Programmable controller with fiber optic input/output module

Details Programmable controller with fiber optic input/output module Programmable controller with fiber optic input/output module

1987-02-09

1989-05-09

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

356 731, 370 3, 455610, 455617, H45

Patent

active

048295965

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.

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