CN107357272A - A kind of DCS mobile remote monitoring systems and method based on OPC UA - Google Patents

Abstract

The invention discloses a DCS mobile remote monitoring system and method based on OPC-UA. The system includes a host computer, a server and a DCS control system. The host computer is mobile configuration software developed on the Android platform based on the OPC UA specification. The server is an OPC server developed based on the OPC UA specification; the upper computer and the server are wirelessly connected through the factory's WIFI LAN, and communicate through the OPC UA protocol; the server and the DCS control system are connected through a wired connection, and communicate according to the driver. The present invention allows monitoring personnel to view field data anytime and anywhere, upgrades the traditional DCS monitoring system with low cost, safety and reliability, completes high-performance mobile remote monitoring, and changes the traditional industrial monitoring mode.

Description

A DCS mobile remote monitoring system and method based on OPC-UA

technical field

The invention relates to the technical field of industrial monitoring, in particular to an OPC-UA-based DCS mobile remote monitoring system.

Background technique

Distributed Control System (Distributed Control System, DCS) performs centralized control, monitoring, recording, and alarm operations on industrial field devices. In the past, in order to realize data communication between DCS and data acquisition of different production devices, it took a lot of time to develop dedicated Communication interface program, and the emergence of the OPC standard solves this problem. In the monitoring process, the traditional monitoring software mainly has the following problems: 1. The traditional DCS monitoring software generally runs on the PC terminal, and the on-site monitoring personnel need to be fixed in the monitoring room for viewing operations, and there is no way to liberate manpower. In addition, the maintenance and debugging of general industrial field equipment generally requires the use of walkie-talkies to communicate with relevant staff, which increases the inconvenience of maintenance and debugging. 2. Since the traditional OPC communication interface is based on Microsoft's COM and DCOM technology, there are the following problems in traditional OPC during remote access. The first point is that it is difficult to configure and has a long non-configurable timeout; the second point is that only Only the OPC client in the Windows operating system can communicate with the OPC server, and the platform independence is poor.

The birth of OPC-UA is to establish a real replacement for all existing COM-based specifications without any loss of function and performance, and to be able to describe the modeling capabilities of complex systems and platform-independent system interfaces. At present, the continuous upgrading of mobile devices, the improvement of hardware configuration and network transmission speed, and the continuous acceleration of the development of mobile monitoring software have greatly reduced the difficulty of solving the above problems. The market urgently needs a convenient, low-cost, safe and reliable mobile remote monitoring system.

Contents of the invention

The object of the present invention is to provide a DCS mobile remote monitoring system and method based on OPC-UA, which is convenient in maintenance, strong in flexibility, excellent in monitoring performance, safe and reliable.

In order to achieve the above object, the following technical solutions are adopted: the present invention mainly includes three parts of upper computer, server and DCS control system, the upper computer is mobile configuration software developed based on OPC-UA specification on the Android platform, and the server is An OPC server developed based on the OPC-UA specification; the host computer communicates with the server through the OPC-UA protocol, the DCS control system is an on-site industrial control system, and the server is connected to the DCS control system by wire.

Further, the host computer includes a search server module, a connection server module, an address space browsing module, a subscription module, a data display module, and a real-time dynamic curve drawing module; the server includes a connection verification module, an address space module, and a monitoring item module , Data acquisition module; the upper computer and the server are wirelessly connected through WIFI LAN, and the server and the DCS control system are connected through a wired connection.

A mobile remote monitoring method described in the present invention comprises the following steps:

Step 1, find the connection server, the search server module finds a valid server through WIFI, the connection server module selects the server to be connected, configures the information required for network connection, sends a connection request, and verifies on the server;

Step 2, browse the address space, pass an entry node to the server through the browse address space module in the host computer, and then return a node list, if there is no required node, you need to browse recursively;

Step 3, subscribe to the monitoring item. The monitoring item module in the server creates the monitoring item according to the selected node and sets the required attributes of the monitoring item. The subscription module in the host computer sets the subscription related attributes to create a subscription, and then adds the monitoring item to the subscription as the monitoring item When the data changes, it is pushed to the host computer through subscription;

Step 4. Display data and draw real-time dynamic curves. The data display module in the host computer draws industrial flow charts according to the industrial site, provides corresponding interactive events, and reflects data updates to the display interface in real time. Click the required equipment, and the curve display window pops up to display Data trends.

