18 is output from the stop monitoring unit 10 (step S21).
When the steady notification deletion instruction 18 is not output (NO in step S21), the wireless communication unit 11 transmits the first notification signal (beacon frame) 81 in which the steady notification 7 is added to the wireless interface 5. Is set (step S22). If transmission of the first notification signal (beacon frame) 81 has already been set for the wireless interface 5, the wireless communication unit 11 omits step S22.

On the other hand, when the steady notification deletion instruction 18 is output (YES in step S21), the wireless communication unit 11 transmits the second notification signal (beacon frame) 82 from which the steady notification 7 is deleted to the wireless interface 5. Transmission is set (step S23).

Thus, when the emergency stop of the control device 3 is unnecessary, the wireless communication unit 11 is a first notification signal (beacon frame) 81 that is a periodic signal for notifying that the emergency stop of the control device 3 is not required. Is set to the wireless interface 5. Thereby, the radio communication unit 11 keeps the radio station device 2 transmitting the first notification signal (beacon frame) 81 at a constant cycle from the radio interface 5 while the emergency stop of the control device 3 is unnecessary. Can do.
On the other hand, when the emergency stop of the control device 3 is required, the wireless communication unit 11 is a second notification signal (beacon frame) 82 that is a periodic signal notifying that the emergency stop of the control device 3 is required. Is set to the wireless interface 5. As a result, the wireless communication unit 11 causes the wireless interface device 5 to continue to transmit the second notification signal (beacon frame) 82 to the wireless station device 2 at a constant period instead of the first notification signal (beacon frame) 81. Can do. The control for causing the wireless interface 5 to switch from the first notification signal (beacon frame) 81 to the second notification signal (beacon frame) 82 is referred to as periodic signal switching control. In the present embodiment, the radio communication unit 11 performs periodic signal switching control when the control device 3 needs to be urgently stopped.

Next, an operation example of the wireless communication unit 15 of the wireless station device 2 will be described with reference to FIG.

The wireless communication unit 15 is activated at the reception cycle of the notification signal (beacon frame) 8. More specifically, the reception cycle is set in the timer 913, and when the timer 913 expires, the wireless communication unit 15 is activated by the timer 913.
When the wireless communication unit 15 is activated and receives the notification signal (beacon frame) 8 via the wireless interface 6 (YES in step S31), does the received notification signal (beacon frame) 8 include the steady notification 7? It is determined whether or not (step S32). That is, the wireless communication unit 15 determines whether the received notification signal (beacon frame) 8 is the first notification signal (beacon frame) 81 or the second notification signal (beacon frame) 82.

If the received notification signal (beacon frame) 8 is the first notification signal (beacon frame) 81 (YES in step S32), the wireless communication unit 15 initializes the counter 914 (step S33).

On the other hand, if the received notification signal (beacon frame) 8 is the second notification signal (beacon frame) 82 (NO in step S32), the wireless communication unit 15 determines that the emergency stop button 4 has been pressed and stops. A stop signal instruction 20 is output to the control unit 16 (step S34).

When the notification signal (beacon frame) 8 is not received in step S31 (NO in step S31), the wireless communication unit 15 has not received the notification signal (beacon frame) 8 continuously (N ≧ 2) N times. It is determined whether or not (step S35).

When the notification signal (beacon frame) 8 has not been received N times consecutively (YES in step S35), it is determined that the notification signal (beacon frame) 8 from the operator control terminal device 1 has not arrived, and stop control is performed. The stop signal instruction 20 is output to the unit 16 (step S36).

On the other hand, when the number of times the notification signal (beacon frame) 8 has not been received is less than N (NO in step S35), the wireless communication unit 15 adds one value to the counter 914 (step S37).

*** Explanation of the effect of the embodiment ***
In the present embodiment, when the emergency stop of the control device 3 is not required, by setting the transmission of the first notification signal (beacon frame) 81 to the wireless interface 5, the emergency stop of the control device 3 is unnecessary. The first notification signal (beacon frame) 81 is continuously transmitted from the wireless interface 5 to the wireless station device 2. For this reason, while the emergency stop of the control device 3 is not required, the radio station apparatus 2 can be notified that the emergency stop of the control device 3 is not required without consuming the computation resources of the processor 901.
Further, in the present embodiment, when the control device 3 needs to be urgently stopped, the control device 3 is surely connected through the radio station device 2 by the control for switching to the transmission of the second notification signal (beacon frame) 82. Emergency stop can be made.

Further, the technique of Non-Patent Document 2 requires a function for terminating the neutral frame in the control device 3, and there is a problem that resources required for the control device 3 increase. In the present embodiment, since the notification signal (beacon frame) 8 is terminated at the radio station apparatus 2, there is no need to change the control device 3.
Further, even after the control device 3 is urgently stopped by transmission of the second notification signal (beacon frame) 82, the operator control terminal device 1 and the radio station device 2 are connected by a radio link. 1 can monitor the state of the control device 3 that has been urgently stopped via the wireless station device 2.

