CN102054330A - Embedded disaster monitoring device - Google Patents
Embedded disaster monitoring device Download PDFInfo
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- CN102054330A CN102054330A CN 201010570925 CN201010570925A CN102054330A CN 102054330 A CN102054330 A CN 102054330A CN 201010570925 CN201010570925 CN 201010570925 CN 201010570925 A CN201010570925 A CN 201010570925A CN 102054330 A CN102054330 A CN 102054330A
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Abstract
The invention discloses an embedded disaster monitoring device, which adopts a modular design and comprises a baseboard module, a master control board module, an RS485 module, a switching value input module and a switching value output module. The integral structure is a controller area network (CAN) bus structure, and a double-redundant CAN bus is used to improve the reliability and safety; various board cards of the device are pluggable, and realizes hot plug function; the master control board module and sub-board modules adopt hot standby technology to ensure that the device can continuously, safely and reliably complete preset functions; in the device, an embedded Advanced RISC Machine (ARM) chip is adopted as a central processing unit (CPU) of a master control board, an AVR singlechip is adopted as a CPU of each sub-board, and uClinux is adopted as an operating system; an Ethernet interface is integrated so as to communicate with a server, and an RS232 interface is integrated to communicate with an upper computer; and the embedded disaster monitoring device has voltage monitoring and failure warning functions.
Description
Technical field
The present invention relates to a kind of disaster monitoring device based on embedded technology, device calculates disaster according to input information whether the disaster rank takes place to reach, and reports to the police and make corresponding security control measure.
Background technology
China is one of country that disaster is frequent and serious in the world, comprises floods, disaster caused by a windstorm, snow disaster, fire and earthquake etc., the generation of these disasters whether and the rank that takes place be directly connected to the loss of property and people's life security.How to design one safely and effectively the disaster monitoring device be a topic of extensively being paid close attention at present.At present the disaster monitoring apparatus structure complexity of using is huge, with high costs, specificity is big, and maintainability and extendability are poor, is difficult to adapt to the needs of general occasion.
Summary of the invention
Present disaster monitoring apparatus structure is complicated and huge, with high costs in order to overcome, versatility and the relatively poor problem of extendability, the invention provides a kind of simple in structure, financial cost is low, versatility and favorable expandability, strong interference immunity, and safe and reliable disaster monitoring device.
For solving existing technical matters, the present invention has adopted following technical scheme:
Modular design is adopted in invention, and device is divided into floor module, master control borad module and a plurality of daughter board module; Adopt bus-organization, with master control borad module and daughter board module carry on the CAN bus, by CAN bus realization communication between plates; The design of employing dual-redundant CAN bus; Master control borad module, daughter board module adopt double-machine standby technology, and each master control borad module and daughter board module all comprise hot plate and two pcb boards of slave board; The various integrated circuit boards of device adopt the hot swap type design; Adopt the embedded-type ARM chip as master control borad CPU, the AVR chip is as daughter board CPU; Adopt uClinux as master control borad operating system; Integrated Ethernet interface and server communication on the master control borad, integrated RS232 interface is communicated by letter with host computer.Adopt anti-jamming circuit and electrical isolation chip on a large scale, prevent extraneous interference.
Above-mentioned master control borad CPU adopts the S3C44B0X chip;
Also be integrated with the power conversion unit of 5V commentaries on classics 3.3V and 2.5V on the described master control borad, the RTL8019 chip is the Ethernet interface of controller, MAX3232 is the RS232 interface of controller, and SJA1000 is that controller, 82C250 are that transceiver, CD4052 are the CAN unit of switch; The integrated NANDFLASH of master control borad, NORFLASH, SDRAM, J-TAG on-line debugging interface, digital display tube and alarm; Master control borad integrated power supply observation circuit, two-node cluster hot backup circuit.
Master control borad and daughter board are carrier is carrier with the base plate, are inserted on the base plate by din connector and work; Be integrated with power supply unit, redundant dual CAN bus, din connector socket on the base plate.
Adopt technique scheme, the present invention has following beneficial effect:
1. modular design makes that the structure of device is more clear, and function allocation and responsibility are more clear and definite, and maintenance, maintenance are got up convenient.