Further, in step 1, the search server inputs a registered server path for the search server in the host computer, searches for a list of servers contained in the current path, and displays part of the information on the interface for the user to select;

The described connection verification server comprises the following steps:

Step 1-1, the host computer selects the server to be connected, configures the access method, and sends a connection request to the connection verification module of the server;

Step 1-2, the connection verification module of the server performs verification according to the access mode of the upper computer, and if the verification passes, the connection is successful; otherwise, the connection fails, and the connection is re-established.

Further, in step 2, the described node is an important concept of forming an address space, which is derived from the base node and is used to describe the physical equipment on site, and the reference between nodes constitutes the address space of OPC-UA;

The address space is an abstract concept. In OPC-UA, the underlying control devices are abstracted into nodes in the address space, and the integrated address space is to map the underlying devices in the industrial site to the node set;

The browsing address space includes the following steps:

Step 2-1, browse the address space module to browse the address space module of the currently connected server;

Step 2-2, browse the address space module to select the entry node to browse in the server address space module, return a list of connected nodes for the current node, and build a tree hierarchy;

Step 2-3, the browse address space module enters from the root node of the constructed tree hierarchy, browses recursively in sequence, obtains information of each node in the server, and performs operations according to actual needs.

Further, in step 3, the subscribing to the monitoring item is a way of exchanging information between the server and the client, and in this way, data is periodically updated;

The subscription monitoring item includes the following steps:

Step 3-1, the subscription module creates a monitoring item according to the node information obtained by browsing the address space, and sets the attributes of the monitoring item, including monitoring mode, sampling interval, etc.;

Step 3-2, the subscription module creates a subscription, and defines the initial settings of the subscription, including the publication interval of the subscription, the lifespan, the maximum number of notifications for each notification message, etc.;

Step 3-3, the subscription module adds the monitoring item created above to the subscription, and when the monitoring item detects data changes, the subscription part pushes it to the host computer;

Step 3-4, the subscription module can edit or delete one or more monitoring items.

Further, in step 4, the display data described, drawing the real-time dynamic curve includes the following steps:

Step 4-1, the data display module in the host computer draws the industrial flow chart of the DCS control object, and provides necessary interactive click events in some places in the industrial flow chart;

Step 4-2, the data display module receives the data pushed by the subscription module, converts it into the data format required by the host computer, and displays it on the host computer according to the interface requirements;

Step 4-3, to interact with the host computer, the monitoring personnel need to click the click event of a certain device provided by the data display module to call out the real-time dynamic curve display module;

Step 4-4, the real-time dynamic curve display module first draws the plane Cartesian coordinate system with the data change time as the abscissa and the data value as the ordinate, and draws the converted numerical value in the data display module into the plane Cartesian coordinate system, Form a curve showing the trend of the data.

Compared with the prior art, the present invention has the following advantages: using OPC-UA technology and the upper computer to develop convenient monitoring software without performance loss; compatible with traditional industrial sites, seamlessly upgrading mobile remote monitoring, and reducing costs to the greatest extent ;The platform is placed in the field of mobile terminals, which is in line with the trend of computing mobility. This system is also very suitable for other industrial fields, and has very good development and application prospects.

Description of drawings

Fig. 1 is a system structure diagram of the present invention.

Fig. 2 is a system flow chart of the present invention.

Fig. 3 is a flow chart of browsing address space in the present invention.

Fig. 4 is a flow chart of subscribing to monitoring items in the present invention.

Reference numerals: 1-host computer, 2-server, 11-search server module, 12-connect server module, 13-browse address space module, 14-subscribe module, 15-data display module, 16-real-time dynamic curve module, 21-connection verification module, 22-address space module, 23-monitoring item module, 24-data acquisition module, 3-DCS control system.

detailed description

The present invention will be further described below in conjunction with accompanying drawing:

As shown in FIG. 1 , the system of the present invention includes: a host computer 1 and a server 2, and the host computer 1 is a mobile terminal on an Android platform, such as a mobile phone, a tablet, and the like. Server 2 is a server that provides field data, integrates address space, and subscribes to monitoring items.

