CN110460542B - Nuclear power plant DCS (distributed control System) cascading data exchange system and data exchange method thereof - Google Patents
Nuclear power plant DCS (distributed control System) cascading data exchange system and data exchange method thereof Download PDFInfo
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- CN110460542B CN110460542B CN201910744009.6A CN201910744009A CN110460542B CN 110460542 B CN110460542 B CN 110460542B CN 201910744009 A CN201910744009 A CN 201910744009A CN 110460542 B CN110460542 B CN 110460542B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/15—Interconnection of switching modules
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/90—Buffering arrangements
- H04L49/9021—Plurality of buffers per packet
Abstract
The invention discloses a nuclear power plant DCS system cascade data exchange system, which comprises a plurality of cabinets, a plurality of optimized modules PLM, an optimized management module PM, an optimized communication module PCOM, a master control station and an engineer station, wherein each cabinet is internally provided with a plurality of cabinets; the optimal selection module PLM in the same case interacts data with the optimal selection management module PM in the case through the SPI bus; data are interacted between the preferable management modules PM of adjacent chassis in the same cabinet in a transparent transmission mode through an optical fiber link at a link layer, so that a cascade networking is formed; and the preferred management module PM of the first-level chassis in all the cabinets interacts data with the master control through the preferred communication module PCOM, and the master control interacts data with the engineer station.
Description
Technical Field
The invention relates to the field of nuclear power data interaction, in particular to a nuclear power plant DCS (distributed control system) cascade data exchange system and a data exchange method thereof.
Background
The specially-designed drive control system of the nuclear power plant is mainly responsible for specially-designed control equipment such as pumps, valves and the like of safety facilities, and is an important interface of 0-layer equipment. The number of preferred modules is large due to the large number of control valves in the nuclear power plant, generally more than 300. The control information of the preferred module needs to be reported to the engineer station for display, so the state information of the preferred module needs to be collected, and the preferred module is effectively monitored and managed because the number of the preferred module is large and the number of the communication interfaces of the master control station is limited, and the preferred module cannot be effectively monitored and managed through single-point communication.
It is therefore necessary to develop a communication system for the preferred module and the master station that provides timely notification of the fault status of the field devices.
Disclosure of Invention
The invention aims to provide a nuclear power plant DCS system cascade data exchange system which adopts a cascade mode to carry out data exchange, namely, machine boxes are cascaded, data are reported step by step, a first-stage machine box is communicated with a main control, and the problem that a main control communication interface is insufficient is solved.
The specific technical scheme of the invention is as follows: the nuclear power plant DCS system cascade data exchange system comprises a plurality of cabinets, a plurality of machine boxes are arranged in each cabinet, a plurality of optimized modules PLM are arranged in each machine box,
each case is internally provided with an optimal management module PM, and further comprises an optimal communication module PCOM, a master control station and an engineer station;
the optimal selection module PLM in the same case interacts data with the optimal selection management module PM in the case through the SPI bus;
data are interacted between the preferable management modules PM of adjacent chassis in the same cabinet in a transparent transmission mode through an optical fiber link at a link layer, so that a cascade networking is formed;
the optimization management modules PM of the first-stage chassis in all the cabinets exchange data with a master control through an optimization communication module PCOM, and the master control exchanges data with an engineer station;
the optimization management module PM of the chassis at the current stage is used for caching data of the optimization module PLM in the chassis at the current stage into the cache area A in a data frame 1 mode;
the optimization management module PM of the chassis at the current level is used for caching data of the optimization management module PM in the adjacent chassis at the lower level into the cache region B in a data frame 2 mode;
when the preferred management module PM of the current chassis is a preferred management module PM of a non-first chassis, the preferred management module PM of the current chassis is used for sequentially inquiring whether the cache regions a and B currently have a complete frame of data frames, and if the currently inquired cache regions have a complete frame of data frames, reading the complete frame of data frames in the cache regions and transmitting the data frames to the preferred management module PM of the previous chassis; if the current queried cache area does not have a complete data frame of one frame, querying the next cache area;
when the preferred management module PM of the current chassis is the preferred management module PM of the first chassis, the preferred management module PM of the current chassis is used for sequentially inquiring whether the cache regions a and B currently have a complete frame of data frames, and if the currently inquired cache regions have a complete frame of data frames, reading the complete frame of data frames in the cache regions and transmitting the data frames to the preferred communication module PCOM; if the current queried cache area does not have a complete data frame of one frame, querying the next cache area;
the preferred communication module PCOM is configured to receive the upload data of the preferred management module PM of the first-level chassis in all the cabinets and store the upload data in a designated cache area,
the preferred communication module PCOM is configured to collect chassis data of all the cabinets in a period, frame the data of all the cabinets to form a data frame 3, and send the data frame 3 to the main controller through the LVDS bus.
