CN104091492A - PLC experimental device - Google Patents

Abstract

The invention provides a PLC experimental device, the device is composed of a detection instrument, a touch screen, a stepping motor, a stepping motor driver, a power supply module, an input unit, an output unit, a PLC unit and a PLC expansion module; the output unit includes a frequency conversion device and indicator light; the experimental device is placed in the box; the touch screen is installed in the first area, the frequency converter, stepping motor, stepping motor driver, testing instrument, power module, input unit, output unit, PLC Units and PLC expansion modules are installed in the second area of the box. The PLC unit and the PLC expansion module are installed on the guide rail; the guide rail is fixed at the middle position of the second area. The invention improves the integration degree of experimental equipment, improves the working efficiency under different working conditions, saves the cost of purchasing various experimental instruments, is convenient to operate, has reasonable design of the experimental device, and improves stability and safety performance.

Description

A PLC experimental device

technical field

The invention relates to a PLC experiment device, in particular to a PLC-based teaching comprehensive experiment device.

Background technique

PLC (Programmable Logic Controller) is the core technology of modern automatic control system, widely used in the field of modern industrial automation control. It uses a type of programmable memory for its internal storage program, executes user-oriented instructions such as logic operations, sequence control, timing, counting and arithmetic operations, and controls various types of machinery through digital or analog input/output or production process.

At present, most engineering colleges and universities in the country offer PLC experimental courses for electromechanical majors. The conventional PLC test box can cooperate with other instruments to complete PLC routine experimental projects such as hardware configuration, network communication, and input programming, and can assist in the learning and development of PLC.

However, due to the wide range of professional content in the training design of maintenance electricians, senior technicians, technicians, and senior technicians, and the great leap in technology, the existing maintenance electrician teaching, training, and assessment equipment use a variety of different special equipment combination assessment forms. The cost is high, the operation is inconvenient, the preparation time for training and assessment is long, and the most important thing is that it is limited by the limited area of the environment, which is not conducive to the training and skill assessment of vocational college students and social personnel. Most of the training and assessment equipment are only designed to be used in a certain course. When it comes to other courses, new training and assessment equipment must be purchased, which increases the teaching cost. In addition, from the perspective of safety, the training and assessment equipment used by the school must be safe and reliable, so that the personal safety of the students can be guaranteed. Although the teachers will conduct safety education before class, the equipment produced by the teaching instrument company is now safe. Sex needs to be improved. In the teacher's teaching operation experiment, because several students operate a test bench at the same time, the teaching effect is not good. At the same time, PLC has high requirements for the power supply, anti-interference, and structural stability of the experimental load-bearing cabinet. Therefore, it is very important for a multi-platform PLC experimental device to take into account the above requirements and have multi-platform PLC features. A well-designed cabinet structure.

The present invention is an improvement aimed at the defects of low integration, instability, inconvenient operation, high cost, low safety and unreasonable structural design existing in the PLC experimental device in the prior art.

Contents of the invention

The invention provides a PLC experiment device, which solves the following technical problems: the use efficiency is improved, the experiment cost is reduced, the operation is convenient, the design of the experiment device is reasonable, and the stability and safety performance are improved.

The invention provides a PLC experiment device, which is composed of a detection instrument, a touch screen, a stepping motor, a stepping motor driver, a power supply module, an input unit, an output unit, a PLC unit and a PLC expansion module. The output unit includes a frequency converter and an indicator light. The experimental device is placed in a box, and the material of the box is wood. The touch screen is installed in the first area of the box, and the frequency converter, stepping motor, stepping motor driver, testing instrument, power supply module, input unit, output unit, PLC unit and PLC expansion module are installed in the The second area of the box. The first area is the observer's side, and the second area is the opposite side of the first area. The PLC expansion module is connected to the slot of the PLC unit through a cable; the PLC unit and the PLC expansion module are installed on the guide rail; the PLC expansion module is detachable and replaceable; the guide rail is fixed on the second The middle position of the area; the stepper motor and the stepper motor driver are fixed on one side of the guide rail; the frequency converter is fixed on the other side of the guide rail; the detection instrument, touch screen, frequency converter, stepper The motor, the stepper motor driver, the power supply module, the input unit, the output unit, the PLC unit and the PLC expansion module are selectively connected through wires or signal wires. There is more than one detection instrument, which is used to detect voltage signal, current signal, power signal, frequency signal and power factor. The power module includes an AC power supply, a DC stabilized power supply and a power switch. The AC power supply is a three-phase four-wire power supply or a three-phase five-wire power supply; the DC stabilized power supply can provide 24V and 5V power supply. The power switch is connected to a low-voltage circuit breaker. The detection instrument, touch screen, frequency converter, stepping motor driver, PLC unit and PLC expansion module are grounded.