The upper computer 1 includes a search server module 11, a connection server module 12, a browsing address space module 13, a subscription module 14, a data display module 15, and a real-time dynamic curve module 16; the search server module 11 is a search server module through WIFI under the factory local area network The connection server module 12 carries out connection verification according to the server-side configuration information; the browsing address space module 13 is used to browse the address space in the server 2, and finds key nodes; the subscription module 14 monitors the monitoring items added, and enables push; the data display module 15 will The data pushed by the subscription module 14 is converted into a format accepted by the host computer for display, and updated in real time according to changes in the pushed data; the real-time dynamic curve module is used to view the data change trend of a specific monitoring item.

Server 2 includes connection verification module 21, address space module 22, monitoring item module 23, data acquisition module 24, connection verification module 21 cooperates with connection server module 12, checks whether the configuration information matches, and verifies whether a secure connection can be established; address space module 22 Abstract the underlying devices into nodes, and map the real devices in the industrial site to the address space; the monitoring item module 23 cooperates with the subscription module 14, and adds the monitoring items generated according to the key nodes and some monitoring attributes to the subscription, when the monitored data When a change occurs, it is pushed to the upper computer; the data collection module 24 obtains the data collected by the DCS control system in the industrial site.

As shown in Figure 2, a mobile remote monitoring system includes the following steps:

The first step is to find the server. Both the host computer 1 and the server 2 are under the factory LAN, and the host computer 1 communicates with the server 2 through WIFI to obtain the information required for the host computer and the server to create a secure channel and session, including security settings, etc. , the search specification is defined in the OPC-UA specification, and the search server module 12 of the host computer 1 needs to input a registered server path. Through this path, it traverses the servers existing in the current network and returns a list of servers for the upper computer user to choose.

The second step is to connect to the verification server. According to the different security policies set by the server, the upper computer 1 connects to the server module 12 to configure relevant information to request connection. The specific steps are as follows:

(1) The connection server module 12 of the host computer 1 first determines different configuration options for establishing a connection with the server 2 .

(2) The connection server module 12 of the upper computer 1 sends a request to open the secure channel to the connection verification module 21 of the server 2, and the request can be selected whether to encrypt by the security mode, as shown in Figure 1 whether to perform a secure connection; both parties verify through Afterwards, a secure channel for exchanging special private information between the client and the server, that is, the upper computer 1 and the server 2, will be established. The secure channel has a life cycle and needs to be re-established after failure.

(3) Host computer 1 and server 2 create a session on a secure channel.

(4) Before the session in step (3) is used, the host computer 1 needs to send an activation session request to the server 2 to activate the session. When all verifications are successful, the connection between the host computer 1 and the server 2 is established, and the process data in the server 2 can be accessed by the host computer 1.

The third step is to browse the address space. The organizational structure of the address space in server 2 is similar to the file system in the Microsoft system. The nodes are organized together in this hierarchical structure. Each node represents a data entity, and a large number of nodes are connected to each other. A mesh structure. In the traditional OPC specification, address spaces are independent of each other. For example, there is an OPC-DA address space for storing data, and an OPC-A&E address space for processing alarm events. Client browsing is relatively cumbersome, and the address space module 22 in server 2 will be independent The address spaces are integrated into a unique address space. The upper computer 1 browses the address space module 13 to the address space module 22 of the server 2 and transmits an entry node, and then the address space module 22 returns a list of connected nodes, as shown in Figure 3, and its specific steps are as follows:

(1) Integrated address space, the address space module 22 in the server 2 maps real devices in the industrial site to a set of nodes. The address space module 22 abstracts the underlying equipment of the industrial site into a node. In the address space module 22, the nodes are linked together by way of reference and connected with each other to form a network structure.

(2) Start browsing, the browsing address module 13 in the host computer 1 uses the browsing service to browse the address space module 22 in the server 2, and the browsing service needs to accept an initial node, and then returns a list of nodes to the browsing address space module 13, and constructs Tree hierarchy, if there is no required node, continue to repeat this step.

(3) Select the required nodes, the browse address space module 13 in the host computer 1 obtains the information of each node in the address space module in the server 2 according to the browse operation of the previous step, and then selects the required nodes of the user according to actual needs to carry out follow-up operate.

