Patent
Modular programmable controller
Ernst Dummermuth,Daniel J. Galdun,Raymond A. Grudowski,Daniel L. Stewart +3 more
- 21 Oct 1981
101
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.
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Abstract: A programmable controller is formed by connecting separate functional modules to a common backplane bus A bus arbitration scheme and a message handling technique are disclosed to tightly couple the functional modules together to form an efficient programmable controller A number of improvements to the CPU module and I/O scanner module are disclosed to further improve the performance of the resulting system
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References
Patent
Programmable logic controller
Ernst Dummermuth
- 24 May 1974
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.
78
Patent
Digital computer-industrial controller system and apparatus
William E Fletcher,Leon B Rosseau +1 more
- 11 Dec 1969
TL;DR: In this paper, a small general purpose digital computer is utilized as the basic element of an industrial controller, where the computer is provided with an executive program comprising function simulating modules.
68
Patent
Microprogrammed programmable controller
Odo J. Struger,Ernst Dummermuth +1 more
- 26 Feb 1980
TL;DR: A programmable controller includes a processor formed around a pair of four-bit bipolar microprocessors as mentioned in this paper, and it is executed by sequentially mapping each macroinstruction operation code into a corresponding microroutine which is stored in a read-only memory.
28
Patent
Automatic end-of-scan control system for a programmable process controller with expandable memory
Gim P. Hom
- 24 Aug 1978
TL;DR: In this article, an intelligent programmable process control system is presented, which includes a microprocessor which sequentially scans an addressable memory to execute a sequence of boolean logic instructions in accordance with the states of the sensors to control the controllable devices accordingly.
24
Patent
Programmable data processor and controller system
William J. Danco
- 17 Jun 1974
TL;DR: In this paper, a data processor/controller contains a program representative of a logic configuration required to control the sequencing of operations in equipment external to the data processor and includes means for accumulating results of a plurality of logic operations as specified by the program and providing a final result representative of conditions in the logic configuration.
17
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