CN201716587U - Multi-channel current analog quantity conversion/distribution module - Google Patents
Multi-channel current analog quantity conversion/distribution module Download PDFInfo
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- CN201716587U CN201716587U CN2010202665609U CN201020266560U CN201716587U CN 201716587 U CN201716587 U CN 201716587U CN 2010202665609 U CN2010202665609 U CN 2010202665609U CN 201020266560 U CN201020266560 U CN 201020266560U CN 201716587 U CN201716587 U CN 201716587U
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- current analog
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- analog amount
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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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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The utility model discloses a multichannel current analog quantity conversion/distribution module, including MCU main control unit, current analog quantity input unit, current analog quantity output unit and RS-485 communication unit, current analog quantity input unit, current analog quantity output unit, RS-485 communication unit are connected and mutual isolation with MCU main control unit respectively. The MCU main control unit sequentially collects four current analog input channels, converts the four current analog input channels into digital quantity, outputs the digital quantity through RS-485 communication according to communication configuration parameters and communication protocols, converts the digital quantity into standard current signals through the current analog output unit according to the channel configuration parameters, and realizes conversion of multi-channel current analog, data output and current signal distribution. Compared with the prior art, the utility model has the advantages of the configuration is nimble, the interference killing feature is strong, the line is simple, it is convenient and the commonality is strong to maintain, is particularly suitable for industrial automation application.
Description
Technical field
The utility model relates to a kind of current analog amount conversion/distribution module, more specifically, relates to a kind of conversion of hyperchannel current analog amount and current signal distribution module in industrial control system, belongs to technical field of industrial automatic control.
Background technology
Detecting line sensor or instrument such as densimeter, flowmeter, level-sensing device and various transmitter that the reflection production run is all arranged in many industry, these field instruments are except that this locality shows, export the accurate current signal of a road sign (such as 4～20mA), for uses such as other system such as PLC, DCS, unit supervisory systems toward contact.But in actual applications, the simulating signal that field instrument output often occurs need be used for a plurality of supervisory systems, and one tunnel simulating signal does not satisfy requirement at all.In order to address this problem, the way that adopts is to use current signal distributor at present, changes one road current analog signal into two-way or multichannel current signal that signal equates, uses (see figure 1) for different systems.Therefore present many control system comprise the distribution (or shunting) of current signal and two links of mould/number conversion of current signal at least.The current signal of field instrument output all is to be used by all kinds of supervisory systems based on computing machine or PLC basically, is carried out the conversion of analog quantity/digital quantity in supervisory system by PLC module, analog quantity load module or analog signal input card etc.
Adopt this mode, each current signal distributor need connect power supply, current signal after distributing simultaneously also will be connected in the different control system, the current signal that is assigned with is many more, it is also complicated more to connect line, interference between the synchronous signal is also serious more, therefore causes problems such as system complex, cost height and maintenance are big.
Summary of the invention
In order to solve the problems of the technologies described above, the purpose of the present utility model is: provide a kind of and the accurate current analog signal of 4 road signs can be converted to digital quantity, export by RS-485 again, and be the multichannel current signal that equates with the primary current signal with the current standard signal transition, the hyperchannel current analog amount conversion/distribution module of using for a plurality of supervisory systems.
In order to realize the foregoing invention purpose, the technical solution adopted in the utility model is: a kind of hyperchannel current analog amount conversion/distribution module, it is characterized in that: comprise MCU Main Processing Unit, current analog amount input block, current analog amount output unit and RS-485 communication unit, current analog amount input block, current analog amount output unit, RS-485 communication unit are connected with MCU Main Processing Unit by the I/O line.
MCU Main Processing Unit described in the utility model comprises MCU primary controller, reset circuit and parameter memory circuit, and reset circuit, parameter memory circuit are connected with the MCU primary controller respectively.Reset circuit plays electrification reset and house dog effect, and after system caused program fleet or endless loop because of interference, it is normal that reset circuit produces the reset enable signal system recovery automatically.The parameter memory circuit is used to preserve the utility model modules configured parameter.
