Digital/frequency input for industrial control applications

Details Digital/frequency input for industrial control applications Digital/frequency input for industrial control applications

H - Electricity

03

K

328/114.3

H03K 19/14 (2006.01) H04B 10/00 (2006.01) H04L 25/26 (2006.01)

Patent

CA 2002791

An input circuit for conditioning a control signal having a variety of waveforms and voltage levels, comprises a pair of input terminals having a metal oxide varistor connected thereacross. One terminal is connected to the base of a transistor through a resistor, the emitter of the transistor driving an opto-coupler for isolating the control signal from a micro-processor which receives the control signal over an inverter having a Schmitt trigger input.

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