The principle of the scheme of the invention is as follows:
firstly, because there are more than 300 preferred modules in a set of DCS system, if each preferred module is connected with the main control separately, more than 300 interfaces are needed, which is not available for the main control, therefore, in order to solve the problem of insufficient main control interface, the invention adopts the idea of cascade transparent transmission to perform data transmission, wherein, in implementation, a preferred management module PM is arranged in each case, and adjacent preferred management modules PM are cascaded, that is, the preferred management module PM at the next stage transmits the data at the next stage and the data at the current stage to the upper stage, therefore, in the invention, the preferred management modules have 2 important data collection functions, the first is to collect the data of the preferred module PLM in the case, the second is to collect the data uploaded by the preferred management module PM at the next stage, and because the data of the case needs to be transmitted in the cascading process, It is also necessary to transmit the data of its lower level, and in order that the two parts of data will not collide, the present invention sets up a data frame mechanism, i.e. the data of the preferred module PLM in the current level chassis is framed. The preference management module PM then determines whether the current frame is complete, typically when uploading data, the data frame is incomplete, indicating that the data is still not being collected, and therefore cannot be uploaded, in this respect, the present invention opens up two buffer spaces, one for buffering the data of the preferred module PLM of the present chassis, one for buffering the data of the next level preferred management module PM, and stipulate the preferred management module PM of this level, need to transmit under the situation that its frame is complete, can solve the problem causing conflict while two kinds of data transmission in this way, meanwhile, the invention is also provided with an optimized communication module PCOM which can frame the data of the used cabinets, after the data transmission of all cabinets in a period is finished, a frame of data is formed and transmitted to the main control, therefore, the master control can receive the state data of the corresponding optimized modules under the corresponding chassis under all the cabinets in a certain period.
Preferably, the structures of the data frame 1 and the data frame 2 include a destination address, a source address, and PLM status data, where the source address is a chassis number configured by a dial switch on a chassis where the current preferred management module PM is located; the PLM status data comprises the status data of all the preferred modules PLM in the current chassis. The target address is the address of the preferred communication module PCOM.
Preferably, the structure of the data frame 3 includes a destination address, a source address, and cabinet PM status data, where the source address is configured according to an engineer station; the enclosure PM status data includes status data uploaded by each preferred management module PM of each enclosure. Wherein, the target address is the address of the master control.
Preferably, because the present invention is a cascade transmission, after the data is uploaded by the preferred management module of the next chassis, since the data of the preferred module of the current chassis may be being transmitted at this moment, the data cached previously in the preferred module of the current chassis is not read or is being read, and therefore the current cache region may not be in a non-idle state, and the data uploaded by the preferred management module of the next chassis needs to be cached, the present invention sets the cache region to 2 cache regions, and may also set the cache region to 3 cache regions or more, where the cache region B includes the cache region 2 and the cache region 3, and when the cache region 2 is in the non-idle state, the preferred management module PM of the current chassis caches the data of the preferred management module PM in the adjacent lower chassis to the cache region 3.
The number of the cabinets is 4, 4 cabinets are arranged in each cabinet, 12 optimized modules PLM are arranged in each cabinet, and each cabinet is provided with 1 optimized management module PM.