Current analog amount input block described in the utility model comprises current analog amount input interface, multi-way switch circuit, A/D change-over circuit and buffer circuit I, current analog amount input interface, multi-way switch circuit, A/D change-over circuit and buffer circuit I link to each other successively, and buffer circuit I also is connected with the MCU primary controller of multi-way switch circuit, MCU Main Processing Unit.
Current analog amount output unit described in the utility model comprises buffer circuit II, D/A circuit, V/I circuit and electric current output interface, buffer circuit II is connected with the MCU primary controller of MCU Main Processing Unit, the I/O signal of MCU primary controller is isolated the back by photoelectricity and is linked to each other with the D/A circuit, the D/A circuit is converted to the digital signal of serial the voltage signal of simulation, change voltage signal the normalized current signal of 0-20mA or 4-20mA into by the V/I circuit again, and be connected with the electric current output interface.Described current analog amount output unit comprises four tunnel independently D/A circuit and V/I circuit, can finish simultaneously four the tunnel independently serial digital signal to the conversion of current analog amount signal.
RS-485 communication unit described in the utility model comprises RS-485 bus transceiver and RS-485 interface, the RS-485 bus transceiver is connected with the MCU primary controller, the Transistor-Transistor Logic level that the MCU primary controller is had a full duplex serial communication port is converted to the differential transfer data-signal of RS-485 bus, be connected with other RS-485 equipment by the RS-485 interface, constitute the RS-485 communication network.
In the storer of MCU Main Processing Unit parameter memory circuit, preserve the system configuration parameter of following several types, make to the utlity model has different functions.
1. channel arrangement parameter
(1) channel type parameter
The IO channel type parameter is a byte, is mainly used in input channel (IN is set
0～IN
3) and output channel (OUT
0～OUT
3) current analog amount type, certain position is to represent current analog amount 0～20mA at 0 o'clock to high four of byte to low four of byte corresponding to four output channels corresponding to four input channels, is to represent 4～20mA at 1 o'clock.
Default value is FFH, and promptly the current signal scope of input channel and output channel is 4～20mA.
(2) passage mapping parameters
The IO channel mapping parameters is 2 bytes, is mainly used in to indicate 4 input channel (IN
0～IN
3) be mapped to which or several output channel respectively, also promptly determine input current signal to be assigned to 1 the road or the identical current analog amount of multichannel numerical value.A certain position is to represent from this passage output in 1 o'clock, is that represented in 0 o'clock can not be from this passage output on the contrary.
Default value is (84H, 21H), i.e. IN
0-OUT
0, IN
1-OUT
1, IN
2-OUT
2, IN
3-OUT
3, the current analog amount of expression input through the A/D conversion after, export the current signal of same numerical value again from corresponding output channel, realizes 1 pair 1 electric current distribution, concrete configuration is as follows.
2 communication configuration parameter
Communication configuration parameter is 2 bytes, be mainly used in RS-485 mailing address, baud rate be set, whether need verification and, form of RS-485 output analog data or the like.
Wherein, first byte is RS-485 address (00-FFH); The Bit7 of second byte represents whether RS-485 communication string needs verification and (1 needs, 0 do not need); Bit6～Bit5 represent baud rate (00-9600,01-19200,10-57600,11-115200); Bit1～Bit0 represents the form (00-quantities, 16 systems of 01-2 byte) of RS-485 communication simulation amount data; Bit4～Bit2 is standby.
Default value is (00H, 00H), promptly the RS-485 mailing address of module be 00H, do not need verification and, baud rate is 9600bps, quantities data output format.
For with module communication, realize to revise the analog data of system configuration parameter and read module, should follow following communication protocol.
(1) modified module configuration parameter order
Form: %AANNBBTTMHMLE (the initial symbol of %-, AA-2 position 16 system module's addresss, the new address of 16 system modules, NN-2 position, BB-2 position 16 system communication configuration parameter, TT-2 position 16 system channel type parameters, MH-2 position 16 system passage mapping parameters high bytes, ML-2 position 16 system passage mapping parameters low bytes, E-carriage return end mark cr or ODH)
Return:! AA (cr) revises effectively; It is invalid that AA (cr) revises; Wherein! With? be initial symbol.
