DCS communication system for different detection devices in power plant and application thereof

Abstract

The invention discloses a DCS communication system for different detection devices of a power plant and application thereof, the DCS communication system comprises a communication board, an industrial personal computer and communication configuration software, and functions of port conversion, communication protocol conversion, communication software, parameter configuration and the like are realized. Measurement data are collected in a centralized mode through different field data front ends, a bus communication mode is adopted, the measurement data are collected to the system, communication is conducted on the DCS in a unified mode, and integration of different communication protocols is completed. Software can conveniently carry out visual configuration on communication protocols and communication data, convenience and intuition are achieved, and the communication problem between the DCS and different detection devices is perfectly solved. By adopting the system, the construction cost of the DCS can be saved.

Description

Technical Field

[0001] The present invention relates to the field of DCS of power plants, and in particular to a DCS communication system for different detection equipment of power plants and its application. Background Art

[0002] Digital control system (DCS) is a common control system for power plants. At present, most of the measurement points in my country's DCS system are measured by the measurement point signal entering the DCS system through the DCS I / O board. The existing measurement equipment has many communication protocols and is difficult to configure, resulting in a complex system and high cost. Faced with a large number of non-main auxiliary measurement points and measurement points at long distances, the defects of the existing technology cannot meet the needs of these equipment measurement points. Therefore, it is urgent to develop a DCS communication system for different detection equipment in power plants, collect measurement data through different field data front ends, use bus communication methods, and collect them into the system, so as to communicate with the DCS in a unified manner, complete the integration of different communication protocols, and solve the above technical problems. Summary of the invention

[0003] The purpose of the present invention is to provide a data communication integration solution to save the cost of DCS construction in power plants in view of the fact that existing measuring equipment has multiple communication protocols and is difficult to configure.

[0004] To achieve the above-mentioned purpose, the present invention provides a DCS communication system for different detection equipment in a power plant, comprising: a communication board, connected to a plurality of on-site front-end data acquisition equipment and patrol equipment through ports; an industrial computer, connected to the communication board by a communication bus, the industrial computer being provided with a WinCcfg configuration software system; a DCS control system, connected to the industrial computer; wherein the WinCcfg configuration software system comprises a DCS configuration page, a patrol configuration page and a front-end configuration page, the module of the DCS configuration page is used to complete communication with the DCS control system, the patrol configuration page is used to complete the collection of on-site patrol data, and the front-end configuration page is used for front-end data collection; wherein the DCS control system adopts an FBM224 communication card, the port of the FBM224 communication card is connected to the industrial computer; the DCS control system sets the communication mode of the port through the port configuration interface of the FBM224 communication card.

[0005] According to an embodiment of the present application, the communication board adopts an 8-in-1 communication board, and the 8-in-1 communication board supports 8 RS232 ports.

[0006] According to an embodiment of the present application, the port of the 8-in-1 communication board supports RS232 / RS485 conversion, thereby increasing the communication distance.

[0007] According to an embodiment of the present application, the FBM224 communication card has 4 ports, each of which can be set as an RS-232, RS-422 or RS-485 communication link.

[0008] According to an embodiment of the present application, the DCS configuration page consists of 1 port connection module and 5 data modules. The port connection module is set to a slave communication type for receiving DCS control system commands. The 5 data modules are a steam turbine cylinder wall temperature data module, a bearing return oil temperature data module, a feed water pump shaft temperature data module, a steam drum wall temperature data module and a front end temperature data module.

[0009] According to the embodiment of the present application, the patrol configuration page is composed of 4 port connection modules and 4 data acquisition modules. In the patrol configuration page, the port connection module is set to "main communication" to send commands to the patrol equipment; the data acquisition module is used to send commands to the patrol equipment, receive and process data from the patrol equipment. The 4 port connection modules are the turbine cylinder wall temperature port connection module, the bearing return oil temperature port connection module, the feed water pump shaft temperature port connection module and the drum wall temperature port connection module; the 4 data acquisition modules are the turbine cylinder wall temperature data module, the bearing return oil temperature data module, the feed water pump shaft temperature data module and the drum wall temperature data module.

[0010] According to the embodiment of the present application, the front-end configuration page is composed of 1 front-end port connection module and 6 data modules. The front-end device adopts 485 communication, and the communication protocol is the ModeBus_RTU standard mode. The 6 data modules are A induced draft data module, B induced draft data module, A supply air data module, B supply air data module, A coal grinding data module, and B coal grinding data module.

