CN111311899A - Water quality online monitoring data transmission system and method with multi-master and multi-slave structure - Google Patents
Water quality online monitoring data transmission system and method with multi-master and multi-slave structure Download PDFInfo
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- CN111311899A CN111311899A CN202010217590.9A CN202010217590A CN111311899A CN 111311899 A CN111311899 A CN 111311899A CN 202010217590 A CN202010217590 A CN 202010217590A CN 111311899 A CN111311899 A CN 111311899A
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
Abstract
The invention discloses a water quality on-line monitoring data transmission system and method with a multi-master and multi-slave structure, which comprises a data acquisition instrument connected with an upper computer of an environmental protection department and a local PLC connected with an upper computer of a sewage plant; the data acquisition instrument and the local PLC are connected to the intelligent data distributor through the RS485 communication module, and the intelligent data distributor is connected with a plurality of monitoring instruments through the RS485 communication module. The invention constructs different RS485 networks by matching and installing the logic controller LOGICAL with the intelligent data distributor and in a time-sharing polling mode, thereby integrally completing the multi-master and multi-slave communication function of the RS485 and realizing the consistency of data acquisition of the data acquisition instrument of the environmental protection department and the local PLC of the sewage plant under the condition of completely meeting the requirements of the data transmission standard of the on-line automatic monitoring (monitoring) system of pollutants (HJ 212-2017).
Description
Technical Field
The invention relates to the technical field of water quality analysis of sewage plants, in particular to a multi-master multi-slave structure water quality on-line monitoring data transmission system and method.
Background
The access mode of the water quality analyzer of the existing sewage plant is as follows: as shown in FIG. 1, in AI 4-20mA mode: the 4-20mA signal output by the water quality analyzer is connected into a signal isolator with one input and two outputs, and two paths of output signals of the signal isolator are sent to a data acquisition instrument of an environmental protection department and one path is sent to a PLC of a sewage plant. Wherein, the water quality analyzer is connected with the data acquisition instrument through a communication port (RS485), and the 4-20mA analog quantity output of the water quality analyzer is connected with the PLC, as shown in figure 2.
The problem that current sewage plant water quality analyzer's access mode exists:
1. when the output signals of the water quality analyzer are isolated and then are respectively sent to the data acquisition instrument and the sewage plant PLC in a one-in two-out mode, due to the influence of conversion precision during analog quantity conversion, the data of the water quality analyzer acquired by an environmental protection department and the data of the water quality analyzer acquired by the sewage plant have larger errors, particularly, the display numerical value of the current flowmeter, the display numerical value of the plant PLC and the display numerical value of the environmental protection department door data acquisition instrument are different when the flow of inlet and outlet water main pipes is acquired, and the cumulant of the water acquired by the environmental protection department and the cumulant acquired by the sewage plant can form a quite large difference through the accumulation of the water flow during the year-over-month accumulation.
2. The water quality analyzer is connected into the data acquisition instrument in an RS485 mode, and is connected into the PLC in a 4-20mA mode, so that an environmental protection department can obtain accurate numerical values, but the numerical value of the PLC of the sewage plant and the numerical value of the data acquisition instrument have large errors.
3. According to the requirements of the data transmission standard of the online automatic monitoring (monitoring) system for pollutants (HJ212-2017), an on-site monitoring (monitoring) instrument and meter are connected to a data acquisition instrument in two ways: (1) analog quantity is 4-20mA, and (2) digital communication (network mode: RS485/RS232) is adopted, according to the requirement of (HJ212-2017), when AI 4-20mA is adopted, the precision requirement of an environmental protection department cannot be met, and when the RS485 communication mode is adopted, the RS485 network cannot meet the requirement that a data acquisition instrument and a sewage plant PLC simultaneously acquire water quality analyzer signals.
To sum up, in the actual use, the not satisfied precision requirement of analog quantity transmission, data communication must adopt the RS485 mode, because the RS485 network belongs to the structure of a owner many slaves, if PLC and data acquisition appearance gather water quality analyzer data simultaneously, has just become many owner many slaves structure, consequently adopts the RS485 network can not satisfy the actual user demand.
