小小米珠
At present, PLC spins in already having applied to iron and steel , petrochemical industry, electric power , building material , machinofacture , automobile broadly , making light of at home and abroad , traffic , environmental protection reach culture entertainment and so on industry , usage condition are summed up as one by one basically for resembling as follows almost. The amounts logics control a switch This is fundamental , the broadest PLC application field , it substitutes the tradition relay circuit , the logic controls , order controls realization, charge reaching the automation production line now that controlling may be used for Shan platform equipment, also may be used for many fleets. If the injection machine , the printing machine, subscribe a book, machinery, constitutes machine tool , grinder , package production line , electroplating production line etc. Simulation amounts are controlled In industry, procedure of production amounts having a lot of continuous change in the middle,if the temperature , pressure , rate of flow , liquid place and speed etc. all are to simulate amounts. Change for making programming controller handle A/D between the amounts (Analog) and figure amount (Digital) simulating amounts , realizing a simulation be obliged to changing reaching D/A. Supporting A/D and D/A the PLC manufacturer is all produced changes a module , the amounts messenger programming controller be used to simulate control. Motion is controlled Can be used for circling motion or rectilinear motion of PLC controlling. From that control organ allocation comes, direct be used for I/O early phase switch amounts modules link location sensor and actuating mechanism , use special-purpose motion under the control of module like now. If may drive step-by-step electric motor or the servo electric motor, single axis or polyaxis location controls a module. Every product of main PLC manufacturer controls almost It both moves a function in the world , is used for occasion such as various machinery , machine tool , robot , electric elevator broadly. Process control Process control is to refer to the closed cycle under the control of simulating amounts's to the temperature , pressure , rate of flow etc.Can weave the all kinds of control algolithm program , accomplish closed cycle under the control of as industrial control computer , PLC. That PID is adjusted is that general closed cycle navar is so useful as to adjust method comparatively muchly. Big medium-sized PLC It both PID module, at present a lot of minitype PLC also has this function module. That PID handles a sort is to run the special-purpose PID functional element program. Process control has applying very broadly in occasion such as metallurgy , chemical industry , heat treatment , boiler under the control of.
