Description
The Programmable Logic Controller was first introduced in the United States in the late 1960s, when it was called the Programmable Logic Controller (PLC), which was used to replace relays. To perform logical judgment, timing, counting and other sequential control functions. The concept of PLC was proposed by General Motors. The basic design idea of PLC is to combine the advantages of computer function perfect, flexible, universal and relay control system simple and easy to understand, easy to operate, cheap and so on, the controller hardware is standard and universal. According to the actual application object, the control content is compiled into software and written into the user program memory of the controller, so that the connection between the controller and the controlled object is convenient. PLC features and functions (1) The main characteristics of plc. The characteristics of plc are: reliable work, fast running speed, building block structure, flexible combination, good compatibility, simple programming and generation, rich, strong network function. (2) The main functions of plc. plc system can well complete the industrial real-time sequence control, condition control, counting control, step control and other functions; It can complete analog/digital (a/d), digital/analog (d/a) conversion, data processing, communication networking, real-time monitoring and other functions. Years of practice shows that plc, reliable, is designed for the factory, with reinforced components according to the requirements of the working environment, real-time scanning practice and fault diagnosis function, easy troubleshooting, won the preference of users. What makes a plc so reliable is a real-time core or operating system of executable relay logic, sequential function diagrams, function blocks, structured text, command catalogs, or a combination thereof. In case of failure, the built-in device can maintain mechanical damage and maintain an orderly and predictable sequence. 2.4 The development trend of plc: there are extremely fast logical operations and logic control, sequence control capabilities, reliability in discrete control, convenient and easy to learn programming methods, so that it has an undisputed position in the field of industrial automation based on discrete.
The role of the thyristor
Thyristor is an important power control device, which plays a key role in the field of electronics and power. Its main function is to control the current flow and realize the switch and regulation of power. The following are the main functions of thyristors:
(1) Power switch control
The thyristor can be used as a power switch to control the on-off of the circuit. When the control voltage of the thyristor reaches a certain level, it switches from the off state to the on state, allowing the current to pass through. This switching characteristic makes thyristors widely used in the distribution and control of power systems, such as controlling motors, electric furnaces, lamps and so on.
(2) Current regulation and converter
By controlling the trigger Angle of the thyristor, the current in the circuit can be adjusted to achieve accurate current regulation. This is useful in applications where precise current control is required, such as resistance heating, AC motor speed regulation, and so on.
(3) AC-DC conversion
Thyristors can convert alternating current to direct current, which is useful in some specific applications, such as DC motor drive, DC power acquisition, etc.
(4) Voltage control
The thyristor can also be used to control the voltage of the circuit, and the voltage waveform can be adjusted by controlling the trigger Angle of the thyristor.
(5) Power factor correction
Thyristors can be used to improve the power factor of power systems. By controlling the conduction Angle of the thyristor, a certain harmonic current can be generated in the circuit to improve the power factor of the system.
Power stability improvement: In power systems, thyristors can be used to adjust voltage and current, thereby improving the stability of the power system and reducing voltage fluctuations and electrical surges in the power system.
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