Manufacturing System and Method

• US 20080082196A1
• Filed: 09/29/2006
• Published: 04/03/2008
• Est. Priority Date: 09/29/2006
• Status: Abandoned Application

• Current Assignee: Rockwell Automation Technologies Incorporated (Rockwell Automation, Inc.)
• Original Assignee: Rockwell Automation Technologies Incorporated (Rockwell Automation, Inc.)
• Inventors: Wiese, Gregory S., Nair, Suresh R.
• Application Number:
  US11/537,038
• Publication Number:
  US 20080082196A1
• Time in Patent Office: Days
• US Class Current: 700/110
• CPC Class Codes: G05B 19/4184 characterised by fault tolerance, reliability of production system
• CPC Class Codes: G05B 2219/45135 Welding
• CPC Class Codes: Y02P 90/02 Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

An automated manufacturing system, intermediate control device for implementation in such a system, and method of performing a manufacturing operation are disclosed. In at least some embodiments, the automated manufacturing system includes a first sensor that provides a first output signal, a first controllable device, and a first process controller capable of issuing a first command to the first controllable device. The system further includes a first intermediate control device coupled between the first sensor and the first process controller. The first intermediate control device receives the first output signal and determines, based at least in part upon the first output signal, whether to send an additional signal to the first process controller indicative of a failure condition.

Claims

1. An automated manufacturing system comprising:

a first sensor that provides a first output signal;

a first controllable device;

a first process controller capable of issuing a first command to the first controllable device; and

a first intermediate control device coupled between the first sensor and the first process controller,

wherein the first intermediate control device receives the first output signal and determines, based at least in part upon the first output signal, whether to send an additional signal to the first process controller indicative of a failure condition.

2. The automated manufacturing system of claim 1, wherein the first controllable device is capable of generating a high intensity electromagnetic field, and

wherein the first sensor is located at a first position that is closer to the first controllable device than a second position at which is located the first intermediate control device.

3. The automated manufacturing system of claim 2, wherein a first intensity of the high intensity electromagnetic field at the second position is less than 10% of a maximum intensity of the high intensity electromagnetic field occurring at substantially that same time, and wherein the first intensity experienced at the first intermediate control device is substantially less than an additional intensity experienced by the first sensor at the first position.

4. The automated manufacturing system of claim 2, wherein the automated manufacturing system is configured to perform a welding operation and the first controllable device is a welding device.

5. The automated manufacturing system of claim 1 wherein the automated manufacturing system is an automotive welding system.

6. The automated manufacturing system of claim 1, further comprising a second controllable device, wherein the second controllable device is selected from the group consisting of a clamping device and a moving device.

7. The automated manufacturing system of claim 1, wherein the first intermediate control device includes a means for processing that determines whether to send the additional signal.

8. The automated manufacturing system of claim 1, wherein the first intermediate control device includes at least one of weld field immunity management circuitry and weld field immunity management software by which the first intermediate control device determines whether to send the additional signal.

9. The automated manufacturing system of claim 1, wherein the first intermediate control device determines whether to send the additional signal by determining whether the received first output signal remains at an inappropriate level for longer than a first time threshold.

10. The automated manufacturing system of claim 9, wherein the first time threshold is at least one of a length of a single weld cycle and approximately one second.

11. The automated manufacturing system of claim 1, wherein the first intermediate control device includes circuitry selected from the group consisting of power management circuitry, electrical protection circuitry, and output switching circuitry.

12. The automated manufacturing system of claim 1, wherein the first intermediate control device includes at least one of sequencing circuitry and sequencing software.

13. The automated manufacturing system of claim 1, wherein the first sensor does not include any of power management circuitry, electrical protection circuitry, and output switching circuitry, but does include a signal processing circuit capable of generating the first output signal.

14. The automated manufacturing system of claim 1, further comprising a second sensor that provides a second output signal, wherein the first intermediate control device receives the second output signal and determines, based at least in part upon both the first and second output signals, whether to send the additional signal.