Compared with the prior art, the beneficial effects of the present invention are: the PLC experimental device reduces the experimental cost, is convenient to operate, the design of the experimental device is reasonable, and the stability and safety performance are improved. The device is composed of a detection instrument, a touch screen, a stepper motor driver, a power supply module, an input unit, an output unit, a PLC unit and a PLC expansion module, and provides basic experimental instruments for experiments on PLC. The output unit includes a frequency converter and an indicator light, and the frequency converter can change the frequency and amplitude of the working voltage of the AC motor. The frequency converter replaces the traditional DC motor to adjust the speed of the stepper motor driver, reduces the size of the equipment, greatly reduces the maintenance rate, and improves the stability of the experiment. The output unit can be connected with peripheral equipment, which provides a variety of experimental types. The experimental device is placed in the box, has small volume and is convenient to carry, and can provide basic experimental devices for various experiments. The touch screen is installed in the first area of the box, and the frequency converter, stepper motor driver, detection instrument, power module, input unit, output unit, PLC unit and PLC expansion module are installed in the first area of the box. Second area. The first area is the observer's side, and the second area is the opposite side of the first area. The installation position of the touch screen is reasonable, consistent with the view angle of the observer, and at the same time, it is convenient for demonstration operation, and the control screen has the functions of monitoring alarm and data storage and processing, which increases the functionality of the overall device and provides convenience for comprehensive experiments. The PLC expansion module is connected to the slot of the PLC unit through a cable; the PLC unit and the PLC expansion module are installed on the guide rail, so that the PLC unit and the expansion module can be moved and fixed at any time according to the required position of the experiment. The PLC expansion module can be disassembled and replaced, and an appropriate PLC expansion module can be selected according to the experimental requirements. The guide rail is fixed in the middle of the second area; the stepper motor and the stepper motor driver are fixed on one side of the guide rail; the frequency converter is fixed on the other side of the guide rail; the guide rail , stepper motor, stepper motor driver and inverter fixed position is conducive to wiring, the length of the required wire or signal line is the shortest, and the wiring position should try to avoid the intersection of wires or signal lines, which not only saves costs, but also is the most reasonable in wiring . The detection instrument, touch screen, frequency converter, stepper motor driver, power supply module, input unit, output unit, PLC unit and PLC expansion module are selectively connected through wires or signal wires. The connection relationship of the experimental device is not single, which provides conditions for the diversity of experiments, and the experimental device can be connected through wires or signal lines according to the connection relationship required by the experiment. There is more than one detection instrument, which is used to detect voltage signal, current signal, power signal, frequency signal and power factor, and can read data in real time, which provides convenience for experiment monitoring and data reading. The setting of the touch screen and the detection instrument reduces the use of peripheral equipment, provides convenience for the experimental operation, reduces the experimental cost, and improves the experimental efficiency. The setting of AC power supply and DC power supply provides a choice of power supply for different experiments, and the power supply setting is reasonable. The AC power supply adopts a three-phase five-wire system. The power switch is connected to a low-voltage circuit breaker. The material of the experiment box is wood. The detection instrument, touch screen, frequency converter, stepper motor driver, PLC unit and expansion module are all grounded to ensure the safety of the experiment.

Description of drawings

Fig. 1 is the structural representation of embodiment one of the present invention

Fig. 2 is the structural representation of embodiment two of the present invention

Fig. 3 is the structural representation of embodiment three of the present invention

Fig. 4 is a schematic structural view of Embodiment 4 of the present invention

Detailed ways

Embodiment 1 As shown in Figure 1, a kind of PLC experimental device is made up of detection instrument, stepper motor, stepper motor driver, power supply module, input unit, output unit, PLC unit and PLC expansion module, provides for the experiment about PLC basic experimental equipment. The output unit includes a frequency converter and an indicator light. Inverter adjustable speed drive system, through variable frequency drive technology to change the frequency and amplitude of the working voltage of the stepper motor driver, smoothly control the speed and torque of the AC motor. The frequency converter replaces the traditional DC motor to adjust the speed of the stepper motor driver, reduces the size of the equipment, greatly reduces the maintenance rate, and improves the stability of the experiment.

