CN112037493A - DI switching value acquisition system and method based on wireless Lora - Google Patents
DI switching value acquisition system and method based on wireless Lora Download PDFInfo
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Abstract
The invention belongs to the technical field of wireless communication, and particularly relates to a DI switching value acquisition system and method based on wireless Lora, wherein the system comprises a DI switching value detection module, a Lora wireless communication module, a data acquisition terminal and a server connected with the data acquisition terminal; the DI switching value detection module comprises a plurality of switching value detection points; the Lora wireless communication module is used for realizing transparent transmission communication between the industrial personal computer and the serial port equipment; the data acquisition terminal is connected with the DI switching value detection module through the Lora wireless communication module and used for inquiring the on-off state of each channel of the DI switching value detection module; the invention combines the DI acquisition module to realize the acquisition of the state parameters of the start, stop, mode, movement direction and the like of the equipment, and carries out data transmission in a Lora wireless mode, thereby not only realizing the monitoring of the equipment state, but also saving the trouble of wiring.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a DI switching value acquisition system and method based on wireless Lora.
Background
At present, enterprises are advancing towards the direction of intelligent manufacturing of comprehensive informatization, but many small and medium-sized enterprises lack relevant talents due to the fact that the enterprises are affected by the fund problem, the information foundation is weak, the equipment networking rate is not high, and data acquisition is incomplete. Meanwhile, due to historical reasons, many enterprises develop and form various devices, various networks and complex application environments, and although the enterprise part realizes industrial automation and also has data acquisition conditions, a plurality of old devices still exist, and control systems of the old devices adopt components such as relays and contactors and do not have the data acquisition conditions. In addition, a vehicle needs to be driven in the air of a production workshop, a signal line is inconvenient to arrange from the space above the equipment, heavy objects such as a forklift are often passed on the ground, the arrangement of the signal line on the ground is very complicated, a slotted sleeve is needed, the production is influenced, the implementation period is long, and the cost is also high. Based on this reality, in order to solve the problem of data acquisition of old and old equipment in a factory, it is necessary to design a system and a method for acquiring DI switching values based on wireless Lora.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a wireless Lora-based DI switching value acquisition system and method, solves the problem that wiring is inconvenient in air and on the ground in a factory workshop, realizes state acquisition of old equipment, and meets the requirement of an MES system on equipment state monitoring.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a wireless Lora-based DI switching value acquisition system comprises a DI switching value detection module, a Lora wireless communication module, a data acquisition terminal and a server connected with the data acquisition terminal;
the DI switching value detection module comprises a plurality of switching value detection points and is used for detecting the operations of starting, stopping, fault states and the like of equipment;
the Lora wireless communication module supports low-frequency half-duplex serial port communication of a point-to-point communication protocol and is used for realizing transparent transmission communication between the industrial personal computer and the serial port equipment;
the data acquisition terminal is connected with the DI switching value detection module through the Lora wireless communication module and used for inquiring the on-off state of each channel of the DI switching value detection module.
Furthermore, the DI switching value detection module is connected with a dry contact signal or a wet contact signal, and is particularly suitable for a circuit controlled by a direct current relay, and the input can be a common cathode or common anode connection method; the polarity is automatically switched without jumper wires; the high signal level is 10-30V, the low level is 0-3V, and the sampling frequency can reach 100 Hz.
Further, the working frequency range of the Lora wireless communication module is 410-; the serial port is used for data receiving and transmitting, the threshold of wireless application is reduced, and one-to-one or one-to-many communication can be realized. LoRa has power density and concentrates, and the advantage that the interference killing feature is strong, and LoRa data transmission terminal communication distance can reach 8000m (open stadia, clear weather, antenna gain 5dBi, the height of placing the antenna is greater than 2m, the aerial speed of 0.268K).
Further, the conditions that the Lora wireless communication module and the industrial personal computer carry out point-to-point communication are as follows: the communication rate is the same, the channel is the same, and the address of the Lora wireless communication module is correct.
