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Anonymous users2024-02-06PLC automation mainly relies on a variety of sensors, PLC only does to process the standard signals transmitted by various sensors and then output the standard signals to the sensor, what these standard signals do, it depends on what the sensor is used for.
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Anonymous users2024-02-05Similar to relay control, but now a lot of functions have been added, and that thing was originally developed from relay control.
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Anonymous users2024-02-04The interior is actually equivalent to a microcontroller. Programmable control.
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Anonymous users2024-02-03Enter the meaning:It is the bridge for the signal to enter the PLC, and its function is to receive the signal from the main element and the detection element. The types of inputs are DC input, AC input, and AC and DC input.
Output Significance:The connection between the PLC and the controlled equipment, it can transmit the output signal of the PLC to the controlled equipment, that is, the weak current signal sent by the ** processor is converted into a level signal to drive the executive element of the controlled equipment. The types of outputs are relay output, transistor output, and crystal gate output.
The principle of input sampling and output refresh
1. Input sampling.
During the input sampling phase, the PLC reads all input states and data sequentially in a scanned manner and stores them in the corresponding cells in the IO image. After the input sampling is complete, it moves to the user program execution and output refresh phase. In both phases, even if the input state and data change, the state and data of the corresponding cells in the iO image area do not change.
2. Output refresh.
When the scanning user program is complete, the PLC enters the output refresh phase. During this period, the CPU flushes all output latch circuits according to the corresponding state and data in the I-O image area, and then drives the corresponding peripherals through the output circuits. This is where the actual output of the PLC comes in.
The above content refers to Encyclopedia-PLC
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Anonymous users2024-02-02The input is right, the output is wrong, and the output is generally crystal type (transistor drive) or relay type (relay drive), and generally does not use optocoupler isolation. Especially for high-speed output, the corresponding speed of the optocoupler is not good.
It is correct that the output light is not connected to the power supply externally, because the output is controlled by the program, and the program gives that the output terminal is closed, and this indicator light will be on. It has nothing to do with external wiring. Hope to adopt.
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Anonymous users2024-02-01The first floor is correct, thank you, I learned.
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Anonymous users2024-01-31Brand model: Huawei MateBook D15
System: Windows 11
PLC input is the command signal sent by the person to the PLC. These commands are implemented through various switches, buttons, limits, temperature sensors, potentiometers, and more. PLC output, that is, PLC to drive machinery and equipment, is achieved by relays, thyristors, and transistors.
And these are the three types of PLC output, which realize the control of the machine automation terminal.
The input unit is the input interface connected between the PLC and the controlled equipment, and is the bridge for the signal to enter the PLC, and its function is to receive the signal from the main command element and the detection element. The types of inputs are DC input, AC input, and AC and DC input. The potato conveying unit is also the connection component between the PLC and the controlled equipment, and its function is to transmit the output signal of the PLC to the controlled equipment, that is, to convert the weak current signal sent by the processor into a level signal to drive the executive element of the controlled equipment.
The types of output include relay filial high device output, transistor output, and crystal gate output.
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