Embodiment 2. FIG.
In the present embodiment, when the emergency stop button 4 is pushed down, the operator control terminal device 1 intentionally stops the transmission of the notification signal (beacon frame) 8.
In the present embodiment, as in the first embodiment, the notification signal (beacon frame) 8 is distinguished as a first notification signal (beacon frame) 81 and a second notification signal (beacon frame) 82. It has not been. That is, in the present embodiment, only the notification signal (beacon frame) 8 that does not include the steady notification 7 is transmitted from the operator control terminal device 1 to the radio station device 2.
In the present embodiment, a notification signal (beacon frame) 8 is transmitted from the wireless interface 5 to the wireless station device 2 while the emergency stop of the control device 3 is not necessary. The wireless station device 2 determines that the emergency stop of the control device 3 is unnecessary while the notification signal (beacon frame) 8 is received. That is, in the present embodiment, the notification signal (beacon frame) 8 corresponds to the first periodic signal.
When the emergency stop of the control device 3 becomes necessary and the emergency stop button 4 is pushed down, the operator control terminal device 1 stops transmitting the notification signal (beacon frame) 8 from the wireless interface 5. Since the radio station apparatus 2 no longer receives the notification signal (beacon frame) 8, it is determined that an emergency stop of the control device 3 is necessary, and the control device 3 is stopped urgently.

*** Explanation of configuration ***
The system configuration according to the present embodiment is as shown in FIG.
Moreover, the structural example of the operator control terminal device 1 which concerns on this Embodiment is as having shown in FIG. In the present embodiment, the wireless communication unit 11 stops the transmission of the notification signal (beacon frame) 8 from the wireless interface 5 when the emergency stop button 4 is pressed down. Components other than the wireless communication unit 11 perform the same operation as in the first embodiment.
Moreover, the example of a structure of the radio station apparatus 2 which concerns on this Embodiment is as having shown in FIG. The components of the radio station apparatus 2 perform the same operation as in the first embodiment.

*** Explanation of operation ***
Referring to FIG. 8, the operation sequence of operator control terminal apparatus 1 and radio station apparatus 2 before emergency stop button 4 is pressed down, and the operator control terminal apparatus 1 and radio station apparatus after emergency stop button 4 is pressed down The operation sequence 2 will be described.

Before the emergency stop button 4 is pushed down, in the operator control terminal device 1, the wireless communication unit 11 sets the transmission of the notification signal (beacon frame) 8 to the wireless interface 5. For this reason, a notification signal (beacon frame) 8 is transmitted from the wireless interface 5 to the wireless station device 2 at a constant transmission cycle.
In the wireless station device 2, the wireless communication unit 15 is activated at a reception cycle corresponding to the transmission cycle at the operator control terminal device 1. Then, the wireless communication unit 15 receives the notification signal (beacon frame) 8 through the wireless interface 6. Since the wireless communication unit 15 has received the notification signal (beacon frame) 8, the emergency stop of the control device 3 is not performed.

When the emergency stop button 4 is pushed down, in the operator control terminal device 1, the stop monitoring unit 10 detects that the emergency stop button 4 is pushed down. Then, the stop monitoring unit 10 outputs a notification signal (beacon frame) stop instruction 40 that instructs to stop transmission of the notification signal (beacon frame) 8 to the wireless communication unit 11. The wireless communication unit 11 stops transmission of the notification signal (beacon frame) 8 from the wireless interface 5 according to the notification signal (beacon frame) stop instruction 40 (notification signal (beacon frame) stop 41). As a result, transmission of the notification signal (beacon frame) 8 from the wireless interface 5 stops.
In the wireless station device 2, since the transmission of the notification signal (beacon frame) 8 is stopped in the operator control terminal device 1, the wireless communication unit 15 does not receive the notification signal (beacon frame) 8. The wireless communication unit 15 uses the counter 914 to count the number of times that the notification signal (beacon frame) 8 has not been received. When the notification signal (beacon frame) 8 is not received N times (N ≧ 2) continuously, the wireless communication unit 15 outputs a stop signal instruction 20 to the stop control unit 16. The stop control unit 16 transmits a stop signal 21 to the control device 3 via the device interface 9 based on the stop signal instruction 20 to urgently stop the control device 3 (emergency stop 22).

The wireless communication unit 11 determines whether or not the notification signal (beacon frame) stop instruction 40 is output from the stop monitoring unit 10 (step S41), and when the notification signal (beacon frame) stop instruction 40 is not output ( No in step S41) sets the transmission of the notification signal (beacon frame) 8 to the wireless interface 5 (step S42). Note that if the transmission of the notification signal (beacon frame) 8 has already been set in the wireless interface 5, the wireless communication unit 11 omits step S42.

On the other hand, when the notification signal (beacon frame) stop instruction 40 is output (YES in step S41), the wireless communication unit 11 instructs the wireless interface 5 to stop transmitting the notification signal (beacon frame) 8. (Step S43). Thereby, the transmission of the notification signal (beacon frame) 8 from the wireless interface 5 is stopped.

