CN208737264U

CN208737264U - A kind of novel digital display instrument

Info

Publication number: CN208737264U
Application number: CN201821008641.1U
Authority: CN
Inventors: 秦旭东
Original assignee: TIANJIN FUTURE INSTRUMENTATION TECHNOLOGIES Ltd
Current assignee: TIANJIN FUTURE INSTRUMENTATION TECHNOLOGIES Ltd
Priority date: 2018-06-27
Filing date: 2018-06-27
Publication date: 2019-04-12
Anticipated expiration: 2028-06-27

Abstract

The utility model provides a kind of novel digital display instrument, including meter case, is equipped with HART protocol transceiver module, MCU and peripheral circuit module and multiple-channel output module inside meter case.HART protocol transceiver module, MCU and peripheral circuit module and multiple-channel output module are electrically connected with power module, MCU and peripheral circuit module receive the analog signal of transmitter conveying by HART protocol transceiver module described in Digital Signals, analog signal is transmitted to MCU by HART protocol transceiver module in a manner of digital signal and peripheral circuit module carries out Data Analysis Services, analysis and processing result is transmitted to multiple-channel output module with digital signaling by MCU and peripheral circuit module, and multiple-channel output module, which reconnects, provides the housing terminals of hardware supported for it.The beneficial effects of the utility model are: the design is suitable for, product structure is simple, small in size, high reliablity, has the characteristics that good maintenance-free feature and processing request are lower, is convenient for large-scale production.

Description

A kind of novel digital display instrument

Technical field

The utility model relates to electronic instrument field of measuring technique, more particularly, to a kind of novel digital display instrument.

Background technique

Currently, transmitter of the intelligence with communications protocol is more and more general in field measuring instrument in industrial automation Time, control room variable measures that display technology is also varied, but is all that analog signal the transmitter of live single parameter sends Just show what signal, its dependent variable measured by intelligent transducer in addition to master variable, these variables be all often concerning The signal of interest of safety, although HART (Highway Addressable Remote Transducer) protocol signal can pass It brings, can only also be shown on large-scale DCS (Distributed Control System) host of central control room, not side Convenient for the display on the display at scene or control cabinet or further control.In addition, not only intelligent transducer carries largely now The subsidiary parameter in field, meter status and user's master variable status information, and current trend is sensor Composite, and a machine is more Can, if pressure transmitter measurement has installation point temperature variable, fluid level transmitter measurement has installation point temperature variable and liquid layered Interface variable, these parameters generally all can not scene show that it is even more impossible to allow the due effect of these parameters performance.

It can be seen that how to develop a kind of novel digital display instrument, has and uses HART protocol signal as input signal, It can parse multiple variables that output measures, especially master variable and time variable, be applicable in all kinds of HART protocols on site and intelligently become Parsing, display, control and the forwarding of device measuring signal are sent, the advantages of number is shown can be provided in signal any position at the scene, It is a problem to be solved by those skilled in the art.

Summary of the invention

To solve the above-mentioned problems, the utility model provides a kind of novel digital display instrument.

A kind of novel digital display instrument of the utility model, including meter case, the meter case inside are equipped with HART protocol Transceiver module, MCU and peripheral circuit module and multiple-channel output module, the HART protocol transceiver module, MCU and peripheral circuit mould Block and multiple-channel output module are electrically connected with the power supply mould for reference power supply to be converted to power specification needed for it is worked normally Block, the MCU and peripheral circuit module receive field measuring instrument by HART protocol transceiver module described in Digital Signals The analog signal of middle transmitter conveying, the HART protocol transceiver module is by the analog signal being collected into digital signal Mode is transmitted to the MCU and peripheral circuit module carries out data analysis and processing, and the subsequent MCU and peripheral circuit module will Analysis and processing result is transmitted to the multiple-channel output module with digital signaling, and the multiple-channel output module reconnection mentions for it For the housing terminals of hardware supported.Wherein, the multiple-channel output module include Multiple-shower output, multichannel analog signals it is defeated Out, HART protocol output and the output of multi-channel control point.

