KR200341577Y1 - Education device for programmable logic controller through network - Google Patents

Abstract

The present invention relates to an educational device of a programmable logic controller (hereinafter referred to as a PLC), and more particularly, to an educational device that allows a plurality of students to simultaneously create and practice a PLC program on a single PLC connected to a network.

The PLC teaching apparatus of the present invention includes a network interface unit for data communication with a PLC, a program input unit for creating a program to be executed in the PLC, and a data memory of the PLC to be used to create a program in the program input unit. A memory mapping unit for selecting a range of the output / output data memory and allocating an input / output internal memory corresponding to the selected input / output data memory, and receiving the value of the selected output data memory of the PLC through the network interface unit. And a signal processor for reading the value in the input internal memory and transmitting it to a network interface unit for writing to the selected output data memory of the PLC, and the value of the internal memory corresponding to the selected virtual input / output device. Read from the program input section Thus the logic of the programs include simulation unit for outputting the operating status of the output device to the monitor.

Description

Programmable logic controller educational device over network {EDUCATION DEVICE FOR PROGRAMMABLE LOGIC CONTROLLER THROUGH NETWORK}

The present invention relates to a training device of a programmable logic controller (PROGRAMMABLE LOGIC CONTROLLER, hereinafter referred to as PLC). It relates to the educational device.

PLCs are widely used in industrial and process control as programmable logic controllers. As shown in Fig. 1, the PLC 20 generally includes a central processing unit 21 (hereinafter referred to as a 'CPU'), a program memory 22 and a data memory 23, an input unit 24 and an output unit. And a power supply unit 26. The PLC program input device 10 is a device for creating a program in a PLC-specific program language such as a ladder program and inputting it into the program memory 22, or by creating a PLC control program in a general-purpose user computer for RS232C communication. The port can also be downloaded to the PLC. The input device 27 is a device that outputs a signal such as a switch or various sensors, and is connected to the input terminal 24 of the PLC, and the output device 28 is driven by a PLC output such as a lamp or a solenoid valve. Is connected to the output 25 terminal of the PLC.

The CPU 21 of the PLC sequentially executes the programs stored in the program memory 22, periodically reads input values of the input devices 27 through the input unit 24, and records them in the corresponding data memory 23. The value recorded in the data memory 23 corresponding to the output device 28 is read and output to the output device 28 through the output unit 25. In other words, program execution and I / O scanning is performed repeatedly.

In order to educate a user to program a PLC that operates as described above, as illustrated in FIG. 1, a set of educational equipment (a program input device, a PLC, and an input / output device connected to the PLC) is required. In particular, if there are a large number of trainees, the number of trainees must be provided with a large number of trainees, so it is expensive to purchase the equipment. There is a problem that this is lowered.

In addition, when it is necessary to replace the input and output equipment connected thereto according to the change of the program contents, there is a hassle of having to replace the wiring of the input and output devices connected to the input and output units one by one.

The present invention is to improve the above problems, and has an object to provide a PLC training apparatus that can have a single PLC, a plurality of users can create a program and practice at the same time.

In addition, an object of the present invention is to provide a PLC training apparatus that can simulate the input and output device virtually without changing the wiring of the input and output equipment even if the program to be changed.

1 is a schematic block diagram of a general PLC

2 is a system configuration diagram of the PLC training apparatus according to the present invention

3 is an internal configuration diagram of a user computer of the PLC training apparatus according to the present invention

4 is a schematic operation flowchart of the PLC training apparatus of the present invention

5A is a conceptual diagram of a data memory of a PLC

5B is a conceptual diagram showing a state in which the data memory of the PLC is allocated to the internal memory of the user computer;

6 is a schematic diagram of a virtual input / output device

7 is an exemplary diagram of a PLC program for controlling the virtual input / output device shown in FIG.