The data exchange method of the nuclear power plant DCS system cascade data exchange system comprises the following steps:
caching the current level of data: each optimized management module PM in each cabinet sequentially and circularly reads the state data of all optimized modules PLM in the same cabinet through the SPI bus, and obtains a data frame 1 to be cached in a cache area A after framing,
caching subordinate data: reading the data frame 2 needing to be transparently transmitted by each optimized management module PM of each next-level chassis in a transparent transmission mode at a link layer through an optical fiber link, and caching the data frame 2 needing to be transparently transmitted into an idle cache region B;
frame integrity determination: sequentially and circularly inquiring whether the data frames in the buffer area A and the buffer area B are complete frames or not;
if the current cache region has a complete frame of data frame, then transferring to the step of uploading data, if the current cache region has an incomplete frame of data frame, then inquiring the next cache region;
and data uploading: each optimized management module PM in each cabinet reads a complete data frame in the current buffer area to form data to be sent;
if the current preferred management module PM is not the preferred management module PM of the first-stage case, the data to be sent is sent to the preferred management module PM of the last-stage case;
if the current preferred management module PM is the preferred management module PM of the first-level chassis, sending data to be sent to a preferred communication module PCOM;
a cabinet data uploading step: and identifying and analyzing the source address of the data frame of each optimized management module PM by using the optimized communication module PCOM, caching the corresponding data frame into a specified cache region according to the source address, and after finishing caching the data frames of the optimized management modules PM of all cabinets, framing to form a data frame 3 and transmitting the data frame 3 to the master control.
The above method can be summarized as a data transmission process between the preferred management module PM and the preferred communication module PCOM within the same cabinet.
Preferably, in the above method, the structures of the data frame 1 and the data frame 2 include a destination address, a source address, and PLM status data, where the source address is a chassis number configured by a dial switch on a chassis where the current preferred management module PM is located; the PLM status data comprises the status data of all the preferred modules PLM in the current chassis.
Preferably, in the above method, the structure of the data frame 3 includes a destination address, a source address, and cabinet PM status data, where the source address is configured according to an engineer station; the enclosure PM status data includes status data uploaded by each preferred management module PM of each enclosure.
Preferably, in the above method, the buffer B includes a buffer 2 and a buffer 3, and when the buffer 2 is in a non-idle state, the preferred management module PM buffers data of the preferred management module PM in the adjacent lower chassis to the buffer 3.
Preferably, the method further includes the step of sending data: the engineer station configures the issued data and sends the data to the master control, the master control transmits the data to the optimal management module PM of the first-stage case of each cabinet through the optimal communication module PCOM, the optimal management module PM of the adjacent case receives the issued data through the optical fiber link, and the optimal management module PM of the current-stage case broadcasts the issued data to the optimal management module PLM through the SPI bus.
Compared with the prior art, the invention has the following advantages and beneficial effects: the problem of when readback preferred module data, master control interface is not enough is solved, the technological obstacle of supervision preferred module has effectively been solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of a single cabinet communication line connection.
Fig. 2 is a schematic view of the connection of a single cabinet to a preferred communication module PCOM.
Fig. 3 is a schematic diagram of communication line connection of 4 cabinets.
Fig. 4 is a connection diagram of a chassis.
Fig. 5 is a flowchart of buffering data frames 1 and 2.
Fig. 6 shows the frame structure of data frame 1 and data frame 2.
Fig. 7 shows a frame structure of the data frame 3.
Fig. 8 is a data frame structure for chassis configuration data reframing.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not to be construed as limiting the present invention.
Example 1
As shown in fig. 1-8:
as shown in fig. 1, fig. 2, fig. 3 and fig. 4, the cascade data exchange system of the nuclear power plant DCS system includes 4 cabinets, each cabinet having 12 preferred modules PLM,
each case is internally provided with an optimal management module PM, and further comprises an optimal communication module PCOM, a master control station and an engineer station; in the whole system, 16 preferred management modules PM, 16 redundant preferred management modules PM, 1 redundant preferred communication module PCOM and a master controller are provided.
In the above system, one preferred communication module PCOM corresponds to 4 cabinets, but one master may correspond to 2 preferred communication modules PCOM, so that one master may correspond to 192 × 2 preferred modules PLM, and the control amount thereof reaches 384.