In this way, when the emergency stop of the control device 3 is unnecessary, the wireless communication unit 11 transmits a notification signal (beacon frame) 8 that is a periodic signal for notifying that the emergency stop of the control device 3 is unnecessary. Set to the wireless interface 5. Thereby, the radio communication unit 11 can keep the radio station apparatus 2 transmitting the notification signal (beacon frame) 8 from the radio interface 5 at a constant period while the emergency stop of the control device 3 is unnecessary. .
On the other hand, when the emergency stop of the control device 3 becomes necessary, the wireless communication unit 11 instructs the wireless interface 5 to stop transmission of the notification signal (beacon frame) 8. Thereby, the wireless communication part 11 can stop transmission of the alerting signal (beacon frame) 8 from the wireless interface 5. Control for stopping transmission of the notification signal (beacon frame) 8 from the wireless interface 5 is referred to as periodic signal stop control. In the present embodiment, the radio communication unit 11 performs periodic signal stop control when an emergency stop of the control device 3 becomes necessary.

Also in the present embodiment, the wireless communication unit 15 is activated at the reception cycle of the notification signal (beacon frame) 8. More specifically, the reception cycle is set in the timer 913, and when the timer 913 expires, the wireless communication unit 15 is activated by the timer 913.
When the wireless communication unit 15 receives the notification signal (beacon frame) 8 via the wireless interface 6 (YES in step S51), the wireless communication unit 15 initializes the counter 914 (step S52).

On the other hand, when the notification signal (beacon frame) 8 is not received (NO in step S51), the wireless communication unit 15 has not received the notification signal (beacon frame) 8 continuously (N ≧ 2). It is determined whether or not (step S53).

If the notification signal (beacon frame) 8 has not been received N times in succession (YES in step S53), it is determined that the notification signal (beacon frame) 8 from the operator control terminal device 1 has not arrived, and stop control is performed. The stop signal instruction 20 is output to the unit 16 (step S54).

On the other hand, when the number of times the notification signal (beacon frame) 8 has not been received is less than N (NO in step S53), the wireless communication unit 15 adds one to the value of the counter 914 (step S55).

*** Explanation of the effect of the embodiment ***
In the present embodiment, when the emergency stop of the control device 3 is not required, by setting the transmission of the notification signal (beacon frame) 8 to the wireless interface 5, the wireless interface can be used while the emergency stop of the control device 3 is not required. 5, the notification signal (beacon frame) 8 is continuously transmitted to the wireless station device 2. For this reason, while the emergency stop of the control device 3 is not required, the radio station apparatus 2 can be notified that the emergency stop of the control device 3 is not required without consuming the computation resources of the processor 901.
Further, in the present embodiment, when the control device 3 needs to be urgently stopped, the control device 3 is surely urgently stopped through the radio station device 2 by controlling to stop transmission of the notification signal (beacon frame) 8. Can be made.

Embodiment 3 FIG.
In the present embodiment, when the emergency stop button 4 is pushed down, the operator control terminal device 1 transmits a stop instruction frame as a stop instruction signal before stopping transmission of the notification signal (beacon frame) 8. 2 to send. When the stop instruction frame reaches the radio station device 2, the operator control terminal device 1 stops transmitting the notification signal (beacon frame) 8 as in the second embodiment.
In this embodiment, a stop instruction frame transmission procedure is added to the processing procedure of the second embodiment.
As in the second embodiment, in this embodiment, the notification signal (beacon frame) 8 is distinguished as a first notification signal (beacon frame) 81 and a second notification signal (beacon frame) 82. Absent.

*** Explanation of configuration ***
The system configuration according to the present embodiment is as shown in FIG.
Moreover, the structural example of the operator control terminal device 1 which concerns on this Embodiment is as having shown in FIG. In the present embodiment, the stop monitoring unit 10 instructs the wireless communication unit 11 to transmit a stop instruction frame when the emergency stop button 4 is pressed down. The wireless communication unit 11 transmits a stop instruction frame to the wireless station device 2. Then, when the stop instruction frame reaches the wireless station device 2, the wireless communication unit 11 stops the transmission of the notification signal (beacon frame) 8 from the wireless interface 5. Components other than the stop monitoring unit 10 and the wireless communication unit 11 perform the same operations as those in the second embodiment.
Moreover, the example of a structure of the radio station apparatus 2 which concerns on this Embodiment is as having shown in FIG. In the present embodiment, the wireless communication unit 15 transmits a reception confirmation response to the operator control terminal device 1 when receiving the stop instruction frame. In addition, the wireless communication unit 15 instructs the stop control unit 16 to urgently stop the control device 3 by receiving the stop instruction frame. Components other than the wireless communication unit 15 perform the same operation as in the second embodiment.

*** Explanation of operation ***
Referring to FIG. 11, the operation sequence of operator control terminal apparatus 1 and radio station apparatus 2 before emergency stop button 4 is pressed down, and the operator control terminal apparatus 1 and radio station apparatus after emergency stop button 4 is pressed down The operation sequence 2 will be described.

When the emergency stop button 4 is pushed down, in the operator control terminal device 1, the stop monitoring unit 10 detects that the emergency stop button 4 is pushed down. Then, the stop monitoring unit 10 outputs a stop instruction frame transmission instruction 52 that instructs transmission of the stop instruction frame 53 to the wireless communication unit 11. The wireless communication unit 11 transmits a stop instruction frame 53 from the wireless interface 5 in accordance with the stop instruction frame transmission instruction 52.
In the wireless station device 2, the wireless communication unit 15 receives the stop instruction frame 53. Since the wireless communication unit 15 has received the stop instruction frame 53, the wireless communication unit 15 outputs a stop signal instruction 20 to the stop control unit 16. The stop control unit 16 transmits a stop signal 21 to the control device 3 via the device interface 9 based on the stop signal instruction 20 to urgently stop the control device 3 (emergency stop 22).

