PLC is a programmable controller , the scope of application is very extensive. When users use the PLC for PLC knowledge of how much it, PLC and relay advantages compared to what we all know, the following instrumentation World Network Xiaobian come to a detailed introduction about it.

1, strong function, high cost performance

There are hundreds of user-programmable programming elements in a small PLC that have great capabilities for very complex control functions. Compared with the same function of the relay, with a high cost performance. Programmable controller can communicate through the network, decentralized control, centralized management.

2, complete hardware support, user-friendly, adaptable

Programmable controller products have been standardized, serialized, modular, equipped with a full range of hardware devices for users to choose. Users can be flexible and convenient system configuration, composition of different functions, not scale system. Lo programming controller wiring is also very easy to install, the general use of external terminals to connect wiring. PLC has a strong load capacity, you can directly drive the general solenoid valve and AC contactor .

3, high reliability, anti-interference ability

The traditional relay control system uses a large number of intermediate relays, time relays. Due to poor contacts, prone to failure, PLC software to replace a large number of intermediate relays and time relays, leaving only a small amount of input and output related hardware, wiring can reduce mutual relay control system 1 / 10--1 / 100 , Due to poor contact caused by the contact greatly reduced.

PLC has taken a series of hardware and software anti-jamming measures, has a strong anti-interference ability, MTBF tens of thousands of hours or more, can be used directly in industrial production site has a strong interference, PLC has been recognized as the majority of users Reliable industrial control equipment.

4, the system design, installation, commissioning less workload

PLC software replaces the relay control system with a large number of intermediate relays, time relays, counters and other devices, the control cabinet design, installation, wiring workload greatly reduced.

PLC ladder program generally uses sequential control design. This programming method is very regular, very easy to grasp. For complex control systems, ladder design time than the design of the relay system circuit diagram much less time.

PLC user program can be simulated in the laboratory test, the input signal with a small switch to simulate the PLC through the light-emitting diode can observe the status of the output signal. After completing the installation and wiring of the system, the problems found in the process of site tuning are generally solved by modifying the program, and the debugging time of the system is much less than that of the relay system.

5, programming method is simple

Ladder is the most widely used programmable logic controller programming language, the circuit symbols and expressions and relay circuit diagram is similar to the ladder language intuitive visual language, easy to understand, familiar with the relay circuit diagram of electrical technicians just take a few days Time can be familiar with the ladder language, and used to prepare the user program.

Ladder language is actually a user-oriented high-level language, programmable logic controller in the implementation of the ladder program, the interpreter to translate it into assembly language to execute.

6, less maintenance work, easy maintenance

PLC failure rate is very low, and has improved self-diagnosis and display capabilities. PLC or external input devices and actuators in the event of failure, according to the PLC or LED on the programmer provides shelter quickly identify the cause of the malfunction, with the replacement of the module can quickly troubleshooting.

7, small size, low energy consumption

For complex control systems, the use of a PLC reduces the need for a large number of intermediate relays and time relays. The size of a small PLC is equivalent to several relays, reducing the size of the switchgear to 1 / 2-1 / 10.

The advantages of PLC and relays have been introduced over, PLC wiring wiring than the relay control system is much less, it can save a lot of wiring and accessories, reducing the installation of a large number of man hours, can reduce the cost.

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