Radio frequency (RF) diagnostic coverage for wireless proximity stop systems and corresponding methods of operating wireless proximity stop systems

Patent metadata

Field	Value
Publication number	US-12289633-B2
Application number	US-202217880428-A
Country	US
Kind code	B2
Filing date	Aug 3, 2022
Priority date	Jun 10, 2022
Publication date	Apr 29, 2025
Grant date	Apr 29, 2025

Abstract

A wireless Proximity Stop system includes one or more Machine Safety Devices (MSDs) and one or more Personal Safety Devices (PSDs). Each MSD includes a wireless communication interface with Diagnostic Coverage (DC). Each PSD includes a wireless communication interface with Diagnostic Coverage (DC) for wireless communication with the one or more MSDs. Each PSD is configured to be operable for initiating and safely terminating a Proximity Stop signal to the one or more MSDs to trigger a Proximity Stop function of the one or more MSDs for stopping operation of a connected machine(s). Each PSD includes a transmitter and separate receiver operable for verifying that the transmitter is transmitting with the correct data and power level. Each MSD includes a receiver and a separate transmitter or local transmitting beacon usable by the receiver for verifying that the receiver is capable of receiving with the correct data and power level.

First claim

The invention claimed is:

1. A wireless Proximity Stop system comprising:
one or more Machine Safety Devices (MSDs) each configured to be coupled with or integrated to a machine stop circuit for stopping operation of a connected machine when a Proximity Stop function is triggered, each MSD including a wireless communication interface with Diagnostic Coverage (DC); and
one or more Personal Safety Devices (PSDs) each including a wireless communication interface with Diagnostic Coverage (DC) for wireless communication with the one or more MSDs, each PSD configured to be operable for initiating and safely terminating a Proximity Stop signal to the one or more MSDs to trigger the Proximity Stop function for stopping operation of the connected machine(s);
wherein:
each PSD includes a transmitter and separate receiver operable for verifying that the transmitter is transmitting with the correct data and power level; and
each MSD includes a receiver and a separate transmitter or local transmitting beacon usable by the receiver for verifying that the receiver is capable of receiving with the correct data and power level;

wherein the system is configured such that each PSD and each MSD are not required to be in continuous communication mode to continue safe operation of the connected machine(s).

2. The wireless Proximity Stop system of claim 1 , wherein each PSD is configured to be operable as a beacon such that the Proximity Stop function is triggered for any MSD that comes within a defined proximity to said PSD for stopping operation of the connected machine(s) within the defined proximity.

3. The wireless Proximity Stop system of claim 1 , wherein the transmitter and the separate receiver of each PSD are configured to have a Category 3 architecture.

4. The wireless Proximity Stop system of claim 1 , wherein the system is configured to be operable for verifying radio frequency (RF) transmission and reception to verify that RF communications are possible between each PSD and each MSD in a non-maintained link.

5. The wireless Proximity Stop system of claim 1 , wherein each MSD is wired to a corresponding machine stop circuit for stopping operation of the connected machine when the machine stop circuit is activated.

6. The wireless Proximity Stop system of claim 1 , wherein the system is configured such that each PSD and each MSD incorporates a safe wireless communication interface to implement a Proximity Stop mode that when activated allows the MSD to receive the transmitted Proximity Stop signal of one or more PSDs and trigger the Proximity Stop function for stopping operation of the connected machine(s).

7. The wireless Proximity Stop system of claim 1 , wherein the system is configured to define a Proximity Stop trigger(s) by one or more of a signal level, time of flight, angle of departure, and/or angle of arrival.

8. The wireless Proximity Stop system of claim 1 , wherein the system is configured to be operable for safely re-enabling any MSDs that have been placed in a stop state by detection of Proximity Stop criteria.

9. The wireless Proximity Stop system of claim 1 , wherein each MSD is configured to be operable to:
open its safety relay(s) or change its bus status to stop to thereby stop operation of the connected machine when the Proximity Stop function is triggered by one or more of the one or more PSDs; and
maintain its safety relay(s) closed or maintain its bus in a safe state to thereby allow continued operation of the connected machine while the Proximity Stop function is not triggered.

10. The wireless Proximity Stop system of claim 1 , wherein each MSD is configured to be operable to:
maintain its safety relay(s) closed or maintain its bus status safe so that the connected machine is allowed to operate normally when no PSDs have been detected and no internal faults of the MSD are detected; and
open its safety relay(s) or change its bus status to stop to thereby stop operation of the connected machine when one or more PSDs are detected by the MSD and to maintain that state until all previously detected PSDs have issued a release command.

11. The wireless Proximity Stop system of claim 1 , wherein each MSD includes:
one or more safety relays for state change in response to the Proximity Stop function being triggered; and
one or more safety relays for state change in response to a loss of RF diagnostic coverage;
wherein each of the one or more safety relays are connected to a machine stop circuit.

12. The wireless Proximity Stop system of claim 1 , wherein the system is configured such that the one or more PSDs are detectable by the one or more MSDs as being within proximity of the one or more MSDs by a signal quality threshold and/or by a range detection method.

13. The wireless Proximity Stop system of claim 12 , wherein the system is configured such that the Proximity Stop function is triggered for the one or more MSDs after detecting the one or more PSDs as being within proximity by the signal quality threshold and/or by the range detection method.

14. The wireless Proximity Stop system of claim 1 , wherein the system is configured such that the one or more PSDs are detectable by the one or more MSDs as being within proximity by a threshold indicative of sufficient RF signal strength including an RSSI threshold value, other signal level, a time of flight, an angle of departure, and/or an angle of arrival.

15. The wireless Proximity Stop system of claim 14 , wherein the system is configured such that the Proximity Stop function is triggered for the one or more MSDs after detecting the one or more PSDs as being within proximity by the threshold indicative of sufficient RF signal strength including the RSSI threshold value, other signal level, the time of flight, the angle of departure, and/or the angle of arrival.

16. The wireless Proximity Stop system of claim 1 , wherein the system is configured or provided with diagnostic coverage to radio frequency (RF) transmission and reception to verify that RF communications are possible between each PSD and each MSD in a non-maintained link.

17. The wireless Proximity Stop system of claim 1 , wherein the system is configured to be operable for ensuring the one or more MSDs remain in a safe state should the one or more PSDs unexpectedly stop transmissions.

18. The wireless Proximity Stop system of claim 1 , wherein the system is configured to be operable for using a beacon(s) of the one or more PSDs as part of a safety barriers door interlock system in which each PSD must be correctly activated prior to entry.

19. The wireless Proximity Stop system of claim 1 , wherein:
each PSD is configured to be operable as a beacon such that the Proximity Stop function is triggered for any MSD that comes within a defined proximity to said PSD for stopping operation of the connected machine(s) within the defined proximity;
the system is configured to be operable for verifying radio frequency (RF) transmission and reception to verify that RF communications are possible between each PSD and each MSD in a non-maintained link;
each MSD is wired to a corresponding machine stop circuit for stopping operation of the connected machine when the machine stop circuit is activated;
the system is configured such that the one or more PSDs are detectable by the one or more MSDs as being within proximity by a threshold indicative of sufficient RF signal strength including an RSSI threshold value, other signal level, a time of flight, an angle of departure, and/or an angle of arrival; and
the system is confi

Assignees

• Cattron North America Inc

Inventors

• Stagg David

Classifications

• H04W72/0473

  the resource being transmission power · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04W52/34

  TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading · CPC title

• H04L5/0073

  Allocation arrangements that take into account other cell interferences · CPC title

• H04B17/327

  Received signal code power [RSCP] · CPC title