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US4829596A
Expired / Lapsed
US
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Programmable controller with fiber optic input/output module
Assignee: Allen Bradley Co LLC
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Filing: 1987-02-09
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Granted: 1989-05-09
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Expires: 2007-02-09
Abstract
Abstract A fiber optic communication system especially adapted for use with a programmable industrial controller includes a machanism for evaluating the quality of the fiber optic link. The system includes a transmitter for sending a different unique character over the fiber optic cable at a plurality of light intensities. A receiver is coupled to the fiber optic cable for receiving the characters from the transmitter. The receiver determines whether information was received at each of the plurality of light intensities by determining which of the unique characters were received. In response to the determination of the light intensities that were received an evaluation of the quality of the fiber optic communication system is made.
Inventors
- 👤 Paul H. Barina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:36
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/07; G; G05; G05B; G05B19/00; G05B19/02; G05B19/04; G05B19/05; G05B19/054; H04L; H04L1/00; H04L1/20; G05B2219/00; G05B2219/10; G05B2219/15; G05B2219/15017
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
A communication system employing an optical communication link, said system comprising: a transmitter for transmitting a plurality of predefined light intensities through the communication link and including two power terminals, a light source coupled to the communication link and having a first terminal connected to one of the power terminals and a second terminal connected to a node, and means for selectively connecting different impedances between the other of the power terminals and the node to selectively apply at least two different magnitudes of electric current to the light source; a means for receiving the light transmitted through said communication link; means, coupled to said means for receiving, for determining for which ones of the plurality of transmitted light intensities light is and is not received; and means, responsive to said means for determining, for evaluating the attenuation characteristic of the optical communication link.
Claim 2
Dependent Claim
144 words
A communication system employing an optical communication link, said system comprising: a transmitter for transmitting a plurality of predefined light intensities through the communication link and including two power terminals, a light source coupled to the communication link and having a first terminal connected to one of the power terminals and a second terminal connected to a node, and means for selectively connecting different impedances between the other of the power terminals and the node to selectively apply at least two different magnitudes of electric current to the light source; a means for receiving the light transmitted through said communication link; means, coupled to said means for receiving, for determining for which ones of the plurality of transmitted light intensities light is and is not received; and means, responsive to said means for determining, for evaluating the attenuation characteristic of the optical communication link.
Claim 3
Dependent Claim
25 words
The communication system as in claim 1 wherein the transmitter includes means for sending a unique signal at each of the plurality of light intensities.
Claim 4
Dependent Claim
38 words
The communication system as in claim 2 wherein said means for determining includes means for detecting which ones of the unique signals are received and thereby determining for which ones of the transmitted light intensities light is received.
Claim 5
Dependent Claim
147 words
An input/output system for connecting a remote device to a programmable controller via a fiber optic communication link, said input/output system comprising: means for transmitting light to the remote device through the fiber optic link at a plurality of intensity levels and including two power terminals, a light source having a first terminal connected to one of the power terminals and a second terminal connected to a node, and means for selectively connecting different impedances between the other of the power terminals and the node; means for receiving light returned by the remote device via the fiber optic link; means, coupled to said means for receiving, for determining for which ones of the plurality of transmitted light intensities light is and is not received from the remote device; and means, responsive to said means for determining, for evaluating the attenuation characteristic of the fiber optic communication link.
Claim 6
Dependent Claim
147 words
An input/output system for connecting a remote device to a programmable controller via a fiber optic communication link, said input/output system comprising: means for transmitting light to the remote device through the fiber optic link at a plurality of intensity levels and including two power terminals, a light source having a first terminal connected to one of the power terminals and a second terminal connected to a node, and means for selectively connecting different impedances between the other of the power terminals and the node; means for receiving light returned by the remote device via the fiber optic link; means, coupled to said means for receiving, for determining for which ones of the plurality of transmitted light intensities light is and is not received from the remote device; and means, responsive to said means for determining, for evaluating the attenuation characteristic of the fiber optic communication link.
Claim 7
Dependent Claim
26 words
The system as in claim 4 wherein the transmitting means includes means for sending a unique signal at each of the plurality of light intensity levels.
Claim 8
Dependent Claim
38 words
The system as in claim 5 wherein said means for determining includes means for detecting which ones of the unique signals are received and thereby determining for which ones of the transmitted light intensity levels light is received.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |