CN206248103U - Transmitter interface device - Google Patents

Abstract

A kind of transmitter interface device of transmitter, is related to the interfacing of the primary instrument transmitter of industrial process control field, has printed board inside shell of transducer and for fixed printed board and the support of direct current supply Interface Terminal.In the plant-grid connection area of printed board, three terminals a, b, c or d and a resistance are provided with, three terminals may be designed as pure pad, two terminals of resistance or are respectively connected to terminal c and a, or be respectively connected to terminal b and d.Externally fed loop can directly power through terminal A and B to transmitter, when externally fed power supply or loop power through terminal C and terminal B or terminal A and terminal D to transmitter, can ensure that the test pencil of transmitter setting apparatus can directly hang on terminal A and terminal B, achieve that the communications exchange data of setting apparatus and transmitter, and need not take out stitches, connect the operations such as provisional resistance and wiring, it is greatly improved the debugging efficiency of relevant control measuring system or equipment.

Description

Transmitter interface device

Technical field

The utility model is related to the interfacing of the primary instrument transmitter of industrial process control field, especially routine two The interface device of line transmitter.

Background technology

At present in industrial process control field, field signal acquisition, measurement, the change widely used two-wire system transducer reality of sending end Existing, its brand mainly has the companies such as Honeywell, Rosemount.

The basic functional principle of transmitter is to be provided a DC voltage by the upper end of control system and worked, transmitter There is the physical signalling that electricity can be surveyed after working according to itself（Such as pressure, temperature signal）Size, to the offer of DC voltage Person exports a current signal linear with surveyed physical signalling, and a sampling resistor pair is passed through at the offer end of voltage Current signal is sampled, so as to obtain the size of physical signalling；The supplier of voltage can be the number of secondary meter, computer According to capture card, distributor, signal feed isolation module are may also be, the current signal that both will need to measure afterwards is reallocated, this The transmission range of two-wire system current signal transfer device is planted up to upper km, strong antijamming capability, is widely used.

As the transmitter of the major companies such as Honeywell, Rosemount production, decapacitation passes through connect both threads or turnover Line terminals are realized power supply, are transmitted outside current signal, moreover it is possible to realize the digital communication between transmitter setting apparatus and transmitter.That is pick-up Device is by same two line or two interfaces of terminal on equipment of itself, you can the current signal of transmission analog quantity form, and energy With miscellaneous equipment interactive information in the form of data signal；This digital communication is usually to rely on HART（High-speed remote addressable Sensor）The customized protocol realization of agreement or producer.The producer for producing such transmitter is provided which transmitter setting apparatus, Soft setting can be carried out to parameters such as the range of transmitter, response times by setting apparatus, and transmitter entering signal source can be made Working method, can now specify the signal of arbitrary size in transmitter output measurement range by setting apparatus；By transmitter Signal source working method, the corresponding measuring instrumentss in control room end or other measuring apparatus accuracies of measurement are carried out site inspection, Adjustment and its convenience.

When transmitter wiring powered operation, and want the scene of transmitter is being installed, with transmitter setting apparatus to transmitter When being operated parameter setting or checking secondary meter, the accuracy of measurement of computer data acquiring board, need to be by setting apparatus A pair of test pencils（Presented with hooking device or crocodile clamp device）, hang over or be clipped in two ends of transmitter power supply inlet-outlet line On son, to realize the data communication between setting apparatus and transmitter.Transmitter this be to power supply terminal for powering, output current Signal（Transmission analog quantity task）, and digital information is transmitted in semiduplex mode.When carrying out reliable digitized communication When, in the whole power supply, current sampling measuring loop in transmitter, power supply terminal will have the pull-up of 250 more than Ω with outer portion Or pull down resistor could be realized, because when digital communication is carried out, transmitter is correspondence numeral " 1 " output one in control loop Determine the current signal of feature, correspondence digital " 0 " exports the current signal of another feature, the pullup or pulldown resistance of 250 more than Ω The obvious voltage signal for representing digital " 1 " and digital " 0 " will be produced, when the timing of supply voltage one of transmitter, is now existed Also the obvious voltage signal for representing digital " 1 " and digital " 0 " will be produced between transmitter power supply terminal, digital communication is just able to Realize.