Bus-organization make master control borad module and daughter board module increase or reduce very convenient; The CAN bus makes device structurally greatly simplify as system bus, and economy significantly improves; The strong anti-interference ability of CAN bus has strengthened the anti-interference of device; The strong driving force of CAN bus (but 110 nodes of carry) has strengthened the extendability of device; The redundant CAN bus design makes the reliability of device and security significantly improve.
3. the design of integrated circuit board plug-in makes that the device maintenance, repair are more convenient; Hot plug technology has guaranteed that on the one hand the replacing of a certain integrated circuit board can not influence the work of whole device, has also guaranteed staff's personal safety on the other hand.
4. master control borad module and daughter board module adopt double-machine standby technology, have further improved the reliability and the security of device, and assurance device can be continual and steady, safe and reliable finishes predetermined function.
5. the ARM7 chip that adopts high performance-price ratio is as the master control borad controller, satisfies under the prerequisite that function and workload require and improved economy; Master control borad possesses power supply monitoring, monitoring power supply supply situation.
6. adopt simplify, stablize, uClinux system that portability is strong is as master control borad operating system, made things convenient for various tasks are dispatched and managed, and reduced the software programming workload; And uClinux is free open source software, has reduced cost significantly.
7. adopt anti-jamming circuit and electrical isolation chip on a large scale, significantly improve the antijamming capability of device.
Description of drawings
Fig. 1 is one-piece construction figure of the present invention;
Fig. 2 is the master control borad basic block diagram;
Fig. 3 is a RS485 tablet basic block diagram;
Fig. 4 is a switching value tablet basic block diagram;
Fig. 5 is the digital output module basic block diagram;
Fig. 6 is CAN bus structure figure;
Fig. 7 is the hot plug block diagram;
Fig. 8 is the two-node cluster hot backup block diagram.
Embodiment
The invention will be further described below in conjunction with accompanying drawing:
1. device one-piece construction
As shown in Figure 1, device comprises a floor module, master control borad module and three sub-plate module (RS485 load module, switching value output module and switching input module); Can receive the input of two-way RS485 and 8 way switch amount disaster data, the output of 8 way switch amount control signals is provided; Be equipped with the RS232 interface communicating by letter with host computer, Ethernet interface with server communication; Adopt bus-organization, master control borad module and daughter board module on the CAN bus, are carried out communication between plates by the CAN bus as the node carry; The two Redundancy Design of CAN bus are as figure CAN bus A and CAN bus B; It is hot plate and slave board that master control borad module and each daughter board module all comprise two in full accord but separate pcb boards of hardware configuration, to realize hot-backup function.Adopt ARM chip S3C44B0X as master control borad CPU, adopt the CPU of AVR singlechip chip ATMEGA162 as 3 daughter boards.
2. integrated circuit board design
The integrated circuit board of device adopts the plug-in design, comprises 9 pcb boards (1 base plate, 2 master control borads, 2 RS485 tablets, 2 switching value tablets, 2 digital output modules) at present; Master control borad and daughter board are carrier is carrier with the base plate, are inserted into back work on the base plate by din connector.
Base plate is the carrier of master control borad and daughter board; Base plate integrated power supply unit, the 5V voltage that provides master control borad and daughter board to need; The integrated redundancy dual CAN bus; Integrated din connector socket is to be connected with daughter board with master control borad; Reserve a plurality of sockets, can expand the daughter board module easily, realize the input and output of more signals.
Master control borad is realized most of data processing and integrated circuit board coordinated control function, and as the interface of device and server and host computer.According to its workload, adopt high performance ARM7 chip S3C44B0X as CPU.Figure 2 shows that master control borad basic structure: the integrated power supply converting unit, the 5V voltage transitions is become required 3.3V of CPU and 2.5V voltage; The NORFLASH chip of integrated 4M is to place operating system, and the NANDFLASH chip of 32M is placed application program and significant data, and the SDRAM of 8M is as dynamic storage; Integrated CAN unit is to carry out CAN communication; The RS232 interface is controller with MAX3232, carries out RS232 by RS232 interface chip MAX3232 with host computer and communicates by letter; Ethernet interface is a controller with the RTL8019 chip, by ethernet controller chip RTL8019 access network based on ethernet with server communication, and carry out electrical isolation with Ethernet isolating transformer 20F001N and prevent to disturb; AD converter sampling 5V voltage by CPU carries carries out power supply and detects; Integrated digital display tube display device working condition; The integrated alarm device is so that report to the police during fault.