As shown in fig. 4, the preference module PLM in the same chassis interacts data with the preference management module PM in the local chassis through the SPI bus;
as shown in fig. 1 and fig. 2, data exchange is performed between the preferred management modules PM of adjacent chassis in the same cabinet in a transparent transmission manner at a link layer through an optical fiber link, so as to form a cascaded networking;
as shown in fig. 2, the preferred management module PM of the first-level chassis in all the cabinets interacts data with the master control through the preferred communication module PCOM, and the master control interacts data with the engineer station;
as shown in fig. 5, the optimization management module PM of the present chassis is configured to cache data of the optimization module PLM in the present chassis to the buffer a in a data frame 1 manner;
as shown in fig. 5, the preferred management module PM of the present chassis is configured to buffer data of the preferred management module PM in the adjacent lower chassis to the buffer B in a data frame 2 manner;
as shown in fig. 2 and 5, when the preferred management module PM of the current chassis is a preferred management module PM of a non-first chassis, the preferred management module PM of the current chassis is configured to sequentially query whether there is a complete frame of data frame currently in the buffer a and the buffer B, and if there is a complete frame of data frame currently in the queried buffer, read the complete frame of data frame in the buffer and transmit the read complete frame of data frame to the preferred management module PM of the previous chassis; if the current queried cache area does not have a complete data frame of one frame, querying the next cache area;
as shown in fig. 2 and 5, when the preferred management module PM of the current chassis is the preferred management module PM of the first chassis, the preferred management module PM of the current chassis is configured to sequentially query whether there is a complete frame of data frame currently in the buffer a and the buffer B, and if there is a complete frame of data frame currently in the queried buffer, read the complete frame of data frame in the buffer and transmit the read complete frame of data frame to the preferred communication module PCOM; if the current queried cache area does not have a complete data frame of one frame, querying the next cache area;
as shown in fig. 3, the preferred communication module PCOM is configured to receive the upload data of the preferred management module PM of the first-level chassis in all the cabinets and store the upload data in the designated cache area,
as shown in fig. 3, the preferred communication module PCOM is configured to collect chassis data of all the cabinets in a period, frame the data of all the cabinets to form a data frame 3, and send the data frame 3 to the master through the LVDS bus.
The principle of the scheme of the invention is as follows:
firstly, because there are more than 300 preferred modules in a set of DCS system, if each preferred module is connected with the main control separately, more than 300 interfaces are needed, which is not available for the main control, therefore, in order to solve the problem of insufficient main control interface, the invention adopts the idea of cascade transparent transmission to perform data transmission, wherein, in implementation, a preferred management module PM is arranged in each case, and adjacent preferred management modules PM are cascaded, that is, the preferred management module PM at the next stage transmits the data at the next stage and the data at the current stage to the upper stage, therefore, in the invention, the preferred management modules have 2 important data collection functions, the first is to collect the data of the preferred module PLM in the case, the second is to collect the data uploaded by the preferred management module PM at the next stage, and because the data of the case needs to be transmitted in the cascading process, It is also necessary to transmit the data of its lower level, and in order that the two parts of data will not collide, the present invention sets up a data frame mechanism, i.e. the data of the preferred module PLM in the current level chassis is framed. The preference management module PM then determines whether the current frame is complete, typically when uploading data, the data frame is incomplete, indicating that the data is still not being collected, and therefore cannot be uploaded, in this respect, the present invention opens up two buffer spaces, one for buffering the data of the preferred module PLM of the present chassis, one for buffering the data of the next level preferred management module PM, and stipulate the preferred management module PM of this level, need to transmit under the situation that its frame is complete, can solve the problem causing conflict while two kinds of data transmission in this way, meanwhile, the invention is also provided with an optimized communication module PCOM which can frame the data of the used cabinets, after the data transmission of all cabinets in a period is finished, a frame of data is formed and transmitted to the main control, therefore, the master control can receive the state data of the corresponding optimized modules under the corresponding chassis under all the cabinets in a certain period.
As shown in fig. 6, preferably, the structures of the data frame 1 and the data frame 2 include a destination address, a source address, and PLM status data, where the source address is a chassis number configured by a dial switch on a chassis where the current preferred management module PM is located; the PLM status data comprises the status data of all the preferred modules PLM in the current chassis.
As shown in fig. 7, preferably, the structure of the data frame 3 includes a destination address, a source address, and cabinet PM status data, where the source address is configured according to an engineer station; the enclosure PM status data includes status data uploaded by each preferred management module PM of each enclosure.