Further, the data acquisition terminal actively sends out an instruction to inquire the on-off state of each channel of the DI switching value detection module, and the DI switching value detection module returns the on-off state message of each channel to the data acquisition terminal after receiving the inquiry instruction of the data acquisition terminal; and after receiving the return message of the DI switching value detection module, the data acquisition terminal analyzes the on-off state of the DI switching value, judges the state of the equipment according to the actual wiring state of the DI switching value detection module and the equipment, and reports the equipment state message to the database.
Further, the wireless communication supports a Modbus communication protocol. The number of channels of the DI switching value detection module can reach more than 20; the data acquisition terminal is connected with a group of Lora wireless communication modules to form a master station; the other group of Lora wireless communication modules is connected with the DI switching value detection module to form a slave station; each slave station is connected with a plurality of devices to be detected.
The invention also provides another technical scheme that:
a wireless Lora-based DI switching value acquisition method comprises the following steps:
s1, connecting the data acquisition terminal with a group of Lora wireless communication modules to form a master station; connecting another group of Lora wireless communication modules with a DI switching value detection module to form a slave station; each slave station can be connected with a plurality of devices to be detected; one-to-many acquisition of the data acquisition terminal can be realized, and the acquisition cost is reduced;
s2, in each acquisition cycle, the data acquisition terminal actively sends out an instruction to inquire the on-off state of each channel of the DI switching value detection module, the header of the instruction needs to be consistent with the address of the Lora wireless communication module of the equipment to be inquired, and the DI switching value detection module returns the current on-off information message of the DI switching value to the acquisition terminal;
and S3, the industrial personal computer judges the state of each channel of the equipment to be detected through message conversion according to the actual wiring condition of the DI switching value detection module and the equipment to be detected, and reports the equipment state message to the database of the server.
Compared with the prior art, the invention has the following advantages: the invention combines the DI acquisition module to realize the acquisition of the state parameters of the start, stop, mode, movement direction and the like of the equipment, and carries out data transmission in a Lora wireless mode, thereby not only realizing the monitoring of the equipment state, but also saving the trouble of wiring, saving the cost, avoiding rewiring when the equipment is shifted and being convenient for construction.
Drawings
FIG. 1 is a block diagram of the present invention;
fig. 2 is a schematic diagram of a connection between a DI switching value detection module and a device to be detected in embodiment 1 of the present invention;
fig. 3 is a schematic view of communication between the industrial control machine and the Lora wireless communication module in embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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.
Example 1:
as shown in fig. 1, the wireless Lora-based DI switching value acquisition system of this embodiment includes a DI switching value detection module, an Lora wireless communication module, a data acquisition terminal, and a server connected to the data acquisition terminal.
The DI switching value detection module comprises a plurality of switching value detection points and is used for detecting the operations of starting, stopping, fault states and the like of equipment;
specifically, the DI switching value detection module is connected with a dry contact or wet contact signal, and is particularly suitable for a circuit controlled by a direct current relay, and the input is a common cathode or common anode connection method; as shown in fig. 2, from left to right, the following are in sequence: active (wet joint) common anode input, active (wet joint) common cathode input and passive (dry joint) input; the polarity is automatically switched without jumper wires; the high signal level is 10-30V, the low level is 0-3V, and the sampling frequency can reach 100 Hz. As shown in fig. 3, by connecting the state relay of the device to be tested with the DI switching value detection module, the state information of the device can be acquired through the DI switching value detection module.
The Lora wireless communication module supports low-frequency half-duplex serial port communication of a point-to-point communication protocol and is used for realizing transparent transmission communication between the industrial personal computer and the serial port equipment;
specifically, the working frequency range of the Lora wireless communication module is 410-; the serial port is used for data receiving and transmitting, the threshold of wireless application is reduced, and one-to-one or one-to-many communication can be realized. The LoRa has the advantages of concentrated power density and strong anti-interference capability, and the communication distance of the LoRa data transmission terminal can reach 8000m (open visual range, clear weather, antenna gain of 5dBi, antenna placement height of more than 2m and 0.268K air speed); when the Lora wireless communication modules carry out point-to-point communication, the same communication speed and the same channel are set with the Lora of the industrial personal computer, and one industrial personal computer can correspond to a plurality of Lora wireless communication modules. When the Lora wireless communication module communicates, all the points can receive information, but only when the sent instruction contains a correct address, the corresponding module can reach the message.
