PLC Features

(1) High reliability. Since most PLCs use single-chip microcomputers, they are highly integrated. In addition, the corresponding protection circuits and self-diagnosis functions improve the reliability of the system.
(2) Easy programming. PLC programming mostly uses relay control ladder diagrams and command statements, which are much fewer than microcomputer instructions. Except for medium and high-end PLCs, general small PLCs only have about 16 instructions. Since the ladder diagram is vivid and simple, it is easy to master and use, and even no computer expertise is required to program.
(3) Flexible configuration. Since PLC uses a building block structure, users only need to simply combine them to flexibly change the function and scale of the control system. Therefore, it can be applied to any control system.
(4) Complete input/output function modules. One of the biggest advantages of PLC is that for different field signals (such as DC or AC, switch quantity, digital quantity or analog quantity, voltage or current, etc.), there are corresponding templates that can be directly connected to industrial field devices (such as buttons, switches, sensor current transmitters, motor starters or control valves, etc.), and connected to the CPU motherboard through the bus.
(5) Easy installation. Compared with computer systems, the installation of PLC does not require a dedicated machine room or strict shielding measures. When in use, you only need to correctly connect the detection device to the actuator and the I/O interface terminal of the PLC to work normally.
(6) Fast operation speed. Since the control of PLC is executed by program control, its reliability and operation speed are incomparable to relay logic control.
In recent years, the use of microprocessors, especially with the large-scale adoption of single-chip microcomputers, has greatly enhanced the capabilities of PLCs and made the difference between PLCs and microcomputer control systems smaller and smaller, especially for high-end PLCs.