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Programmable logic controllers (PLCs) are digitally operated electronic systems designed for industrial applications.
It uses a programmable memory to execute logic operations, sequence control, timing, counting and arithmetic operations and other operational instructions in its internal memory, and controls various mechanical equipment or production processes through digital or analog input and output.
Product Introduction
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Mini PLC Controller Basic Structure
A PLC is essentially a computer specially designed for industrial control. Its hardware structure is basically the same as that of a microcomputer. It basically consists of power supply, central processing unit, memory, input unit and output unit.
1. Power supply: used to convert alternating current into direct current required by PLC. At present, most PLCs are powered by switching regulated power supplies.
2. Central Processing Unit (CPU): The CPU is the control center and the core part of the PLC. Its performance determines the performance of the PLC.
3. Memory: It is a semiconductor circuit with memory function, which is used to store system programs, user programs, logic variables and other information.
4. Input unit: It is the input interface between the PLC and the controlled device, and it is the bridge for the signal to enter the PLC. Its function is to receive signals from the main command element and the detection element.
5. Output unit: It is also the connection between the PLC and the controlled device. Its function is to send the output signal of the PLC to the controlled device, that is, the CPU converts the weak signal into a level signal, and then drives and executes the controlled device.
Apply generalization
1. Open loop control
The open-loop control of the switch is the most basic control function of PLC.
2. Analog closed loop
For the analog closed-loop control system, in addition to the digital input and output, there are also analog input and output points.
3. Digital control
When the control system has rotary encoder and pulse servo device, PLC can realize the function of receiving and outputting high-speed pulse, and realize digital control.
4. Data collection and monitoring
Since PLC is mainly used for field control, collecting field data is a very necessary function. On this basis, PLC is connected with the host computer or touch screen, which can not only observe the current value of these data, but also conduct statistical analysis in time.
Tecoo, as a professional electronic manufacturing service provider, provides OEM and customization services for mini PLC controllers.
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