The data acquisition terminal is connected with the DI switching value detection module through the Lora wireless communication module and used for inquiring the on-off state of each channel of the DI switching value detection module;
specifically, the data acquisition terminal actively sends out an instruction to inquire the on-off state of each channel of the DI switching value detection module, and the DI switching value detection module returns the on-off state message of each channel to the data acquisition terminal after receiving the inquiry instruction of the data acquisition terminal; and after receiving the return message of the DI switching value detection module, the data acquisition terminal analyzes the on-off state of the DI switching value, judges the state of the equipment according to the actual wiring state of the DI switching value detection module and the equipment, and reports the equipment state message to the database.
The wireless communication described in this embodiment supports the Modbus communication protocol. The number of channels of the DI switching value detection module can reach more than 20; the data acquisition terminal is connected with a group of Lora wireless communication modules to form a master station; the other group of Lora wireless communication modules is connected with the DI switching value detection module to form a slave station; each slave station is connected with a plurality of devices to be detected.
The wireless Lora module plays a role in transparent transmission, has no substantial influence on messages, but because the Lora modules are used in pairs, communication parameters of a sending end and a receiving end of the wireless Lora module, addresses of the modules, master and slave machines, communication frequency bands and other parameters need to be set in advance and are consistent. Before the industrial personal computer and the Lora wireless communication module communicate, the industrial personal computer and the Lora wireless communication module need to be set firstly, the communication rates of the industrial personal computer and the Lora wireless communication module need to be set to be the same, communication channels need to be set to be the same, and Lora addresses under the same channel cannot be the same.
In the following description, taking the Lora address of the wireless Lora module as 0x0A and the Modbus address defaults to 0x01 as an example to obtain the status of the device, the industrial personal computer may send the following command (16 system):
0A 01 02 00 00 00 14 78 05
the message is parsed as follows:
addresses of 0A// Lora modules
01// module ground modbus address
02// module query instruction
0000// start address of query address
0014// number of bits queried
7805// CRC check
After receiving the message normally, the wireless Lora module returns the following message to the industrial personal computer:
01 02 03 01 00 00 29 8E
the message is parsed as follows:
01// station address
02// query instruction
03// return value byte count
01// represents the values of DI 0-DI 7 channels, and after the values are converted into binary system, the corresponding bit value is 1 when the channel is connected
00// represents the values of DI 8-DI 15 channels, and after the values are converted into binary system, the corresponding bit value is 1 when the channel is connected
00// represents the values of DI 6-DI 19 channels, and after the values are converted into binary system, the corresponding bit value is 1 when the channel is connected
29 8E//CRC
The invention can judge the state and operation of the equipment connected with the wireless Lora module through the values of DI 0-DI 19.
The invention gives consideration to the condition that the old equipment of the factory does not have data acquisition communication, realizes the state acquisition of the old equipment, meets the requirement of an MES system on the equipment state monitoring, simultaneously takes the actual situation that the air in the factory workshop and the ground are inconvenient to wire into account, uses the Lora wireless transmission mode, reduces the construction period and also reduces the construction cost.
The DI switching value acquisition method based on wireless Lora comprises the following steps:
s1, connecting the data acquisition terminal with a group of Lora wireless communication modules to form a master station; connecting another group of Lora wireless communication modules with a DI switching value detection module to form a slave station; each slave station can be connected with a plurality of devices to be detected. One-to-many acquisition of the data acquisition terminal can be realized, and the acquisition cost is reduced;
s2, in each acquisition cycle, the data acquisition terminal actively sends out an instruction to inquire the on-off state of each channel of the DI switching value detection module, the header of the instruction needs to be consistent with the address of the Lora wireless communication module of the equipment to be inquired, and the DI switching value detection module returns the current on-off information message of the DI switching value to the acquisition terminal;
and S3, the industrial personal computer judges the state of each channel of the equipment to be detected through message conversion according to the actual wiring condition of the DI switching value detection module and the equipment to be detected, and reports the equipment state message to the database of the server.
