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1. (WO2018067560) ENERGY LIMITING BARRIER FOR UNIVERSAL IO IN INTRINSICALLY SAFE INDUSTRIAL APPLICATIONS

Pub. No.:    WO/2018/067560    International Application No.:    PCT/US2017/054932
Publication Date: Fri Apr 13 01:59:59 CEST 2018 International Filing Date: Wed Oct 04 01:59:59 CEST 2017
IPC: G06F 1/26
Applicants: HONEYWELL INTERNATIONAL INC.
Inventors: KN, Dinesh Kumar
JAGANNATHAN, Sai Krishnan
Title: ENERGY LIMITING BARRIER FOR UNIVERSAL IO IN INTRINSICALLY SAFE INDUSTRIAL APPLICATIONS
Abstract:
An apparatus (112, 208, 314) includes one or more channels. Each channel includes circuitry (212) configured to receive an input current from a universal input/output (UIO) (104, 206) and provide an output to a field device (102a, 102b, 204) in a hazardous or potentially hazardous zone, the circuitry further configured to limit energy to the field device by limiting at least one of a voltage, a current, or a power of the output. Each channel also includes terminals (214) configured to connect the circuitry to one or more cables coupling the field device to the apparatus. Each channel is configured to provide an intrinsically safe barrier between the field device and a controller that controls operation of the field device.