CN115766595B - PLC internal rapid scanning communication system - Google Patents
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- CN115766595B CN115766595B CN202211174436.3A CN202211174436A CN115766595B CN 115766595 B CN115766595 B CN 115766595B CN 202211174436 A CN202211174436 A CN 202211174436A CN 115766595 B CN115766595 B CN 115766595B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a PLC internal rapid scanning communication system, which comprises: the master station, a plurality of bottom plates under the master station and a plurality of slave stations under the bottom plates; the master station data and the slave station data both have priority attributes; the base plate and a plurality of subordinate slave stations adopt parallel scanning, and transmit and receive data through full duplex connection; the master station and the bottom plate form a communication ring network, and periodically perform cyclic data transmission; if the bottom plate scans the low-priority secondary station data, uploading the low-priority secondary station data to the primary station through cyclic data transmission; if the base plate scans the data of the secondary station with high priority, the data is uploaded to the primary station through active transmission; if the master station has the master station data with low priority, transmitting the master station data to the bottom plate through cyclic data transmission; and if the master station has the master station data with high priority, the master station data is transmitted to the bottom plate through active transmission. The invention can improve the PLC data sharing efficiency and shorten the scanning period of the master station.
Description
Technical Field
The invention relates to a PLC internal rapid scanning communication system, and belongs to the technical field of PLC internal communication.
Background
Along with the continuous development of industrial control technology, the application of the programmable controller is more and more extensive, and the internal communication mode of the PLC determines the data scanning period of the programmable controller, so that the programmable controller is a key factor affecting the control performance of the PLC. The current PLC internal communication generally adopts a single communication mode, such as a field bus based on CAN, RS485 or Ethernet, adopts a serial architecture and a parallel communication architecture, and CAN adopt various communication modes, such as periodic I/O, global I/O, a master-slave bus, a token bus, a floating master station, CSMA/CD, a token ring and the like.
The internal communication modes of the PLC are various, and whether a bus structure or a ring structure is adopted, the internal communication modes are basically data sharing. The real-time performance of the PLC is required, the requirements of each slave station on the real-time performance are different, the requirements of different communication tasks of the same station on the real-time performance are also possibly different, and the real-time performance of the whole PLC meets the requirements that the real-time performance of each communication task of each slave station hung on a bus is ensured. Selecting an appropriate data transfer scheme has a significant effect on improving real-time performance, sending data requires a response to the response, which is much slower than a non-response service, requiring a connection and a response to the service, and broadcast communication is the fastest. Therefore, a single communication mode is simple to implement, but the real-time requirements of all the secondary stations cannot be met.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a PLC internal rapid scanning communication system which can improve the PLC data sharing efficiency and shorten the scanning period of a master station. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
The invention provides a PLC internal fast scanning communication system, comprising: the master station, a plurality of bottom plates under the master station and a plurality of slave stations under the bottom plates; the master station data and the slave station data both have priority attributes;
the base plate and a plurality of subordinate slave stations adopt parallel scanning, and transmit and receive data through full duplex connection;
The master station and the bottom plate form a communication ring network, and periodically perform cyclic data transmission;
If the bottom plate scans the low-priority secondary station data, uploading the low-priority secondary station data to the main station through cyclic data transmission; if the base plate scans the slave station data with high priority, uploading the slave station data with high priority to the master station through active transmission;
If the master station has the master station data with low priority, transmitting the master station data with low priority to the through bottom plate through cyclic data transmission; and if the master station has the master station data with high priority, the master station data with high priority is transmitted to the bottom plate through active transmission.
Further, the base plate allocates fixed-length transceiving buffers for a plurality of subordinate slave stations respectively, performs data interaction in a preset scanning period, and transmits 64 effective bytes when adopting a 5M baud rate, wherein the preset scanning period is 110us.
Further, the data of the secondary station is received and transmitted through a data message, and the data message contains type codes, data length and CRC check, wherein the type codes of the secondary stations are unique.
Further, the cyclic data transmission includes downlink data transmission and uplink data transmission.
