KR100715915B1 - Synchronization method of data memory using shared memory between PI device and HM device - Google Patents

Abstract

The present invention provides a data memory synchronization method using a shared memory between a PLC device and the HMI device to improve the data processing speed and efficiency by synchronizing the data in the data storage area of the PLC device with the HMI device through a shared memory. There is a purpose.

A data memory synchronization method using a shared memory between a PLC device and an HMI device according to the present invention includes: generating a shared memory according to a type of the PLC device and connecting communication between the PLC device and the HMI device; Reading data from an address of a PLC device designated by an object of the HMI device and storing the data in a shared memory; And when there is an object access request through the user interface module, displaying corresponding data corresponding to the address where the data is read using a pointer of the shared memory.

PLC device, HMI device, shared memory, data synchronization

Description

Method for synchronizing data-memory using shared memory in PLC and HMI}

1 is a block diagram showing the structure of a PLC device and HMI equipment according to the present invention,

2 is a view illustrating a shared memory between HMI devices synchronized with a memory of a PLC device according to the present invention;

3 is a flowchart illustrating a data memory synchronization method between a PLC and an HMI device using a shared memory according to the present invention;

4 is a flowchart illustrating a communication connection step according to the present invention;

5 is a flow chart for explaining the step of storing and displaying the memory according to the present invention.

* Explanation of symbols for main parts of drawings *

10: PLC device 11: Central processing unit

12: I / O interface 13: memory

14: communication processor 20: HMI device

21: operating system 22: central processing unit

23: memory 24: user interface module

25: communication module

The present invention relates to a method for sharing and processing memory data between devices, and more particularly, to share a data memory of a PLC device with a memory of an HMI device, and to synchronize an object with a HMI device through a shared memory. The present invention relates to a data memory synchronization method using a shared memory between a PLC device and an HMI device to display data of a corresponding address with respect to shared data by using an address.

With the advancement and intelligence of the communication network, the operation management method and concept of the communication network are changing from the concept of operation management of the unit facilities to the concept of network management, service management, and business management.However, the current communication network is provided by a number of suppliers. Because it is composed of various communication facilities, equipment and systems having different characteristics from each other, efficient operation, maintenance and management is one of the difficult problems. This is because the operating system (OS) or network component that manages the network tends to use a specific information model and interface for each supplier, so it is easy to integrate and manage the entire network while maintaining interoperability. Because it does not. Therefore, diverse and heterogeneous communication network components coexist, and the appearance of various types of operating systems is inadequate to interoperability between operating systems, and the operational efficiency of the entire operating system is expected to decrease. It is necessary to proactively cope with the rising network operation and service environment.

In general, a PLC (Programmable Logic Controller) device is a sequence control device that performs a function similar to a computer with an input, an output, a memory, and an operation control unit.

The PLC device is a device used in industrial control tasks, and is used in many fields because it has high reliability, simple control software, ease of maintenance, and low price, and its applications are large, medium, and small. It is used for factory automation, monitoring and control of oil pipeline gas pipe, and various sequence control.

The PLC device is linked with the HMI (Human Machine Interface) device, which in turn transfers the command and address to the PLC device in order to obtain the data value of the object to be expressed from the PLC. The PLC device analyzes the received command, frames the data, and sends it back to the HMI device. The HMI device analyzes the returned response data and expresses its own object. If there are multiple objects to be expressed, commands are sent sequentially and responses are received sequentially. As the number of objects increases, this method causes a delay in receiving data, which has the disadvantage of slowing down the object update rate of the HMI device.

The present invention is to solve the above problems, in particular, the shared memory between the PLC device and the HMI device to improve the data processing speed and efficiency by synchronizing the data of the data storage area of the PLC device with the HMI device through the shared memory It is an object of the present invention to provide a data memory synchronization method.

Data memory synchronization method using a shared memory between the PLC device and the HMI device of the present invention for achieving the above object is the step of generating a shared memory according to the type of the PLC device, and connecting the communication between the PLC device and the HMI device ; Reading data from an address of a PLC device designated by an object of the HMI device and storing the data in a shared memory; And when there is an object access request through the user interface module, displaying corresponding data corresponding to the address where the data is read using a pointer of the shared memory.