The output unit can be connected with peripheral equipment, which provides a variety of experimental types. The input unit can be connected to the required power supply equipment.

The comprehensive experimental device is placed in the box, the experimental device is placed in the box, small in size and easy to carry, and can provide basic experimental devices for various experiments. There is more than one detection instrument, and different detection instruments can simultaneously monitor signals such as voltage signal, current signal, power signal, frequency signal and power factor. The data can be read in real time, which provides convenience for the monitoring of the experiment and the reading of the data.

The frequency converter, stepping motor, stepping motor driver, detection instrument, power module, input unit, output unit, PLC unit and PLC expansion module are installed in the second area of the box body. The experimental instruments are integrated in the second area, which makes the experimental operation more convenient. The PLC expansion module is connected to the slot of the PLC unit through a cable. The PLC unit and the PLC expansion module are installed on the guide rail, so that the PLC unit and the expansion module can be moved and fixed at any time according to the position required by the experiment. The PLC expansion module can be disassembled and replaced, and an appropriate PLC expansion module can be selected according to the experimental requirements. The guide rail is fixed in the middle of the second area; the stepper motor and the stepper motor driver are fixed on one side of the guide rail; the frequency converter is fixed on the other side of the guide rail; the guide rail , stepper motor, stepper motor driver and inverter fixed position is conducive to wiring, the length of the required wire or signal line is the shortest, the wiring position avoids crossing of wires or signal lines as far as possible, ensuring the accuracy of the experiment. Not only cost saving, but also the most reasonable in wiring. The detection instrument, frequency converter, stepping motor, stepping motor driver, power supply module, input unit, output unit, PLC unit and PLC expansion module are selectively connected through wires or signal wires. The connection relationship of the experimental device is not single, which provides conditions for the diversity of experiments, and the experimental device can be connected through wires or signal lines according to the connection relationship required by the experiment. Provide basic equipment for a variety of experiments, such as PLC basic training, PLC comprehensive training, inverter knowledge, operation, parameter setting and communication training, analog program analog module 2AD, 4DA use programming method Skills, PID operation, etc.

The PLC unit and the PLC expansion module can be of different models, providing operators with different choices. The power module includes an AC power supply, a DC stabilized power supply and a power switch. The DC stabilized power supply can provide 24V and 5V power. The power supply provides AC and DC, providing optional power for different experiments.

The AC power supply is a three-phase four-wire system power supply or a three-phase five-wire system power supply; the power switch is connected to a low-voltage circuit breaker; the material of the experiment box is wooden; the detection instrument, frequency converter, stepping motor, Stepper motor driver, PLC unit and expansion modules are grounded. The above not only guarantees the safety of the instrument and prevents leakage, but also ensures the safety of the operator.

The PLC experimental device provides different power sources for the experiment, and the PLC unit and the PLC expansion module can be of different models, providing operators with different choices. The output unit can be connected with peripheral equipment, which provides a variety of experimental types. The input unit can be connected to the required power supply equipment. The use of frequency converter reduces the size of the equipment, greatly reduces the maintenance rate, and improves the stability of the experiment. The three-phase five-wire power supply, low-voltage circuit breaker, and box materials are made of wood and testing instruments, frequency converters, stepper motors, stepper motor drivers, PLC units, and PLC expansion modules are grounded to ensure and improve the safety of the experiment. The detection instrument can read data in real time, which provides convenience for experiment monitoring and data reading. The use of frequency converter reduces the size of the equipment, greatly reduces the maintenance rate, and improves the stability of the experiment.

Embodiment two As shown in Figure 2, a kind of PLC experimental device, described device is made up of detection instrument, touch screen, stepper motor, stepper motor driver, power supply module, input unit, output unit, PLC unit and PLC extension module, Basic experimental instruments are provided for experiments on PLC. Inverter adjustable speed drive system, through variable frequency drive technology to change the frequency and amplitude of the working voltage of the stepper motor driver, smoothly control the speed and torque of the AC motor. The frequency converter replaces the traditional DC motor to adjust the speed of the stepper motor driver, reduces the size of the equipment, greatly reduces the maintenance rate, and improves the stability of the experiment.

The output unit can be connected with peripheral equipment, which provides a variety of experimental types. The input unit can be connected to the required power supply equipment.

