Abstract
The paper considers several logical variables transmission describing regular and emergency modes of op- erations of the inspected control object by means of a single-channel communication line. The method is based on multizone frequency-width-pulse modulation. The block diagram of receiving and transmitting channels and example of modulation zones allocation algorithm between logical variables are given. The authors present the block diagram, time diagrams of signals and main equations for static and dynamic modes of the multizone frequency-pulse-width scanning converter with zero conjugation of modulation zones. The paper gives the results of analysis of the correlation between the number of relay elements and the number of modulation zones for the basic structure of the multizone integrating scanning converter. The block diagram of single-wire transmission system of the logic data about control object condition is considered. The principle of single-wire logic messages transfer is discussed. Algorithm of the modulation zones distribution on a code condition of the inspected control object is shown. The paper may be of interest for specialists in the field of power and information electronics, of the electric drive and automation of technological processes.
Highlights
The paper gives the results of analysis of the correlation between the number of relay elements and the number of modulation zones for the basic structure of the multizone integrating scanning converter
The paper may be of interest for specialists in the field of power and information electronics, of the electric drive and automation of technological processes
Устройства аналоговой и цифровой электроники. They show that: multizone integrating scanning converter (MSC) in each modulation zone is a system with frequency-pulse-width modulation
Summary
They show that: MSC in each modulation zone is a system with frequency-pulse-width modulation. Amplitude and mark Хi are chosen so that at switching on of the appropriate key element the target coordinate Yout (t) would appear in required modulation zone of the second or fourth quadrants of the “input – output” МSC characteristic, and with relative duration of pulses equals 0,5 As a result the signal “1” will be formed on a DМ output only of that channel of data division where the comparator C is in a mode of switching with pulses frequency appropriate MSC modulation zone. As the practice has shown, it is expedient to choose the frequency of MSC carrying fluctuations within the limits of 10–20 кHz. the modern element base allows creation of МSC to transfer up to the 30–40 logic data on control object condition along a single-wire communication line. It is necessary to take into account that with growth of number of MSC modulation zones the permissible level of the outside handicaps is reduced, as a result of amplitude modulation of the basic information carrier by a handicap signal that the comparators of adjacent data division channels can periodically turn from dynamic into static condition and vice versa [10–14]
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