Further, the downlink data transmission includes:
the master station initiates data transmission and transmits the master station data to the first layer of bottom plate; wherein, the master station data comprises a base plate sequence number and address information;
the first layer of base plate transmits the received main station data to the second layer of base plate, and the first layer of base plate acquires corresponding main station data according to the base plate sequence number in the main station data and fills the corresponding main station data into the transmission data;
The second layer of base plate transmits the received main station data to the third layer of base plate, and the second layer of base plate acquires corresponding main station data according to the base plate sequence number in the main station data and fills the corresponding main station data into the transmission data;
sequentially issuing until the master station data are issued to an nth layer of base plate, and acquiring corresponding master station data according to the base plate sequence number in the master station data by the nth layer of base plate, and filling the master station data into the transmission data;
and the downlink data transmission is completed, wherein the address is increased by 1 every time the downlink data passes through one layer of bottom plate.
Further, the downlink data transmission of the cyclic data transmission further includes: the backplane transmits the transmission data to a plurality of subordinate slaves.
Further, the uplink data transmission includes:
Initiating data transmission from the nth layer of bottom plate, and uploading the data of the subordinate slave stations of the nth layer of bottom plate to the nth-1 layer of bottom plate through a communication ring network;
The nth layer of bottom board uploads the data of the secondary station under the nth layer of bottom board and the data of the secondary station uploaded by the nth layer of bottom board to the nth layer of bottom board through a communication ring network;
Sequentially uploading the data of the secondary stations of all the bottom plates to a first layer of bottom plates, and uploading the data of the secondary stations subordinate to the first layer of bottom plates and the data of the secondary stations of all the bottom plates to a master station by the first layer of bottom plates;
the uplink data transmission is completed, wherein the address is unchanged when the uplink data passes through each layer of bottom plate.
Further, the method also comprises the step that the master station adopts address heartbeat to detect data transmission, and the method comprises the following steps:
The master station periodically transmits data to the first layer of base plate, the first layer of base plate adds 1 to address information as a base plate address after receiving the data, and transmits the data to the second layer of base plate;
after receiving the data, each bottom plate adds 1 to the address information as the address of the bottom plate, and transmits the data to the bottom plate of the next layer;
The nth layer of bottom plate transmits the local address back to the direction of the main station, and after all the bottom plates in the uplink direction receive data, the received non-0 address is subtracted by 1 and the bottom plate address is checked;
If the addresses are consistent, the background address is forwarded,
If not, the sending address is cleared to 0, indicating an error,
If the received address is 0, directly uploading; if the master station receives the 0 address, the master station indicates that the link has errors of the bottom plate address, and the master station performs circulating data transmission after recalibrating the address.
Further, the uploading of the high priority secondary station data to the primary station by active transmission includes:
The base plate detects whether data are being uploaded; the uploading data comprises uplink data transmission of cyclic data transmission and active transmission of other bottom plates;
If the data is not uploaded, the base plate uploads the slave station data with high priority to the base plate of the upper layer, and all the base plates are sequentially uploaded until the slave station data is uploaded to the master station through the base plate of the first layer;
if the data is uploaded, the base plate waits for the data to be uploaded, and then the slave station data with high priority is uploaded to the base plate of the upper layer, and all the base plates are sequentially uploaded until the slave station data is uploaded to the master station through the base plate of the first layer.
Further, when the data is uploaded by each base plate, the base plates only forward the data and do not process the data.
Further, the transmitting the master station data with high priority to the bottom plate through active transmission includes:
The master station transmits the master station data with high priority to the first layer of base plate, and each base plate transmits the master station data with high priority to the target base plate in sequence until the master station data with high priority reaches the target base plate, wherein each base plate only transmits the data.
Compared with the prior art, the PLC internal rapid scanning communication system provided by the embodiment of the invention has the beneficial effects that:
The invention comprises the following steps: the master station, a plurality of bottom plates under the master station and a plurality of slave stations under the bottom plates; the master station data and the slave station data both have priority attributes; the base plate and a plurality of subordinate slave stations adopt parallel scanning, and transmit and receive data through full duplex connection; the master station and the bottom plate form a communication ring network, and periodically perform cyclic data transmission; the invention can solve the problems of long scanning period and poor data transmission instantaneity of a single communication mode, adopts a parallel bidirectional bus in the same bottom plate and adopts a communication mode of a parallel master station serial mode between plates, improves the data sharing efficiency of the PLC and shortens the scanning period of the master station.
If the bottom plate scans the low-priority secondary station data, uploading the low-priority secondary station data to the main station through cyclic data transmission; if the base plate scans the slave station data with high priority, uploading the slave station data with high priority to the master station through active transmission; if the master station has the master station data with low priority, transmitting the master station data with low priority to the through bottom plate through cyclic data transmission; and if the master station has the master station data with high priority, the master station data with high priority is transmitted to the bottom plate through active transmission. The invention can realize the active transmission of high priority data between the base plate and the master station.