(2) read through model configuration parameter order
The initial symbol of form: $AAE ($-, AA-2 position 16 system module's addresss, E-carriage return end mark cr)
Return:! AABBTTMHML (cr) reads effectively; It is invalid that AA (cr) reads.
(3) read through model analog quantity order
Form: #AAE (the initial symbol of #-, AA-2 position 16 system module's addresss, E-carriage return end mark cr)
Return:＞(D0) (D1) (D2) (D3) (cr), garble is return message not then.Wherein＞and be initial symbol, D0, D1, D2 and D3 are analog data, form is relevant with the data layout of setting.
The course of work of the utility model hyperchannel current analog amount conversion/distribution module is that the MCU primary controller is gathered the current analog amount signal of four input channels successively, and it is converted to digital quantity respectively; Then according to the channel arrangement parameter, digital quantity is converted to the current signal of 0-20mA or 4-20mA by current analog amount output unit, export by the electric current output interface; According to RS-485 communication configuration parameter and communication protocol, the digital quantity of current analog signal is exported by RS-485 communication simultaneously.
The advantage of the utility model hyperchannel current analog amount conversion/distribution module is: realize in same module hyperchannel current analog amount mould/number conversion, analog data RS-485 communication output and carry out the distribution of multichannel electric current by configuration; Isolate mutually between the distribution output of the input of current analog amount, RS-485 communication, multichannel electric current and the MCU primary controller, antijamming capability is strong; Simultaneously line is simple, changes easy to maintenancely, and cost is low.
Description of drawings
Fig. 1 is the many control system synoptic diagram that uses distributing switch in the background technology;
Fig. 2 is for using many control system synoptic diagram of the utility model hyperchannel current analog amount conversion/distribution module;
Fig. 3 is the structure principle chart of the utility model hyperchannel current analog amount conversion/distribution module;
Fig. 4 is the shape assumption diagram of the utility model hyperchannel current analog amount conversion/distribution module;
Among the figure: 1, MCU Main Processing Unit, 2, current analog amount input block, 3, current analog amount output unit, 4, the RS-485 communication unit, 5, distributing switch
Embodiment
Below in conjunction with the drawings and specific embodiments the technical solution of the utility model is described in further detail.
Fig. 2, increases the DCS dispatch control system again and becomes easy on the basis of centralized control system for using many control system synoptic diagram of the utility model hyperchannel current analog amount conversion/distribution module.The current signal of sensor or instrument output connects the input end of the utility model hyperchannel current analog amount conversion/distribution module, RS-485 output connects 485 interfaces of the industrial computer of DCS system, industrial computer directly reads analog data in the utility model module according to 485 communication protocols, and the output of the utility model hyperchannel current analog amount conversion/distribution module connects the PLC analog module of centralized control system.After using the utility model, it is few, easy to maintenance that system connects line, and antijamming capability is strong.
Fig. 3 is the structure principle chart of the utility model hyperchannel current analog amount conversion/distribution module.As shown in Figure 3, a kind of hyperchannel current analog amount conversion/distribution module, comprise MCU Main Processing Unit 1, current analog amount input block 2, current analog amount output unit 3 and RS-485 communication unit 4, current analog amount input block 2, current analog amount output unit 3, RS-485 communication unit 4 are connected with MCU Main Processing Unit 1 by the I/O line.
Described MCU Main Processing Unit 1 comprises MCU primary controller, reset circuit and parameter memory circuit, and reset circuit, parameter memory circuit are connected with the MCU primary controller respectively.Described in the present embodiment MCU primary controller is the 89C52 single-chip microcomputer; Reset circuit uses microprocessor monitors chip MAX813, plays the effect of electrification reset and house dog, and after system caused program fleet or endless loop because of interference, MAX813 produced reset signal automatically, made system recovery normal; The parameter memory circuit uses the 24C02 of EEPROM, is used to preserve the utility model modules configured parameter.