[0011] Another aspect of the present application discloses an application of the DCS communication system for different detection equipment in a power plant as described above in the transformation of a DCS system of a power plant unit.

[0012] The beneficial effects of the technical solution of the present invention compared with the prior art are:

[0013] 1. The present invention collects measurement data centrally through different field data front ends, collects them to the industrial computer using bus communication, and uniformly communicates with the DCS control system. The DCS control system uses WinCcfg configuration software to realize port conversion and communication protocol conversion, and completes the integration of different communication protocols. The use of this application can save DCS construction costs.

[0014] 2. This application uses an 8-in-1 communication board that can support 8 RS232 ports. Through RS232 / RS485 conversion, it can support RS485 communication and increase the communication distance.

[0015] 3. The communication configuration software used in the present invention can facilitate visual configuration of communication protocols and communication data, which is convenient and intuitive, and perfectly solves the communication problem between DCS and different detection equipment in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural block diagram of a DCS communication system for different detection equipment in a power plant in an example of the present invention;

[0017] Figure 2 This is a schematic diagram of the main interface of the WinCcfg configuration software in the example of the present invention;

[0018] Figure 3 This is a schematic diagram of a pop-up window for selecting a module in WinCcfg configuration software in an example of the present invention;

[0019] Figure 4 It is a schematic diagram of a window of a setting module of WinCcfg configuration software in an example of the present invention;

[0020] Figure 5 A schematic diagram of a window showing the connection of the WinCcfg configuration software module setting mode in an example of the present invention;

[0021] Figure 6 This is a schematic diagram of an interface in which module connections in WinCcfg configuration software in an example of the present invention use automatic drawing of connection lines;

[0022] Figure 7 A schematic diagram of the FBM224 port configuration interface set for the F224 communication card in the example of the present invention;

[0023] Figure 8 It is a schematic diagram of the interface for setting FBM224 in the F224 communication card setting in the example of the present invention;

[0024] Fig. 9 This is a schematic diagram of the configuration interface in the F224 communication card settings in the example of the present invention;

[0025] Fig.10 It is a schematic diagram of the configuration interface of the slave device control module ECB201 in the DCS port setting and configuration in the example of the present invention;

[0026] Fig.11 It is a schematic diagram of the setting and effectiveness interface of the DCS port setting and configuration in the example of the present invention;

[0027] Fig.12 This is a schematic diagram of the device definition interface when clicking EQUIP CHG in the DCS port setting and configuration in the example of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0029] See also Figures 1 to 12 As shown, a DCS communication system for different detection equipment in a power plant is shown, the system includes an 8-in-1 communication board, an industrial computer, and communication configuration software, and supports functions such as port conversion, communication protocol conversion, communication software, and parameter configuration. Compared with the prior art, the DCS system generally has only one external communication interface, and it is difficult to achieve communication among all devices for multiple external devices with different communication protocols. The present application adopts a communication configuration software for visual configuration of communication protocols and communication data, which perfectly solves the communication problem between DCS and different detection equipment.

[0030] In this embodiment, the communication board is connected to a plurality of on-site front-end data acquisition devices and patrol devices through ports.

[0031] Furthermore, the communication board adopts an 8-in-1 communication board, and the 8-in-1 communication board supports 8 RS232 ports. At the same time, the port of the 8-in-1 communication board supports RS232 / RS485 conversion, thereby increasing the communication distance.

[0032] In this embodiment, the industrial computer uses a communication bus to connect the communication board. The industrial computer is provided with a WinCcfg configuration software system. The WinCcfg configuration software system includes a DCS configuration page, a patrol configuration page and a front-end configuration page. The module of the DCS configuration page is used to complete the communication with the DCS control system, the patrol configuration page is used to complete the collection of on-site patrol data, and the front-end configuration page is used for front-end data collection.

[0033] Furthermore, the DCS configuration page consists of 1 port connection module and 5 data modules. The port connection module is set to a slave communication type for receiving DCS control system commands. The 5 data modules are a turbine cylinder wall temperature data module, a bearing return oil temperature data module, a feed water pump shaft temperature data module, a drum wall temperature data module, and a front end temperature data module.