The RS485 tablet receives the input of two-way RS485 signal, it is done to convert the CAN signal to after the pre-service be sent to master control borad.According to its workload, adopt AVR single chip computer AT MEGA162 as CPU.Figure 3 shows that RS485 tablet basic structure: integrated CAN unit; Adopt DC/DC power isolator DCP0105D to carry out the electrical isolation of power supply, prevent to disturb; Adopt charged air bound from chip MAX1480B by the RS485 interface RS485 signal is converted into the acceptable signal of CPU and prevents external interference; The integrated alarm device is so that report to the police during fault.
The switching value tablet receives 8 way switch amounts inputs, it is done to convert the CAN signal to after the pre-service be sent to master control borad.According to its workload, adopt ATMEGA162 as CPU.Figure 4 shows that switching value tablet basic structure: integrated CAN unit; Adopt DC/DC power isolator DCP0105D to carry out the electrical isolation of power supply, prevent to disturb; Adopt two optocoupler TLP521-4 that the switching value signal is converted into the acceptable signal of CPU and carry out electrical isolation, prevent to disturb; Latch adopts 74HC245 to carry out signal latch control, prevents loss; The integrated alarm device is so that report to the police during fault.
Digital output module connects the CAN signal that master control borad is sent here, and it is dealt with, and converts 8 way switch amount control signals then to and exports extraneous control module to.According to its workload, adopt ATMEGA162 as CPU.Figure 5 shows that digital output module basic structure: integrated CAN unit; Adopt DC/DC power isolator DCP0105D to carry out the electrical isolation of power supply, prevent to disturb; Adopt two optocoupler TLP521-4 that cpu signal is converted into the switching value signal and carry out electrical isolation, prevent to disturb; Latch adopts 74HC245 to carry out signal latch control, prevents loss; The integrated alarm device is so that report to the police during fault.
3.CAN bus
Fig. 6 is CAN bus structure figure.Adopt SJA1000 as the CAN controller, 82C250 is as the CAN transceiver, and CD4052 is as bus switch, and the electrical isolation that optocoupler 6N137 realizes signal is set between controller and transceiver, prevents to disturb.
Device adopts the form of dual-redundant CAN bus to guarantee the reliability and the security of bus.Bus is divided into two of A, B, and master control borad is connected with two buses by bus switch CD4052 with CAN unit on the daughter board.During operate as normal, CD4052 is connected with bus A, disconnects with bus B, and device uses bus A work.Produce fault in case find bus A, then CPU sends switching signal to CD4052, disconnect itself and being connected of bus A, then connecting bus B uses bus B work, the lasting availability of assurance bus.
4. hot plug design
Fig. 7 is the hot plug block diagram.Usually have two kinds of danger during energising plug integrated circuit board, the one, may produce surge current and burn out circuit, the 2nd, may produce spike defective chip I/O pin.The present invention adopts hot-swapping controller LTC4217, triple gate 74HC245 and connector pinout setting to solve this two problems.
Connector pinout length is divided into long and short two kinds, and power supply is for short, and signal is for long.When integrated circuit board was plugged, the signal wire of base plate and daughter board was connected earlier, is power lead then.Signal wire connects when going up, because 74HC245 does not power on as yet, is closed condition, thereby has stoped the spike that produces when plugging to damage the I/O pin of subsequent conditioning circuit.When power lead connected, because the inhibiting effect of LTC4217, input current was limited within the acceptable range, prevented that circuit from being burnt out by big electric current.
When integrated circuit board was pulled up, because power pins is the shortest, integrated circuit board at first cut off the power supply.This moment, 74HC245 was because outage is closed, and the spike that plug afterwards produces is isolated by it equally, can't damage the I/O pin of subsequent conditioning circuit.
5. two-node cluster hot backup
Device utilizes CAN bus and two signal wires to realize two-node cluster hot backup.As shown in Figure 8, heat is equipped with module and comprises hot plate and slave board, and two plates all have unique separately CAN bus ID.During beginning, hot plate and slave board all work on power, but have only hot plate to run application and monitoring facilities, only operational monitoring program of slave board.During the work of two plates, regularly on bus, issue oneself state information.If hot plate can not receive the slave board status information or receives wrong status information, then think the slave board fault, then report to the police and send signal by the C1 signal wire, the bus switch CD4052 that closes slave board is with slave board and bus isolation.If slave board can not receive the hot plate status information or receives wrong status information, then think the hot plate fault, then report to the police and send signal by the C2 signal wire, the CD4052 that closes hot plate is with hot plate and bus, and accesses application program, takes over hot plate work.
