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CN-116803151-B - Industrial wireless communication system

CN116803151BCN 116803151 BCN116803151 BCN 116803151BCN-116803151-B

Abstract

An industrial wireless communication system (10) is provided with a base wireless device (14) and a remote wireless device (16), the base wireless device is provided with a synchronous connection transmitting unit (25) which transmits a synchronous connection signal for synchronous connection to the remote wireless device by broadcasting with a single synchronous connection period (Tsc) which is only an integer multiple of a jump period, the synchronous connection transmitting unit sequentially switches communication frequencies for synchronization to transmit the synchronous connection signal with a plurality of communication frequencies for synchronization within one jump period, and the remote wireless device is provided with a synchronous connection receiving unit (36) which sequentially switches communication frequencies for synchronization with a switching period (Tcg) which is longer than the jump period and shorter than 2 times of the jump period, thereby performing reception processing of the synchronous connection signal with the plurality of communication frequencies for synchronization.

Inventors

  • AKI TOMOHIKO
  • OZAKI YOSHIMASA

Assignees

  • SMC 株式会社

Dates

Publication Date
20260512
Application Date
20210820
Priority Date
20210125

Claims (17)

  1. 1. An industrial wireless communication system (10) is provided with: A computer (12) for monitoring and controlling the industrial equipment; a base wireless device (14) connected to the computer via a field bus (17), and A plurality of remote wireless devices (16) provided to each of a plurality of machines (44) constituting the industrial equipment, and which communicate wirelessly with the base wireless device, The base wireless device and the remote wireless device connected in synchronization perform data transmission/reception by switching a hopping frequency at a predetermined hopping period (Tfh), characterized in that, The base wireless device has a synchronous connection transmitting section (25) that, when not synchronously connected with the remote wireless device, performs transmission processing by broadcasting, which transmits a synchronous connection signal for synchronously connecting the remote wireless device only with a single synchronous connection period (Tsc) that is an integer multiple of the hopping period, The synchronous connection transmitting unit sequentially switches the synchronous communication frequencies (f 1, f2, f 3) as communication frequencies for synchronization, thereby transmitting the synchronous connection signal at a plurality of the synchronous communication frequencies in one of the hopping periods, The remote wireless device has a synchronous connection reception unit (36) that, when not in synchronous connection with the base wireless device, sequentially switches the synchronous communication frequency at a switching period (Tcg) that is longer than the transition period and shorter than a period that is 2 times the transition period, thereby performing reception processing of the synchronous connection signal at a plurality of the synchronous communication frequencies.
  2. 2. The industrial wireless communication system of claim 1, wherein, With a plurality of the base wireless devices in question, A plurality of networks (43) are formed by a plurality of said remote wireless devices being synchronously connected to each of said base wireless devices.
  3. 3. An industrial wireless communication system, as set forth in claim 1 or 2, The synchronization connection period is 250msec or less.
  4. 4. An industrial wireless communication system, as set forth in claim 1 or 2, The hopping period is below 5 msec.
  5. 5. The industrial wireless communication system of claim 4, wherein, The transition period is 5msec, The number of the plurality of communication frequencies for synchronization used in the transmission processing and the reception processing is any one of 2 to 4.
  6. 6. The industrial wireless communication system of claim 5, wherein, The synchronous connection receiving section sequentially switches the communication frequency for synchronization at a period of 6 msec.
  7. 7. The industrial wireless communication system of claim 4, wherein, The transition period is 2msec, The number of the plurality of communication frequencies for synchronization used in the transmission processing and the reception processing is 2 or 3.
  8. 8. The industrial wireless communication system of claim 7, The synchronous connection receiving section sequentially switches the communication frequency for synchronization at a period of 3 msec.
  9. 9. An industrial wireless communication system, as set forth in claim 1 or 2, The synchronization connection signal includes identification information of the base wireless device, identification information of the remote wireless device that is the object of synchronization connection, and time information.
  10. 10. An industrial wireless communication system, as set forth in claim 1 or 2, The remote wireless device further includes a reception completion notification transmitter (38) that transmits a reception completion notification (Ack) to the base wireless device in a next hop period of the synchronous connection signal received when the synchronous connection signal is received by the synchronous connection receiver.
  11. 11. An industrial wireless communication system, as set forth in claim 1 or 2, The switching order of the plurality of synchronization communication frequencies used in the transmission process is made different from each other between the plurality of base wireless devices in which the combination of the plurality of synchronization communication frequencies matches each other.
  12. 12. An industrial wireless communication system, as set forth in claim 1 or 2, The base wireless device further comprises a connection state determination unit (27) that determines that one of the remote wireless devices that is connected in synchronization is in a disconnected state, based on the fact that the time at which data from the one of the remote wireless devices reaches a predetermined Time Threshold (TTH) has not been received.
  13. 13. An industrial wireless communication system, as set forth in claim 1 or 2, The base wireless device further includes a connection state determination unit that determines that one remote wireless device is in a disconnected state based on a failure to receive a reception completion notification from the one remote wireless device, regardless of whether or not a number of repetitions of data transmission to the one remote wireless device that is synchronously connected reaches a Number Threshold (NTH).
  14. 14. An industrial wireless communication system, as set forth in claim 1 or 2, The base wireless device further includes: A forced disconnection signal transmission unit (28) which transmits a forced disconnection signal for forcibly disconnecting the connection with one of the remote wireless devices connected in synchronization to the one of the remote wireless devices, and And a connection state determination unit configured to determine that the one remote wireless device is in a non-connected state when the forced disconnection signal is transmitted to the one remote wireless device by the forced disconnection signal transmission unit.
  15. 15. An industrial wireless communication system, as set forth in claim 1 or 2, The remote wireless device further includes a forced disconnection signal transmission unit that transmits a forced disconnection signal for forcibly disconnecting the connection with the base wireless device connected in synchronization to the base wireless device, The base wireless device further includes a connection state determination unit that determines that one of the remote wireless devices is in a non-connected state when the forced disconnection signal is received from the one of the remote wireless devices.
  16. 16. An industrial wireless communication system, as set forth in claim 1 or 2, When the connection with the remote wireless device connected in synchronization is disconnected, the synchronization connection transmitting unit performs transmission processing by broadcasting, and the transmission processing transmits the synchronization connection signal for performing synchronization connection again with the remote wireless device connected in synchronization in the synchronization connection period.
  17. 17. An industrial wireless communication system, as set forth in claim 1 or 2, The remote wireless device further includes a diagnostic information transmitting unit (40) that transmits diagnostic information of a device including the remote wireless device to the base wireless device during transmission and reception of data by switching the hopping frequency in the hopping period.