[0034] Furthermore, the patrol configuration page consists of 4 port connection modules and 4 data acquisition modules. In the patrol configuration page, the port connection module is set to "main communication" to send commands to the patrol equipment; the data acquisition module is used to send commands to the patrol equipment, receive and process data from the patrol equipment. The 4 port connection modules are the turbine cylinder wall temperature port connection module, the bearing return oil temperature port connection module, the feed water pump shaft temperature port connection module and the drum wall temperature port connection module; the 4 data acquisition modules are the turbine cylinder wall temperature data module, the bearing return oil temperature data module, the feed water pump shaft temperature data module and the drum wall temperature data module.

[0035] Furthermore, the front-end configuration page consists of a front-end port connection module and 6 data modules. The front-end device uses 485 communication, and the communication protocol is the ModeBus_RTU standard method. The 6 data modules are A induced draft data module, B induced draft data module, A supply air data module, B supply air data module, A coal grinding data module, and B coal grinding data module.

[0036] In this embodiment, the DCS control system is connected to the industrial computer; wherein, the DCS control system adopts the FBM224 communication card, and the port of the FBM224 communication card is connected to the industrial computer; the DCS control system sets the communication mode of the port through the port configuration interface of the FBM224 communication card.

[0037] Furthermore, the FBM224 communication card has 4 ports, each of which can be set as an RS-232, RS-422 or RS-485 communication link.

[0038] Another aspect of the present application discloses the application of the above DCS communication system for different detection equipment in a power plant in the transformation of a DCS system of a power plant unit.

[0039] Application of the present invention in the DCS system transformation of unit #22 in a power plant

[0040] WinCcfg configuration software consists of:

[0041] Main program: #22 unit DCS communication program.exe;

[0042] Main screen file: Screen.jpg;

[0043] ErrorMsg: error message file;

[0044] TaskKeyHook.dll: dynamic link library;

[0045] Directory: (1) SysData: system data, including data files of standard modules, system registration files, etc.; (2) UserData: user data, storing user configuration data.

[0046] The specific operations are as follows:

[0047] 1. As Figure 2 As shown, enter the main interface, in the top menu, select "System" Engineer Environment (the password can be set in the UserData\UserMsg.txt file);

[0048] 2. Enter the control configuration. There are three pages under the directory: DCS, Patrol, and Front End. Click any page to perform configuration.

[0049] Specifically, the module of the DCS configuration page is mainly used to communicate with the DCS. It consists of 1 port connection module and 5 data modules to send data to the DCS. The 5 data modules are as follows:

[0050] The DCS_Connect port connects to the module. The module is set to "slave communication" to receive DCS commands

[0051] QJGBWD_Data steam turbine cylinder wall temperature data module.

[0052] ZCHYWD_Data bearing return oil temperature data module.

[0053] GSBZW_Data water supply pump shaft temperature data module.

[0054] QBBW_Data steam drum wall temperature data module.

[0055] QD_Data front-end temperature data module (boiler auxiliary machine)

[0056] Specifically, the module of the patrol configuration page is mainly used to complete the communication with the on-site patrol, and is composed of 4 port connection modules and 4 data modules to complete the data collection of the patrol.

[0057] 1) Port connection module: The module is set to "main communication" and sends commands to the patrol test.

[0058] QJGBWD_Connect turbine cylinder wall temperature port connection module (COM6);

[0059] ZCHYWD_Connect bearing oil return temperature port connection module (COM3);

[0060] GSBZW_Connect water supply pump shaft temperature port connection module (COM4);

[0061] QBBW_Connect drum wall temperature port connection module (COM5).

[0062] 2) Data acquisition module, sends commands to the patrol test, receives and processes the data from the patrol test

[0063] QJGBWD_Data steam turbine cylinder wall temperature data module;

[0064] ZCHYWD_Data bearing oil return temperature data module;

[0065] GSBZW_Data water supply pump shaft temperature data module;

[0066] QBBW_Data steam drum wall temperature data module.

[0067] 3) Patrol communication protocol:

[0068] Send command:

[0069] Send hexadecimal "FE", which is -2 in decimal. The survey instrument prepares data, delays for 2 seconds (very important, otherwise the received data will be incomplete), and then sends the machine number, which is a character. For example, if the machine number is 1, send hexadecimal "31", which is 49 in decimal.

[0070] Data format: character type

[0071] #XCR 3 bytes, #machine number, enter

[0072] XX-XX:XXCR 9 bytes, day-hour:minute

[0073] XXXXXXXXXXXXXXXXCR 16 bytes, 2-3 dot sequence, 6-10 data

[0074] …

[0075] FF end code

[0076] Specifically, the module of the front-end configuration page is mainly used to complete the communication with the on-site front-end. It consists of 1 port connection module and 6 data modules to complete the data collection of the front-end.