Because secondary meter, computer data acquiring card, distributor are exported with 250 Ω resistance to two-wire system transducer Current signal carry out signal sampling, in transmitter is connected to such data acquisition circuit, transmitter and transmitter set When device carries out digital communication, 250 Ω current signals sampling resistors in measuring loop are just served needed for digital communication function The effect of pullup or pulldown resistance.In measuring system is controlled, if transmitter is connected in measuring loop in this way, When transmitter setting apparatus and transmitter need to carry out digital communication in erecting bed, the end cap of transmitter need to only be opened, will become Send the test pencil of device setting apparatus to hang over or be clipped on two terminals of transmitter electric power incoming line to be capable of achieving.

But, in contemporary highly reliable data collecting system or Process Control System, in transmitter and secondary meter Between or computer data acquiring card between, often add referred to as feed isolation signals module element, by it for transmitter is powered, The current signal of collection transmitter output, the current signal that will be collected is sent to secondary meter or calculating again after isolated variable Machine data collecting plate card；Such feed isolation signals processing module is made all very exquisite at present, and its current sampling resistor is general Only 50 Ω.In measuring system is controlled, if transmitter is connected in measuring loop in this way, when transmitter setting Device, because the current signal sampling resistor in loop only has 50 Ω, need to make with transmitter when erecting bed carries out digital communication It is not enough to produce the voltage signal change for representing digital " 1 " and digital " 0 " between transmitter power supply inlet-outlet line two-terminal, needs especially to exist Measuring loop China and foreign countries separately add the resistance of 200 more than Ω, just can guarantee that the amplitude requirement of digital communication signal, it is ensured that digital communication It is reliable to realize.

Can be by two terminals of transmitter electric power incoming line（One is the anode of power supply, and another is the negative terminal of power supply）In one Individual interim disconnection, goes here and there into a resistance of 200 more than Ω, is addressed problem.Will power line positive terminal or negative pole end Pulled down from terminal, and an end of resistance is connected on the terminal, and the single power line that will have been pulled down is connected to the other end of resistance, Transmitter is worked, and digital communication can be carried out.Finished when to transmitter debugging, then the wiring of transmitter is recovered former Sample；Transmitter need to such as be debugged again, need wiring in such a way again.

One power plant or a petrochemical plant often have thousands of transmitters, if each transmitter presses this sample prescription Formula carries out patch to be debugged, and can produce substantial amounts of labour cost.In China with expanding economy, labour into Originally more and more higher is become, this kind of debud mode of transmitter is more and more denounced；Designed according to modern product " six property " Viewpoint, its testability and maintainability have much room for improvement.

Utility model content

In order to solve the interface arrangement of existing transmitter, when transmitter needs to be debugged with setting apparatus, usually need by The line for having connected is pulled down from transmitter plant-grid connection terminal temporarily, temporary Tandem accesses the appropriate resistance of resistance, a debugging Line need to be connected after finishing and again, the control of correlation or the debugging work load of measuring system is multiplied this problem, this Utility model provides a kind of interface arrangement of transmitter so that transmitter can outside the normal work as existing transmitter, when Transmitter is installed after wiring finishes in initial application places, no longer needs to carry out the provisional line that disconnects to achieve that equipment or system Debugging.

The utility model solves the technical scheme that its technical problem used：A kind of interface arrangement of transmitter, pick-up The basic structure of device is consistent with current existing most structure of transmitter, main by printed board, for solid in its enclosure interior Determine the support composition of printed board and fixed direct current supply Interface Terminal.In design, its element arrangement is logically divided for printed board Into two regions, one is functional task area for completing real work task, and another is the power supply for accessing power supply Access area；It is furnished with terminal or pad c, terminal or pad a, terminal or pad b and resistance RB in plant-grid connection area or is furnished with Terminal or pad a, terminal or pad b, terminal or pad d and resistance RA；It is furnished with pad V+ and V- in functional task area；Terminal or Pad a is connected with pad V+ by printed board cabling, and terminal or pad b are connected with pad V- by printed board cabling；Resistance RB Two terminals, be connected with terminal or pad c and terminal or pad a respectively by printed board cabling, two of resistance RA connect Line end, is connected with terminal or pad b and d respectively by printed board cabling；Functional task area passes through pad V+ and V- cut-in operation Power supply, V+ is positive source incoming end, and V- is power cathode incoming end；The support of transmitter is used for transmitter at least provided with three The terminal being attached with outside, these three terminals are respectively terminal C, terminal A, terminal B or terminal A, terminal B, end Sub- D；Terminal A is connected with terminal or pad a with wire, and terminal B is connected with terminal or pad b with wire, terminal C and terminal or weldering Disk c is connected with wire, and terminal D is connected with terminal or pad d with wire.