<Description of Drawing>

10 PLC program input device 20 PLC

21 CPU 22 Program Memory

23 Data Memory 24 Input Section

25 Outputs 30 User Computer

31 Network interface part 32 Signal processing part

33 PLC program section 34 I / O mapping section

35 Simulation Unit 40 PLC Rack

50 CPU Module 60 Network Interface Module

70 Input Module 80 Output Module

The PLC teaching apparatus of the present invention for achieving the above object is a PLC teaching apparatus having a PLC connected to a network and a plurality of user computers for transmitting a program created connected to the network to the PLC. A network interface unit for data communication with the PLC, a program input unit for creating a program to be executed in the PLC and transmitting the program to the PLC through the interface unit, and a data memory of the PLC to be used for program creation at the program input unit. Selects the range of input / output data memory, assigns the input / output internal memory corresponding to the selected input / output data memory, selects the virtual input / output device, and inputs / outputs corresponding to the selected input / output device. Allocate the internal memory to store a signal, and assign A memory mapping unit for setting an initial value of an input / output device in a predetermined memory, a value of a selected output data memory of the PLC is transmitted through the network interface unit, and recorded in a corresponding internal memory, and the value is written in the input internal memory. A signal processing unit which reads and transmits to a network interface unit to write to the selected output data memory of the PLC, and reads a value of an internal memory corresponding to the selected virtual input / output device, according to the logic of a program created in the program input unit. It characterized in that it comprises a simulation unit for recording the input value of the input device generated during the operation of the output device to the input internal memory, and outputs the operating state of the output device to the monitor.

In the PLC teaching apparatus of the present invention, it is preferable that the network uses an Ethernet communication protocol, and the range of the data memory of the PLC to be used in the training program can be fixed for each user computer. .

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the PLC training apparatus according to the present invention.

2 is a system configuration diagram of the PLC teaching apparatus according to the present invention, Figure 3 is an internal configuration diagram of a user PC of the PLC teaching apparatus according to the present invention.

As shown in FIG. 2, the PLC teaching apparatus of this embodiment includes a network 90, a plurality of user computers 30 connected to the network 90, and a PLC connected to the network. The PLC is a rack type and is composed of a network interface module 60 for data communication with the CPU module 50 and other devices connected to the network, and various input modules 70 and output modules 80. In the present embodiment, the network preferably uses an Ethernet communication protocol, but is not limited thereto.

The input / output module of the PLC may be connected to an input device such as a switch or a sensor, or an output device such as a lamp or a solenoid valve to a terminal. However, in the present invention, the power and the output device are virtually selected to operate graphically on a user computer. You don't have to connect the input and output devices because you can simulate doing so.

As shown in FIG. 3, the user computer 30 is connected to a network through a network interface unit 31. The network interface unit 31 communicates with the PLC 40 via the network 90. That is, the program creation unit 33 receives the PLC program created by the user and transmits the program to the PLC and receives the program stored in the program memory 22 of the PLC and provides the program to the program creation unit 33 or the data memory 23 of the PLC. Receive data saved in PLC) or transfer data value stored in internal memory of user computer to PLC and save it in data memory.

The program input unit 33 creates a program that the user wants to perform in the PLC and transmits the program to the PLC through the network interface unit 31. In addition, the program stored in the program memory of the PLC can be received and modified to be stored in the internal memory of the user computer or transmitted to the PLC through the network interface unit. The program input unit 33 supports, but is not limited to, a ladder program (LADDER PROGRAM), which is a language of a PLC program.

The memory mapping unit 34 selects a range of the input / output data memory of the data memory 23 of the PLC to be used when creating the PLC program in the program input unit 33 (see FIG. 5A), and selects the selected input / output data memory. Allocate the input / output internal memory corresponding to (see Fig. 5b). In addition, the memory mapping unit 34 allocates the internal memory for storing an input / output signal corresponding to the selected virtual input / output device, and sets an initial value of the input / output device in the allocated internal memory. do.

The signal processing unit 32 receives the value of the output data memory of the PLC through the network interface unit 31 at regular time intervals, records it in the corresponding internal memory, reads the value in the input internal memory, and inputs the PLC. The data is transferred to the PLC through the network interface unit 31 so as to be recorded in the data memory.

The simulation unit 35 selects a virtual input / output device, reads a value of an internal memory corresponding to the selected virtual input / output device, and according to the logic of the program created by the program input unit 33, the virtual output device. The input value of the input device generated at the time of operation is recorded in the input internal memory, and the operation state of the output device is output to a display device such as a monitor (not shown).

The memory mapping unit 34, the signal processing unit 32, and the simulation unit 35 independently of each other in the user computer through the internal memory inside the user computer, not shown, allocated by the memory mapping unit 34. Is performed in

Hereinafter, the operation relationship of the PLC training apparatus according to the present invention will be described with reference to the drawings of FIGS. 4 to 6.