[0077] qd_CONNECT front-end port connection module (COM7);

[0078] QD_YF1 A induced draft data module;

[0079] QD_YF2 induced draft data module;

[0080] QD_SF1 A air supply data module;

[0081] QD_SF2 B air supply data module;

[0082] QD_MM1 A coal grinding data module;

[0083] QD_MM2 B coal grinding data module.

[0084] The front end uses 485 communication, and the communication protocol is the ModeBus_RTU standard method.

[0085] Specifically, if the measurement point of the patrol or front end is broken, it is necessary to change the measurement point position. The method is as follows:

[0086] Step 1: Determine the point where the on-site temperature needs to be changed. The data is a 2-byte integer, multiplied by 0.1 to get the on-site temperature data;

[0087] Step 2: Change the wiring on the survey or front end, change the Chinese name of the corresponding point on the survey or front end page, delete the Chinese name of the original point or mark the point as broken, and keep a record;

[0088] Step 3: Change its input connection in the DCS configuration page.

[0089] The operation of adding a module is as follows: right-click in the control configuration area, select Add Module, and the following window will pop up: Figure 3 As shown; To set the module operation: double-click the module or right-click in the control configuration area and select Properties, the following window will pop up, as shown Figure 4 As shown: The signal connection between modules is as follows: Figure 5 , Figure 6 As shown, 1) Connect with a connection line: Press the left mouse button on the input terminal (small black square) and drag it to the desired output terminal to achieve the connection; 2) Set the connection method: In the module property setting window, select the "Input" tab, double-click the "Connection Text" of each parameter, and select the output parameter to be connected. After setting the connection method, the connection line can be automatically drawn (automatically draw the connection line: right-click the input terminal and select "Automatically add connection lines" to automatically draw the connection line).

[0090] Furthermore, the connection method must be noted: 1) only inputs can be connected to outputs; 2) if the input is connected, there must be either a connection line or connection text.

[0091] Furthermore, the basic parameters of the above modules are as follows:

[0092] Module name: Defined when adding a module, once confirmed, cannot be modified

[0093] Module type: Select when adding a module and cannot be modified

[0094] Execution cycle - the module running cycle, in seconds

[0095] Execution phase----module execution phase, the purpose of this parameter is to reduce the CPU burden. The shortest cycle of system execution is 1 second. To reduce the CPU burden, some modules can adjust the cycle and reduce the execution frequency. When the cycle of many modules is set to be greater than 1, although the execution frequency is reduced, if there is no phase adjustment, all modules must be executed in one cycle, and the CPU load in this cycle is still very large. Through phase adjustment and staggered execution, the CPU load will be greatly reduced.

[0096] Execution sequence number - the order in which the modules are executed

[0097] Manual / Automatic----When the module is in manual mode, the internal functions will not be executed.

[0098] Display type---Display all: Display input / output parameters, module name

[0099] Simple display: Display module name

[0100] Simple display: only display modules

[0101] Specifically, the module includes a serial port connection module COM_CONNECT and a serial port data module COM_DATA.

[0102] The function of the serial port connection module is to connect to the specified serial port according to the set parameters, and to schedule the connected data module to perform read / write data tasks according to the communication type (master communication, slave communication). Master communication means that the module acts as a host, and according to the execution cycle of the module, the connected data module is scheduled to perform read / write data tasks; slave communication means that the module acts as a slave, waiting to receive read / write commands from other hosts (such as DCS), and the host command schedules the connected data module to perform read / write data tasks.

[0103] The function of the serial port data module COM_DATA is to read / write data according to the connected serial port connection module. The main communication type is to write data to the port according to the input parameters, then receive the data, and then convert the received data into output data according to the settings. The slave communication type receives the data from the port, converts the input parameters according to the settings, and writes data to the port.

[0104] The DCS control system uses the FBM224 communication card, which communicates with the Modbus slave device in Modbus RTU master mode and can connect up to 64 slave devices. There are 4 ports on the FBM224, which can be used individually or ports 1 and 2, 3 and 4 can be used as redundant ports. Each port can be set to RS-232, RS-422 or RS-485 communication link.