In technical solutions of the utility model, plant-grid connection area will configure 1 resistance in printed board, have two kinds of configurations Device, a kind of positive source incoming end for being disposed on printed board plant-grid connection area, that is, a terminals for configuring resistance will be with Terminal or pad a are connected, and now claim resistance RB；The power cathode that another kind is disposed on printed board plant-grid connection area is accessed End, that is, a terminals for configuring resistance will be connected with terminal or pad b, and now the resistance is called RA.Matched somebody with somebody resistance RB or It is that the resistance of RA is 200 Ω or 250 Ω, its power nominal value should be not more than 0.5W, and 0.25W just meets needs.On support at least Have three for externally fed power supply or loop-coupled terminal, and with printed board on plant-grid connection terminal or pad into One-to-one relationship, carries out correspondence connection inside transmitter with wire.

When the resistance configuration matched somebody with somebody when printed board plant-grid connection area is in positive source incoming end, plant-grid connection area set altogether c, Tri- binding posts of a and b or pad, the resistance matched somebody with somebody are RB, and two terminals is connected with terminal or pad c and a respectively； At least equipped with three terminals or pad c, a in terminal C, terminal A, tri- binding posts of terminal B, with plant-grid connection area on support Accordingly it is attached with wire with b；The dc source that outside is come can power through terminal C and terminal B to transmitter, also can be through end Sub- A and terminal B power to transmitter makes its work, and terminal C and terminal A is the positive pole incoming end of power supply, and terminal B is negative for power supply Pole incoming end.

When the resistance configuration matched somebody with somebody when printed board plant-grid connection area is in power cathode incoming end, plant-grid connection area set altogether a, Tri- binding posts of b and d or pad, the resistance matched somebody with somebody are RA, and two terminals is connected with terminal or pad b and d respectively； At least equipped with three terminals or pad a, b in terminal A, terminal B, tri- binding posts of terminal D, with plant-grid connection area on support Accordingly it is attached with wire with d；The dc source that outside is come can power through terminal A and terminal B to transmitter, also can be through end Sub- A and terminal D power to transmitter makes its work, and terminal A is the positive pole incoming end of power supply, and terminal B and terminal D is negative for power supply Pole incoming end.

The beneficial effects of the utility model are：When externally fed power supply or loop are through terminal C（Positive source）With terminal B （Power cathode）Or terminal A（Positive source）With terminal D（Power cathode）When being powered to transmitter, the logical of transmitter is can ensure that The test pencil for interrogating setting apparatus can be directly hung on terminal A and B, so that it may realize the communications exchange data of setting apparatus and transmitter, and nothing Need to take out stitches, connect the operations such as provisional resistance and wiring, be greatly improved debugging efficiency.

Brief description of the drawings

The utility model is described further with reference to the accompanying drawings and examples.

Fig. 1 is the transmitter power supply interface graph of a relation of the utility model one embodiment.

Fig. 2 is the transmitter power supply interface graph of a relation of second embodiment of the utility model.

Fig. 3 is that the relevant device connection of being powered by pure power supply when being configured of the transmitter with conventional electron interface arrangement is closed System's figure.

Fig. 4 is related equipment connecting relation figure when the transmitter with conventional electron interface arrangement is debugged.

Fig. 5 is relevant device connection when the transmitter with second embodiment interface device of the utility model is debugged Graph of a relation.

Fig. 6 is that the transmitter with second embodiment interface device of the utility model is only powered, is not connected To measuring loop, it is simple be configured when related equipment connecting relation figure.

