PLC generally refers to a programmable logic controller. Programmable Logic Controller is a digital computing operation electronic system specially designed for application in industrial environments. It uses a programmable memory that stores instructions for performing operations such as logic operations, sequence control, timing, counting, and arithmetic operations, and controls various types of mechanical equipment or production through digital or analog input and output. process.
power supply
The power supply is used to convert the AC power into the DC power required inside the PLC. At present, most PLCs use a switching regulator power supply.
Central processing unit (CPU)
The central processing unit is the control center of the PLC and the core component of the PLC. Its performance determines the performance of the PLC.
The central processing unit is composed of a controller, an arithmetic unit and a register. These circuits are concentrated on one chip and connected to the input/output interface circuit of the memory through an address bus and a control bus. The role of the central processor is to process and run user programs, perform logical and mathematical operations, and control the entire system to coordinate.
Memory
Memory is a semiconductor circuit with memory function that stores system programs, user programs, logic variables, and other information. The system program is a program that controls the PLC to implement various functions, is written by the PLC manufacturer, and is solidified into a read-only memory (ROM), which the user cannot access.
Input unit
The input unit is an input interface between the PLC and the controlled device. It is a bridge for the signal to enter the PLC. Its function is to receive the signal from the main component and the detection component. The input types are DC input, AC input, AC and DC input.
Output unit
The output unit is also a connection component between the PLC and the controlled device, and its function is to transmit the output signal of the PLC to the controlled device, that is, convert the weak electric signal sent by the central processor into a level signal, and drive the actuator of the controlled device. . The types of outputs are relay output, transistor output, and gate output.
In addition to the above parts, PLC has a variety of external devices depending on the model. Its function is to help programming, monitor and network communication. Commonly used external devices are programmers, printers, cassette tape recorders, computers, and the like.
The simple input of the PLC is: GND and X, which supports all digital inputs. The selected switch needs to be npn.no type, normally open.
1. Connection of the sensor:
1 magnetic sensor, 2 lines, generally Blue (blue) connected to GND, Brown (brown) connected to the input X.
2 photoelectric sensor, 3-wire, generally Blue (blue) connected to GND, Black (black) connected to the input X, Brown (brown) connected to 24v.
2, the travel switch, 2 lines, the travel switch has no positive and negative poles, select NO one to connect to the input terminal X, select another to connect to GND.
Selection of switching power supply: It is best to use Taiwan Mingwei switching power supply, DC 24v output.
The output of the simple thinking PLC is: COM terminal and Y terminal, COM terminal is connected to 0V, and Y terminal is output control terminal. Simple thinking PLC can directly drive the DC24V cylinder solenoid valve, the output terminal can be directly controlled within 6W, the high power load, that is, the power "6W load", PLC can not be directly driven, need to use DC24V intermediate relay to transfer.
1. Solenoid valve selection: If the pneumatic control is directly selected from the 24v solenoid valve, it can be directly connected to the controller for use.
2, hydraulic valve control: hydraulic control is generally 220v control, if you use the controller to control 220v, the middle needs a voltage over, choose 24v relay transfer.
3, ordinary motor control: motor control requires two over, because 380V high voltage, you need an intermediate relay and AC contactor, you can buy 24v AC contactor.
4. Stepper/servo motor control: Simple thinking PLC supporting axis movement There is no special requirement for the selection of stepping and servo motor models. PLC can directly connect the drive of stepper/servo motor.
1, SF-1616A2MT wiring diagram
PLC and stepper motor / servo motor wiring:
2, SF-1008A0MT wiring diagram:
3, SF-0805A0MT wiring diagram:
Recommended reading: a text to understand PLC and proximity switch wiring method and wiring diagram
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