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Prevention of Computer Errors Due to External Transients

IP.com Disclosure Number: IPCOM000098512D
Original Publication Date: 1960-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Jimerson, LS: AUTHOR [+2]

Abstract

Through the use of transient detection devices and program techniques, the effect of malfunction producing transients in a process control problem are minimized.

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Prevention of Computer Errors Due to External Transients

Through the use of transient detection devices and program techniques, the effect of malfunction producing transients in a process control problem are minimized.

A general purpose computer used for solving a process control problem often has input quantities which cannot be instantaneously measured and read into the computer. For example, these input quantities may be of the type accumulated in the computer memory from incremental input information. Other quantities are read into the computer as new input information every computation cycle. External transients can cause the writing of erroneous information into memory during the updating of an accumulated quantity. An error of this type is not readily correctable.

Errors may be averted by storing each accumulated quantity in three different locations in memory and adding to each, incrementally, at three different times, i.
e., successively. On the occurrence of a transient, the further writing of data into memory is prevented. Therefore, only one of the entries of an accumulated quantity into memory is in error as the result of a single transient. Upon termination of the transient, the computer is commanded to drop back to an appropriate point in the computation cycle and start re-constructing the problem.

The program compares the three memory locations assigned to each accumulated quantity. Agreement of any two locations of three identifies the quantity a...