1B30023H01 OVATION
PLC is an electronic device designed specifically for digital operation in industrial environments. It uses programmable memory to store instructions for performing logical operations, sequential operations, timing, counting, and arithmetic operations internally, and can control various types of mechanical or production processes through digital or analog inputs and outputs. The PLC and its related peripheral devices should be designed based on the principle of easy integration with industrial control systems and easy expansion of their functions
High reliability is a key performance of electrical control equipment. Due to the use of modern large-scale integrated circuit technology, strict production processes, and advanced anti-interference technology for internal circuits, PLC has high reliability. For example, the F series PLC produced by Mitsubishi has an average time between failures of up to 300000 hours. Some PLCs that use redundant CPUs have longer mean time between failures. From the perspective of the external circuit of PLC, using PLC to form a control system, compared to similar scale relay contactor systems, the electrical wiring and switch contacts have been reduced to hundreds or even thousands of times, greatly reducing faults. In addition, the PLC has a hardware fault self detection function, which can send out alarm messages in a timely manner when a fault occurs. In the application software, the application can also program fault self-diagnosis programs for peripheral devices, enabling circuits and equipment in the system other than PLC to also receive fault self-diagnosis protection. In this way, it is not surprising that the entire system has extremely high reliability.
As a general industrial control computer, PLC is an industrial control equipment for industrial and mining enterprises. It has an easy interface and programming language that is easily accepted by engineering and technical personnel. The graphical symbols and expression of ladder diagram language are quite similar to that of relay circuit diagrams, and the functions of relay circuits can be easily achieved with only a small amount of PLC switch logic control instructions. This opens the door to industrial control using computers for those who are unfamiliar with electronic circuits, computer principles, and assembly language.
PLC replaces wiring logic with storage logic, greatly reducing the external wiring of control equipment, greatly shortening the design and construction cycle of the control system, and making maintenance easier. More importantly, it is possible to change the production process of the same equipment through program changes. This is very suitable for production scenarios with multiple varieties and small batches.
