Relay protection platform based on elemental and programmable logic;

Research of programmable logic microprocessor-based protection based on Matlab

To improve the applicability of the logic functions,programmable logic concepts are presented.

This paper discussed the arithmetic of phase adder and the frequency analysis of D/A converter in detail,and introduced the implement of direct digital frequency syntheses using programmable logic device.

The system uses FPGA as the master control chip,is an utility system based on embedded equipment,so the performance is more stable,in the meantime for the large capacity and flexibility of the programmable logic device,it can raise system s running rate greatly,may realize SOPC,and using the NIOSⅡ,a processor that had custom-made a.

Brings forward a design of logic programmable MC and MP,and details every aspect that is involved in the design and the strongpoints of this design compared with the other common designs of MC and MP.

According to the real conditions,a wireless distributed supervision system for an electronic cable tunnel of 1 700 meters is built,which is based on the programmable logic controller of S7-200.

To evaluate effectively the characteristics of firing frequency and projectile velocity measurement system of the high firingfrequency weapon system,a programmable control method based on programmable logic controller(PLC)is proposed.

This article illustrates the working principles of the single\|scrwed air compressor units, and by taking advantage of the technologe of PLC,the article has designed the soft and hard wares of the controling system of the single\|screwed air compressor units.