The fourth step is to subscribe to the monitoring item. The real-time information exchange between the host computer 1 and the server 2 needs to use the subscription service. The subscription and the monitoring item together complete the push function. The monitoring item is created in the monitoring item module 23 in the server 2, and the subscription is made by the subscription module. 14 Created on the server 2, creating a monitoring item needs to use the required node browsed in the third step to browse the address space as the monitored node in the address space, and the monitoring item module 23 creates the monitoring item and adds it to the subscription. The subscription module 14 can add multiple monitoring items, modify or delete a certain monitoring item at the same time. When the data monitored by the monitoring item changes, it will be sent to the host computer 1 through the subscription service, as shown in Figure 4. The specific steps are as follows:

(1) create a monitoring item, the monitoring item module 23 in the server 2 first judges whether the monitoring item exists, if it exists, then directly enter the next step, and add it to the subscription; if it does not exist, then browse the address space according to the upper computer 1 Module 13 finds the required nodes, and sets the necessary configuration information of the monitoring items, including monitoring mode, sampling interval, etc. to create the required monitoring items.

(2) Create a subscription, the subscription module 14 in the host computer 1 creates a subscription, and defines the initial settings of the subscription, including the publication interval of the subscription, the period of use, the maximum number of notifications for each notification message, etc., the subscription module 14 can also be deleted Subscribe to the list.

(3) Add to subscription, subscription module 14 creates subscription and monitoring item module 23 creates monitoring item and then monitoring item is added to subscription to monitor the node in address space module 22; Subscription module 14 can add a plurality of monitoring items, revise certain Configuration parameters of one or more monitoring items, including sampling interval, etc., and one or more monitoring items can also be deleted.

(4) send a message, when the data monitored in the monitoring item module 23 changes or when an alarm event occurs, a notification will be generated and sent to the upper computer 1, and the time interval of sampling will be operated according to the time set when the monitoring item is created , the push interval will also be published according to the publish and subscribe time in the subscription.

The fifth step is to display data and draw real-time dynamic curves. The data display module 15 in the upper computer 1 draws the required industrial flow chart in the upper computer 1 according to the control object of the DCS control system, and is responsible for receiving the information received by the subscription module 14. The data is converted into the format required by the upper computer 1, and the data update is reflected to the corresponding specific equipment in the industrial flow chart, which is convenient for the on-site monitoring personnel to debug and maintain. The data display module 15 provides a click event for interaction with the user. On-site monitoring personnel can select the equipment concerned in the data display module 15 and click to pop up a dynamic curve display window. The dynamic curve window is drawn by the real-time dynamic curve module 16 . The real-time dynamic curve module 16 draws a plane Cartesian coordinate system window in the upper computer 1. According to the release time of the subscription module 14, the abscissa and the ordinate are accepted values, and the real-time change trend of the data is drawn in the plane Cartesian coordinate system. Specific steps are as follows:

(1) The data display module 15 in the upper computer 1 draws the industrial flowchart of the DCS control object, and also needs to provide necessary click events in some places in the industrial flowchart to facilitate user interaction, for example, to view the dynamic curve of a certain device, view Equipment introduction, etc.; the industrial flow chart should display the equipment flow of the industrial site in accordance with the relevant requirements, including equipment types, material directions, etc., on the host computer 1. During the drawing process, it is necessary to distinguish between static equipment and pipeline parts and dynamic value change update parts .

(2) The data display module 15 processes the received monitoring item data accordingly, including converting operations such as type conversion into the data required by the host computer, and then displays it on the interface drawn by the data display module 15 in (1) step, if For continuously changing data, repeat the data transformation in step (2) to update the data and update the interface.

(3) To interact with the host computer, the monitoring personnel need to click the click event of a certain device provided by the data display module 15 in step (1) to call out the real-time dynamic curve display module 16 .

The real-time dynamic curve display module 16 first draws the plane Cartesian coordinate system with the data change time as the abscissa and the numerical value of the data as the ordinate, and draws the converted numerical value in the data display module 15 into the plane Cartesian coordinate system to form a display The curve of the data trend.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. All such modifications and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (7)