15. The automated manufacturing system of claim 14, wherein the first intermediate control device determines that the additional signal should be sent if it is determined that both the first and second sensors have failed, and determines that an alternate, warning signal should be sent if it is determined that one of the first and second sensors has failed and the other of those sensors has not failed.

16. The automated manufacturing system of claim 1, wherein the first intermediate control device is coupled to the first sensor by one of a first wired connection and a first wireless connection.

17. The automated manufacturing system of claim 1, wherein the first process controller is a programmable logic controller (PLC).

18. The automated manufacturing system of claim 1, further comprising at least one of a second process controller and a computer that is coupled to the first process controller by way of a network.

19. The automated manufacturing system of claim 1, wherein the first sensor is selected from the group consisting of an inductive sensor, a photoelectric sensor, a photosensor, a magnetic sensor, a laser sensor, a pressure sensor, a temperature sensor, a vibration sensor, a proximity sensor, a position sensor, a flow sensor, an ultrasonic sensor, a capacitive sensor, a RF sensor, a humidity sensor, and a transducer.

20. The automated manufacturing system of claim 1, wherein the first sensor includes either both a sensing component and a signal processing component, or both a sensing component and a wireless transceiver.

21. The automated manufacturing system of claim 1, wherein the intermediate control device includes an electromagnetic radiation shielding structure.

22. An intermediate control device for implementation in an automated manufacturing system, the intermediate control device comprising:

a plurality of input terminals capable of being coupled to a plurality of sensors and receiving a plurality of sensor signals therefrom;

a first output terminal capable of being coupled to a programmable logic controller and sending an output signal thereto; and

a processing component capable of determining whether to send the output signal based at least in part upon at least one of the sensor signals, the output signal indicating a failure of at least one of the plurality of sensors.

23. The intermediate control device of claim 22, wherein the processing component determines whether to send the output signal based upon a determination that at least one of the sensor signals has taken on an abnormal value for longer than a first time threshold.

24. The intermediate control device of claim 23, wherein the first time threshold is a time period corresponding to a single weld cycle.

25. The intermediate control device of claim 22, wherein the processing component determines whether to send the output signal based upon a determination that more than one of the sensor signals have taken on abnormal values.

26. The intermediate control device of claim 22, wherein the intermediate control device includes circuitry selected from the group consisting of power management circuitry, electrical protection circuitry, and output switching circuitry.

27. The intermediate control device of claim 22, wherein the processing component is capable of conducting sequencing.

28. The intermediate control device of claim 22, further comprising an electromagnetic radiation shielding structure.

29. A method of performing a manufacturing operation, the method comprising:

sensing a presence of a component at a sensor;

conducting a manufacturing operation that is capable of effecting a stress on the sensor;

determining whether an output signal from the sensor has taken on a characteristic indicative of a failure of the sensor; and

if it is determined that the output signal has taken on the characteristic, sending an output signal to a controller.

30. The method of claim 29, wherein the manufacturing operation is a welding operation.

31. The method of claim 29, wherein the stress on the sensor involves at least one of exposure of the sensor to heat, exposure of the sensor to a chemical, and exposure of the sensor to a physical impulse or impact.

32. The method of claim 29, wherein the determining is performed by an intermediate control device coupled between the controller and the sensor.

33. The method of claim 32, wherein the controller is a programmable logic controller and the sensor is selected from the group consisting of an inductive sensor, a photoelectric sensor, a photosensor, a magnetic sensor, a laser sensor, a pressure sensor, a temperature sensor, a vibration sensor, a proximity sensor, a position sensor, a flow sensor, an ultrasonic sensor, a capacitive sensor, a RF sensor, a humidity sensor, and a transducer.

34. The method of claim 29, further comprising transporting a component into a region, and clamping the component within the region, prior to the conducting of the manufacturing operation.

35. The method of claim 34, further comprising declamping the component and moving the component out of the region, subsequent to the conducting of the manufacturing operation.

36. The method of claim 35, wherein the transporting, clamping, conducting, declamping and moving are all controlled by the controller.

37. The method of claim 29, wherein it is determined that the output signal has taken on the characteristic if the output signal takes on an inappropriate value for longer than a single weld cycle.