Disclosure of Invention
The invention aims to provide a multi-master multi-slave structure water quality on-line monitoring data transmission system and a method, which solve the problem that a data acquisition instrument of an environmental protection department and a PLC of a sewage plant simultaneously acquire data of a water quality analyzer in an RS485 network communication mode.
In order to achieve the purpose, the invention provides the following technical scheme:
a water quality on-line monitoring data transmission system with a multi-master and multi-slave structure comprises an environment protection department upper computer and a sewage plant upper computer, wherein the environment protection department upper computer is correspondingly connected with a data acquisition instrument through a transmission network, and the sewage plant upper computer is correspondingly connected with a local PLC through the transmission network; the data acquisition instrument and the local PLC are connected to the intelligent data distributor through the RS485 communication module, and the intelligent data distributor is connected with the monitoring instruments through the RS485 communication module.
Furthermore, the intelligent data distributor comprises a master port and a slave port, wherein the master port M1 and the master port M2.
Furthermore, the n LOGIC switches are controlled by the LOGIC controller LOGIC, the LOGIC switch S1 is turned on, the LOGIC switch S2.... Sn is turned off, the master station MAIN1 is connected to the slave station port C through the M1 port of the intelligent data distributor and the LOGIC switch S1, and forms an RS485 network with the slave stations clamp 1 and clamp 2.... clamp, and the master station MAIN1 collects data from the slave stations.
Further, under the control of the logic controller logic, the logic switch S1 is opened, the logic switch S2 is closed, the logic switch S3.... Sn is opened, the master station MAIN2 forms a master-slave RS485 network with the slave stations clamp 1 and clamp 2.... clamp through the logic switch S2 and the slave station ports C, and the master station MAIN2 collects data from the slave stations.
Furthermore, the master station MAIN3.. 9.. the MAIN is the same as the master station MAIN2 in control mode, and respectively forms an RS485 network with each slave station, reads data from each slave station, returns to the master station MAIN1 to communicate with each slave station after the data is read by the master station MAIN and the slave station CLAVEn, and forms a communication function of an RS485 multi-master and multi-slave structure in a time-sharing polling mode.
The invention provides another technical scheme: a water quality on-line monitoring data transmission method with a multi-master and multi-slave structure comprises the following steps:
step 1): the water quality is monitored on line through a plurality of monitoring instruments, and monitoring data are transmitted to the intelligent data distributor through the RS485 communication module;
step 2): under the control of a LOGIC controller LOGIC, a LOGIC switch S1 is switched on, a LOGIC switch S2.. once.Sn is switched off, a master station MAIN1 is connected to a slave station port C through an intelligent data distributor M1 port and a LOGIC switch S1, and forms an existing RS485 network with each slave station CLAVE1 and CLAVE2.. once.CLAVEN, so that data acquisition of each slave station by the master station MAIN1 is completed;
step 3): after the master station finishes data acquisition of the slave stations CLAVEN, under the control of a logic controller LOGICAL, a logic switch S1 is switched off, a logic switch S2 is switched on, the logic switch S3.. once.Sn is kept in a disconnected state, the master station MAIN2 forms a master-slave RS485 network with the slave stations CLAVE1 and CLAVE2.. once.CLAVEN through the logic switch S2 and the slave station ports C, and the master station MAIN2 acquires data from the slave stations;
step 4): repeating the step 2) -the step 3), wherein the MAIN station MAINn 3...... the MAINn respectively forms a typical RS485 network with each slave station, reads data from each slave station, returns to the MAIN station MAIN1 to communicate with each slave station after the data are read by the MAIN station MAINn and the slave station CLAVEN, and repeats the steps, forms different RS485 networks through a time-sharing polling mode, and integrally completes the communication function of multiple RS485 masters and multiple slave stations;
step 5): the intelligent data distributor respectively establishes data communication transmission with the data acquisition instrument and the local PLC through a multi-master multi-slave communication structure of RS 485;
step 6): the data acquisition instrument transmits acquired data to an upper computer of an environmental protection department through a transmission network, and the local PLC transmits the acquired data to an upper computer of a sewage plant through the transmission network.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a water quality on-line monitoring data transmission system with a multi-master and multi-slave structure and a method thereof, which solve the problem of data inconsistency between an environmental protection department and a sewage plant.