[0105] The specific operations for DCS port settings and configuration are as follows:

[0106] F224 communication card settings:

[0107] 1) If Figure 7 As shown, click Config->ModbusPort to enter the FBM224 port configuration interface, where PORTMODE: select the communication mode of the port: RS-232, RS485, RS422; BAUD RATE: define the baud rate of communication; PARITY: define the parity check; STOP BITS: define the stop bit, which is related to the parity mode and cannot be modified. After the settings are completed, save it, and the system will save it as a file with the suffix MMA. The file name must be uppercase, and its suffix is ​​.MMA.

[0108] 2) If Figure 8 As shown, set FBM224 in ECB. It should be noted that the parameters of PORTEX are filled in according to Table 1. This parameter indicates the enabled status of the port of FBM224. If only PORT1 is used, fill in 1 here. Fill in 15 to open all 4 ports. Unused ports can be closed in the system management. Then fill in FILEID with the MMA file set and saved in the previous step.

[0109] Table 1

[0110]

[0111] Communication settings:

[0112] 1) If Fig. 9 As shown, click Config->ModbusDevice to enter the configuration interface and define the data that needs to be read in the station (we set a device that needs to be read as a station, and our FBM224 is a bus-type port. Multiple devices can be on a bus. Each device has a corresponding station number).

[0113] Used: Check to enable;

[0114] Scan Rate: indicates the port scanning speed;

[0115] Function Code: Users need to set the parameters according to the parameters provided by the device manufacturer;

[0116] Start Address: The starting address of the variable to be read;

[0117] Number Data: The number of registers accessed (2 bytes).

[0118] If you need to fill in multiple variables that need to be read, use Open the next page. 64 pages can be defined in one station. One page can read up to 125 registers (16-bit registers), 1000 coils, 62 floating point numbers, and 1000 switch values. Therefore, one station can read up to: 62×64=3968 floating point numbers, 1000×64=64000 switch values. After all settings are completed, save them. The system will save them as a file with the suffix MSL.

[0119] 2) If Fig.10 As shown, the slave device control module ECB201 is configured. ECB201 is usually built together with ECB200. Each ECB201 corresponds to a Modbus slave device. The ECB201 module configuration parameters are:

[0120] Module name (Name), usually taken from the device name

[0121] Module type (Type), ECB201;

[0122] From the device number (DEV_ID), usually the name of the device, up to 6 characters. For SMDH display;

[0123] Hardware type (HWTYPE), 224;

[0124] software type (SWTYPE), 224;

[0125] ECB200 module name (PARENT), fill in the corresponding ECB200 module name;

[0126] Slave device name (DVNAME), fill in the address number of the slave device, 1-247, fill in according to the actual address of the slave device;

[0127] Slave device address (DVADDR), can be left blank or be the same as the slave device name;

[0128] From the device port type (DVOPTS), fill in DUAL for redundancy mode, otherwise leave it blank;

[0129] FBM224 port number (PORTNO), the port number that the slave device uses to connect to the FBM224: 1–4,

[0130] When in redundant mode, it can be 1 or 2; 3 or 4;

[0131] Slave device handle file (FILEID), the handle file name used by the slave device, such as ESD.MSL.

[0132] 3) Setting takes effect: Fig.11 As shown, enter the system management, find the FBM224 module, and select the EQUIP CHG button to proceed as follows Fig.11 Interface, first turn the module to OFF-LINE, then select DB DOWNLOAD, the system will download the data of the MMA file set by the user to FBM224 and then turn it to ON-LINE mode; Fig.12 As shown, click NEXT LEVEL of FBM224 to see the corresponding station information set by the user. Similarly, click EQUIP CHG to enter the device definition interface, switch the module to OFF-LINE and select DB DOWNLOAD. The system will download the corresponding MSL file information to the CP. If the module is displayed in white, it means that communication has been established.

[0133] 4) Create a data module to display the device data in IA: DCS can define several types of blocks in Table 2, and only need to modify the corresponding parameters. Fill in the data address to be read, the format is:

[0134] <processing segment number><address in the segment number>[<data type>][<byte swap>]

[0135] Description: Processing segment number: The processing segment number defined in the device processing file, 1 to 64;

[0136] The address in this segment number is represented by Ax, where x represents the address;

[0137] Data type: when represented by Sx, short integer;

[0138] When expressed as Cx, Boolean value, x is the number of bits read (1 to 32);

[0139] When represented by Ux, it is an unsigned integer, and x is the number of bytes read (1 to 4);

[0140] When expressed as Fx, floating point number,

[0141] Byte swap: Wx represents the code (0 to 3) for swapping bits or bytes corresponding to different data types. The default value is W0 (no swap).

