At present, the common control method of plantation shutters online is to manually open and close the plantation shutters online. Manual opening and closing is time-consuming and laborious, and may cause certain troubles to users.
Automatic plantation shutters online can solve these problems to a large extent. This project introduces a design scheme of a plantation shutters online control system, which mainly includes the analysis of the control requirements of the plantation shutters online, the theoretical design of the control system and the programming of the control system. In the demand analysis, the functions that the control system should meet in the actual use process are introduced; in the theoretical design, the selection of the controller, the selection of the signal input components, the selection of the power unit and the design of the protection circuit are mainly introduced; in the program design, the programming is introduced ideas, and a description of the main program.
With the continuous progress of modern technology, people put forward higher requirements for the living environment. On the premise of satisfying basic material needs, begin to pursue higher spiritual enjoyment. The design of the plantation shutters online control system is to solve the inconvenience of manual opening and closing, and at the same time, it can highlight the grade of life, and it can also automatically adjust the indoor brightness according to the outdoor illumination, further satisfying people’s needs for fun.
The designed plantation shutters online curtain control system is mainly for the place where large plantation shutters online are installed. According to the actual application requirements, the following basic functional requirements are now made for the automatic curtain control system designed this time: Mode I: The user presses Press the button to control the opening and closing of the plantation shutters online, which can realize semi-automatic control; Mode II: Receive the light intensity through the light sensor, and send the signal to the PLC controller, and compare it with the preset light intensity value of the system. Then the system automatically opens and closes the plantation shutters online and controls the degree of opening and closing of the plantation shutters online, which can realize fully automatic control.
The working principle of this design is briefly described as follows: In Mode II, the plantation shutters online control system can detect the light intensity, and then open and close the plantation shutters online, and can also use the buttons to control the opening and closing of the plantation shutters online. The sensor is a high-precision illuminance transmitter with a range of 0lux~65535lux. The signal collected from the illuminance transmitter is processed by analog-to-digital conversion and sent to the PLC controller. The grade range of 5 groups of LUX values is preset in the PLC controller, and the received LUX value is compared with the LUX value set by the system. In different grade ranges, the PLC controls the curtain to make different responses: (1 ) The received LUX value is in the I-level range, and the PLC controls the plantation shutters online to close. (2) The received LUX value is in the level II range, and the PLC controls the plantation shutters online to open slightly. (3) The received LUX value is in the level III range, and the PLC controls the plantation shutters online to fully open. (4) The received LUX value is in the IV level range, and the PLC controls the plantation shutters online to be half-open. (5) The received LUX value is in the V-level range, and the PLC controls the plantation shutters online to close. The action of PLC control curtain is mainly realized by stepper motor, PLC outputs high-speed pulse to stepper motor controller, and the stepper motor controls the number of turns and angle of rotation by the number of received pulses. The mode I of this plantation shutters online control system is controlled by the external button control module of the PLC controller. When the external button is pressed and lifted, a high and low level change will occur. When the PLC controller captures this change, it determines which button the signal comes from, compares it with the predefined button function, and then outputs a high-speed pulse. The control signal is sent to the stepper motor, which further controls the opening and closing of the plantation shutters online and the degree of opening and closing of the plantation shutters online. The above circuit modules are connected together to form the basic circuit of this design.
It can be seen from the above overall design that the plantation shutters online control device adopts PLC as the main control module, the signal detection terminal is composed of photoelectric sensors and buttons, and the stepping motor is used as the main power device. The main components of the circuit are power circuit, stepper motor drive
moving circuit, button circuit, light receiving circuit, limit circuit, etc.
3.1 The controller selection adopts ST30 of Siemens SMART PLC series, with 12 input contacts and 18 output contacts, including three high-speed pulse output contacts, which can directly control the stepping motor.
3.2 The analog quantity conversion module adopts Siemens AI04 analog quantity input module, there are four groups of analog quantity input, only one of them is used here: AI0+ and AI0-.
3.3 Power Module using MEAN WELL LRS-200-24 switching power supply, 220V AC input, 24V DC output, the maximum power is 211.2W. The power module has three input terminals, which are respectively connected to the live wire, neutral wire and ground wire of 220V voltage; there are four sets of output terminals. Due to the different working environments of the working elements of the control system, the voltage source needs to be isolated. One set of output terminals of the power module is connected to the PLC is connected with AI04 analog input module, one group is connected with the power input terminal of stepper motor driver and illuminance transmitter, and the other two groups are temporarily unused.