Referring to FIG. 4, first, a virtual input and output device is selected (S10). As shown in FIG. 6 as a virtual input / output device in this embodiment, one double acting cylinder 3 and a reverse reed switch 1 and a forward lead switch 2 provided at the front end of the cylinder are connected to the cylinder and the solenoid valve connected to the cylinder. Select (4).

Next, the range of the input / output data memory of the PLC is selected (S20). In this embodiment, as shown in Fig. 5A, the input data memory is selected from M001 to M100, and the output data memory is selected from M101 to M200.

Next, an internal memory for storing the input / output data values of the selected virtual input / output device and a data memory of the corresponding PLC are allocated, and memory mapping for setting initial data is performed (S30). As an example of memory allocation, as shown in Fig. 5B, the internal memory addresses 0001 to 0100 of the user computer correspond to the input data memories M001 to M100, and the internal memory addresses 0101 to 0200 correspond to the output data memories M101 to M200. do. In addition, the initial data value is set to the initial state shown in Fig. 6, that is, M001 = 1, M002 = 0, M101 = 0.

Next, a PLC control program for the virtual selected input / output device is created and transferred to the program memory of the PLC (S40). In this embodiment, a ladder program as shown in FIG. 7 is created, transmitted to the PLC, and executed. The program shown in FIG. 7 maintains the output for operating the solenoid 4 in the state where the input M001 = 1 of the reverse lead number position 1 and the forward lead switch 2 input M002 = 0 (i.e., at M101). Self-holding), when the cylinder is fully advanced and the M002 = 1 signal is input from the forward lead switch 2, the solenoid operation output is stopped to allow the cylinder to reverse. The cylinder therefore repeats forward and backward.

Next, the input / output memory is updated (S50). That is, periodically reading the value of PLC output data memory (output data memory M101 to M200) and writing it to internal memory (internal memory addresses 0101 to 0201), and writing the value of input internal memory (internal memory addresses 0001 to 0100). Read the value and write it to the PLC's input data memory (input data memory M001 to M100).

Next, a simulation is performed (S70). In the simulation, the input and output values recorded in the internal memory are read, and the input values of the sensors are appropriately recorded in consideration of the logic of the program and the characteristics of the input / output device shown in FIG. That is, when M101 = 1 of the output internal memory, the value of the internal memory 0002 = 1 corresponding to the forward lead switch 2 is recorded, reflecting the proper time required for the cylinder to advance. If the PLC program does not end (S70), the input output memory is updated, and the PLC control program is executed so that Y1 = 0. Thus, the cylinder will continue to move forward and backward until the end of the program. In addition, the virtual input / output device may be graphically displayed in a simulation process, and the operating relationship may be graphically displayed by reading the values of the internal memory.

According to the present invention, with a single PLC, a plurality of users can set up a virtual input / output device and check the operation state of the program on the graphic screen while simultaneously creating and practicing the program.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention as long as it will be apparent to those skilled in the art.

Claims (3)

A PLC educational apparatus having a PLC connected to a network and a plurality of user computers for transmitting a program created connected to the network to the PLC, The user computer includes a network interface unit for data communication with the PLC, A program input unit for creating a program to be executed in the PLC and transmitting the program to the PLC through the interface unit; In the program input unit, a range of input / output data memories is selected from the data memory of the PLC to be used for programming, an input / output internal memory corresponding to the selected input / output data memory is allocated, and a virtual input / output device is selected. A memory mapping unit for selecting, allocating the internal memory for storing an input / output signal corresponding to the selected input / output device, and setting an initial value of the input / output device in the allocated memory; A signal processing unit for receiving the value of the selected output data memory of the PLC received through the network interface unit and writing it to the corresponding internal memory, and reading the value in the input internal memory and sending it to the network interface unit to write to the selected input data memory of the PLC Wow, Read the value of the internal memory corresponding to the selected virtual input / output device, and record the input value of the input device generated when the virtual output device is operated in accordance with the logic of the program created by the program input unit in the input internal memory; Programmable logic controller training apparatus via a network, comprising a simulation unit for outputting an operating state of an output device to a monitor. The method of claim 1, The network is a programmable logic controller training device through a network, characterized in that the network using the Ethernet communication protocol. The method according to claim 1 or 2, And a range of the data memory is fixed for each user computer.