Further, the Multiple-shower output can customize is shown by way of fixed, circulating or both mixing Show variable value.

Further, multichannel analog signals output may be selected any variable and export in any hardware simulation output signal The output signal of outputting standard industrial automation 4-20mA on channel.

Further, the HART protocol output may be selected in any hardware analog signal output channel with standard industry 4-20mA output signal output variable is automated, and is superimposed a HART protocol output.

Further, the multi-channel control point output can choose any variable and open in any hardware relay or collector Output node signal on link point signal output channels.

Further, the HART transceiver is HART protocol modem chip.

Further, the power module is the more energy efficient Switching Power Supply of light weight small in size.

A kind of novel digital display instrument of the utility model, has the advantage that compared with prior art

Firstly, since the MCU and peripheral circuit module directly receive the HART protocol transmitting-receiving mould in the utility model The digital signal of block transmission, due to being the transmission of data between display instrument and field measuring instrument transmitter, so will not There is the generation of any loss of significance problem, to avoid installing the defeated of poor anti jamming capability more demanding in traditional digital displaying meter Enter analog circuit, a reference source and analog-to-digital conversion adc circuit, significantly reduces the complexity of circuit.Due to without installation woth no need to Input analog circuit, a reference source and the analog-to-digital conversion adc circuit for seeking higher poor anti jamming capability, thereby reduce to the electricity The requirement of source module, therefore small in size, light-weight, more energy efficient new-type Switching Power Supply can be used.Secondly as using HART protocol transceiver module does not have to worry hardware so the utility model can parse all variables that in-situ transducer measures Number of channels limitation, can significantly facilitate the use and save the cost at scene in this way, the safety at the scene of improving and working efficiency. Finally, because the multiple-channel output module is applied in the novel digital display instrument, so described the utility model can not be by defeated Hardware limitation out can arbitrarily arrange the quantity and sequence of display output variable, can arbitrarily arrange the defeated of other output based version The sequence of variable out.The test and use at scene can be significantly facilitated in this way, improve working efficiency.It can be seen that this is practical new Type especially suitable for it is some without or without setting large size HART reception system Distributed Control System occasion, and product structure Simply, small in size, high reliablity has the characteristics that good maintenance-free feature and processing request are lower, is convenient for large-scale production.

Detailed description of the invention

Fig. 1 is the structural block diagram of the utility model.

Specific embodiment

In order to better understand the utility model, the utility model is carried out into one with attached drawing combined with specific embodiments below The description of step.

A kind of novel digital display instrument of the utility model continues to use display instrument shell pattern, installation approach and the electricity of industry spot Source introduces mode, wherein power module is the portion that power supply needed for gauge internal is converted into the input of all kinds of reference power supplies in scene Small in size, light-weight, more energy efficient and environmentally friendly new-type Switching Power Supply can be used in part.

As shown in Figure 1, MCU (Microcontroller Unit) microcontroller shown in a kind of novel digital display instrument Unit and peripheral circuit module are the nucleus modules of instrument, and internal includes functional central processing unit CPU and associated analog And digital circuit blocks.

The utility model then abandons those input analog hardwares and corresponding software data processing module completely, i.e., traditional is aobvious Show a large amount of analog circuit of instrument, including simulation input, filtering, protection, amplification, reference source circuit and ADC (Digital to Analog converter) analog-to-digital conversion module, the digital signal that HART protocol is sent is directlyed adopt, any essence is not had It spends loss problem to occur, while being greatly reduced the requirement to power supply.As long as also, the variable that in-situ transducer measures, it can All to parse, do not have to worry the limitation of hardware corridor quantity.Therefore, also without many restrictions in MCU chip selection, If but be digital-to-analogue conversion DAC using pulse-width modulation PWM and export, then it should be noted that MCU timer number meets output channel number wants It asks.The utility model uses the MSP430 Series MCU chip of low-power consumption.

