# US 2017/0289959 A1 · Industrial wireless communications system

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- Number: US 2017/0289959 A1
- Document ID: US20170289959A1
- Status: Published application
- Kind: A1
- Application number: 15/469,743
- Filed: 2017-03-27
- Published: 2017-10-05
- Earliest claimed: 2016-04-04
- Assignees: SMC Corporation
- Applicants: Smc Corporation
- Inventors: Tomohiko AKI; Kazuhiro Ishikawa; Koji Kunii; Toshiaki Kuwahara; Yoshihiro Nozaki; Shengcong Wu; Norimasa Ozaki
- Web page: https://patentgrep.com/patent/US20170289959A1

## CPC

- H04W 72/30: Resource management for broadcast services
- H04B 1/713: using frequency hopping
- H04L 12/403: with centralised control, e.g. polling
- H04W 56/0015: {one node acting as a reference for the others}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 76/10: Connection setup
- H04B 1/7156: Arrangements for sequence synchronisation
- H04L 2012/4026: {Bus for use in automation systems}
- H04W 16/12: Fixed resource partitioning
- H04W 84/18: Self-organising networks, e.g. ad-hoc networks or sensor networks
- H04W 84/20: Leader-follower arrangements
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

An industrial wireless communications system includes a PLC that performs at least monitoring within an industrial facility, at least one master wireless device connected to the PLC by a fieldbus, a plurality of slave wireless devices, which are installed corresponding to respective hardware devices, and carry out wireless communications with the master wireless device, a connection processing unit that carries out a connection process wirelessly between the master wireless device and the slave wireless devices, and a transmission/reception processing unit that transmits and receives data wirelessly between the master wireless device and the slave wireless devices.

## Claims

### Claim 1

An industrial wireless communications system, comprising:
a computer configured to perform at least monitoring within an industrial facility;
at least one master wireless device connected to the computer by a fieldbus;
a plurality of slave wireless devices, which are installed corresponding to respective hardware devices, and are configured to carry out wireless communications with the master wireless device;
a connection processing unit configured to carry out a connection process wirelessly between the master wireless device and the slave wireless devices; and
a transmission/reception processing unit configured to transmit and receive data wirelessly between the master wireless device and the slave wireless devices.

### Claim 2 (depends on 1)

The industrial wireless communications system according to claim 1, wherein:
the connection processing unit is configured to carry out wireless communications at time intervals of 500 msec or less from the master wireless device to the plurality of slave wireless devices over a broadcast system and at synchronous frequencies; and
the transmission/reception processing unit is configured to carry out wireless communications by a frequency hopping method between the master wireless device and the slave wireless devices.

### Claim 3 (depends on 1)

The industrial wireless communications system according to claim 1, wherein a 2.4 GHz band is used as a wireless frequency, and a wireless power is less than or equal to 1 mW.

### Claim 4 (depends on 1)

The industrial wireless communications system according to claim 1, further comprising a connection maintenance processing unit configured to carry out a connection maintenance process with the master wireless device, by transmitting clock information of the master wireless device periodically with respect to the slave wireless devices in which the connection process has been carried out.

### Claim 5 (depends on 1)

The industrial wireless communications system according to claim 1, further comprising a connection confirmation processing unit configured to confirm establishment of wireless communications between the master wireless device and the plurality of slave wireless devices, by repeating periodic transmissions from the slave wireless devices and reception by the master wireless device.