FIG. 12 shows an operation sequence of the operator control terminal device 1 and the radio station device 2 when the stop instruction frame 53 does not reach the radio station device 2.

In the operator control terminal device 1, the wireless communication unit 11 determines whether or not the transmission of the stop instruction frame 53 has been completed, that is, whether or not the stop instruction frame 53 has reached the wireless station device 2 (“stop instruction frame transmission”). Completed? "54). More specifically, the wireless communication unit 11 determines that the stop instruction frame 53 has reached the wireless station apparatus 2 when receiving a reception confirmation response to the stop instruction frame 53 from the wireless station apparatus 2. On the other hand, when the reception confirmation response to the stop instruction frame 53 is not received from the wireless station apparatus 2, the wireless communication unit 11 determines that the stop instruction frame 53 has not reached the wireless station apparatus 2. When the stop instruction frame 53 has not arrived at the wireless station device 2, the wireless communication unit 11 stops transmission of the notification signal (beacon frame) 8 from the wireless interface 5 (notification signal (beacon frame) stop 41). As a result, transmission of the notification signal (beacon frame) 8 from the wireless interface 5 stops.
In the wireless station device 2, since the transmission of the notification signal (beacon frame) 8 is stopped in the operator control terminal device 1, the wireless communication unit 15 does not receive the notification signal (beacon frame) 8. The wireless communication unit 15 uses the counter 914 to count the number of times that the notification signal (beacon frame) 8 has not been received. When the notification signal (beacon frame) 8 is not received N times (N ≧ 2) continuously, the wireless communication unit 15 outputs a stop signal instruction 20 to the stop control unit 16. The stop control unit 16 transmits a stop signal 21 to the control device 3 via the device interface 9 based on the stop signal instruction 20 to urgently stop the control device 3 (emergency stop 22).

Next, an operation example of the wireless communication unit 11 of the operator control terminal apparatus 1 will be described with reference to FIG.

The wireless communication unit 11 determines whether or not the stop instruction frame transmission instruction 52 is output from the stop monitoring unit 10 (step S61). When the stop instruction frame transmission instruction 52 is not output (NO in step S61), the wireless communication unit 11 sets the transmission of the notification signal (beacon frame) 8 to the wireless interface 5 (step S62). If transmission of the notification signal (beacon frame) 8 has already been set for the wireless interface 5, the wireless communication unit 11 omits step S62.

On the other hand, when the stop instruction frame transmission instruction 52 is output (YES in step S61), the wireless communication unit 11 determines whether or not the stop instruction frame 53 has already been transmitted to the wireless station device 2 (step S61). S63).
If the stop instruction frame 53 has not yet been transmitted to the wireless station device 2 (NO in step S63), the wireless communication unit 11 generates the stop instruction frame 53 and wirelessly transmits the stop instruction frame 53 via the wireless interface 5. It transmits to the station apparatus 2 (step S64).
On the other hand, when the stop instruction frame 53 has already been transmitted to the wireless station device 2 (YES in step S63), the wireless communication unit 11 determines whether or not the stop instruction frame 53 has reached the wireless station device 2. (Step S65).
If the stop instruction frame 53 has not arrived at the wireless station device 2 (NO in step S65), the wireless communication unit 11 instructs the wireless interface 5 to stop transmitting the notification signal (beacon frame) 8 (step S66). . Thereby, the transmission of the notification signal (beacon frame) 8 from the wireless interface 5 is stopped.

In this way, when the emergency stop of the control device 3 is unnecessary, the wireless communication unit 11 transmits a notification signal (beacon frame) 8 that is a periodic signal for notifying that the emergency stop of the control device 3 is unnecessary. Set to the wireless interface 5. Thereby, the radio communication unit 11 can keep the radio station apparatus 2 transmitting the notification signal (beacon frame) 8 from the radio interface 5 at a constant period while the emergency stop of the control device 3 is unnecessary. .
On the other hand, when the emergency stop of the control device 3 becomes necessary, the wireless communication unit 11 transmits a stop instruction frame 53 to the wireless station device 2. If the stop instruction frame 53 has not arrived at the radio station apparatus 2 and therefore the control device 3 has not been urgently stopped, the radio communication unit 11 stops transmitting the notification signal (beacon frame) 8 to the radio interface 5. Instruct. Thereby, the wireless communication part 11 can stop transmission of the alerting signal (beacon frame) 8 from the wireless interface 5.

Also in the present embodiment, the wireless communication unit 15 is activated at the reception cycle of the notification signal (beacon frame) 8. More specifically, the reception cycle is set in the timer 913, and when the timer 913 expires, the wireless communication unit 15 is activated by the timer 913.
When the wireless communication unit 15 receives the stop instruction frame 53 via the wireless interface 6 (YES in step S71), the wireless communication unit 15 transmits a reception confirmation response of the stop instruction frame 53 to the operator control terminal device 1 (step S72). Further, the radio communication unit 15 outputs a stop signal instruction 20 to the stop control unit 16 (step S73).