Described current analog amount input block 2 comprises current analog amount input interface, multi-way switch circuit, A/D change-over circuit and buffer circuit I, current analog amount input interface, multi-way switch circuit, A/D change-over circuit and buffer circuit I link to each other successively, and buffer circuit I also is connected with the MCU primary controller of multi-way switch circuit, MCU Main Processing Unit.Described in the present embodiment multi-way switch circuit is ADG508, and the A/D change-over circuit is selected the ADS8325 with difference input for use.
Described current analog amount output unit 3 comprises buffer circuit II, D/A circuit, V/I circuit and electric current output interface, buffer circuit II is connected with the MCU primary controller of MCU Main Processing Unit, the I/O signal of MCU primary controller is isolated the back by photoelectricity and is linked to each other with the D/A circuit, the D/A circuit is converted to the digital signal of serial the voltage signal of simulation, change voltage signal the current signal of 0-20mA or 4-20mA into by the V/I circuit again, and be connected with the electric current output interface.Described current analog amount output unit comprises four tunnel independently D/A circuit and V/I circuit, can finish simultaneously four the tunnel independently serial digital signal to the conversion of current analog amount signal.Described in the present embodiment D/A circuit is DAC7513, and the voltage signal of output is realized the conversion of V/I again by OPA277 and 2N3904.
Described RS-485 communication unit 4 comprises RS-485 bus transceiver and RS-485 interface, the RS-485 bus transceiver is connected with the MCU primary controller, the Transistor-Transistor Logic level that the MCU primary controller is had a full duplex serial communication port is converted to the differential transfer data-signal of RS-485 bus, be connected with other RS-485 equipment by the RS-485 interface, constitute the RS-485 communication network.The enhancement mode RS-485 transceiver ADM2483 that described in the present embodiment RS-485 bus transceiver is isolated for the band triple channel.
All adopt isolation technology between MCU primary controller and current analog amount input block 2, current analog amount output unit 3 and the RS-485 communication unit 4, improved the antijamming capability of module.
The utility model hyperchannel current analog amount conversion/distribution module can realize multiple function by different configuration parameters is set, and is exemplified below.
Fig. 4 is the shape assumption diagram of the utility model hyperchannel current analog amount conversion/distribution module, and among the figure ,+V and GND are 12V, 15V or 24V dc power supply, IN
0+ and IN
0-, IN
1+ and IN
1-, IN
2+ and IN
2-, IN
3+ and IN
3-being respectively the link of four current analog amount input channels, 485+ is the link that RS-485 communicates by letter with 485-, OUT
0+ and OUT
0-, OUT
1+ and OUT
1-, OUT
2+ and OUT
2-, OUT
3+ and OUT
3-be respectively the link of four current analog amount output channels, also have the power supply indication on the module.In use, two or more hyperchannel current analog amount conversion/distribution module+V and GND, 485+ and 485-can be connected in series mutually.
Specific embodiment described above just illustrates the utility model spirit; obviously the utility model is not limited to above embodiment; under technician's various forms of modifications that described specific embodiment is made, replenish or adopt similar mode to substitute, all should think protection domain of the present utility model.
Claims (6)
1. hyperchannel current analog amount conversion/distribution module, it is characterized in that: comprise MCU Main Processing Unit, current analog amount input block, current analog amount output unit and RS-485 communication unit, current analog amount input block, current analog amount output unit, RS-485 communication unit are connected with MCU Main Processing Unit respectively, and isolate mutually.
2. hyperchannel current analog amount conversion/distribution module according to claim 1, it is characterized in that: described MCU Main Processing Unit comprises MCU primary controller, reset circuit and parameter memory circuit, and reset circuit, parameter memory circuit are connected with the MCU primary controller respectively.
3. hyperchannel current analog amount conversion/distribution module according to claim 1, it is characterized in that: described current analog amount input block comprises current analog amount input interface, multi-way switch circuit, A/D change-over circuit and buffer circuit I, current analog amount input interface, multi-way switch circuit, A/D change-over circuit and buffer circuit I link to each other successively, and buffer circuit I also is connected with the MCU primary controller of multi-way switch circuit, MCU Main Processing Unit.
