Modular input/output system with redundancy and testing

Communications: electrical – Continuously variable indicating – With meter reading

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Details

361683, 361686, 361733, 439 61, H05K 714

Patent

active

06097303&

ABSTRACT:
A modular input/output (I/O) system for field wiring includes a plurality of base units into which electronics modules providing appropriate signal processing are plugged. A backplane in each base unit provides leads between the electronics module and associated terminals to which the field wiring is connected and also hosts a communications bus through which the electronics modules on serially connected base members communicate with a controller. Switching modules plugged into some of the base members selectively switch field signals applied to terminals for an associated electronics module to another electronics module for redundancy, or switch test signals into the associated electronics module in place of the field wiring signals. The test signals are generated by yet another of the electronics modules while still another electronics module generates control signals for the switching modules.

REFERENCES:
patent: 4574068 (1986-03-01), Hill et al.
patent: 4774510 (1988-09-01), Steinke
patent: 5159534 (1992-10-01), Hudson et al.
patent: 5202822 (1993-04-01), McLaughlin et al.
patent: 5210756 (1993-05-01), Kummer et al.
patent: 5472347 (1995-12-01), Nordenstrom et al.

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