1. transducer signal receiver in figure, 2. receiver current signal sampling resistor RD, 3. transmitter setting apparatus test pencil Press from both sides, 4. terminal A, 5. support, 6. terminal B, 7. terminal D, 8. terminal or pad a, 9. terminal or pad b, 10. resistance RA, 11. prints Making sheet, 12. terminals or pad d, 13. transmitters, 14. transmitter setting apparatus, 15. dc sources, 16. resistance RC, 17. printed boards Plant-grid connection area, 18. printed board functional task areas, 20. resistance RB, 22. terminals or pad c, 27. terminal C.

Specific embodiment

Fig. 1 represents a kind of transmitter interface device that the utility model is provided, in the electricity in the plant-grid connection area 17 of printed board 11 Source positive pole incoming end configures the resistance RB20 of 200 Ω or 250 Ω, and plant-grid connection area 17 sets c22, a8 and b9 tri- and connects altogether Line terminals or pad, two terminals of resistance RB20 are connected with terminal or pad c22 and a8 respectively；It is furnished with support 5 Three terminals or pad c22, a8 and b9 in tri- binding posts of C27, A4, B6, with plant-grid connection area 17 accordingly use wire It is attached；The dc source that outside is come can power through terminal C27 and terminal B6 to transmitter, also can be through terminal A4 and terminal B6 Being powered to transmitter makes its work, and terminal C27 and terminal A4 is the positive pole incoming end of power supply, and terminal B6 is accessed for the negative pole of power supply End.

Fig. 2 represents another transmitter interface device that the utility model is provided, in the plant-grid connection area 17 of printed board 11 Power cathode incoming end configures the resistance RA10 of 200 Ω or 250 Ω, and plant-grid connection area 17 sets a8, b9 and d12 tri- altogether Binding post or pad, two terminals of resistance RA10 are connected with terminal or pad b9 and d12 respectively；It is furnished with support 5 Three terminals or pad a8, b9 and d12 in tri- binding posts of A4, B6, D7, with plant-grid connection area 17 are accordingly entered with wire Row connection；The dc source that outside is come can power through terminal A4 and B6 to transmitter, can also be supplied to transmitter through terminal A4 and D7 Electricity makes its work, and A4 is the positive pole incoming end of power supply, and B6 and D7 is the negative pole incoming end of power supply.

In fig. 1 and 2, the nominal power of resistance RB20 or R110 is no more than 0.5W, and 0.25W can meet needs.In work( Can mission area 18 be furnished with pad V+ and V-, terminal or pad a8 be connected with pad V+ by printed board cabling, terminal or pad b9 It is connected by printed board cabling with pad V-, functional task area 18 obtains working power whereby, and exports big with surveyed physical quantity The current signal of small proportional relation or other corresponding relations.

Fig. 3, represents the transmitter 13 with conventional electron interface arrangement by a powered operation of pure dc source 15, with setting When determining device 14 and being configured, required wiring relation between the relevant device of presentation, now, system does not possess signal measurement sampling work( Energy.In order to realize the digital communication between setting apparatus and transmitter, need to concatenate an electricity of 250 Ω in the current supply circuit of transmitter Resistance RC16, you can be serially connected in the negative pole circuit of current supply circuit, can also be serially connected in positive pole circuit, what is represented in Fig. 3 is that string exists In negative pole circuit.

