CN201826830U - Logging device based on RS485 system data bus - Google Patents
Logging device based on RS485 system data bus Download PDFInfo
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- CN201826830U CN201826830U CN2010205562498U CN201020556249U CN201826830U CN 201826830 U CN201826830 U CN 201826830U CN 2010205562498 U CN2010205562498 U CN 2010205562498U CN 201020556249 U CN201020556249 U CN 201020556249U CN 201826830 U CN201826830 U CN 201826830U
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Abstract
The utility model discloses a logging device based on an RS485 system data bus, which belongs to the field of oil logging. In order to provide a highly efficient connecting and switching device, the technical scheme of the logging device based on an RS485 system data bus includes that a gateway board is connected with a data transmission decoding board by the aid of a high-speed channel of the RS485 system data bus, a medium-speed channel of the RS485 system data bus is utilized for commination between the gateway board and a depth board and between the gateway board and a channel board, a low-speed channel of the RS485 system data bus is utilized for communication between the gateway board and a cable switching box, between the gateway board and a power box and between the gateway board and a winch panel, the high-speed channel, the medium-speed channel and the low-speed channel are in master-slave mode communication, the gateway board serves as a master machine, and the other boards serve as slave machines. The logging device is mainly applied to communication between a ground signal and a downhole signal.
Description
Technical field
The utility model relates to the oil well logging field, is a kind of practical plan of ground logging system internal data bus.Specifically, relate to well logging apparatus based on the RS485 system data bus.
Background technology
Oil is the mainstay of economic development, and new oil reservoir is all actively being sought by each country in the world, and each oil-producing country is also making great efforts to improve each mouthful oil well yield by various technological means.Well logging is the important step in the oil exploitation engineering, and logging quality directly has influence on exploitation quality and oil productivity, and therefore logging technique also obtains fast development.
The ground system data/address bus is in an important status in logging system, be used for being responsible for the exchanges data between each link of ground system.This bus design whether reasonable determined the performance of whole logging system to a great extent.
Traditional ground logging system has adopted single data/address bus pattern., also be articulated on the same data/address bus the less demanding link of transfer of data for those.The drawback of doing like this is: influenced the communication efficiency between the high link of transmission rate request; Bus performance is required each different links, must increase cost according to the same standard design circuit.
Summary of the invention
For overcoming the deficiencies in the prior art, provide a kind of and connect efficiently and switching device shifter, the technical scheme that the utility model is taked is that the well logging apparatus based on the RS485 system data bus comprises:
1) power supply box: be used for powering to whole system;
2) cable a-b box: comprise a relay array, be used for outside cable core being switched to corresponding inner cable core and corresponding power supply being switched on the outside cable core;
3) winch panel: be positioned on the winch, show to comprise the degree of depth, the parameter of speed and cable tension;
4) vasculum: comprise the gateway plate, number passes decoding deck, degree of depth plate, channel plate;
The gateway plate communicates by Ethernet interface and main frame;
Number passes the decoding deck down-hole number that is used for decoding and passes the order of other instruments of collecting, and connects the gateway plate by 485 buses at a high speed;
Photoelectric coded disk signal under the degree of depth plate received well, and produce degree of depth driving signal;
The gateway plate passes decoding deck by RS485 system data bus high-speed channel linking number, and the communication between gateway plate and degree of depth plate, the channel plate takies RS485 system data bus middling speed passage; Gateway plate and cable a-b box, power supply box, the communication between the winch panel takies RS485 system data bus low speed passage; High, medium and low fast passage adopts master-slave mode communication, and the gateway plate is as main frame, and other plates are as slave.
Described RS485 bus comprises sending and receiving two transmission lines, is connected respectively a wink to press TVS between every transmission lines and ground, and wink is pressed the positive ending grounding of TVS.
Described RS485 bus comprises sending and receiving two transmission lines, and every transmission lines is provided with the current-limiting resistance of a serial connection.
The utility model possesses following technique effect:
Bus of the present utility model comprises high speed, middling speed, three passages of low speed.According to the characteristics of each link of system, be articulated on the different passages, improved the data transmission efficiency of whole bus, reduced cost;
This bus adopts the RS485 bus, and the RS485 interface is the standardization EBI that EIA releases, and adopts balanced type to send, and the data collector that differential type receives drives bus, has long transmission distance, and transmission node is many, and transmission cost is low, the circuit characteristic of simple.
Description of drawings
Fig. 1 is ground logging system data bus structure figure.