On the other hand, when the stop instruction frame 53 is not received (NO in step S71) and the notification signal (beacon frame) 8 is received (YES in step S74), the wireless communication unit 15 initializes the counter 914 (step S71). S75).

On the other hand, if the notification signal (beacon frame) 8 is not received (NO in step S74), the wireless communication unit 15 has not received the notification signal (beacon frame) 8 N times (N ≧ 2) continuously. It is determined whether or not (step S76).

When the notification signal (beacon frame) 8 has not been received N times in succession (YES in step S76), it is determined that the notification signal (beacon frame) 8 from the operator control terminal device 1 has not arrived, and stop control is performed. The stop signal instruction 20 is output to the unit 16 (step S77).

On the other hand, when the number of times the notification signal (beacon frame) 8 has not been received is less than N (NO in step S76), the wireless communication unit 11 adds one value to the counter 914 (step S78).

*** Explanation of the effect of the embodiment ***
In the present embodiment, when the emergency stop of the control device 3 is not required, by setting the transmission of the notification signal (beacon frame) 8 to the wireless interface 5, the wireless interface can be used while the emergency stop of the control device 3 is not required. 5, the notification signal (beacon frame) 8 is continuously transmitted to the wireless station device 2. For this reason, while the emergency stop of the control device 3 is not required, the radio station apparatus 2 can be notified that the emergency stop of the control device 3 is not required without consuming the computation resources of the processor 901.
In the present embodiment, when the control device 3 needs to be urgently stopped, the stop instruction frame 53 is transmitted to urgently stop the control device 3. In addition, when the stop instruction frame 53 has not reached the radio station apparatus 2, the control device 3 can be surely urgently stopped through the radio station apparatus 2 by controlling the transmission of the notification signal (beacon frame) 8. .

Embodiment 4 FIG.
In the present embodiment, as in the first embodiment, a first notification signal (beacon frame) 81 and a second notification signal (beacon frame) 82 are used.
In the present embodiment, when the emergency stop button 4 is pushed down, the operator control terminal device 1 transmits a second notification signal (beacon frame) 82 instead of the first notification signal (beacon frame) 81. Before, a stop instruction frame as a stop instruction signal is transmitted to the radio station apparatus 2. When the stop instruction frame reaches the radio station apparatus 2, the operator control terminal apparatus 1 starts transmitting the notification signal (beacon frame) 82 as in the first embodiment.
In this embodiment, a stop instruction frame transmission procedure is added to the processing procedure of the first embodiment.

*** Explanation of configuration ***
The system configuration according to the present embodiment is as shown in FIG.
Moreover, the structural example of the operator control terminal device 1 which concerns on this Embodiment is as having shown in FIG. In the present embodiment, the stop monitoring unit 10 instructs the wireless communication unit 11 to transmit a stop instruction frame when the emergency stop button 4 is pressed down. The wireless communication unit 11 transmits a stop instruction frame to the wireless station device 2. When the stop instruction frame reaches the wireless station device 2, the wireless communication unit 11 sets the transmission of the second notification signal (beacon frame) 82 to the wireless interface 5. Components other than the stop monitoring unit 10 and the wireless communication unit 11 perform the same operation as in the first embodiment.
Moreover, the example of a structure of the radio station apparatus 2 which concerns on this Embodiment is as having shown in FIG. In the present embodiment, the wireless communication unit 15 transmits a reception confirmation response to the operator control terminal device 1 when receiving the stop instruction frame. In addition, the wireless communication unit 15 instructs the stop control unit 16 to urgently stop the control device 3 by receiving the stop instruction frame. Components other than the wireless communication unit 15 perform the same operation as in the first embodiment.

*** Explanation of operation ***
Referring to FIG. 15, the operation sequence of operator control terminal device 1 and radio station device 2 before emergency stop button 4 is depressed, and operator control terminal device 1 and radio station device after emergency stop button 4 is depressed. The operation sequence 2 will be described.

Before the emergency stop button 4 is pressed down, in the operator control terminal device 1, the wireless communication unit 11 sets the transmission of the first notification signal (beacon frame) 81 to the wireless interface 5. For this reason, the first broadcast signal (beacon frame) 81 is transmitted from the wireless interface 5 to the wireless station device 2 at a constant transmission cycle.
In the wireless station device 2, the wireless communication unit 15 is activated at a reception cycle corresponding to the transmission cycle at the operator control terminal device 1. Then, the wireless communication unit 15 receives the first notification signal (beacon frame) 81 via the wireless interface 6. Then, the wireless communication unit 15 extracts the steady notification 7 from the first notification signal (beacon frame) 81. Since the wireless communication unit 15 can extract the steady notification 7 from the first notification signal (beacon frame) 81, the control device 3 is not urgently stopped.

FIG. 16 shows an operation sequence of the operator control terminal device 1 and the wireless station device 2 when the stop instruction frame 53 does not reach the wireless station device 2.

