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

G - Physics

05

B

341/112

G05B 19/02 (2006.01) G05B 19/05 (2006.01)

Patent

CA 1331797

COMBINED INPUT/OUTPUT CIRCUIT FOR A PROGRAMMABLE CONTROLLER ABSTRACT OF THE DISCLOSURE 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.

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