Fig. 2 is the circuit interface conceptual scheme.
Fig. 3 is a bus conceptual scheme altogether.
The specific embodiment
Bus of the present utility model comprises high speed, middling speed, three passages of low speed.According to the characteristics of each link of system, be articulated on the different passages.Improve the data transmission efficiency of whole bus, reduced cost.
This bus adopts the RS485 bus, and the RS485 interface is the standardization EBI that EIA releases, and adopts balanced type to send, and the data collector that differential type receives drives bus.Have long transmission distance, transmission node is many, and transmission cost is low, the circuit characteristic of simple.
The utility model EBI adopts 485 bus transceiver SN65HVD33 of TI company, and this chip adopts the 3.3V low-voltage power supply, can receive the 5V signal.This chip is supported full-duplex mode, and highest communication speed can reach 25Mbit/S, can be with 256 nodes.Bus pin has the esd protection above 15KV.
The traffic rate of high speed of the present utility model, middling speed, low speed passage is respectively 4M, 1M, 115.2K bit/S.It is high-speed channel that the gateway plate passes communicating by letter between the decoding deck with number.Communicating by letter between other channel plates of gateway plate and vasculum is the middling speed passage.Gateway plate and other casings comprise that the communication between the winch panel is the low speed passage.Communication adopt one main many from the half duplex communication pattern.
The utility model is described in further detail below in conjunction with accompanying drawing.
1. theory diagram
Fig. 1 is ground logging system data bus structure figure.Each several part is wherein done brief description.
1) power supply box: power supply box is used for powering to whole system.Comprise the power supply of each casing of ground, the power supply of downhole instrument and the backup of downhole instrument.Power supply box is uploaded to vasculum to each road power source voltage and the current information gathered by bus.
2) cable a-b box: comprise a relay array.Be used for outside cable core being switched to corresponding inner cable core and corresponding power supply being switched on the outside cable core.
3) winch panel: be positioned on the winch display depth, parameters such as speed and cable tension.For drumman is submitted necessary information.
4) vasculum: comprise the gateway plate, number passes decoding deck, degree of depth plate, channel plate etc.
The gateway plate communicates by Ethernet interface and main frame, by three groups of buses and other part swap datas.
Number passes the decoding deck down-hole number that is used for decoding and passes the order of other instruments of collecting, and uploads the gateway plate by 485 buses at a high speed.
Degree of depth plate receives the photoelectric coded disk signal, and produces the degree of depth driving signal of whole system.
As shown in Figure 1, the utility model has designed three groups of RS485 buses.Gateway plate and number pass the amount of communication data maximum between the decoding deck, take a high-speed channel.Communication between gateway plate and degree of depth plate and other channel plates thereof takies the middling speed passage.This passage decreases with respect to high-speed channel for the requirement of interface chip, helps the schematic design and the cost control of other channel plates.Gateway plate and cable a-b box, power supply box, the amount of communication data of winch panel is less, adopts the low speed passage.Each bus adopts master-slave mode communication, and the gateway plate is as main frame, and other plates are as slave.
2 circuit are realized
1) build-out resistor chooses
When signal runs into the very little even situation about not having of impedance suddenly in line end, will cause reflection.Eliminate the method for this reflection, just must make the impedance of transmission line continuous at terminal resistance onesize of terminal cross-over connection of transmission line with the characteristic impedance of transmission line.Because the transmission of signal is two-way, therefore, but at onesize terminal resistance of other end cross-over connection of transmission line.R2 is build-out resistor among Fig. 2, gets 120 ohm.
2) measure of removal bus reflections signal or interference
Than in higher, it is necessary placing biasing resistor on the line at communication baud rate, and its effect is after circuit enters idle condition, and the level of (idle mode) is not pulled away from 0 level when having data on the bus.So, even occurred smaller reflected signal or interference in the circuit, the data sink that is articulated on the bus can not produce malfunction owing to the arrival of these signals yet.
Shown in following table, the voltage of getting on the R2 gets final product during greater than 200 millivolts.Here choose biasing resistor R1, the R3 resistance is 680 ohm.
3) overcurrent protection measure
When some devices break down on the bus, might make the very big electric current of generation on the bus, thereby burn other sending devices.For fear of this situation, two current-limiting resistance R4 have been designed, R5.Value is 20 ohm.
4) removal of bus surge voltage
The low speed bus distance at winch panel place is longer, may be subjected to other interference sources and disturb.Designed in circuit by wink pressing TVS Z1, the absorption circuit that Z2 forms can effectively be protected chip.