The above embodiments are only specific examples of the present invention, and the protection scope of the present invention includes but is not limited to the product forms and styles of the above embodiments, and any suitable changes or modifications made by those skilled in the art according to the claims of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a DI switching value collection system based on wireless Lora which characterized in that: the system comprises a DI switching value detection module, a Lora wireless communication module, a data acquisition terminal and a server connected with the data acquisition terminal;
the DI switching value detection module comprises a plurality of switching value detection points and is used for detecting the starting, stopping and fault states of equipment;
the Lora wireless communication module supports low-frequency half-duplex serial port communication of a point-to-point communication protocol and is used for realizing transparent transmission communication between the industrial personal computer and the serial port equipment;
the data acquisition terminal is connected with the DI switching value detection module through the Lora wireless communication module and used for inquiring the on-off state of each channel of the DI switching value detection module.
2. The wireless Lora-based DI switching value acquisition system according to claim 1, wherein: the data acquisition terminal is connected with a group of Lora wireless communication modules to form a master station; the other group of Lora wireless communication modules is connected with the DI switching value detection module to form a slave station; each slave station is connected with a plurality of devices to be detected.
3. The wireless Lora-based DI switching value acquisition system according to claim 1, wherein: the DI switching value detection module is connected with a dry contact signal or a wet contact signal, and the input is a common cathode or common anode connection method.
4. The wireless Lora-based DI switching value acquisition system according to claim 1, wherein: the DI switching value detection module has a high signal level of 10-30V and a low signal level of 0-3V, and the sampling frequency reaches 100 Hz.
5. The wireless Lora-based DI switching value acquisition system according to claim 1, wherein: the working frequency band of the Lora wireless communication module is 410-441 Mhz.
6. The wireless Lora-based DI switching value acquisition system according to claim 1, wherein: the conditions that the Lora wireless communication module and the industrial personal computer carry out point-to-point communication are as follows: the communication rate is the same, the channel is the same, and the address of the Lora wireless communication module is correct.
7. The wireless Lora-based DI switching value acquisition system according to claim 1, wherein: the data acquisition terminal actively sends out an instruction to inquire the on-off state of each channel of the DI switching value detection module, and the DI switching value detection module returns the on-off state message of each channel to the data acquisition terminal after receiving the inquiry instruction of the data acquisition terminal; and after receiving the return message of the DI switching value detection module, the data acquisition terminal analyzes the on-off state of the DI switching value, judges the state of the equipment according to the actual wiring state of the DI switching value detection module and the equipment, and reports the equipment state message to the database.
8. The wireless Lora-based DI switching value acquisition system according to claim 1, wherein: the wireless communication supports a Modbus communication protocol.
9. The wireless Lora-based DI switching value acquisition system according to claim 1, wherein: the number of channels of the DI switching value detection module is more than 20.
10. A DI switching value acquisition method based on wireless Lora is characterized in that: the wireless Lora-based DI switching value acquisition system as claimed in any one of claims 1-9, comprising:
s1, connecting the data acquisition terminal with a group of Lora wireless communication modules to form a master station; connecting another group of Lora wireless communication modules with a DI switching value detection module to form a slave station; each slave station can be connected with a plurality of devices to be detected;
s2, in each acquisition cycle, the data acquisition terminal actively sends out an instruction to inquire the on-off state of each channel of the DI switching value detection module, the header of the instruction needs to be consistent with the address of the Lora wireless communication module of the equipment to be inquired, and the DI switching value detection module returns the current on-off information message of the DI switching value to the acquisition terminal;
and S3, the industrial personal computer judges the state of each channel of the equipment to be detected through message conversion according to the actual wiring condition of the DI switching value detection module and the equipment to be detected, and reports the equipment state message to the database of the server.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115148014A (en) * | 2022-06-16 | 2022-10-04 | 武汉大小马物联科技有限公司 | Remote point-to-point wireless pair switching value controller |
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| CN207380507U (en) * | 2017-11-07 | 2018-05-18 | 杭州轨物科技有限公司 | Wireless modbus concentrators based on LoRa technologies |
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| CN109975638A (en) * | 2019-04-23 | 2019-07-05 | 成都绎码科技有限公司 | A kind of on-off model monitoring device and method based on wireless transmission |
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Application publication date: 20201204 |