[0142] For example, 12A201F4:12 means the 12th page is read, which is consistent with the definition of MODBUSDEVICE; A201 means the starting address of the variable is 201; F means the variable is a floating point number. 4 means the length is 4 bytes.

[0143] Table 2

[0144]

[0145] In summary, the technical solution of this application has the following beneficial effects:

[0146] 1. The present invention collects measurement data centrally through different field data front ends, collects them to the industrial computer using bus communication, and uniformly communicates with the DCS control system. The DCS control system uses WinCcfg configuration software to realize port conversion and communication protocol conversion, and completes the integration of different communication protocols. The use of this application can save DCS construction costs.

[0147] 2. This application uses an 8-in-1 communication board that can support 8 RS232 ports. Through RS232 / RS485 conversion, it can support RS485 communication and increase the communication distance.

[0148] 3. The communication configuration software used in the present invention can facilitate visual configuration of communication protocols and communication data, which is convenient and intuitive, and perfectly solves the communication problem between DCS and different detection equipment in the prior art.

[0149] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A DCS communication system for different detection equipment in a power plant, characterized in that: include: Communication board, connecting multiple on-site front-end data acquisition devices and patrol equipment through ports; An industrial computer is connected to the communication board using a communication bus, and the industrial computer is provided with a WinCcfg configuration software system; A DCS control system connected to the industrial computer; The WinCcfg configuration software system includes a DCS configuration page, a patrol configuration page and a front-end configuration page. The module of the DCS configuration page is used to complete the communication with the DCS control system, the patrol configuration page is used to complete the collection of on-site patrol data, and the front-end configuration page is used for front-end data collection. Wherein, the DCS control system adopts the FBM224 communication card, and the port of the FBM224 communication card is connected to the industrial computer; the DCS control system sets the communication mode of the port through the port configuration interface of the FBM224 communication card.

2. A DCS communication system for different detection equipment in a power plant according to claim 1, characterized in that: The communication board adopts an 8-in-1 communication board, and the 8-in-1 communication board supports 8 RS232 ports.

3. A DCS communication system for different detection equipment in a power plant according to claim 2, characterized in that: The port of the 8-in-1 communication board supports RS232 / RS485 conversion, thereby increasing the communication distance.

4. A DCS communication system for different detection equipment in a power plant according to claim 1, characterized in that: The FBM224 communication card has 4 ports, each of which can be set as an RS-232, RS-422 or RS-485 communication link.

5. A DCS communication system for different detection equipment in a power plant according to claim 1, characterized in that: The DCS configuration page consists of 1 port connection module and 5 data modules. The port connection module is set to a slave communication type for receiving DCS control system commands. The 5 data modules are a steam turbine cylinder wall temperature data module, a bearing return oil temperature data module, a feed water pump shaft temperature data module, a steam drum wall temperature data module and a front end temperature data module.

6. A DCS communication system for different detection equipment in a power plant according to claim 1, characterized in that: The patrol configuration page consists of 4 port connection modules and 4 data acquisition modules. In the patrol configuration page, the port connection module is set to "main communication" for sending commands to the patrol equipment; The data acquisition module is used to send commands to the patrol equipment and receive and process data from the patrol equipment.

7. A DCS communication system for different detection equipment in a power plant according to claim 6, characterized in that: The four port connection modules are a steam turbine cylinder wall temperature port connection module, a bearing return oil temperature port connection module, a feed water pump shaft temperature port connection module and a steam drum wall temperature port connection module; the four data acquisition modules are a steam turbine cylinder wall temperature data module, a bearing return oil temperature data module, a feed water pump shaft temperature data module and a steam drum wall temperature data module.

8. A DCS communication system for different detection equipment in a power plant according to claim 1, characterized in that: The front-end configuration page is composed of 1 front-end port connection module and 6 data modules. The front-end device adopts 485 communication, and the communication protocol is the ModeBus_RTU standard method.

9. A DCS communication system for different detection equipment in a power plant according to claim 8, characterized in that: The six data modules are A-induced draft data module, B-induced draft data module, A-supply air data module, B-supply air data module, A-coal grinding data module, and B-coal grinding data module.

10. Application of the DCS communication system for different detection equipment in a power plant as claimed in any one of claims 1 to 9 in the reconstruction of a DCS system of a power plant unit.

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