As shown in fig. 5, preferably, because the present invention is a cascade transmission, after the preferred management module of the next chassis finishes uploading data, since data of the preferred module of the current chassis may be being transmitted at this moment, the data cached previously by the preferred module of the current chassis is not yet read or is being read, and thus the current cache region may not be in a non-idle state, and needs to cache the data uploaded by the preferred management module of the next chassis, the present invention sets the cache region to 2 cache regions, and may also set to 3 cache regions or more, where the cache region B includes a cache region 2 and a cache region 3, and when the cache region 2 is in the non-idle state, the preferred management module PM of the current chassis caches data of the preferred management module PM in the adjacent lower chassis to the cache region 3.
Example 2
As shown in fig. 5, the data exchange method of the nuclear power plant DCS cascade data exchange system includes the following steps:
caching the current level of data: each optimized management module PM in each cabinet sequentially and circularly reads the state data of all optimized modules PLM in the same cabinet through the SPI bus, and obtains a data frame 1 (data required to be sent by the cabinet) after framing to cache in a cache area A,
caching subordinate data: reading a data frame 2 (data to be transparently transmitted by an adjacent chassis) which needs to be transparently transmitted by each preferred management module PM of each next chassis in a transparent transmission mode at a link layer through an optical fiber link, and caching the data frame 2 to be transparently transmitted into an idle cache region B;
frame integrity determination: sequentially and circularly inquiring whether the data frames in the cache region A (cache region 1) and the cache region B (cache region 2 and cache region 3) are a complete frame;
if the current cache region has a complete frame of data frame, then transferring to the step of uploading data, if the current cache region has an incomplete frame of data frame, then inquiring the next cache region;
and data uploading: each optimized management module PM in each cabinet reads a complete data frame in the current buffer area to form data to be sent;
if the current preferred management module PM is not the preferred management module PM of the first-stage case, the data to be sent is sent to the preferred management module PM of the last-stage case;
if the current preferred management module PM is the preferred management module PM of the first-level chassis, sending data to be sent to a preferred communication module PCOM;
a cabinet data uploading step: and identifying and analyzing the source address of the data frame of each optimized management module PM by using the optimized communication module PCOM, caching the corresponding data frame into a specified cache region according to the source address, and after finishing caching the data frames of the optimized management modules PM of all cabinets, framing to form a data frame 3 and transmitting the data frame 3 to the master control.
The data interaction between the PLM and the PM is uploading data interaction: the PM sequentially and circularly reads the state data of 12 PLMs in the case through the SPI bus and stores the state data into a corresponding slot position designated area, and after the state data of the 12 PLMs are completely read, the PM is packaged and sent out, and is directly sent to the PCOM for the PM of the first level, and is sent to the adjacent PM of the previous level for other PMs. When issuing data, the PM reads configuration data system storage area data of 12 PLMs and sequentially issues configuration data to the corresponding PLMs through the SPI, each PLM distinguishes whether to analyze the issued data through independent chip selection, and a frame format of the issued data can refer to fig. 8.
For data interaction between the PMs, please refer to fig. 5, the uploading and the issuing are all transparent transmission through the link layer, and data between the PMs is not analyzed, that is, the data frame 1 and the data frame 2 are not analyzed.
For data interaction between the PM and the PCOM, when data is uploaded, the PCOM sequentially receives data of the PMs in all the first-level chassis, identifies and analyzes a source address of the obtained data, stores the data of the corresponding chassis in a designated cache region, frames the data in the cache region after completing caching the data of the PMs in all the first-level chassis in one period, namely after completing caching the data of all the chassis, frames the data in the cache region according to a format shown in fig. 7, finally sends a data frame 3 to a master control through LVDS, and the master control transmits the data frame to a corresponding workstation according to a configuration of an engineer station. When the PCOM receives the configuration data frame format sent by the master control and is consistent with the uploaded data, the PCOM extracts the configured sent data of the chassis corresponding to each cabinet at the specified address, distributes the data to the PM of each chassis according to the sent data frame structure, and distributes the data to the PLM by the PM, referring to the frame structure of fig. 8.