Description

Industrial wireless communication system Technical Field The present invention relates to an industrial wireless communication system. Background Japanese patent No. 5497730 discloses an FA system in which a PC is connected to a controller via a field network, the controller functions as a host, and wireless information is transmitted and received between the host and a slave. However, the conventional system is not always capable of rapidly performing synchronous connection. Disclosure of Invention The present invention provides an industrial wireless communication system capable of rapidly performing synchronous connection. An industrial wireless communication system according to one aspect of the present invention includes a computer that monitors and controls industrial equipment, a base wireless device that is connected to the computer via a field bus, and a plurality of remote wireless devices that are provided in each of a plurality of devices constituting the industrial equipment and that wirelessly communicate with the base wireless device, the base wireless device and the remote wireless devices that are connected in synchronization switching a hopping frequency with a predetermined hopping period to transmit and receive data, wherein the base wireless device includes a synchronization connection transmitting unit that performs transmission processing by broadcasting in a case where the base wireless device is not connected in synchronization with the remote wireless device, the transmission processing transmits a synchronization connection signal for synchronizing the remote wireless device only with an individual synchronization connection period that is an integer multiple of the hopping period, the synchronization connection transmitting unit sequentially switches a communication frequency for synchronization as a communication frequency for synchronization in one period, the base wireless device and the base wireless device is connected in synchronization with the plurality of hopping periods by switching the communication frequencies, and the synchronization connection transmitting unit has a synchronization connection synchronization signal at the synchronization period that is shorter than the synchronization period by the synchronization signal, and the synchronization connection transmitting unit is connected with the synchronization signal at the synchronization period by the synchronization period that is shorter than the synchronization period by the radio device. According to the present invention, an industrial wireless communication system capable of rapidly performing synchronous connection can be provided. Drawings Fig. 1 is a diagram showing a configuration of an industrial wireless communication system according to an embodiment. Fig. 2 is a block diagram showing an industrial wireless communication system according to an embodiment. Fig. 3 is a diagram conceptually showing transmission and reception of a synchronous connection signal. Fig. 4 is a diagram showing an example of a time chart. Fig. 5A and 5B are time charts showing examples of switching sequences of communication frequencies for synchronization. Fig. 6 is a diagram showing an example of the operation of the industrial wireless communication system according to the embodiment. Fig. 7 is a diagram showing an example of the operation of the industrial wireless communication system according to the embodiment. Fig. 8 is a diagram showing an example of the operation of the industrial wireless communication system according to the embodiment. Fig. 9 is a diagram showing an example of the operation of the industrial wireless communication system according to the embodiment. Fig. 10 is a time chart showing an example of the interrupt period Tir. Detailed Description Hereinafter, an industrial wireless communication system according to the present invention will be described in detail with reference to the drawings by way of appropriate embodiments. [ One embodiment ] An industrial wireless communication system according to an embodiment will be described with reference to fig. 1 to 9. Fig. 1 is a diagram showing a configuration of an industrial wireless communication system according to the present embodiment. Fig. 2 is a block diagram showing an industrial wireless communication system according to the present embodiment. As shown in fig. 1, an industrial wireless communication system 10 according to the present embodiment includes a computer 12, a base wireless device 14, and a remote wireless device 16. The industrial wireless communication system 10 includes a plurality of base wireless devices 14. A computer 12 can be connected to a plurality of base wireless devices 14 by means of a fieldbus 17. One base wireless device 14 can be connected synchronously with a plurality of remote wireless devices 16. A plurality of remote wireless devices 16 are connected to each base wireless device 14 in synchronization, thereby f