In the operator control terminal device 1, the wireless communication unit 11 determines whether or not the transmission of the stop instruction frame 53 has been completed, that is, whether or not the stop instruction frame 53 has reached the wireless station device 2 (“stop instruction frame transmission”). Completed? "54). More specifically, the wireless communication unit 11 determines that the stop instruction frame 53 has reached the wireless station apparatus 2 when receiving a reception confirmation response to the stop instruction frame 53 from the wireless station apparatus 2. On the other hand, when the reception confirmation response to the stop instruction frame 53 is not received from the wireless station apparatus 2, the wireless communication unit 11 determines that the stop instruction frame 53 has not reached the wireless station apparatus 2. If the stop instruction frame 53 has not arrived at the radio station apparatus 2, the radio communication unit 11 sets the radio interface 5 to transmit the second notification signal (beacon frame) 82 (steady state notification deletion 19). As a result, a second notification signal (beacon frame) 82 that does not include the steady notification 7 is transmitted from the wireless interface 5 to the wireless station device 2.
In the wireless station device 2, the wireless communication unit 15 receives the second notification signal (beacon frame) 82 via the wireless interface 6. In this case, the wireless communication unit 15 cannot extract the steady notification 7 from the second notification signal (beacon frame) 82. For this reason, the wireless communication unit 15 outputs a stop signal instruction 20 to the stop control unit 16. The stop control unit 16 transmits a stop signal 21 to the control device 3 via the device interface 9 based on the stop signal instruction 20 to urgently stop the control device 3 (emergency stop 22).

The wireless communication unit 11 determines whether or not the stop instruction frame transmission instruction 52 is output from the stop monitoring unit 10 (step S81), and when the stop instruction frame transmission instruction 52 is not output (NO in step S81). The wireless interface 5 is set to transmit the first notification signal (beacon frame) 81 (step S82). Note that if the transmission of the first notification signal (beacon frame) 81 has already been set in the wireless interface 5, the wireless communication unit 11 omits step S82.

On the other hand, when the stop instruction frame transmission instruction 52 is output (YES in step S81), the wireless communication unit 11 determines whether or not the stop instruction frame 53 has already been transmitted to the wireless station device 2 (step S81). S83).
If the stop instruction frame 53 has not been transmitted to the wireless station apparatus 2 yet (NO in step S83), the wireless communication unit 11 generates the stop instruction frame 53 and wirelessly transmits the stop instruction frame 53 via the wireless interface 5. It transmits to the station apparatus 2 (step S84).
On the other hand, if the stop instruction frame 53 has already been transmitted to the wireless station device 2 (YES in step S83), the wireless communication unit 11 determines whether or not the stop instruction frame 53 has reached the wireless station device 2. (Step S85).
If the stop instruction frame 53 has not arrived at the radio station device 2 (NO in step S85), the radio communication unit 11 sets the radio interface 5 to transmit the second notification signal (beacon frame) 82 (step S85). S86). As a result, the notification signal (beacon frame) 8 transmitted from the wireless interface 5 is switched from the first notification signal (beacon frame) 81 to the second notification signal (beacon frame) 82.

Thus, when the emergency stop of the control device 3 is unnecessary, the wireless communication unit 11 is a first notification signal (beacon frame) 81 that is a periodic signal for notifying that the emergency stop of the control device 3 is not required. Is set to the wireless interface 5. Thereby, the radio communication unit 11 keeps the radio station device 2 transmitting the first notification signal (beacon frame) 81 at a constant cycle from the radio interface 5 while the emergency stop of the control device 3 is unnecessary. Can do.
On the other hand, when the emergency stop of the control device 3 becomes necessary, the wireless communication unit 11 transmits a stop instruction frame 53 to the wireless station device 2. If the stop instruction frame 53 has not arrived at the radio station apparatus 2 and, therefore, the control device 3 has not stopped urgently, the radio communication unit 11 sends a second notification signal (beacon frame) 82 to the radio interface 5. Set the transmission. As a result, the notification signal (beacon frame) 8 transmitted from the wireless interface 5 is switched from the first notification signal (beacon frame) 81 to the second notification signal (beacon frame) 82.

Also in the present embodiment, the wireless communication unit 15 is activated at the reception cycle of the notification signal (beacon frame) 8. More specifically, the reception cycle is set in the timer 913, and when the timer 913 expires, the wireless communication unit 15 is activated by the timer 913.
When the wireless communication unit 15 receives the stop instruction frame 53 via the wireless interface 6 (YES in step S91), the wireless communication unit 15 transmits a reception confirmation response of the stop instruction frame 53 to the operator control terminal device 1 (step S92). Further, the wireless communication unit 15 outputs a stop signal instruction 20 to the stop control unit 16 (step S93).

On the other hand, if the stop signal frame 53 is not received (NO in step S91) and the notification signal (beacon frame) 8 is received (YES in step S94), the wireless communication unit 15 receives the received notification signal (beacon frame). It is determined whether 8 is the first notification signal (beacon frame) 81 or the second notification signal (beacon frame) 82 (step S95).