What Fig. 4 was represented is：Transmitter 13 with conventional electron interface arrangement accesses supplying measure loop in application places In, and present the wiring relation of related equipment room when being debugged to it with setting apparatus 14.It is used to access electricity on terminal support 5 The terminal in source only has two terminal A4 and B6, A are positive pole, and B is negative pole.For the purposes of realizing the number of setting apparatus 14 and transmitter 13 Word is communicated, it is necessary to the resistance in supplying measure loop is at least 250 Ω, and transducer signal receiver 1 is in actual measurement in Fig. 4 Or generally distributor, computer AD numbers adopt the modules such as card, feed isolation signals module in control system.This kind of module is in it There is a current signal sampling resistor RD2 in portion, and most is 250 Ω；By this 250 Ω current signal sampling resistor RD2, The digital communication test pencil 3 of setting apparatus 14 is directly hung on support A4, B6 terminal of transmitter 13, is not required to separately concatenate other in the loop Resistance RC16, so that it may the digital communication between setting apparatus 14 and transmitter 13 is realized, so that real with setting apparatus 14 without substantial effort Now to the setting or debugging of transmitter 13.But the integrated level of the feed isolation signals module for occurring in recent years becomes more and more higher, The resistance of its current signal sampling resistor RD2 only has 50 Ω；This situation just need to separately go here and there in the supplying measure loop of transmitter 13 Enter a resistance RC16 for being at least 200 Ω, just can guarantee that setting apparatus 14 can carry out reliable digital communication with transmitter 13.When To having accessed the transmitter 13 in actual measurement or control system loop, when the end of transmitter 13 is debugged to it, just need By one in power supply line, positive pole, negative pole are pulled down, by a resistance at least from support terminal A4 or B6 terminal For an end of 200 Ω resistance RC16 is connected on the terminal A4 or B6 for pulling down line, then will pull down again line joint and this The other end of individual resistance RC16 is connected, and at this moment the test pencil 3 of setting apparatus 14 hangs over and can make setting apparatus on A4, B6 terminal of support 5 14 carry out communication with transmitter 13 realizes debugging function.After debugging is finished, then resistance RC16 is pulled down, by the power supply of transmitter 13 Wiring recovers as former state.Take out stitches like this, wiring process can lose time very much, when the transmitter 13 for there are many such situations is needed When being debugged, many human costs can be consumed；Become more and more expensive today in China's human cost, this situation is difficult to allow people Receive.

What Fig. 5 was represented is：Transmitter with the utility model interface device accesses supplying measure in application places In loop, and present the wiring relation of related equipment room when being debugged to it with setting apparatus.

The current signal sampling of the transducer signal receiver 1 of measurement end in measurement or control system loop is known in advance Resistance RD2 is not less than the Ω of nominal value 250, in the initial installation wiring of transmitter 13, will just measure the negative line of current supply circuit It is connected on the terminal B6 of transmitter mount 5；And ought in advance know the current signal sampling resistor RD2 of transducer signal receiver 1 Resistance be significantly less than 250 Ω, in the initial installation wiring of transmitter 13, just by measure current supply circuit negative line be connected to change Send on the terminal D7 of device support 5.Under both situations above, support 5 can be directly articulated in by the test pencil 3 of setting apparatus 14 On terminal A4 and B6, the setting and debugging of transmitter 13 are realized.Latter is to make use of the inside printed board 11 of transmitter 13 The resistance RA10 of upper additional configuration realizes the digital communication function between setting apparatus 14 and transmitter 13, it is to avoid conventional as only having The transmitter 13 of interface device need to be taken out stitches like that, the trouble of wiring, save human cost.RA10 resistances it is nominal Value can be 200 Ω or 250 Ω, and the maximum operating currenbt of transmitter is 20mA, and power consumption is 0.08W when resistance RA10 is 200 Ω, Power consumption is 0.1W during 250 Ω.If minding the limited power consumptions of resistance RA10, then for the initial wiring of transmitter 13 Latter, after the debugging of transmitter 13 is finished, can be by from the negative terminal outside transmitter 13 from the terminal D7 of support 5 On change onto terminal B6.The resistance of other R110 can select 200 Ω, be to be connected to actual measurement current supply circuit based on transmitter 13 When middle, it is 50 Ω that general minimum current signal uses resistance RD2, and the two is added up just up to 250 Ω, can realize setting apparatus 14 With the reliable communicating function between transmitter 13.

The use process description of Fig. 5 and its subsequent the utility model scheme, is with second of the utility model scheme Description is illustrated based on embodiment hardware configuration, the application of corresponding one embodiment is also same using process 's.

What Fig. 6 was represented is：Transmitter with second embodiment interface device of the utility model is only powered, not Related equipment connecting relation figure when being connected to measuring loop, being configured merely.