The above method can be summarized as a data transmission process between the preferred management module PM and the preferred communication module PCOM within the same cabinet.
Preferably, in the above method, the structures of the data frame 1 and the data frame 2 include a destination address, a source address, and PLM status data, where the source address is a chassis number configured by a dial switch on a chassis where the current preferred management module PM is located; the PLM status data comprises the status data of all the preferred modules PLM in the current chassis.
Preferably, in the above method, the structure of the data frame 3 includes a destination address, a source address, and cabinet PM status data, where the source address is configured according to an engineer station; the enclosure PM status data includes status data uploaded by each preferred management module PM of each enclosure.
Preferably, in the above method, the buffer B includes a buffer 2 and a buffer 3, and when the buffer 2 is in a non-idle state, the preferred management module PM buffers data of the preferred management module PM in the adjacent lower chassis to the buffer 3.
Preferably, the method further includes the step of sending data: the engineer station configures the issued data and sends the data to the master control, the master control transmits the data to the optimal management module PM of the first-stage case of each cabinet through the optimal communication module PCOM, the optimal management module PM of the adjacent case receives the issued data through the optical fiber link, and the optimal management module PM of the current-stage case broadcasts the issued data to the optimal management module PLM through the SPI bus. As shown in fig. 8, when the frame format of the distributed configuration data received by the preferred communication module PCOM from the master control is consistent with the frame format of the uploaded data, the preferred communication module PCOM parses the chassis configuration data corresponding to each cabinet in the distributed configuration data, then re-frames the chassis configuration data of each cabinet as shown in fig. 8, and then distributes the chassis configuration data to the corresponding cabinet through each corresponding interface, and then the preferred management module PM in the chassis parses the data frame shown in fig. 8 to obtain the PLM configuration data therein, and distributes the PLM configuration data to each corresponding PLM.
As shown in fig. 8, the data frame structure of the chassis configuration data reframing frame includes a destination address, a source address, and configuration data of each preferred module PLM, where the destination address is a chassis number, and the source address is an address of a preferred communication module PCOM.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. Nuclear power plant DCS system cascades data exchange system, including a plurality of cabinets, be provided with a plurality of quick-witted casees in every cabinet, dispose a plurality of preferred module PLM in every quick-witted incasement, its characterized in that:
each case is internally provided with an optimal management module PM, and further comprises an optimal communication module PCOM, a master control station and an engineer station;
the optimal selection module PLM in the same case interacts data with the optimal selection management module PM in the case through the SPI bus;
data are interacted between the preferable management modules PM of adjacent chassis in the same cabinet in a transparent transmission mode through an optical fiber link at a link layer, so that a cascade networking is formed;
the optimization management modules PM of the first-stage chassis in all the cabinets exchange data with a master control through an optimization communication module PCOM, and the master control exchanges data with an engineer station;
the optimization management module PM of the chassis at the current stage is used for caching data of the optimization module PLM in the chassis at the current stage into the cache area A in a data frame 1 mode;
the optimization management module PM of the chassis at the current level is used for caching data of the optimization management module PM in the adjacent chassis at the lower level into the cache region B in a data frame 2 mode;
when the preferred management module PM of the current chassis is a preferred management module PM of a non-first chassis, the preferred management module PM of the current chassis is used for sequentially inquiring whether the cache regions a and B currently have a complete frame of data frames, and if the currently inquired cache regions have a complete frame of data frames, reading the complete frame of data frames in the cache regions and transmitting the data frames to the preferred management module PM of the previous chassis; if the current queried cache area does not have a complete data frame of one frame, querying the next cache area;
when the preferred management module PM of the current chassis is the preferred management module PM of the first chassis, the preferred management module PM of the current chassis is used for sequentially inquiring whether the cache regions a and B currently have a complete frame of data frames, and if the currently inquired cache regions have a complete frame of data frames, reading the complete frame of data frames in the cache regions and transmitting the data frames to the preferred communication module PCOM; if the current queried cache area does not have a complete data frame of one frame, querying the next cache area;
the preferred communication module PCOM is configured to receive the upload data of the preferred management module PM of the first-level chassis in all the cabinets and store the upload data in a designated cache area,
the preferred communication module PCOM is configured to collect chassis data of all the cabinets in a period, frame the data of all the cabinets to form a data frame 3, and send the data frame 3 to the main controller through the LVDS bus.