If the received notification signal (beacon frame) 8 is the first notification signal (beacon frame) 81 (YES in step S95), the wireless communication unit 15 initializes the counter 914 (step S96).
On the other hand, if the received notification signal (beacon frame) 8 is the second notification signal (beacon frame) 82 (NO in step S95), the wireless communication unit 15 outputs a stop signal instruction 20 to the stop control unit 16 ( Step S93).

If the notification signal (beacon frame) 8 is not received (NO in step S94), the wireless communication unit 15 has not received the notification signal (beacon frame) 8 continuously (N ≧ 2). It is determined whether or not (step S97).

When the notification signal (beacon frame) 8 has not been received N times consecutively (YES in step S97), it is determined that the notification signal (beacon frame) 8 from the operator control terminal device 1 has not arrived, and stop control is performed. The stop signal instruction 20 is output to the unit 16 (step S98).

On the other hand, when the number of times the notification signal (beacon frame) 8 has not been received is less than N (NO in step S97), the wireless communication unit 11 adds one to the value of the counter 914 (step S99).

*** Explanation of the effect of the embodiment ***
In the present embodiment, when the emergency stop of the control device 3 is not required, by setting the transmission of the first notification signal (beacon frame) 81 to the wireless interface 5, the emergency stop of the control device 3 is unnecessary. The first notification signal (beacon frame) 81 is continuously transmitted from the wireless interface 5 to the wireless station device 2. For this reason, while the emergency stop of the control device 3 is not required, the radio station apparatus 2 can be notified that the emergency stop of the control device 3 is not required without consuming the computation resources of the processor 901.
In the present embodiment, when the control device 3 needs to be urgently stopped, the stop instruction frame 53 is transmitted to urgently stop the control device 3. In addition, when the stop instruction frame 53 has not reached the radio station apparatus 2, the control device 3 can be urgently stopped through the radio station apparatus 2 by controlling to switch to transmission of the second notification signal (beacon frame) 82. Can do.

As mentioned above, although embodiment of this invention was described, you may implement in combination of 2 or more among these embodiment.
Alternatively, one of these embodiments may be partially implemented.
Alternatively, two or more of these embodiments may be partially combined.
In addition, this invention is not limited to these embodiment, A various change is possible as needed.

*** Explanation of hardware configuration ***
Finally, a supplementary description of the hardware configuration of the operator control terminal device 1 and the radio station device 2 will be given.

Processors

901 and 911 are ICs (Integrated Circuits) that perform processing.
The

processors

901 and 911 are a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and the like.
The

storage devices

902 and 912 are RAM (Random Access Memory), ROM (Read Only Memory), flash memory, HDD (Hard Disk Drive), and the like.

The

storage devices

902 and 912 also store an OS (Operating System).
At least a part of the OS is executed by the

processors

901 and 911.
The processor 901 executes a program that realizes the functions of the stop monitoring unit 10, the wireless communication unit 11, and the display unit 13 while executing at least a part of the OS.
The processor 911 executes a program for realizing the functions of the wireless communication unit 15 and the stop control unit 16 while executing at least a part of the OS.
When the

processors

901 and 911 execute the OS, task management, memory management, file management, communication control, and the like are performed.
The operator control terminal device 1 may include a plurality of processors that replace the processor 901. The radio station apparatus 2 may include a plurality of processors that replace the processor 911.
In addition, information, data, signal values, and variable values indicating processing results of the stop monitoring unit 10, the wireless communication unit 11, and the display unit 13 are stored in at least one of the storage device 902, the register in the processor 901, and the cache memory. Is done.
Similarly, information, data, signal values, and variable values indicating the processing results of the wireless communication unit 15 and the stop control unit 16 are stored in at least one of the storage device 912, the register in the processor 911, and the cache memory.
A program for realizing the functions of the stop monitoring unit 10, the wireless communication unit 11, and the display unit 13 is stored in a portable storage medium such as a magnetic disk, a flexible disk, an optical disk, a compact disk, a Blu-ray (registered trademark) disk, or a DVD. May be.
Similarly, the program for realizing the functions of the wireless communication unit 15 and the stop control unit 16 may be stored in a portable storage medium such as a magnetic disk, a flexible disk, an optical disk, a compact disk, a Blu-ray (registered trademark) disk, or a DVD. Good.

In addition, the “part” of the stop monitoring unit 10, the wireless communication unit 11, the display unit 13, the wireless communication unit 15, and the stop control unit 16 may be read as “circuit” or “process” or “procedure” or “processing”. Good.
In addition, the operator control terminal device 1 and the radio station device 2 are respectively configured by a logic IC (Integrated Circuit), a GA (Gate Array), an ASIC (Application Specific Integrated Circuit), and an FPGA (Field-Programmable Gate Array Electronic Circuit). May be.
The processor and the electronic circuit are also collectively referred to as a processing circuit.

1 operator control terminal device, 2 radio station device, 3 control device, 4 emergency stop button, 5 radio interface, 6 radio interface, 7 steady notification, 8 notification signal (beacon frame), 9 device interface, 10 stop monitoring unit, 11 Wireless communication unit, 13 display unit, 15 wireless communication unit, 16 stop control unit, 18 steady notification deletion instruction, 20 stop signal instruction, 21 stop signal, 22 emergency stop, 40 notification signal (beacon frame) stop instruction, 41 notification signal (Beacon frame) stop, 52 stop instruction frame transmission instruction, 53 stop instruction frame, 81 first notification signal (beacon frame), 82 second notification signal (beacon frame), 901 processor, 902 storage device, 903 timer, 904 Display, 90 Battery, 911 a processor, 912 a storage device, 913 a timer, 914 a counter.