3.4 The stepping motor of the power unit adopts 57BYG250B, and the model of the driver used with it is TB6600. The connection between the stepper motor driver and the stepper motor has been explained above, and the wiring diagram is given. Since the direct access voltage of the controller is 5V, and the output control signal of the PLC is 24V, each circuit needs to be connected in series with a current limiting resistor R, otherwise the stepper motor driver will be burned out. Looking at the driver parameter table, it can be seen that the internal resistance of the driver is about: R=400Ω, so the resistance value of the resistor that needs to be connected in series is: R1=400÷5×24≈2000Ω.
3.5 The light sensor high-precision illuminance transmitter has four output leads in total, among which the brown lead is connected to the positive power supply; the black lead is connected to the negative of the power supply; the blue lead is the positive output of the illuminance signal, and is connected to the AI04 analog input contact 0+; the green lead is Illumination signal output is negative, connect to AI04 analog input contact 0-.
3.6 The button circuit consists of a single-pole double-throw switch and three jog buttons; the single-pole double-throw switch has three pin outputs, one is the common terminal, and the other two are the control terminals. The three contacts are led out by three wires, the common terminal is connected to 1L+ of the PLC, and the other two contacts are respectively connected to 0.0 and 0.7. The jog button has two colors of red and green. The two green buttons represent the on and off of the button control respectively. The red button is the reset button. When the red button is pressed, the stepping motor rotates forward. When the proximity switch is turned on, the motor decelerates, and after stopping, it goes back a certain distance to complete the reset. Each button has two output pins, which are normally disconnected. When the button is pressed, the two pins are connected, and the PLC can receive the signal of the button. When wiring, one of the pins of each button can be connected in common, and the other pin can be connected to the PLC input contact.
3.7 The limit circuit adopts CHE12-4NA-A710 proximity switch, which can detect metal materials. The proximity switch has three leads, two of which are connected to the positive and negative of the power supply respectively, and the other signal line is connected to the I1.0 interface of the PLC, which is used for the motor to find the reference point. The various modules are linked together by the PLC controller. Each module cooperates with each other to realize the functions of automatic opening and closing of plantation shutters online and manual opening and closing.
This program design mainly uses STEP 7-MicroWIN SMART programming software, which can be connected to PLC for online debugging. The software design is mainly composed of the following parts: control system initialization, motion control subroutine, button subroutine, limit Bit programs, stepper motor control programs, etc. In the software design part, the main program of the automatic curtain controller and the design process of some subprograms are mainly introduced.
After receiving the light intensity signal, the illuminance sensor outputs a voltage signal of 0~10V. As the light intensity increases, the output voltage increases. The output voltage enters the analog input module, where the analog quantity is converted into a digital quantity, and the calculation process is shown in the figure.
For example: Assume the current output signal is: the range of known light intensity is 0-65535LUX. It can be found in the smart technical specification that the full scale range of the analog input module is: -27648~27648. Since the light intensity value is larger than the range of the analog input module, the converted value here is not the actual light intensity value, and the actual value can be calculated through the corresponding relationship between it and the range. The corresponding relationship between voltage and range in the program is:
VD=[(OSH-OSL)*(V-ISL)/(ISH-ISL)]+OSL In the above formula, the meaning of each variable is: VD: the result of the program output; V: the actual input voltage value ;OSH: the upper limit of the analog input module range; OSL: the lower limit of the analog input module range; ISH: input maximum voltage value; ISL: input minimum voltage value. The actual illuminance value can be obtained from the calculation result of the above formula: E=VD×65535/27648 LUX.
There is a motion control wizard in the programming software. First, you need to set the required parameters in the wizard, and then generate a callable routine. Four calling routines are shared here, namely: AXISx_CTRL subroutine, AXISx_MAN subroutine, AXISx_GOTO subroutine and AXISx_RSEEK subroutine. For the specific usage of the above routines, please refer to the PLC technical manual, which will not be detailed here.
In the overall program design, it is necessary to consider the logic of internal signal processing when the system is working. After the automatic curtain control system is powered on, it first judges the current working mode.
The controller divides the light intensity of the light sensor into 5 levels. When the light value is detected, the PLC controller determines which range the current light intensity belongs to, and makes corresponding actions. If it is detected that the current working mode is manual mode, the PLC controller detects the signal of the button. After receiving the button signal, the PLC controller determines whether the pressing time exceeds 500ms (that is, it determines whether the button is pressed for a short time or the button is pressed for a long time), and does take appropriate action. So far, the design of the entire plantation shutters online control system is completed. It can meet the basic functional requirements of the above design. Due to the high cost of automatic plantation shutters online, it is difficult for ordinary families to accept it. Therefore, the functional requirements of the automatic curtain control system designed this time are mainly for the places where large-scale plantation shutters online are installed, and at the same time, it can be applied to space plantation shutters online, floor-to-ceiling plantation shutters online, etc.
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