6. workflow
During work, extraneous input RS485 signal and switching value signal, RS485 tablet and switching value tablet receiving inputted signal, and do pre-service, and convert the pre-service result to the CAN signal then, deliver to master control borad by the CAN bus; It is handled to the signal received according to application program in master control, judges that according to result whether the generation rank takes place to reach disaster, and exports corresponding control signal to the switching value output unit; Simultaneously, master control borad backs up significant data, and significant data and unit state are sent to host computer, server respectively by RS232 interface, Ethernet interface.Digital output module receives master control borad and sends signal here, and converts thereof into the switching value signal, exports extraneous control module to.The device duration of work, as the slave board fault, then hot plate is isolated it and the alert notice maintenance; As the hot plate fault, then slave board is isolated it, and takes over its work, finishes this module predetermined function, alert notice maintenance simultaneously.Device of the present invention can be expanded 2 sub-plate module at least again, receive the more controlled quentity controlled variables of more signal input and output, this moment, the constant but task amount of function of master control borad increased, and the tablet course of work of expansion is with the switching value tablet, and the output board course of work of expansion is with the switching value tablet.
Claims (5)
1. an embedded disaster monitoring device is characterized in that: adopt modular design, device is divided into floor module, master control borad module and a plurality of daughter board module; Adopt bus-organization, with master control borad module and daughter board module carry on the CAN bus, by CAN bus realization communication between plates; The design of employing dual-redundant CAN bus; Master control borad module, daughter board module adopt double-machine standby technology, and each master control borad module and daughter board module all comprise hot plate and two pcb boards of slave board; The various integrated circuit boards of device adopt the hot swap type design; Adopt the embedded-type ARM chip as master control borad CPU, the AVR single-chip microcomputer is as daughter board CPU; Adopt uClinux as master control borad operating system; Integrated Ethernet interface and server communication on the master control borad, integrated RS232 interface is communicated by letter with host computer.
2. embedded disaster monitoring device according to claim 1 is characterized in that: master control borad CPU adopts the S3C44B0X chip, and daughter board CPU adopts the ATMEGA162 chip.
3. embedded disaster monitoring device according to claim 1, it is characterized in that: be integrated with the power conversion unit that 5V changes 3.3V and 2.5V on the master control borad, the RTL8019 chip is the Ethernet interface of controller, MAX3232 is the RS232 interface of controller, and SJA1000 is that controller, 82C250 are that transceiver, CD4052 are the CAN unit of switch; The integrated NANDFLASH of master control borad, NORFLASH, SDRAM on-line debugging interface, digital display tube and alarm; Master control borad integrated power supply observation circuit, two-node cluster hot backup circuit.
4. embedded disaster monitoring device according to claim 1 is characterized in that: master control borad and daughter board are carrier is carrier with the base plate, are inserted on the base plate by din connector and work.
5. embedded disaster monitoring device according to claim 4 is characterized in that: be integrated with power supply unit, redundant dual CAN bus, din connector socket on the base plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010570925 CN102054330A (en) | 2010-12-02 | 2010-12-02 | Embedded disaster monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010570925 CN102054330A (en) | 2010-12-02 | 2010-12-02 | Embedded disaster monitoring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102259594A (en) * | 2011-05-18 | 2011-11-30 | 河海大学 | Advanced reduced instruction-set computer (RISC) machine (ARM)-based integrated information display system for automobile |
| CN103077579A (en) * | 2013-01-05 | 2013-05-01 | 上海腾盛智能交通技术有限公司 | Communication protocol module equipment between tunnel fire alarm system and fiber/grating temperature-sensing detection system |
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| CN2433672Y (en) * | 2000-08-31 | 2001-06-06 | 李大荣 | Double CPU multifunction observe and control board |
| CN1586958A (en) * | 2004-09-09 | 2005-03-02 | 武汉正远铁路电气有限公司 | Logic controller for railway locomotive |
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| CN103077579A (en) * | 2013-01-05 | 2013-05-01 | 上海腾盛智能交通技术有限公司 | Communication protocol module equipment between tunnel fire alarm system and fiber/grating temperature-sensing detection system |
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Application publication date: 20110511 |