Claims

Once a transmission of a periodic signal is set, a wireless communication device including a wireless interface that continues to transmit the periodic signal at a constant period,
When it is not necessary to stop the device, the wireless interface is set to transmit the first periodic signal that is a periodic signal notifying that the device does not need to be stopped. A first controller that continues to transmit the first periodic signal from the wireless interface to the wireless station device capable of stopping the device at the fixed period;
When the device needs to be stopped, transmission of a second periodic signal, which is a periodic signal for notifying that the device needs to be stopped, is set in the wireless interface, and the first interface is set in the wireless interface. A periodic signal switching control for continuously transmitting the second periodic signal to the wireless station device at the fixed period, and a periodic signal for stopping transmission of the first periodic signal from the wireless interface. And a second control unit that performs any one of the stop controls.
The second controller is
When it is necessary to stop the device, a stop instruction signal for instructing to stop the device can be transmitted from the wireless interface to the wireless station device, and the wireless station device can receive the stop instruction signal. The wireless communication device according to claim 1, wherein when there is no such signal, either the periodic signal switching control or the periodic signal stop control is performed.
The first controller is
When the device stop is unnecessary, the wireless interface is set to transmit the first periodic signal, which is a periodic signal including notification information notifying that the device stop is unnecessary,
The second controller is
The wireless communication apparatus according to claim 1, wherein when performing the periodic signal switching control, transmission of a second periodic signal that is a periodic signal not including the notification information is set in the wireless interface.
A wireless station device capable of stopping a device,
A first periodic signal that is transmitted from a wireless communication apparatus that determines whether or not the device needs to be stopped and that notifies that the device does not need to be stopped and a second signal that notifies that the device needs to be stopped A receiving unit that receives one of the periodic signals of
A stop control unit for stopping the device either when the receiving unit receives the second periodic signal or when the receiving unit has not received the first periodic signal for a predetermined time; A radio station apparatus.
The receiver is
There is a case where a stop instruction signal transmitted from the wireless communication device to stop the device is received,
The stop control unit
When the receiving unit detects that the stop instruction signal has been received, the receiving unit has not received the second periodic signal, and the receiving unit has not received the first periodic signal The radio station apparatus according to claim 4, wherein the device is stopped even if the time is less than the predetermined time.
The receiver is
A periodic signal that includes notification information notifying that the device does not need to be stopped is received as the first periodic signal, and a periodic signal that does not include the notification information is used as the second periodic signal. The radio station apparatus according to claim 4 for receiving.
Once the transmission of the periodic signal is set, a wireless communication device including a wireless interface that continues to transmit the periodic signal at a constant period,
When it is not necessary to stop the device, the wireless interface is set to transmit the first periodic signal that is a periodic signal notifying that the device does not need to be stopped. Continue to transmit the first periodic signal from the wireless interface to the wireless station device capable of stopping the device at the fixed period,
When the device needs to be stopped, transmission of a second periodic signal, which is a periodic signal for notifying that the device needs to be stopped, is set in the wireless interface, and the first interface is set in the wireless interface. A periodic signal switching control for continuously transmitting the second periodic signal to the wireless station device at the fixed period, and a periodic signal for stopping transmission of the first periodic signal from the wireless interface. A device control method for performing either stop control.
The wireless station device that can stop the equipment
When it is detected that the first periodic signal that is transmitted from the wireless communication device that determines whether or not the device needs to be stopped and that the device does not need to be stopped is not received for a predetermined time, And a device control method for stopping the device in any of the cases where it is detected that the second periodic signal for notifying that the device needs to be stopped is received.
Once the transmission of the periodic signal is set, a wireless communication device including a wireless interface that continues to transmit the periodic signal at a constant period,
When it is not necessary to stop the device, the wireless interface is set to transmit the first periodic signal that is a periodic signal notifying that the device does not need to be stopped. A first control process for continuously transmitting the first periodic signal from the wireless interface to the wireless station device capable of stopping the device at the constant period;
When the device needs to be stopped, transmission of a second periodic signal, which is a periodic signal for notifying that the device needs to be stopped, is set in the wireless interface, and the first interface is set in the wireless interface. A periodic signal switching control for continuously transmitting the second periodic signal to the wireless station device at the fixed period, and a periodic signal for stopping transmission of the first periodic signal from the wireless interface. A device control program for executing a second control process for performing any one of the stop controls.
To the wireless station device that can stop the equipment,
A first periodic signal that is transmitted from a wireless communication apparatus that determines whether or not the device needs to be stopped and that notifies that the device does not need to be stopped and a second signal that notifies that the device needs to be stopped A reception process for receiving any of the periodic signals of
Either when it is detected that the second periodic signal is received by the reception process, and when it is detected that the first periodic signal is not received by the reception process for a predetermined time, A device control program for executing stop control processing for stopping the device.