5) system's scheme altogether
Though the RS485 EBI can suppress common mode disturbances effectively,, when common mode disturbances exceeds the scope of chip permission, just proper communication can not be realized, even interface chip can be damaged.The effective way that addresses this problem is that the ground with various piece connects together, as shown in Figure 3.
Claims (3)
1. the well logging apparatus based on the RS485 system data bus is characterized in that, comprising:
1) power supply box: be used for powering to whole system;
2) cable a-b box: comprise a relay array, be used for outside cable core being switched to corresponding inner cable core and corresponding power supply being switched on the outside cable core;
3) winch panel: be positioned on the winch, show to comprise the degree of depth, the parameter of speed and cable tension;
4) vasculum: comprise the gateway plate, number passes decoding deck, degree of depth plate, channel plate;
The gateway plate communicates by Ethernet interface and main frame;
Number passes the decoding deck down-hole number that is used for decoding and passes the order of other instruments of collecting, and connects the gateway plate by 485 buses at a high speed; Photoelectric coded disk signal under the degree of depth plate received well, and produce degree of depth driving signal;
The gateway plate passes decoding deck by RS485 system data bus high-speed channel linking number, and the communication between gateway plate and degree of depth plate, the channel plate takies RS485 system data bus middling speed passage; Gateway plate and cable a-b box, power supply box, the communication between the winch panel takies RS485 system data bus low speed passage; High, medium and low fast passage adopts master-slave mode communication, and the gateway plate is as main frame, and other plates are as slave.
2. a kind of well logging apparatus according to claim 1 based on the RS485 system data bus, it is characterized in that, described RS485 bus comprises sending and receiving two transmission lines, is connected respectively a wink to press TVS between every transmission lines and ground, and wink is pressed the positive ending grounding of TVS.
3. a kind of well logging apparatus based on the RS485 system data bus according to claim 1 is characterized in that described RS485 bus comprises sending and receiving two transmission lines, and every transmission lines is provided with the current-limiting resistance of a serial connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205562498U CN201826830U (en) | 2010-10-11 | 2010-10-11 | Logging device based on RS485 system data bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205562498U CN201826830U (en) | 2010-10-11 | 2010-10-11 | Logging device based on RS485 system data bus |
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| Publication Number | Publication Date |
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| CN201826830U true CN201826830U (en) | 2011-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010205562498U Expired - Fee Related CN201826830U (en) | 2010-10-11 | 2010-10-11 | Logging device based on RS485 system data bus |
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| CN (1) | CN201826830U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104261219A (en) * | 2014-09-19 | 2015-01-07 | 济南重工股份有限公司 | Sinking winch running speed and depth detection device |
| CN104471859A (en) * | 2012-05-21 | 2015-03-25 | 施耐德电气It公司 | Systems and methods for biasing a bus |
| CN104763413A (en) * | 2015-03-10 | 2015-07-08 | 中国海洋石油总公司 | Data bus, system and data transmission method for underground logging instruments |
| CN105626048A (en) * | 2016-03-25 | 2016-06-01 | 贵州天石能源科技有限公司 | Underground instrument multi-stage parallel-connection system used for oil well testing |
-
2010
- 2010-10-11 CN CN2010205562498U patent/CN201826830U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104471859A (en) * | 2012-05-21 | 2015-03-25 | 施耐德电气It公司 | Systems and methods for biasing a bus |
| US9984033B2 (en) | 2012-05-21 | 2018-05-29 | Schneider Electric It Corporation | Systems and methods for biasing a bus |
| CN104471859B (en) * | 2012-05-21 | 2018-10-19 | 施耐德电气It公司 | System and method for being biased to bus |
| CN104261219A (en) * | 2014-09-19 | 2015-01-07 | 济南重工股份有限公司 | Sinking winch running speed and depth detection device |
| CN104763413A (en) * | 2015-03-10 | 2015-07-08 | 中国海洋石油总公司 | Data bus, system and data transmission method for underground logging instruments |
| CN104763413B (en) * | 2015-03-10 | 2017-09-22 | 中国海洋石油总公司 | It is a kind of for the data/address bus of downhole logging instruments, system and data transmission method |
| CN105626048A (en) * | 2016-03-25 | 2016-06-01 | 贵州天石能源科技有限公司 | Underground instrument multi-stage parallel-connection system used for oil well testing |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110511 Termination date: 20131011 |