Combined input/output circuit for a programmable controller

Details Combined input/output circuit for a programmable controller Combined input/output circuit for a programmable controller

1988-11-18

1990-08-21

Eng, David Y.

Boots, shoes, and leggings

3649269, 36492693, 361 98, G06F 1300

Patent

active

049512501

ABSTRACT:
A combined input/output circuit is provided which is configurable either as in input circuit or an output circuit for use in a programmable controller. The input/output circuit includes apparatus which detects undesired overcurrent and overvoltage external conditions and adaptively protects itself from such conditions. The circuit includes a sensing circuit which is capable of sensing overcurrent conditions and detecting input data depending on the configuration of the input/output circuit. The inherent characteristics of a switching device used to configure the circuit in either an input or output state are used to detect overcurrent and to limit fault current.

REFERENCES:
patent: 4564879 (1986-01-01), Bienstman
patent: 4593380 (1986-06-01), Kocher et al.
patent: 4628397 (1986-12-01), Garlis et al.

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