1. A DCS mobile remote monitoring system based on OPC-UA, mainly comprising three parts of host computer, server, and DCS control system, characterized in that: said host computer is a mobile configuration based on OPC-UA specification development on the Android platform software, the server is an OPC server developed based on the OPC-UA specification; the upper computer communicates with the server through the OPC-UA protocol, the DCS control system is an on-site industrial control system, and the server and the DCS control system are wired. 2. A kind of DCS mobile remote monitoring system based on OPC-UA according to claim 1, is characterized in that: described upper computer comprises search server module, connect server module, browse address space module, subscription module, data display module, drawing a real-time dynamic curve module; the server includes a connection verification module, an address space module, a monitoring item module, and a data acquisition module; the upper computer and the server are connected wirelessly through a WIFI LAN, and the server and the DCS control system are connected through a cable. 3. A mobile remote monitoring method according to claim 1, characterized in that said method comprises the following steps: Step 1, find the connection server, the search server module finds a valid server through WIFI, the connection server module selects the server to be connected, configures the information required for network connection, sends a connection request, and verifies on the server; Step 2, browse the address space, pass an entry node to the server through the browse address space module in the host computer, and then return a node list, if there is no required node, you need to browse recursively; Step 3, subscribe to the monitoring item. The monitoring item module in the server creates the monitoring item according to the selected node and sets the required attributes of the monitoring item. The subscription module in the host computer sets the subscription related attributes to create a subscription, and then adds the monitoring item to the subscription as the monitoring item When the data changes, it is pushed to the host computer through subscription; Step 4. Display data and draw real-time dynamic curves. The data display module in the host computer draws industrial flow charts according to the industrial site, provides corresponding interactive events, and reflects data updates to the display interface in real time. Click the required equipment, and the curve display window pops up to display Data trends. 4. A kind of mobile remote monitoring method according to claim 3, is characterized in that: in step 1, described search server inputs a registered server path for the search server in the upper computer, and searches for the servers contained under the current path List, which displays some information on the interface for users to choose; The described connection verification server comprises the following steps: Step 1-1, the host computer selects the server to be connected, configures the access method, and sends a connection request to the connection verification module of the server; Step 1-2, the connection verification module of the server performs verification according to the access mode of the upper computer, and if the verification passes, the connection is successful; otherwise, the connection fails, and the connection is re-established. 5. A mobile remote monitoring method according to claim 3, characterized in that: in step 2, the described node is an important concept that constitutes the address space, derived from the base node, and used to describe the physical equipment on site , the references between nodes and nodes constitute the address space of OPC-UA; The address space is an abstract concept. In OPC-UA, the underlying control devices are abstracted into nodes in the address space, and the integrated address space is to map the underlying devices in the industrial site to the node set; The browsing address space includes the following steps: Step 2-1, browse the address space module to browse the address space module of the currently connected server; Step 2-2, browse the address space module to select the entry node to browse in the server address space module, return a list of connected nodes for the current node, and build a tree hierarchy; Step 2-3, the browse address space module enters from the root node of the constructed tree hierarchy, browses recursively in sequence, obtains information of each node in the server, and performs operations according to actual needs. 6. A mobile remote monitoring method according to claim 3, characterized in that: in step 3, the subscribing to the monitoring item is a way of exchanging information between the server and the client, and in this way periodic update data periodically; The subscription monitoring item includes the following steps: Step 3-1, the subscription module creates a monitoring item according to the node information obtained by browsing the address space, and sets the attributes of the monitoring item, including monitoring mode, sampling interval, etc.; Step 3-2, the subscription module creates a subscription, and defines the initial settings of the subscription, including the publication interval of the subscription, the lifespan, the maximum number of notifications for each notification message, etc.; Step 3-3, the subscription module adds the monitoring item created above to the subscription, and when the monitoring item detects data changes, the subscription part pushes it to the host computer; Step 3-4, the subscription module can edit or delete one or more monitoring items. 7. A kind of mobile remote monitoring method according to claim 3, is characterized in that: in step 4, described display data, drawing real-time dynamic curve comprises the following steps: Step 4-1, the data display module in the host computer draws the industrial flow chart of the DCS control object, and provides necessary interactive click events in some places in the industrial flow chart; Step 4-2, the data display module receives the data pushed by the subscription module, converts it into the data format required by the host computer, and displays it on the host computer according to the interface requirements; Step 4-3, to interact with the host computer, the monitoring personnel need to click the click event of a certain device provided by the data display module to call out the real-time dynamic curve display module; Step 4-4, the real-time dynamic curve display module first draws the plane Cartesian coordinate system with the data change time as the abscissa and the data value as the ordinate, and draws the converted numerical value in the data display module into the plane Cartesian coordinate system, Form a curve showing the trend of the data.