2. According to the water quality on-line monitoring data transmission system and method with the multi-master and multi-slave structure, which are provided by the invention, the environment-friendly department and the sewage plant can acquire water quality data and also can acquire related information such as the setting and working state of each analyzer through RS485 network connection.
3. The water quality on-line monitoring data transmission system and method with the multi-master and multi-slave structure, provided by the invention, simplify the access mode and reduce the total amount of connecting cables and construction.
4. The water quality on-line monitoring data transmission system and method with the multi-master and multi-slave structure provided by the invention have the advantages that the number of PLC (programmable logic controller) and I/O (input/output) modules required by a water quality analyzer is eliminated.
Drawings
FIG. 1 is a wiring diagram of a prior art power distribution isolator;
FIG. 2 is a wiring diagram of a water quality analyzer of the prior art;
FIG. 3 is a network configuration diagram of an on-line monitoring room for inlet and outlet water of a sewage plant according to the present invention;
FIG. 4 is a logical wiring diagram of the intelligent data distributor of the present invention;
FIG. 5 is a LOGIC controller LOGIC flow diagram of the present invention;
FIG. 6 is a timing diagram of the main port of the intelligent data distributor according to the present invention.
In the figure: 1. an upper computer of an environmental protection department; 2. an upper computer of the sewage plant; 3. a data acquisition instrument; 4. a local PLC; 5. an intelligent data distributor; 6. the instrument is monitored.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 3, the system for transmitting the water quality online monitoring data with the multi-master and multi-slave structure comprises an environment protection department upper computer 1 and a sewage plant upper computer 2, wherein the environment protection department upper computer 1 is correspondingly connected with a data acquisition instrument 3 through a transmission network, and the sewage plant upper computer 2 is correspondingly connected with a local PLC4 through the transmission network; the data acquisition instrument 3 and the local PLC4 are connected to the intelligent data distributor 5 through an RS485 communication module, and the intelligent data distributor 5 is connected to the plurality of monitoring instruments 6 through the RS485 communication module.
Referring to fig. 4, in the above embodiment, the intelligent data distributor 5 includes two kinds of ports, i.e., a master port M1 and a slave port M2.. eta.mn connected to the master station, a slave port C connected to the slave station, a master station MAIN1 connected to the M1 port, a master station MAIN2 connected to the M2 port.. eta. 1 connected to the Mn port, and n logic switches, i.e., S1 and S2.. eta.sn, are disposed between the master station and the slave station.
Referring to fig. 5, in the above embodiment, n LOGIC switches are controlled by the LOGIC controller LOGIC, the LOGIC switch S1 is turned on, the LOGIC switch S2.... Sn is turned off, the master station MAIN1 is connected to the slave station port C through the M1 port of the intelligent data distributor 5 and the LOGIC switch S1, and forms an RS485 network with the slave stations clamp 1 and clamp 2.... clamp, and the master station MAIN1 collects data from the slave stations.
In the above embodiment, under the control of the logic controller logic, the logic switch S1 is opened, the logic switch S2 is closed, the logic switch S3.... Sn is opened, the master station MAIN2 forms a master-slave RS485 network with the slave stations clamp 1 and clamp 2.... clamp through the logic switch S2 and the slave station port C, and the master station MAIN2 collects data from the slave stations.
Referring to fig. 6, in the above embodiment, the master station MAIN 3......... a MAIN is the same as the master station MAIN2 in control mode, and forms an RS485 network with each slave station respectively, reads data from each slave station, returns to the master station MAIN1 to communicate with each slave station after the master station MAIN and the slave station CLAVEn have read the data, and forms a communication function of an RS485 multi-master multi-slave structure through a time-sharing polling mode.
