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The characteristics of the PLC control system

by:Coolmay     2020-08-17
The characteristics of the PLC control system

1, easy to use, simple programming

using simple ladder diagram, logic diagram or statements, such as programming language, without the need for computer knowledge, so the system development cycle is short, the scene debugging easier. In addition, can modify the program online, change control scheme without open hardware.

2, strong function, high cost performance

there are hundreds of thousands of a small PLC programming components available to the user, has a strong function, can achieve very complicated control function. It compared with the same function of relay system, has the very high cost performance. PLC can be realized through the communication network, distributed control, centralized management.

3, hardware supporting complete, the user use convenient, strong adaptability

PLC products have been standardization, seriation, modularization, equipped with complete varieties of all kinds of hardware device for user selection, users can be easily to carry on the system configuration, flexible system of different functions, different scale. PLC controller is also easy to install wiring, generally use external connection terminals. PLC has strong load capacity, can direct drive general solenoid valve and small ac contactor.

4, high reliability, strong anti-interference ability

traditional relay control system USES the plenty of intermediate relay, time relay, due to the contact point contact undesirable, prone to failure. PLC controller software replaced plenty of intermediate relay and time relay, only a small amount of hardware components related to the input and output, the connection can be reduced to 1/10 of the relay control system, 1/100, greatly reduced because of failure, which is usually caused by poor contact point contact.

PLC has adopted a series of hardware and software anti-interference measures, strong anti-interference ability, MTBF reaching tens of thousands of hours, can be directly applied to industrial production field have a strong interference, PLC has been the broad masses of users recognized as one of the most reliable industrial control equipment.

5, system design, installation, debugging workload less

PLC ladder diagram program generally sequential control design method is used to design. This programming method is very regular, easy to master. For complex control system, and design of ladder diagram than relay system which has the function of the same circuit diagram of time is much less.

the PLC user program can be simulated in the laboratory debugging, the input signal with a small switch to simulate, through the PLC on the light emitting diode can observe the state of the output signal. After completed the system installation and wiring, in the field of unit adjustment problems found in the course of the general can solve by modifying the program, system debugging are much less time than the relay system.

6, maintenance workload small, convenient maintenance

PLC failure rate is very low, and improve the diagnosis and display function. PLC or external input device and actuator failure occurs, can according to the light emitting diode or on the PLC programmer information quickly find out the cause of the failure, use the method of replacement modules can troubleshoot quickly.


Shenzhen Coolmay Technology Co., Ltd. is a company that offers a wide selection of . OEM and ODM services are also available to users. To know more, go to Coolmay PLC.
We are dedicated to providing you with more than just customer service by utilizing our qualified team who pride themselves on meeting and exceeding customer's needs. We also have ell-equipped plantin China with advanced facilities to manufacture programmable control systems plc manufacturers products according to customers requirements. Welcome to send your enquiry and visit our factory. Our website is Coolmay PLC.
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