What is the difference between PLC and relay -

PLC controller control system in the traditional relay control system is developed on the basis of, compared with advantages of need, first of all, the hardware wiring simplifies many, PLC controller built-in timer, counter, auxiliary relay, and normally open contacts and normally closed contacts can be unlimited use so as to greatly reduce the use of electrical components and reduce the complexity of the connecting line.

PLC controller control system with basic logic control function, can also realize the numerical calculation, visual processing and communication function can be directly with frequency converter, servo driver, and a variety of instruments to connect. With touch screen, configuration software to connect to the production process to implement dynamic visualization, ICONS, data storage, fault generated by a data record at a glance, greatly reduces the equipment operation difficulty.

so compared with the relay control system, PLC control system can realize control requirement, function more complex wiring of Jane, online debugging convenient, quickly and efficiently for a failure to find out, the later is more convenient for the maintenance of equipment, in particular, in terms of increasing modification function can be avoided by only need in the program to complete lines of changes significantly. Now basically all industrial control using PLC, but also no relay control system is eliminated, it can be used in some control requirements simple situation, after all the cost is very low.

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