Drawings
Fig. 1 is a schematic structural diagram of a PLC internal fast scan communication system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a cyclic data transmission of a fast scan communication system within a PLC according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an active upload of a PLC internal fast scan communication system provided in an embodiment of the present invention;
FIG. 4 is a schematic diagram of an active issue of a fast scan communication system within a PLC according to an embodiment of the present invention;
Fig. 5 is a schematic diagram of address heartbeat detection data transmission adopted by a PLC internal fast scan communication system according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
As shown in fig. 1, a PLC internal fast scan communication system includes a master station 0, the master station has a plurality of bottom boards under the master station, namely a bottom board 1, a bottom board 2 and a bottom board 3, the bottom board has a plurality of sub-stations under the master station, the bottom board 1 has a sub-station 11, a sub-station 12 and a sub-station 13 under the bottom board 1, the bottom board 2 has a sub-station 21, a sub-station 22 and a sub-station 23 under the bottom board 2, and the bottom board 3 has a sub-station 31, a sub-station 32 and a sub-station 33 under the bottom board. Both the primary station data and the secondary station data have priority attributes.
The base plate 1 and the slave stations 11, 12 and 13 adopt a parallel scanning mode, the base plate 2 and the slave stations 21, 22 and 23 adopt a parallel scanning mode, the base plate 3 and the slave stations 31, 32 and 33 adopt a parallel scanning mode, and each base plate and the slave stations subordinate to the base plate adopt a receiving and transmitting full duplex connection to receive and transmit data in real time. The clock is extracted from the data by the receiving end, each slave station has a unique type code and a fixed data receiving and transmitting format, the data message contains data information such as type codes, data length and the like, the receiving and transmitting message is provided with CRC (cyclic redundancy check) to ensure reliable communication, and if the check fails, the data is not retransmitted, and the next scanning period is waited. Each base plate is respectively allocated with a fixed-length receiving and transmitting buffer memory for each subordinate slave station, data interaction is carried out in a preset scanning period, and 64 effective bytes are transmitted by adopting a 5M baud rate, wherein the preset scanning period is 110us.
The master station 0, the base plate 1, the base plate 2 and the base plate 3 form a communication ring network, and cycle data transmission is carried out periodically. If the bottom plate scans the low-priority secondary station data, uploading the low-priority secondary station data to the main station through cyclic data transmission; if the base plate scans the slave station data with high priority, uploading the slave station data with high priority to the master station through active transmission; if the master station has the master station data with low priority, transmitting the master station data with low priority to the bottom plate through cyclic data transmission; and if the master station has the master station data with high priority, the master station data with high priority is transmitted to the bottom plate through active transmission.
Cyclic data transmission, including downlink data transmission and uplink data transmission, is shown in fig. 2.
The downlink data transmission is a link for the master station 0 to issue data, and includes:
the master station 0 initiates data transmission and transmits the master station data to the bottom plate 1; wherein, the master station data comprises a base plate sequence number and address information;
The base plate 1 transmits the received main station data to the base plate 2, and the base plate 1 acquires corresponding main station data according to the base plate sequence number in the main station data and fills the corresponding main station data into the transmission data;
The base plate 2 transmits the received main station data to the base plate 3, and the base plate 2 acquires corresponding main station data according to the base plate sequence number in the main station data and fills the corresponding main station data into the transmission data; the base plate 3 acquires corresponding main station data according to the base plate sequence number in the main station data and fills the corresponding main station data into the transmission data;
and the downlink data transmission is completed, wherein the address is increased by 1 every time the downlink data passes through one layer of bottom plate.
Each backplane transmits the transmission data to each subordinate slave station.
Uplink data transmission is a link for uploading data to each base plate, and comprises:
initiating data transmission from the base plate 3, and uploading the data of the slave stations subordinate to the base plate 3 to the base plate 2 through a communication ring network;
the base plate 2 uploads the slave station data subordinate to the base plate 2 and the slave station data uploaded by the base plate 3 to the base plate 1 through a communication ring network; the base plate 1 uploads the data of the subordinate slave stations of the base plate 1, the data of the slave stations of the base plate 2 and the base plate 3 to the master station;
the uplink data transmission is completed, wherein the address is unchanged when the uplink data passes through each layer of bottom plate.
And each bottom plate only forwards the data sent to the main station, and does not process the data.