In the communication connection step according to the present invention, the PLC device and HMI in the communication module of the HMI device to check the type of the PLC device for each company product, create a common memory map corresponding to the HMI device and register the shared memory; After checking the connection method between the equipment, try to connect according to each connection method, and if the communication connection is read the data from the address of the PLC; it is preferable to configure.

The storing of the data in the shared memory according to the present invention may include: identifying and transmitting an address in which the data exists in the PLC device from the object of the HMI device and generating and transmitting a read command for receiving the data; Transmitting data corresponding to the command from the PLC device to the HMI device and analyzing data transmitted from the PLC device from the HMI device; And repeating the storing of the received data in the shared memory using the pointer of the shared memory for converting the address system of the PLC device into the shared memory address system.

According to this method, the present invention is to match the data memory of the PLC device with the memory in the HMI device, and to receive and process the entire data memory of the PLC device divided into the maximum size that can be transmitted at once when the data request from the HMI device. Also, the interface module shown to the actual user continuously accesses the memory and reads and expresses the data of the corresponding address regardless of communication. By doing so, the present invention can minimize the number of data transmissions and also minimize the delay time between data transmissions.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the structure of a PLC device and an HMI device according to the present invention. Referring to the drawings, reference numeral 10 denotes a PLC device, and reference numeral 20 denotes an HMI device.

The PLC device 10 includes a central processing unit 11 that performs control and arithmetic operation, an input / output interface 12 that interfaces an input from an external input / output device, or an output from the central processing unit 11; In addition, a program for inputting a user's program and a memory 13 for storing and outputting input and output data according to a control signal from the central processing unit 11, the program input in the central processing unit 11 After storing the user program input through the device in the storage area of the memory 13 and storing the data input through the input and output interface 12 in the memory 13 and performing the operation for the control signal for controlling it Is output through the input / output interface 12. The central processing unit 11 includes a communication processor 14 for performing communication with the host device.

In addition, the HMI (Human Machine Interface) device 20 which communicates with the PLC device 10 to display an object stored in the PLC memory includes an operating system 21 for managing a communication network and a central processing unit 22 for controlling the system. , A memory 23 for storing data, a user interface module 24 for outputting various objects, and a communication module 25 for communicating with the PLC device 10.

In the present invention configured as described above, in synchronizing the data memory between the PLC and the HMI device using the shared memory, the user interface module of the HMI device 20 by downloading the data memory stored in the PLC device 10 to the HMI device 20 ( In (24), the address of the object can be displayed for the shared data using the address of the object.

2 is a view illustrating a shared memory between HMI devices synchronized with a memory of a PLC device according to the present invention.

Referring to the drawings, the memory 13 of the PLC device 10 includes a user memory 13a in which instructions necessary for use are stored, a system memory 13b for storing programmed codes, and a data memory for storing data generated during operation. The area is divided by 13c, and the data memory 13c is composed of read data 15, write data 16 and memory data 17.

In addition, in the data memory 13c of the PLC device 10, read data 15, write data 16, and memory data 17 are stored and classified. 20) received from the PLC device 10 through the communication module 25 and stored in the memory 23 so that the user interface module 24 can be displayed using the object address of the data.

3 is a flowchart illustrating a data memory synchronization method between a PLC and an HMI device using a shared memory according to the present invention.

Referring to the drawings, the present invention generates a shared memory according to the PLC device 10, and connecting the communication between the PLC device 10 and the HMI device 20 (S31); Reading data from the address of the PLC device 10 designated by the object of the HMI device 20 and storing the data in the shared memory (S32); The user interface module 24 uses the address of the object used to fetch and display data of the corresponding address from the shared memory (S33).

Hereinafter, the data memory synchronization method between the PLC and the HMI device using the shared memory according to the present invention will be described in detail for each step.

4 is a flowchart illustrating a communication connection step according to the present invention. Referring to the drawings, in general, the PLC device 10 needs to create a union and register it in the shared memory because all of the specifications are different for each company or product.

Therefore, the present invention checks the type of the PLC device for each company product to create a common memory map interface in the HMI device 20 and register the shared memory. For example, in case of the G company, the memory structure is composed of Read Data (128Byte), Write Data (128Byte), and Memory Data (8KByte). Define and register in shared memory. When defining unions, they are written using various data types to facilitate memory access. After registering the shared memory, the user interface module 24 holds the pointer of the shared memory so that data can be read from the shared memory (S41).