2. The nuclear power plant DCS system cascading data exchange system of claim 1, wherein the structure of the data frame 1 and the data frame 2 comprises a target address, a source address and PLM status data, wherein the source address is a box number configured by a dial switch on a box where the current preferred management module PM is located; the PLM status data comprises the status data of all the preferred modules PLM in the current chassis.
3. The nuclear power plant DCS system cascading data exchange system of claim 1, wherein the structure of the data frame 3 comprises a destination address, a source address, cabinet PM status data, the source address configured according to an engineer station; the enclosure PM status data includes status data uploaded by each preferred management module PM of each enclosure.
4. The DCS system cascade data exchange system for the nuclear power plant according to claim 1, wherein the buffer area B comprises a buffer area 2 and a buffer area 3, and when the buffer area 2 is in a non-idle state, the preferred management module PM of the current chassis buffers data of the preferred management module PM of the next chassis to the buffer area 3.
5. The nuclear power plant DCS system cascade data exchange system of claim 1, wherein the number of cabinets is 4, there are 4 chassis in each cabinet, there are 12 preferred modules PLM in each chassis, and there are 1 preferred management module PM in each chassis.
6. The data exchange method of the nuclear power plant DCS system cascade data exchange system is characterized by comprising the following steps:
caching the current level of data: each optimized management module PM in each cabinet sequentially and circularly reads the state data of all optimized modules PLM in the same cabinet through the SPI bus, and obtains a data frame 1 to be cached in a cache area A after framing,
caching subordinate data: reading the data frame 2 needing to be transparently transmitted by each optimized management module PM of each next-level chassis in a transparent transmission mode at a link layer through an optical fiber link, and caching the data frame 2 needing to be transparently transmitted into an idle cache region B;
frame integrity determination: sequentially and circularly inquiring whether the data frames in the buffer area A and the buffer area B are complete frames or not;
if the current cache region has a complete frame of data frame, then transferring to the step of uploading data, if the current cache region has an incomplete frame of data frame, then inquiring the next cache region;
and data uploading: each optimized management module PM in each cabinet reads a complete data frame in the current buffer area to form data to be sent;
if the current preferred management module PM is not the preferred management module PM of the first-stage case, the data to be sent is sent to the preferred management module PM of the last-stage case;
if the current preferred management module PM is the preferred management module PM of the first-level chassis, sending data to be sent to a preferred communication module PCOM;
a cabinet data uploading step: and identifying and analyzing the source address of the data frame of each optimized management module PM by using the optimized communication module PCOM, caching the corresponding data frame into a specified cache region according to the source address, and after finishing caching the data frames of the optimized management modules PM of all cabinets, framing to form a data frame 3 and transmitting the data frame 3 to the master control.
7. The data switching method according to claim 6, wherein the structures of the data frame 1 and the data frame 2 include a destination address, a source address, and PLM status data, wherein the source address is a chassis number configured by a dial switch on a chassis where the current preferred management module PM is located; the PLM status data comprises the status data of all the preferred modules PLM in the current chassis.
8. The data switching method according to claim 6, wherein the structure of the data frame 3 comprises a destination address, a source address, cabinet PM status data, the source address being configured according to an engineer station; the enclosure PM status data includes status data uploaded by each preferred management module PM of each enclosure.
9. The data exchange method according to claim 6, wherein the buffer B includes a buffer 2 and a buffer 3, and when the buffer 2 is in a non-idle state, the preferred management module PM buffers data of the preferred management module PM in an adjacent lower chassis to the buffer 3.
10. The data exchange method according to any one of claims 6 to 9, further comprising the step of data distribution: the engineer station configures the issued data and sends the data to the master control, the master control transmits the data to the optimal management module PM of the first-stage case of each cabinet through the optimal communication module PCOM, the optimal management module PM of the adjacent case receives the issued data through the optical fiber link, and the optimal management module PM of the current-stage case broadcasts the issued data to the optimal management module PLM through the SPI bus.
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