Patent
Programmable logic controller
Ernst Dummermuth
- 24 May 1974
78
TL;DR: In this paper, an input/output scanner circuit connects directly to the read/write memory and periodically steals a memory cycle from the processor to couple the status of input and output devices with corresponding bits in the image tables.
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Abstract: A programmable controller includes a processor which executes a control program to alter the state of an output image table stored in a read/write memory in response to the state of an input image table stored in the memory. An input/output scanner circuit connects directly to the read/write memory and periodically steals a memory cycle from the processor to couple the status of input and output devices with corresponding bits in the input and output image tables. The rate at which the scanner circuit operates is independent of the processor speed and is selected to accommodate the input/output interface circuitry on the programmable controller.
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Citations
Patent
Programmable logic controller method, system and apparatus
Mark Steven Boggs,Temple Luke Fulton,Steve Hausman,Gary Mcnabb,Alan Mcnutt,Steven W. Stimmel +5 more
- 08 Dec 2000
TL;DR: In this article, a programmable logic controller with enhanced and extended capabilities is presented, where a digital input filter implements filters with considerable less logic by simulating the action of a capacitor being driven by a constant current source whose output voltage is sensed by a comparator with a large amount of hysterisis.
151
Patent
Programmable controller using microprocessor
William H. Seipp
- 01 Jul 1976
TL;DR: In this paper, a programmable controller comprising a standard microprocessor having output address terminals and input/output bi-directional data terminals and means for providing a binary code on the data terminals indicative of the status of the machine cycle to be processed by the microprocessor is provided.
110
Patent
Modular programmable controller
Ernst Dummermuth,Daniel J. Galdun,Raymond A. Grudowski,Daniel L. Stewart +3 more
- 21 Oct 1981
TL;DR: In this article, a programmable controller is formed by connecting separate functional modules to a common backplane bus, and a bus arbitration scheme and a message handling technique are disclosed to tightly couple the functional modules together to form an efficient programmable controllers.
101
Patent
Machine control system with machine serializing and safety circuits
Richard A. Mazur
- 09 Apr 1976
TL;DR: In this paper, a plurality of multi-functioning machines are simultaneously controlled by similar transmitter/receiver pairs, one of which is associated with a programmable controller and the other of which associated with machine.
92
Patent
Digital computer structure providing arithmetic and boolean logic operations, the latter controlling the former
John P. Conners
- 24 Sep 1976
TL;DR: In this paper, the logic processing is carried out in response to specially coded instruction words which may be randomly interspersed between conventional arithmetic instruction steps within an overall program, and very little added hardware is required to create the logic processor, storing, and dependent conditioning.
78
References
Patent
Programmable controller using a random access memory
W Seipp
- 29 Jan 1973
TL;DR: In this article, a programmable controller of the type used to process logic from input and output circuits for controlling the operation of machines, manufacturing processes and similar mechanical systems is described.
31
Patent
Multiple process control system
George R Smeallie
- 12 Aug 1969
TL;DR: In this article, a process control system employing a digital computer is described, where the computer develops control words from the data words by the execution of a command program and addresses a parallel control output interface.
26
Patent
Stored-logic real time monitoring and control system
Howard Leroy Wirsing
- 09 Mar 1970
TL;DR: In this paper, a stored-logic real-time monitoring and control system is presented, which includes a first storage device for sequentially storing the switching logic descriptions of a desired combinational sequential or the like logic function to be performed, and a second storage device to store the present input status to the switched logic descriptions.
9
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