The comprehensive experimental device is placed in the box, the experimental device is placed in the box, small in size and easy to carry, and can provide basic experimental devices for various experiments. The detection instrument is more than one, and different detection instruments can simultaneously monitor signals such as voltage signal, current signal, power signal, frequency signal and power factor, and can read data in real time, which provides convenience for experiment monitoring and data reading.

The touch screen is installed in the first area of the box, and the frequency converter, stepping motor, stepping motor driver, testing instrument, power supply module, input unit, output unit, PLC unit and PLC expansion module are installed in the The second area of the box. The first area is the observer's side, and the second area is the opposite side of the first area. The installation position of the touch screen is reasonable, consistent with the view angle of the observer, and at the same time, it is convenient for demonstration operation, and the control screen has the functions of monitoring alarm and data storage and processing, which increases the functionality of the overall device and provides convenience for comprehensive experiments. When the touch screen is connected with the testing instrument to form a closed loop at the same time, the touch screen can read the degree of the testing instrument at the same time, providing intuitive data for reading data. The setting of the touch screen and the detection instrument reduces the use of peripheral equipment, provides convenience for the experimental operation, reduces the experimental cost, and improves the experimental efficiency. The PLC expansion module is connected to the slot of the PLC unit through a cable. The PLC unit and the PLC expansion module are installed on the guide rail, so that the PLC unit and the expansion module can be moved and fixed at any time according to the position required by the experiment. The PLC expansion module can be disassembled and replaced, and an appropriate PLC expansion module can be selected according to the experimental requirements. The guide rail is fixed in the middle of the second area; the stepper motor and the stepper motor driver are fixed on one side of the guide rail; the frequency converter is fixed on the other side of the guide rail; the guide rail , stepper motor, stepper motor driver and inverter fixed position is conducive to wiring, the length of the required wire or signal line is the shortest, the wiring position avoids crossing of wires or signal lines as far as possible, ensuring the accuracy of the experiment. Not only cost saving, but also the most reasonable in wiring. The detection instrument, frequency converter, stepping motor, stepping motor driver, power supply module, input unit, output unit, PLC unit and PLC expansion module are selectively connected through wires or signal wires. The connection relationship of the experimental device is not single, which provides conditions for the diversity of the experiment, and the experimental device can be connected through wires or signal lines according to the connection relationship required for the experiment. Provide basic equipment for a variety of experiments, such as PLC basic training, PLC comprehensive training, inverter knowledge, operation, parameter setting and communication training, analog program analog module 2AD, 4DA use programming method Skills, PID calculation, stepping motor positioning control, understanding, operation and application training of controlling touch screen, etc.

The PLC unit and the PLC expansion module can be of different models, providing operators with different choices. The power module includes an AC power supply, a DC stabilized power supply and a power switch. The DC stabilized power supply can provide 24V and 5V power. The power supply provides AC and DC, providing optional power for different experiments.

The AC power supply is a three-phase four-wire system power supply or a three-phase five-wire system power supply; the power switch is connected to a low-voltage circuit breaker; the material of the experiment box is wooden; the detection instrument, frequency converter, stepping motor, Stepper motor driver, PLC unit and expansion modules are grounded. The above not only guarantees the safety of the instrument and prevents leakage, but also ensures the safety of the operator.

The PLC experimental device provides different power sources for the experiment, and the PLC unit and the PLC expansion module can be of different models, providing operators with different choices. The output unit can be connected with peripheral equipment, which provides a variety of experimental types. The input unit can be connected to the required power supply equipment. The use of frequency converter reduces the size of the equipment, greatly reduces the maintenance rate, and improves the stability of the experiment. The three-phase five-wire power supply, low-voltage circuit breaker, and box materials are made of wood and testing instruments, frequency converters, stepper motors, stepper motor drivers, PLC units, and PLC expansion modules are grounded to ensure and improve the safety of the experiment. The use of frequency converter reduces the size of the equipment and greatly reduces the maintenance rate. The device also includes a detection instrument, which can read data in real time, and provides convenience for experiment monitoring and data reading. The touch screen is set on the side of the observer, and the structure is set reasonably, which is convenient for intuitive demonstration operation. Moreover, the control panel has the functions of monitoring and alarming and data storage and processing, which increases the functionality of the overall device and provides convenience for comprehensive experiments. The PLC experiment device reduces the use of peripheral equipment, provides convenience for experiment operation, reduces experiment cost, and improves experiment efficiency.

