Boots – shoes – and leggings
Patent
1984-06-04
1986-06-03
Springborn, Harvey E.
Boots, shoes, and leggings
G06F 1300, G06F 100, G06F 900
Patent
active
045933804
ABSTRACT:
The invention disclosed provides circuitry which is selectively operable either as an input point or as an output point in a programmable controller having multiple input and output points for exchanging signals between a central processing unit (CPU) of the controller and a process being controlled. Preferably, operation as an input point or as an output point is under control of the CPU. The invention includes a common input/output terminal for terminating both input and output devices; an input return terminal for terminating a return conductor from the input device; an output return terminal for terminating a return conductor from the output device; a preload resistor connected between the input/output terminal and the output return terminal so that a status signal is developed across the preload resistor indicating the status (generally, open or closed) of the input device; and an insulated gate transistor (IGT) connected between the input/output terminal and the input return terminal. The insulated gate transistor, capable of being triggered on and off, is held in an off state whenever the circuit is selected to be operated as an input point and is triggered on and off when the circuit is selected to operate as an output point. Most preferably, the IGT includes a main current section and an emulation current section and is arranged such that a burden resistor in series with the emulation section provides a diagnostic signal indicative of total IGT current.
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Data sheets, RIFA Integrated Circuits PBD 3545 and PBD 3544 (2 pages each), RIFA-AB, Stockholm, Sweden.
"Smart ICS for Power Switching", Machine Design, May 10, 1984, pp. 60-65.
Digicable Manual, Direct Digital Industries, Inc., Lexington, KY.
Gareis Ronald E.
Ketelhut William J.
Kocher Mark J.
Konrad Charles E.
Austin Ormand R.
General Electric Co.
Niessen William G.
Springborn Harvey E.
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