4. hyperchannel current analog amount conversion/distribution module according to claim 1, it is characterized in that: described current analog amount output unit comprises buffer circuit II, D/A circuit, V/I circuit and electric current output interface, buffer circuit II is connected with the MCU primary controller of MCU Main Processing Unit, the I/O signal of MCU primary controller is isolated the back by photoelectricity and is linked to each other with the D/A circuit, the D/A circuit is converted to the digital signal of serial the voltage signal of simulation, change voltage signal into the normalized current signal by the V/I circuit again, and be connected with the electric current output interface.
5. hyperchannel current analog amount conversion/distribution module according to claim 1, it is characterized in that: described RS-485 communication unit comprises RS-485 bus transceiver and RS-485 interface, the RS-485 bus transceiver is connected with the MCU primary controller, the Transistor-Transistor Logic level of described MCU primary controller is converted to the differential transfer data-signal of RS-485 bus, be connected with other RS-485 equipment by the RS-485 interface, constitute the RS-485 communication network.
6. hyperchannel current analog amount conversion/distribution module according to claim 5 is characterized in that: the enhancement mode RS-485 transceiver ADM2483 that described RS-485 bus transceiver is isolated for the band triple channel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202665609U CN201716587U (en) | 2010-07-22 | 2010-07-22 | Multi-channel current analog quantity conversion/distribution module |
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|---|---|---|---|
| CN2010202665609U CN201716587U (en) | 2010-07-22 | 2010-07-22 | Multi-channel current analog quantity conversion/distribution module |
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| CN201716587U true CN201716587U (en) | 2011-01-19 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103197624A (en) * | 2013-03-05 | 2013-07-10 | 天津城市建设学院 | Central heating system controller based on digital signal processor (DSP) |
| CN103346793A (en) * | 2013-07-19 | 2013-10-09 | 深圳创维－Rgb电子有限公司 | Method and device for ADC automatic correction |
| CN103454448A (en) * | 2013-01-17 | 2013-12-18 | 成都阜特科技股份有限公司 | Low-frequency acceleration sensor transmitter |
| CN105116238A (en) * | 2014-05-05 | 2015-12-02 | 广州地铁集团有限公司 | System and method for testing analog input/output modules of subway train |
| CN106909137A (en) * | 2017-02-27 | 2017-06-30 | 中国核动力研究设计院 | A kind of diagnosis coverage rate analog quantity isolation distributor high |
| CN110780111A (en) * | 2019-11-11 | 2020-02-11 | 杭州和利时自动化有限公司 | Current type analog quantity output module and control method thereof |
| 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 |
-
2010
- 2010-07-22 CN CN2010202665609U patent/CN201716587U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454448A (en) * | 2013-01-17 | 2013-12-18 | 成都阜特科技股份有限公司 | Low-frequency acceleration sensor transmitter |
| CN103197624A (en) * | 2013-03-05 | 2013-07-10 | 天津城市建设学院 | Central heating system controller based on digital signal processor (DSP) |
| CN103346793A (en) * | 2013-07-19 | 2013-10-09 | 深圳创维－Rgb电子有限公司 | Method and device for ADC automatic correction |
| CN105116238A (en) * | 2014-05-05 | 2015-12-02 | 广州地铁集团有限公司 | System and method for testing analog input/output modules of subway train |
| CN105116238B (en) * | 2014-05-05 | 2018-04-06 | 广州地铁集团有限公司 | A kind of subway train analog input and output module test system and its method of testing |
| CN106909137A (en) * | 2017-02-27 | 2017-06-30 | 中国核动力研究设计院 | A kind of diagnosis coverage rate analog quantity isolation distributor high |
| CN106909137B (en) * | 2017-02-27 | 2019-09-06 | 中国核动力研究设计院 | A kind of high diagnosis coverage rate analog quantity isolation distributor |
| CN110780111A (en) * | 2019-11-11 | 2020-02-11 | 杭州和利时自动化有限公司 | Current type analog quantity output module and control method thereof |
| 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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|---|---|---|---|
| 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: 20110119 Termination date: 20130722 |