Description
Overview
Essential details:XV9738a HEIE450617R1 programmable control card ABB
In 1987, the International Electrical Committee (International Electrical Committee) issued the PLC draft standard made the following definition of PLC:
“PLC is a digital computing operation of electronic devices designed specifically for use in industrial environments. It adopts a programmable memory used to store in it instructions for performing operations such as logical operations, sequential operations, timing, counting and arithmetic operations, and can control various types of machinery or production processes through digital or analog input and output. PLC and its related peripherals should be designed in accordance with the principle of easy to form a whole with the industrial control system, easy to expand its function.”
PLC software to replace a large number of intermediate relays and time relays, only a small amount of hardware related to the input and output, wiring can be reduced to the relay control system 1/10~1/100, due to poor contact caused by the fault greatly reduced.
High reliability is the key performance of electrical control equipment. PLC due to the use of modern large-scale integrated circuit technology, the use of strict production process manufacturing, internal circuit adopts advanced anti-interference technology, has high reliability. For example, F-series PLC produced by Mitsubishi Corporation has an average trouble-free time of up to 300,000 hours. Some PLCS that use redundant cpus have a longer average trouble-free operating time. From the PLC external circuit, the use of PLC control system, and the same scale of the relay contactor system, electrical wiring and switch contacts have been reduced to hundreds or even thousands of one, the fault is greatly reduced. In addition, PLC with hardware fault self-detection function, failure can send alarm information in time. In the application software, the user can also program the fault self-diagnosis program of peripheral devices, so that the circuit and equipment in the system except PLC also obtain fault self-diagnosis protection. Therefore, it is not surprising that the whole system has extremely high reliability.
The hardware is complete, the function is perfect, the applicability is strong
PLC development to today, has formed a large, medium and small scale of serialized products, and has been standardized, serialized, modular, equipped with a variety of complete hardware devices for users to choose, users can flexibly and conveniently to configure the system, composed of different functions, different scale of the system. PLC installation wiring is also very convenient, generally with wiring terminals to connect the external wiring. PLC has a strong load capacity, can directly drive the general solenoid valve and AC contactor, can be used for various scale of industrial control occasions. In addition to the logic processing function, most modern PLC has perfect data operation ability, can be used in a variety of digital control fields. In recent years, a large number of PLC functional units emerged, so that PLC has penetrated into the position control, temperature control, CNC and other industrial control. With the enhancement of PLC communication ability and the development of man-machine interface technology, it becomes very easy to use PLC to form various control systems.
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