The HART protocol transceiver module is to inquire all kinds of HART protocol intelligent transducers in scene by HART protocol timing The interlock circuit module of many measurands.Can directly using popular HART protocol modem chip, such as HT2015, A5191 is used very universal, herein in addition to its support circuit and input protection, does not need other special circuits.

The multiple-channel output module is numerous variables after instrument parsing, and scene shows or be all converted into the standards such as 4-20mA Signal exports respectively.The multiple-channel output module include Multiple-shower output, multichannel analog signals output, HART protocol output and The output of multichannel node control.

The Multiple-shower output can show variable value by the way of fixed, circulating or both mixing.It is logical Normal way is two to three display windows, and one is master variable, remaining shows time variable or circulation display.

The multichannel analog signals output refers to that can choose any variable leads in the output of any hardware simulation output signal The output signal of outputting standard industrial automation 4-20mA on road.The utility model uses the 4-20mA that two-way can customize Output signal.

HART protocol output, refer to can choose in any hardware analog signal output channel with standard industry from Dynamicization 4-20mA output signal output variable, and it is superimposed a HART protocol output.The utility model uses two-way can Customized variable is that the HART protocol of master variable exports.

The multi-channel control point output, refers to and can choose any variable in any hardware relay or collector open loop section Output node signal on point signal output channels, carries out simple field control operation.The utility model uses two-way each two A relay output signal that can customize alarm point.

It is that multichannel input and output provide the shell of hardware supported that the shell Wiring module, which refers to based on modular housing, Connection terminal portion is required according to user with variable number of species, the correspondence shell and connection type configured.

The embodiments of the present invention are described in detail above, but the content is only the preferable of the utility model Embodiment should not be considered as limiting the scope of the present invention.It is all to become according to equalization made by the scope of the utility model Change and improve etc., it shall still fall within the scope of this patent.

Claims

1. a kind of novel digital display instrument, including meter case, it is characterised in that: be equipped with HART protocol inside the meter case and receive Send out module, MCU and peripheral circuit module and multiple-channel output module, the HART protocol transceiver module, MCU and peripheral circuit module It is electrically connected with the power module for reference power supply to be converted to power specification needed for it is worked normally with multiple-channel output module, The MCU and peripheral circuit module receive to become in field measuring instrument by HART protocol transceiver module described in Digital Signals The analog signal for sending device to convey, the HART protocol transceiver module is by the analog signal being collected into a manner of digital signal It is transmitted to the MCU and peripheral circuit module carries out data analysis and processing, the subsequent MCU and peripheral circuit module will be analyzed Processing result is transmitted to the multiple-channel output module with digital signaling, and the multiple-channel output module reconnection provides firmly for it The housing terminals that part is supported；Wherein the multiple-channel output module include Multiple-shower output, multichannel analog signals output, HART protocol output and the output of multi-channel control point.

2. novel digital display instrument according to claim 1, it is characterised in that: the Multiple-shower output, which can customize, to be passed through Fixed, circulating or both mixed mode shows variable value.

3. novel digital display instrument according to claim 1, it is characterised in that: the multichannel analog signals output may be selected to appoint The output signal of what variable outputting standard industrial automation 4-20mA in any hardware simulation output signal output channel.

4. novel digital display instrument according to claim 1, it is characterised in that: the HART protocol output may be selected any With standard industry automated 4-20mA output signal output variable in hardware analog signal output channel, and it is superimposed a HART Agreement output.

5. novel digital display instrument according to claim 1, it is characterised in that: the multi-channel control point output, which can choose, appoints What variable output node signal on any hardware relay or collector open loop node signal output channel.

6. novel digital display instrument according to claim 1, it is characterised in that: the HART transceiver is HART protocol modulation Demodulation chip.

7. novel digital display instrument described in any one of -6 according to claim 1, it is characterised in that: the power module is body Product small, light weight, more energy efficient Switching Power Supply.