To further better illustrate the present invention, an embodiment is also provided: a water quality on-line monitoring data transmission method with a multi-master and multi-slave structure comprises the following steps:
the method comprises the following steps: the water quality is monitored on line through a plurality of monitoring instruments 6, and monitoring data are transmitted to the intelligent data distributor 5 through an RS485 communication module;
step two: under the control of a LOGIC controller LOGIC, the intelligent data distributor 5 is controlled by a LOGIC controller LOGIC, a LOGIC switch S1 is switched on, a LOGIC switch S2.... Sn is switched off, a master station MAIN1 is connected to a slave station port C through an intelligent data distributor 5M1 port and a LOGIC switch S1, and forms an existing RS485 network together with each slave station CLAVE1 and CLAVE2...... CLAVE to finish the data acquisition of each slave station by the master station MAIN 1;
step three: after the master station finishes data acquisition of the slave stations CLAVEN, under the control of a logic controller LOGICAL, a logic switch S1 is switched off, a logic switch S2 is switched on, the logic switch S3.. once.Sn is kept in a disconnected state, the master station MAIN2 forms a master-slave RS485 network with the slave stations CLAVE1 and CLAVE2.. once.CLAVEN through the logic switch S2 and the slave station ports C, and the master station MAIN2 acquires data from the slave stations;
step four: repeating the second step, the third step, wherein the MAIN station MAINn 3......... MAINn respectively forms a typical RS485 network with each slave station, reads data from each slave station, returns to the MAIN station MAIN1 to communicate with each slave station after the MAIN station MAINn and the slave station CLAVEN read the data, repeats the steps, constructs different RS485 networks in a time-sharing polling mode, and integrally completes the multi-master and multi-slave communication function of the RS 485;
step five: the intelligent data distributor 5 establishes data communication transmission with the data acquisition instrument 3 and the local PLC4 through a multi-master multi-slave communication structure of RS485 respectively;
step six: the data acquisition instrument 3 transmits the acquired data to the upper computer 1 of the environmental protection department through a transmission network, and the local PLC4 transmits the acquired data to the upper computer 2 of the sewage plant through the transmission network.
In summary, the following steps: the invention provides a water quality on-line monitoring data transmission system and method with a multi-master and multi-slave structure, which are characterized in that a logic controller LOGICAL is installed by matching an intelligent data distributor 5, different RS485 networks are constructed by a time-sharing polling mode, the RS485 multi-master and multi-slave communication function is integrally completed, 6 isolators, 1 24V direct-current power supply, related power supplies and the like in the traditional mode are reduced, and the consistency of data acquisition of a data acquisition instrument 3 of an environmental protection department and the local PLC4 of a sewage plant is realized under the condition of completely meeting the requirements of the pollutant on-line automatic monitoring system data transmission standard (HJ 212-2017).
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (6)
1. A water quality on-line monitoring data transmission system with a multi-master and multi-slave structure comprises an environment protection department upper computer (1) and a sewage plant upper computer (2), wherein the environment protection department upper computer (1) is correspondingly connected with a data acquisition instrument (3) through a transmission network, and the sewage plant upper computer (2) is correspondingly connected with a local PLC (4) through the transmission network; the intelligent data acquisition system is characterized in that the data acquisition instrument (3) and the local PLC (4) are connected to the intelligent data distributor (5) through an RS485 communication module, and the intelligent data distributor (5) is connected with a plurality of monitoring instruments (6) through the RS485 communication module.
2. The system for on-line monitoring and data transmission of water quality of a multi-master multi-slave structure as claimed in claim 1, wherein: the intelligent data distributor (5) comprises a master port and a slave port, wherein the master port M1 and the master port M2.
