RFID tag based discrete contact position indication

• US 7,994,924 B2
• Filed: 09/30/2008
• Issued: 08/09/2011
• Est. Priority Date: 09/30/2008
• Status: Active Grant

• Current Assignee: Rockwell Automation Technologies Incorporated (Allen-Bradley Co., Inc.)
• Original Assignee: Rockwell Automation Technologies Incorporated (Allen-Bradley Co., Inc.)
• Inventors: Brandt, David Dale, Wielebski, Wayne H
• Primary Examiner(s): Pham, Toan N
• Application Number:
  US12/242,053
• Publication Number:
  US 20100079289A1
• Time in Patent Office: 1,043 Days
• Field of Search: 340/572.1, 340/572.7, 340/10.1, 340/540, 235/492, 235/441, 235/487
• US Class Current: 340/572.7
• CPC Class Codes: H01H 9/168 making use of an electromagnetic wave communication
• CPC Class Codes: H01Q 1/2208 associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: H01Q 1/2216 used in interrogator/reader equipment

Abstract

An RF based state indicator for indicating the state of a control device is provided. The RF-based state indicator indicates the position of a control mechanism by using the position of the control mechanism to enable or disable an RF tag. An RF reader acquires RF transmitted data from enabled RF tags and uses the data to indicate or control an operation aspect of a device.

Claims

1. A wireless input device comprising:

a first radio frequency antenna;

a first data storage circuit couplable to the first antenna;

a second radio frequency antenna;

a second data storage couplable to the second antenna; and

an operator movable with respect to the first antenna and second antenna for altering operation of the first antenna and the second antenna and the first circuit and the second circuit to enable the antennas to communicate signals in accordance with data stored on the respective data storage circuit.

2. The device of claim 1, wherein the operator completes or interrupts a conductive path defining the first or second antenna.

3. The device of claim 1, wherein the operator shorts or unshorts the first or second antenna.

4. The device of claim 1, wherein the operator alters an electromagnetic property of the first or second antenna.

5. The device of claim 1, wherein the operator shields or unshields the first or second antenna.

6. The device of claim 1, wherein the operator changes a resonant frequency of the first or second antenna.

7. The device of claim 1, wherein the first or second data storage circuit is separated from the first or second antenna, respectively, by a gap and wherein the operator includes a body and a mechanism to engage a conductive portion that spans the gap to complete the conductive path.

8. The device of claim 7, wherein the first or second data storage circuit is separated from the first or second antenna, respectively, by a plurality of gaps and wherein the operator engages a corresponding number of conductive portions that span the respective gaps to complete the conductive path.

9. The device of claim 1, wherein the operator is movable linearly towards and away from the first and second antenna and the first and second circuit.

10. The device of claim 1, comprising a plurality of additional antennas and a plurality of additional respective data storage circuits.

11. The device of claim 10, wherein the operator is rotatable with respect to the respective antennas for selectively completing and interrupting a conductive path between one antenna and a respective circuit at any one time.

12. The device of claim 10, wherein the operator includes a plurality of conductive portions at ends thereof, and wherein the operator is movable linearly with respect to the respective antennas and circuits for completing and interrupting a conductive path between one antenna and a respective circuit at any one time.

13. The device of claim 1, wherein the first antenna is enabled when the second antenna is disabled, and the second antenna is enabled when the first antenna is disabled.

14. A wireless input device comprising:

a radio frequency antenna;

a data storage circuit couplable to the antenna; and

an operator movable with respect to the antenna for affecting a connection between the antenna and the circuit to selectively enable the antenna to communicate signals in accordance with data stored on the circuit and to disable the antenna from communicating the signals, wherein the circuit and antenna are configured to be powered by a read signal transmitted by a radio frequency reader.

15. The device of claim 14, wherein the operator completes and interrupts a conductive path between the antenna and the circuit to allow the antenna to communicate signals and to interrupt the communication of signals, respectively.

16. The device of claim 14, wherein the antenna and the circuit are electrically coupled to one another, and wherein the operator establishes an alternative current path around the circuit to interrupt the communication of signals.

17. The device of claim 14, wherein the antenna and the circuit are electrically coupled to one another, and wherein the operator alters a characteristic of the antenna to interrupt the communication of signals.

18. The device of claim 14, wherein the operator is movable linearly towards and away from the antenna and circuit.

19. The device of claim 14, wherein the operator is rotatable with respect to the antenna and circuit.

20. The device of claim 14, comprising a plurality of antennas and a plurality of respective data storage circuits.

21. An electrical system configured to receive an input signal comprising:

an input device including a radio frequency antenna, a data storage circuit couplable to the antenna, and an operator movable with respect to the antenna for affecting a connection between the antenna and the circuit to selectively enable the antenna to communicate signals in accordance with data stored on the circuit and to disable the antenna from communicating the signals;

a radio frequency reader configured to receive signals from the input device; and

processing circuitry coupled to the reader and configured to provide an output signal to drive circuitry for driving an electrical load based upon the received signals.

22. The system of claim 21, wherein the reader transmits a read signal to the input device, and wherein the circuit and antenna are powered by the read signal.

23. The system of claim 21, wherein the reader is coupled to the processing circuitry remotely via a network.

24. The system of claim 21, wherein the drive circuitry includes electrical switchgear for driving a motor.

25. The system of claim 21, wherein the load includes a human perceivable indicator of a state of an actuator.

26. A wireless input device comprising:

a radio frequency antenna;

a data storage circuit couplable to the antenna; and

an operator rotatable with respect to the antenna and the data storage circuit for selectively completing and interrupting a conductive path between the antenna and the circuit to selectively enable the antenna to communicate signals in accordance with data stored on the circuit and to disable the antenna from communicating the signals.