Low voltage industrial control system providing intrinsically sa

Details Low voltage industrial control system providing intrinsically sa Low voltage industrial control system providing intrinsically sa

1998-06-03

2000-11-28

An, Meng-Ai T.

Data processing: generic control systems or specific application

Specific application, apparatus or process

Product assembly or manufacturing

700266, 700 21, G06F 1900

Patent

active

061546836

ABSTRACT:
Low voltage logic circuitry is used to permit an entire subsystem of an industrial controller to be placed within a hazardous environment to receive a high speed serial link and undertake the control of multiple control points without expensive and awkward long cable runs and electrically isolating circuits for each cable run. Energy and bandwidth limiting on the high speed link allows power levels commensurate with high data rates yet intrinsic safety of the media allowing it to freely pass in and out of the hazardous area. A mixture of intrinsically safe and non-intrinsically safe equipment on the same logical rack is allowed through a bus isolator providing isolated data communication in backplane fashion between modules while wholly isolating power transmission along the backplane.

REFERENCES:
patent: 3973170 (1976-08-01), Hogan
patent: 5583764 (1996-12-01), Nail et al.
patent: 5623401 (1997-04-01), Baxter

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