Two-wire pilot device solid state control system

Details Two-wire pilot device solid state control system Two-wire pilot device solid state control system

1976-10-12

1978-07-25

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular system function

340538, 340650, G08B 2100

Patent

active

041032993

ABSTRACT:
A line of 2-wire pilot devices using current level as a signal for implementing solid state control systems. A variety of alternative pilot devices such as flag type limit switch, magnetic type proximity switch, capacitance type proximity switch and temperature responsive switch, in addition to pushbutton switch, are usable as logic inputs to the system based upon two intermediate current levels. Shorted lines and open lines are detected by zero voltage and zero current levels, respectively. A variety of alternative outputs such as logic output and relay output are also useable in the system. In addition, tachometer and motion transducer systems with pulse inputs and pulse integrator and non-volatile memory outputs, respectively, are further possible modifications of the system.

REFERENCES:
patent: 3665461 (1972-05-01), Gnagi et al.
patent: 3699569 (1972-10-01), Lee

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