Read Data (128Byte) // innate typedef union {char iodB [8ss8]; // Byte USHORT iddW [4224]; // Word long iodD [2112]; // Double Word} PlcMemMap; Write Data (128Byte) Memory Data (8KByte // create shared memory m_hMapping = CreateFileMapping ((HANDLE) INVALID_ HANDLE_VALUE, NULL, PAGE_READWIRTE, 0, sizeof (PlcData), _T ("PLCMemMap")); // get a pointer to shared memory m_pViewOf = MapViewOfFile (m_hMapping, FILE_MAP_REAL | FILE_MAP_WRITE, 0, 0, 0); m_PlcData = (PlcMemMap *) m_pViewOf;

After the above step S41, the HMI device 20 in the communication module 25 after confirming the connection method between the HMI device 20 and the PLC 10 device, for example, RS232C, modem, Ethernet, etc. The connection is attempted according to the connection method, and when the communication connection is established, data is read from the address of the PLC (S42-S43).

5 is a flowchart for explaining a step of storing PLC data in a shared memory according to the present invention. Referring to the drawings, when the communication is connected between the PLC device 10 and the HMI device 20, the shared memory after reading data from the address of the PLC device 10 designated by the object of the HMI device 20 Store in

That is, the present invention checks the address where the data exists in the PLC device 10 in the object of the HMI device 20, generates a read command for receiving the data therein, and transmits the read command (S51).

For example, create the address "IW0.0.0" of the PLC data location and the command "0500RSB06% IW0000204" to receive the data. When creating a command, it is desirable to minimize the data update rate of an object by using the method that can retrieve the data of all objects in the smallest number of times.

As in step S51, when the present invention transmits a command for data reception from the HMI device 20 to the PLC device 10, the data corresponding to the command from the PLC device 10 to the HMI device 20. The HMI device 20 analyzes the data transmitted from the PLC device 10 (S52-S53).

When the data of the PLC device 10 is received by the HMI device 20 through the step S53, the present invention converts the address system of the PLC device 10 into the address system of the shared memory (for example, the address of the PLC data location " IW0.0.0 ", the shared memory data location" iodW [0] "), and then stored in the shared memory using the pointer of the shared memory (S54).

When the above step S54 is completed, the present invention repeats the above process when there is another object to be received from the PLC device 10, and receives data from the PLC device 10 when another object does not exist. Complete (S55).

When the step S55 is completed, all data from the PLC device 10 is stored in the shared memory of the HMI device 20, and in this state, when there is an object access request by the user, the HMI device 20 is shared. The data corresponding to the address (for example, m_PlcData-> iodW [0]) from which the data is read is displayed by using the pointer of the memory (S56).

In the present invention disclosed by such a method, since the interface portion of the HMI device is operated separately from the communication, and the speed is determined by the microprocessor used, data update can be made more quickly.

As described above, the method of synchronizing memory through the shared memory according to the present invention is to match the data memory of the PLC device with the shared memory in the HMI device, and to transfer the entire data memory of the PLC at once when data is requested from the HMI device. By dividing, receiving and processing, data transmission frequency can be minimized and delay time between data transmission can be minimized.

Claims (3)

Generating a shared memory according to the type of PLC device and connecting communication between the PLC device and the HMI device; Reading data from an address of a PLC device designated by an object of the HMI device and storing the data in a shared memory; And When the object access request is made through the user interface module of the HMI device, using the shared memory between the PLC device and the HMI device, comprising displaying the corresponding data corresponding to the address from which the data is read using a pointer of the shared memory. How to synchronize data memory. The method of claim 1, wherein the communication connection step, Checking the types of PLC devices for each company's products, creating a common memory map interface on the HMI device, and registering shared memory.  After confirming the connection method between the PLC device and the HMI device in the communication module of the HMI device, attempting to connect according to each connection method, and read the data from the address of the PLC when the communication connection is made; Data memory synchronization method using shared memory between PLC device and HMI device. The method of claim 1, wherein storing data in the shared memory comprises: Confirming an address in which the data exists in the PLC device in the object of the HMI device and generating and transmitting a read command for receiving the data; Transmitting data corresponding to the command from the PLC device to the HMI device, and analyzing the data transmitted from the PLC device from the HMI device; And PLC device and HMI device comprising the step of storing in the shared memory using a pointer of the shared memory for converting the address system of the PLC device to the address system of the shared memory for the data received from the PLC device Method of synchronizing data memory using shared memory.

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