Power supply communication system and method

• US 7,907,050 B1
• Filed: 02/04/2008
• Issued: 03/15/2011
• Est. Priority Date: 09/30/2003
• Status: Expired due to Fees

• Current Assignee: Rockwell Automation Technologies Incorporated (Allen-Bradley Co., Inc.)
• Original Assignee: Rockwell Automation Technologies Incorporated (Allen-Bradley Co., Inc.)
• Inventors: Callaghan, David M.
• Primary Examiner(s): Nguyen; Tai T
• Application Number:
  US12/025,318
• Time in Patent Office: 1,135 Days
• Field of Search: 340/538, 340/539, 340/540, 340/541, 340/310.03, 340/310.06, 714/47, 714/736, 700/79, 700/16
• US Class Current: 340/538
• CPC Class Codes: H04B 2203/5445 Local network
• CPC Class Codes: H04B 3/542 the information being in digital form

Abstract

A system and method for configuring and monitoring devices utilizing a power line network is provided herein. Each network device (e.g., programmable logic controller, machine, or sensor) contains a power line interface to facilitate communication over a power line network. The power line interfaces contain at least one unique identifier to distinguish the interface and its associated network device from other devices on the same network and thereby enable device message exchange. The ubiquity of power lines in an industrial environment or any environment for that matter provides an accommodating medium of communication, which the subject invention exploits to set-up, configure, and program industrial control devices connected thereto. Furthermore, the subject invention can utilizes power lines after configuration, during system operation, or upon device failure to monitor, diagnose, and/or predict the health of a system device.

Claims

1. A system for monitoring the health of electrical devices comprising:

a diagnostic component;

an electrical device, wherein the electrical device is at least one of a programmable logic controller (PLC) module, a control module, an input module, or an output module;

power lines connecting the diagnostic component to the electrical device, wherein the diagnostic component monitors one or more health parameters of the electric device utilizing the power lines, wherein the power lines provide power to and communication between the diagnostic component and the electric device;

a plurality of interfaces, where each of the diagnostic component and the electrical device has an associated interface from the plurality of interfaces to enable the communication between the diagnostic component and the electrical device over the power lines; and

one or more sensors, wherein the power lines connect the electrical device to the one or more sensors, the power lines provide power to the one or more sensors, the electrical device communicates with the one or more sensors via the power lines.

2. The system of claim 1, wherein the interfaces retrieve a communication signal imposed on a power signal transferred over the power lines.

3. The system of claim 2, wherein each interface of the plurality of interfaces has a unique identifying indicia that allows the interface to be uniquely identified over the power lines.

4. The system of claim 1, further comprising one or more machines, wherein the power lines connect the electrical device to the one or more machines, the power lines provide power to the one or more machines, the electrical device communicates with the one or more machines via the power lines.

5. The system of claim 1, wherein power is transmitted at a low frequency over the power line and a communication signal for the communication is transmitted at a frequency higher than the low frequency over the power line.

6. A system for monitoring the health of electrical devices comprising:

a diagnostic component;

an electrical device, wherein the electrical device is at least one of a programmable logic controller (PLC) module, a control module, an input module, or an output module;

power lines connecting the diagnostic component to the electrical device, wherein the diagnostic component monitors one or more health parameters of the electric device utilizing the power lines, wherein the power lines provide power to and communication between the diagnostic component and the electric device; and

a plurality of interfaces, where each of the diagnostic component and the electrical device has an associated interface from the plurality of interfaces to enable the communication between the diagnostic component and the electrical device over the power lines; and

one or more machines, wherein the power lines connect the electrical device to the one or more machines, the power lines provide power to the one or more machines, the electrical device communicates with the one or more machines via the power lines.

7. The system of claim 6, wherein the interfaces retrieve a communication signal imposed on a power signal transferred over the power lines.

8. The system of claim 7, wherein each interface of the plurality of interfaces has a unique identifying indicia that allows the interface to be uniquely identified over the power lines.

9. The system of claim 6, further comprising one or more sensors, wherein the power lines connect the electrical device to the one or more sensors, the power lines provide power to the one or more sensors, the electrical device communicates with the one or more sensors via the power lines.

10. The system of claim 6, wherein power is transmitted at a low frequency over the power line and a communication signal for the communication is transmitted at a frequency higher than the low frequency over the power line.