As shown in fig. 5, the master station 0 for cyclic data transmission detects data transmission using address heartbeat, including:
the master station 0 periodically transmits data to the base plate 1, the base plate 1 adds 1 to address information to serve as a base plate address after receiving the data, and the data is transmitted to the base plate 2;
after receiving the data, the base plate 2 adds 1 to the address information as a base plate address, and transmits the data to the base plate 3;
After receiving the data, the base plate 3 adds 1 to the address information to serve as a base plate address, the base plate 3 transmits the local address back to the main station direction, and after receiving the data, the base plate 2 and the base plate 1 in the uplink direction reduce the received non-0 address by 1 to verify the base plate address:
If the addresses are consistent, the background address is forwarded,
If not, the sending address is cleared to 0, indicating an error,
If the received address is 0, directly uploading; if the master station 0 receives the 0 address, the master station indicates that the link has errors of the bottom plate address, and the master station performs the cyclic data transmission after recalibrating the address.
As shown in fig. 3, if the base plate receives the high-priority slave station data, the high-priority slave station data is uploaded to the master station through the active transmission, and if the base plate 2 has the high-priority slave station data, the base plate 2 initiates the active data uploading. Comprising the following steps: the base plate 2 detects whether data is being uploaded; the uploading data comprises uplink data transmission of cyclic data transmission and active transmission of other bottom plates; if the data is not uploaded, the base plate uploads the slave station data with high priority to the base plate of the upper layer, and all the base plates are sequentially uploaded until the slave station data is uploaded to the master station through the base plate of the first layer; if the data is uploaded, the base plate waits for the data to be uploaded, and then the slave station data with high priority is uploaded to the base plate of the upper layer, and all the base plates are sequentially uploaded until the slave station data is uploaded to the master station through the base plate of the first layer. At this time, the other bottom boards only forward the data sent to the main station, and do not process the data, and the data is in a single-row direction.
As shown in fig. 4, if the master station 0 has high priority master station data to be transmitted to the base plate 3, the master station 0 may initiate an active data downloading, which includes: the master station 0 transmits the master station data with high priority to the bottom plate 1, the bottom plate 1 transmits the master station data with high priority to the bottom plate 2, the bottom plate 2 transmits the master station data with high priority to the bottom plate 3, wherein the bottom plate 1 and the bottom plate 2 only transmit data, and the data is in a single-row direction.
The address automatic detection supports hot plug and follow slave station change; the synchronous sampling can be realized by serial-parallel combination; the method can realize periodic data receiving and transmitting and also realize abrupt data transmission; the data priority can be configured, and the data with high priority has shorter delay.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (10)
1. A PLC internal fast scan communication system, comprising: the master station, a plurality of bottom plates under the master station and a plurality of slave stations under the bottom plates; the master station data and the slave station data both have priority attributes;
the base plate and a plurality of subordinate slave stations adopt parallel scanning, and transmit and receive data through full duplex connection;
The master station and the bottom plate form a communication ring network, and periodically perform cyclic data transmission;
If the bottom plate scans the low-priority secondary station data, uploading the low-priority secondary station data to the main station through cyclic data transmission; if the base plate scans the slave station data with high priority, uploading the slave station data with high priority to the master station through active transmission;
If the master station has the master station data with low priority, transmitting the master station data with low priority to the bottom plate through cyclic data transmission; and if the master station has the master station data with high priority, the master station data with high priority is transmitted to the bottom plate through active transmission.
2. The PLC internal fast scan communication system according to claim 1, wherein the backplane allocates fixed length transceiving buffers for a plurality of subordinate slaves, respectively, performs data interaction with a preset scan period, and transmits 64 valid bytes with a 5M baud rate, the preset scan period being 110us.
3. The PLC internal fast scan communication system according to claim 1, wherein the slave station data is transmitted and received by a data message, the data message including a type code, a data length, and a CRC check, wherein the type code of each slave station is unique.
4. The PLC internal fast scan communication system according to claim 1, wherein the cyclic data transmission includes a downlink data transmission and an uplink data transmission.
