Input circuit for digital control systems

Details Input circuit for digital control systems Input circuit for digital control systems

1979-05-14

1981-06-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

042753074

ABSTRACT:
An input circuit for a digital control system includes a rectifier circuit, a current limiting circuit and a set of zener diodes which can be selectively employed to receive a wide variety of signals from industrial sensing devices. The signal is generated to an output drive circuit by an optocoupler which provides electrical isolation. The output drive circuit generates a logic level signal which is compatible with the digital electronic control system. The input circuit is particularly well suited for fabrication as an integrated circuit.

REFERENCES:
patent: 3691403 (1972-09-01), Newmeyer
patent: 4079272 (1978-03-01), Howatt
Drawing for Allen-Bradley Part No. 634760 entitled, "AC/DC Input Module Block Diagram".

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