Due in pure current supply circuit, only dc source 15 is powered for transmitter 13, does not carry out signal acquisition, nothing Sampling resistor RD2 is available, and the digital communication between setting apparatus 14 and transmitter 13 is realized in assistance.Can only be now by electricity in loop The negative pole of source line is connected on terminal D7, and setting apparatus are realized using the resistance RA10 of additional configuration in the inside printed board 11 of transmitter 13 Digital communication function between 14 and transmitter 13, if the resistance of the resistance RA10 of configuration is 200 Ω rather than 250 Ω, then be Ensure the reliability of communication, it is 50 Ω resistance that another nominal value need to be also concatenated in current supply circuit transmitter 13 outside RC16, you can be serially connected in the negative pole circuit of current supply circuit, can also be serially connected in positive pole circuit, and what is represented in Fig. 6 is that string is being born In polar curve road, this kind of debugging application scenarios that set are of little use in practice.

Claims (4)

1. a kind of transmitter interface device, it is main by printed board (11), for fixed printed board and fixed straight in its enclosure interior Support (5) composition of power supply interface terminal is flowed, the interface arrangement of the transmitter is characterized in：Printed board design when, its element Arrangement is logically divided into two regions, and one is functional task area (18) for completing real work task, and another is Plant-grid connection area (17) for accessing power supply；It is furnished with terminal or pad c in plant-grid connection area (17)（22）, terminal or pad a（8）, terminal or pad b（9）And resistance RB（20）Or equipped with terminal or pad a（8）, terminal or pad b（9）、d（12）And Resistance RA（10）；In functional task area（18）Equipped with pad V+ and V-；Terminal or pad a (8) and pad V+ are walked by printed board Line is connected, and terminal or pad b (9) are connected with pad V- by printed board cabling；Resistance RB（20）Two terminals, by print Making sheet cabling respectively with terminal or pad c（22）With terminal or pad a（8）Connection, resistance RA（10）Two terminals, pass through Printed board cabling respectively with terminal or pad b（9）And d（12）Connection；Functional task area（18）Work is accessed by pad V+ and V- Make power supply, V+ is positive source incoming end, and V- is power cathode incoming end；The support (5) of transmitter is provided with three for pick-up Device and the outside terminal being attached, these three terminals are respectively terminal C（27）, terminal A（4）, terminal B（6）Or end Sub- A（4）, terminal B（6）, terminal D（7）；Terminal A（4）With terminal or pad a（8）Connected with wire, terminal B（6）With terminal or Pad b（9）Connected with wire, terminal C（27）With terminal or pad c（22）Connected with wire, terminal D（7）With terminal or pad d （12）Connected with wire.

2. transmitter interface device according to claim 1, it is characterized in that：Printed board（11）Plant-grid connection area（17）Upper institute The resistance RB for matching somebody with somebody（20）, two terminals respectively with terminal or pad c（22）With terminal or pad a（8）It is connected；Support （5）On at least be furnished with terminal C（27）, terminal A（4）, terminal B（6）Three binding posts, the dc source that outside is come can be through terminal C（27）With terminal B（6）Powered to transmitter, also can be through terminal A（4）With terminal B（6）Being powered to transmitter makes its work, terminal C（27）With terminal A（4）It is the positive pole incoming end of power supply, terminal B（6）It is the negative pole incoming end of power supply.

3. transmitter interface device according to claim 1, it is characterized in that：Printed board（11）Plant-grid connection area（17）Upper institute The resistance matched somebody with somebody is RA（10）, two terminals respectively with terminal or pad b（9）And d（12）It is connected；Support（5）On at least Equipped with terminal A（4）, terminal B（6）, terminal D（7）Three binding posts, the dc source that outside is come can be through terminal A（4）And terminal B（6）Powered to transmitter, also can be through terminal A（4）With terminal D（7）Being powered to transmitter makes its work, terminal A（4）It is power supply Positive pole incoming end, terminal B（6）With terminal D（7）It is the negative pole incoming end of power supply.

4. transmitter interface device according to claim 1, it is characterized in that：Printed board (11) plant-grid connection area（17）Upper institute The resistance RB for matching somebody with somebody（20）Or RA（10）Resistance be 200 Ω or 250 Ω, resistance RB（20）Or RA（10）Power nominal value No more than 0.5W.