3. The system for on-line monitoring and data transmission of water quality of a multi-master multi-slave structure as claimed in claim 2, wherein: the n LOGIC switches are controlled by a LOGIC controller LOGIC, the LOGIC switch S1 is connected, the LOGIC switch S2.... Sn is disconnected, the master station MAIN1 is connected to the slave station port C through an M1 port and the LOGIC switch S1 of the intelligent data distributor (5), and forms an RS485 network with the slave stations CLAVE1 and CLAVE2.... CLAVE, and the master station MAIN1 collects data from the slave stations.
4. The system for on-line monitoring and data transmission of water quality of a multi-master multi-slave structure as claimed in claim 3, wherein: under the control of the logic controller logic, the logic switch S1 is opened, the logic switch S2 is closed, the logic switch S3.... Sn is opened, the master station MAIN2 forms a master-slave RS485 network with the slave stations clamp 1 and clamp 2.... clamp through the logic switch S2 and the slave station port C, and the master station MAIN2 collects data from the slave stations.
5. The system for on-line monitoring and data transmission of water quality of a multi-master multi-slave structure as claimed in claim 4, wherein: the MAIN station MAIN3.. to the MAIN station MAIN2 has the same control mode, and respectively forms an RS485 network with each slave station, reads data from each slave station, returns to the MAIN station MAIN1 to communicate with each slave station after the data are read by the MAIN station MAIN and the slave station CLAVEn, and forms a communication function of an RS485 multi-master-slave structure through a time-sharing polling mode.
6. A water quality on-line monitoring data transmission method of a multi-master multi-slave structure as claimed in claim 1, characterized by comprising the following steps:
step 1): the water quality is monitored on line through a plurality of monitoring instruments (6), and monitoring data are transmitted to the intelligent data distributor (5) through the RS485 communication module;
step 2): under the control of a LOGIC controller LOGIC, a LOGIC switch S1 is switched on, a LOGIC switch S2.. once.Sn is switched off, and a master station MAIN1 is connected to a slave station port C through an M1 port and the LOGIC switch S1 of the intelligent data distributor (5), forms an existing RS485 network together with each slave station CLAVE1 and CLAVE2.. once.CLAVE and completes data acquisition of each slave station by a master station MAIN 1;
step 3): after the master station finishes data acquisition of the slave stations CLAVEN, under the control of a logic controller LOGICAL, a logic switch S1 is switched off, a logic switch S2 is switched on, the logic switch S3.. once.Sn is kept in a disconnected state, the master station MAIN2 forms a master-slave RS485 network with the slave stations CLAVE1 and CLAVE2.. once.CLAVEN through the logic switch S2 and the slave station ports C, and the master station MAIN2 acquires data from the slave stations;
step 4): repeating the step 2) -the step 3), wherein the MAIN station MAINn 3...... the MAINn respectively forms a typical RS485 network with each slave station, reads data from each slave station, returns to the MAIN station MAIN1 to communicate with each slave station after the data are read by the MAIN station MAINn and the slave station CLAVEN, and repeats the steps, forms different RS485 networks through a time-sharing polling mode, and integrally completes the communication function of multiple RS485 masters and multiple slave stations;
step 5): the intelligent data distributor (5) respectively establishes data communication transmission with the data acquisition instrument (3) and the local PLC (4) through a multi-master multi-slave communication structure of RS 485;
step 6): the data acquisition instrument (3) transmits acquired data to the upper computer (1) of the environmental protection department through a transmission network, and the local PLC (4) transmits the acquired data to the upper computer (2) of the sewage plant through the transmission network.
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| CN202010217590.9A CN111311899A (en) | 2020-03-25 | 2020-03-25 | Water quality online monitoring data transmission system and method with multi-master and multi-slave structure |
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| CN202010217590.9A CN111311899A (en) | 2020-03-25 | 2020-03-25 | Water quality online monitoring data transmission system and method with multi-master and multi-slave structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115629588A (en) * | 2022-12-19 | 2023-01-20 | 北京安帝科技有限公司 | Signal acquisition method, device and computer readable medium for industrial control network |
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