5. The PLC internal fast scan communication system according to claim 4, wherein the downstream data transmission comprises:
the master station initiates data transmission and transmits the master station data to the first layer of bottom plate; wherein, the master station data comprises a base plate sequence number and address information;
the first layer of base plate transmits the received main station data to the second layer of base plate, and the first layer of base plate acquires corresponding main station data according to the base plate sequence number in the main station data and fills the corresponding main station data into the transmission data;
The second layer of base plate transmits the received main station data to the third layer of base plate, and the second layer of base plate acquires corresponding main station data according to the base plate sequence number in the main station data and fills the corresponding main station data into the transmission data;
sequentially issuing until the master station data are issued to an nth layer of base plate, and acquiring corresponding master station data according to the base plate sequence number in the master station data by the nth layer of base plate, and filling the master station data into the transmission data;
and the downlink data transmission is completed, wherein the address is increased by 1 every time the downlink data passes through one layer of bottom plate.
6. The PLC internal fast scan communication system according to claim 4, wherein the upstream data transmission comprises:
Initiating data transmission from the nth layer of bottom plate, and uploading the data of the subordinate slave stations of the nth layer of bottom plate to the nth-1 layer of bottom plate through a communication ring network;
The nth layer of bottom board uploads the data of the secondary station under the nth layer of bottom board and the data of the secondary station uploaded by the nth layer of bottom board to the nth layer of bottom board through a communication ring network;
Sequentially uploading the data of the secondary stations of all the bottom plates to a first layer of bottom plates, and uploading the data of the secondary stations subordinate to the first layer of bottom plates and the data of the secondary stations of all the bottom plates to a master station by the first layer of bottom plates;
the uplink data transmission is completed, wherein the address is unchanged when the uplink data passes through each layer of bottom plate.
7. The PLC internal fast scan communication system of claim 4, further comprising a master station for detecting data transmissions using an address heartbeat, comprising:
The master station periodically transmits data to the first layer of base plate, the first layer of base plate adds 1 to address information as a base plate address after receiving the data, and transmits the data to the second layer of base plate;
after receiving the data, each bottom plate adds 1 to the address information as the address of the bottom plate, and transmits the data to the bottom plate of the next layer;
The nth layer of bottom plate transmits the local address back to the direction of the main station, and after all the bottom plates in the uplink direction receive data, the received non-0 address is subtracted by 1 and the bottom plate address is checked;
If the addresses are consistent, the background address is forwarded,
If not, the sending address is cleared to 0, indicating an error,
If the received address is 0, directly uploading; if the master station receives the 0 address, the master station indicates that the link has errors of the bottom plate address, and the master station performs circulating data transmission after recalibrating the address.
8. The PLC internal fast scan communication system according to claim 1, wherein the uploading of high priority secondary station data to the primary station via active transmission comprises:
The base plate detects whether data are being uploaded; the uploading data comprises uplink data transmission of cyclic data transmission and active transmission of other bottom plates;
If the data is not uploaded, the base plate uploads the slave station data with high priority to the base plate of the upper layer, and all the base plates are sequentially uploaded until the slave station data is uploaded to the master station through the base plate of the first layer;
if the data is uploaded, the base plate waits for the data to be uploaded, and then the slave station data with high priority is uploaded to the base plate of the upper layer, and all the base plates are sequentially uploaded until the slave station data is uploaded to the master station through the base plate of the first layer.
9. The PLC internal fast scan communication system according to claim 6 or 8, wherein when each backplane uploads data, each backplane performs only data forwarding without data processing.
10. The PLC internal fast scan communication system according to claim 1, wherein the issuing of high priority master station data to the backplane via active transmission comprises:
The master station transmits the master station data with high priority to the first layer of base plate, and each base plate transmits the master station data with high priority to the target base plate in sequence until the master station data with high priority reaches the target base plate, wherein each base plate only transmits the data.
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| CN105450489A (en) * | 2015-12-02 | 2016-03-30 | 大连理工计算机控制工程有限公司 | HEBus efficient fieldbus system for preferably realizing shortest message in output and communication method |
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| JPH0715445A (en) * | 1993-06-15 | 1995-01-17 | Toshiba Corp | Data transmission system |
| JPH0993270A (en) * | 1995-09-27 | 1997-04-04 | Toshiba Corp | Data transmission system |
| CN108769000B (en) * | 2018-05-24 | 2021-03-26 | 南京大学 | High-efficiency streaming media transmission method for deep space environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105450489A (en) * | 2015-12-02 | 2016-03-30 | 大连理工计算机控制工程有限公司 | HEBus efficient fieldbus system for preferably realizing shortest message in output and communication method |
Non-Patent Citations (1)
| Title |
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| PLC控制系统故障特性与诊断方法研究;刘延霞;《产业与科技论坛》;20211231;第20卷(第09期);全文 * |
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