Embodiment 3 As shown in Figure 3, the automatic production line installation and debugging system is installed and debugged through a PLC experimental device. The device is composed of a detection instrument, a touch screen, a stepping motor, a stepping motor driver, a power supply module, and an input unit , Output unit, PLC unit and PLC expansion module. The output unit includes a frequency converter and an indicator light. The experimental device is placed in a box, and the material of the box is wood. The touch screen is installed in the first area of the box, and the frequency converter, stepping motor, stepping motor driver, testing instrument, power supply module, input unit, output unit, PLC unit and PLC expansion module are installed in the The second area of the box. The first area is the observer's side, and the second area is the opposite side of the first area. The PLC expansion module is connected to the slot of the PLC unit through a cable, the PLC unit and the PLC expansion module are installed on the guide rail, the PLC expansion module is detachable and replaceable, and the guide rail is fixed on the second middle of the area. The stepping motor and the stepping motor driver are fixed on one side of the guide rail, and the frequency converter is fixed on the other side of the guide rail. The detection instrument, touch screen, frequency converter, stepping motor, stepping motor driver, power supply module, input unit, output unit, PLC unit and PLC expansion module are selectively connected through wires or signal wires. There is more than one detection instrument, which is used to detect voltage signal, current signal, power signal, frequency signal and power factor. The power module includes an AC power supply, a DC stabilized power supply and a power switch. The AC power supply is a three-phase four-wire power supply or a three-phase five-wire power supply; the DC stabilized power supply can provide 24V and 5V power supply. The power switch is connected to a low-voltage circuit breaker. The detection instrument, touch screen, frequency converter, stepping motor, stepping motor driver, PLC unit and PLC expansion module are grounded.

The automatic production line is connected with the automatic production line installation and commissioning system through the input module. The frequency converter, touch screen, and stepping motor are respectively connected to the PLC unit, the PLC unit is connected to the encoder, the PLC unit is connected to the PLC expansion module, and the PLC expansion module is connected to the A/D module . The stepping motor is connected with the stepping motor driver. The touch screen is connected to a power module, and the power module selects a DC power supply of 24V. A/D modules, encoders and stepping motors are small in size, so the automatic production line installation and debugging system can be installed in the experiment box, and the operation is convenient.

The automatic production line installation and debugging system used the input module, output module, touch screen, power module, PLC unit, PLC expansion module, stepper motor and stepper motor driver in the PLC experimental device, and connected A/ D module and encoder. The detection instrument is not used in the automatic production line installation and debugging system, then the detection instrument, touch screen, frequency converter, stepper motor, stepper motor driver, power supply module, input unit, output unit, PLC unit and PLC expansion module Selective connection via conductors or signal lines. The touch screen can replace the detection instrument to read current, voltage, frequency and other data.

The signal line is connected to an external PC through the communication port of the PLC unit, and the program is loaded. The function of the touch screen is to start/stop the operation and indicate the working status, read out the current, voltage, frequency and other settings of the inverter, display the accumulated data of the workpiece in each slot on the touch screen, and clear the data. The frequency converter can change the frequency of the voltage to adjust the speed of the stepping motor, and the A/D module converts the analog quantity into a digital quantity and displays it on the touch screen. The power module provides power for the touch screen. The stepping motor can control the precise positioning of the grasping manipulator, and place the workpiece accurately at the designated position. The encoder feeds back the rotation angle of the stepper motor to the stepper driver, and when the stepper driver receives the feedback signal, it controls the rotation of the stepper motor; thereby forming a closed-loop control to precisely control the rotation position of the stepper motor.

Embodiment 4 As shown in Figure 4, the electric energy monitoring system of the motor in the workshop is installed and debugged through a PLC experimental device. The device is composed of a detection instrument, a touch screen, a stepper motor, a stepper motor driver, a power module, an input unit, It is composed of output unit, PLC unit and PLC expansion module. The output unit includes a frequency converter and an indicator light. The experimental device is placed in a box, and the material of the box is wood. The touch screen is installed in the first area of the box, and the frequency converter, stepping motor, stepping motor driver, testing instrument, power supply module, input unit, output unit, PLC unit and PLC expansion module are installed in the The second area of the box. The first area is the observer's side, and the second area is the opposite side of the first area. The PLC expansion module is connected to the slot of the PLC unit through a cable, the PLC unit and the PLC expansion module are installed on the guide rail, the PLC expansion module is detachable and replaceable, and the guide rail is fixed on the second middle of the area. The stepping motor and the stepping motor driver are fixed on one side of the guide rail, and the frequency converter is fixed on the other side of the guide rail. The detection instrument, touch screen, frequency converter, stepping motor, stepping motor driver, power supply module, input unit, output unit, PLC unit and PLC expansion module are selectively connected through wires or signal wires. There is more than one detection instrument, which is used to detect voltage signal, current signal, power signal, frequency signal and power factor. The power module includes an AC power supply, a DC stabilized power supply and a power switch. The AC power supply is a three-phase four-wire power supply or a three-phase five-wire power supply; the DC stabilized power supply can provide 24V and 5V power supply. The power switch is connected to a low-voltage circuit breaker. The detection instrument, touch screen, frequency converter, stepping motor, stepping motor driver, PLC unit and PLC expansion module are grounded.

The workshop motor is connected with the workshop motor power monitoring system through the input module. The detection instrument is connected with the PLC unit through the 485 bus, and more than one detection instrument can be connected. The touch screen is connected with the PLC unit, the power module is connected with the touch screen, and the power module is a 24V DC power supply. The PLC unit is externally connected with a contactor through a wire, and the PLC unit is connected with a PC through a modbus bus. The electric energy monitoring system of the motor in the workshop can be installed in the experiment box, which is easy to operate.

The workshop electric energy monitoring system uses the input module, output module, detection instrument, touch screen, power module, PLC unit in the PLC experimental device, and is connected with the encoder at the same time. In the automatic production line installation and debugging system, no stepper motor, stepper motor driver and PLC expansion module are used, then the detection instrument, touch screen, frequency converter, stepper motor, stepper motor driver, power module, input unit , output unit, PLC unit and PLC expansion module are selectively connected through wires or signal wires.

The Modbus bus is connected to an external PC through the communication port of the PLC unit, and the program is loaded. The function of the touch screen can start/stop the operation and indicate the working status to control the working status of the motor. Read the current, voltage, power, total power, active power, reactive power, power factor of each phase from the instrument through the touch screen screen, and also display various parameters of each time period through setting. The power module provides power supply voltage for the touch screen.

The foregoing description shows and describes preferred embodiments of the present invention, and as previously stated, it is to be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments but may be applied to various other embodiments. Combinations, modifications and circumstances, and can be modified within the scope of the inventive concept described herein, by the above teachings or by skill or knowledge in the relevant field. However, changes and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all be within the protection scope of the appended claims of the present invention.

Claims (9)

1. a PLC experimental provision, is characterized in that: described experimental provision is comprised of measuring instrument, touch-screen, stepper motor, stepper motor driver, power module, input block, output unit, PLC unit and PLC expansion module; Described output unit comprises frequency converter and pilot lamp; Described experimental provision is positioned in casing; Described touch-screen is arranged on the first area of described casing, and described frequency converter, stepper motor, stepper motor driver, measuring instrument, power module, input block, output unit, PLC unit and PLC expansion module are arranged on the second area of described casing; Described PLC expansion module is connected with the slot of described PLC unit by cable; Described PLC unit and described PLC expansion module are arranged on guide rail; Described PLC expansion module detachable replacement; Described guide rail is fixed on the centre position of described second area; Described stepper motor and described stepper motor driver are fixed on described guide rail one side; Described frequency converter is fixed on described guide rail opposite side; Described measuring instrument, touch-screen, frequency converter, stepper motor, stepper motor driver, power module, input block, output unit, PLC unit and PLC expansion module are by the connection of wire or signal-line choosing.

2. PLC experimental provision according to claim 1, is characterized in that: described measuring instrument is more than one.

3. PLC experimental provision according to claim 2, is characterized in that: described measuring instrument is for detection of voltage signal, current signal, power signal, frequency signal and power factor.

4. PLC experimental provision according to claim 1, is characterized in that: the side that described first area is observer, the offside that described second area is first area.

5. PLC experimental provision according to claim 1, is characterized in that: described power module comprises AC power, D.C. regulated power supply and power switch.

6. PLC experimental provision according to claim 5, is characterized in that: described AC power is three-phase four-wire system power supply or three-phase five-wire mode power supply; Described D.C. regulated power supply can provide 24V and 5V power supply.

7. PLC experimental provision according to claim 1, is characterized in that: described power switch connects low-voltage circuit breaker.

8. PLC experimental provision according to claim 1, is characterized in that: the material of described casing is wooden.

9. PLC experimental provision according to claim 1, is characterized in that: described measuring instrument, touch-screen, frequency converter, stepper motor, stepper motor driver, PLC unit and PLC expansion module ground connection.