CN202033663U - Programmable logic controller (PLC) control function detecting system of printed circuit board - Google Patents

Programmable logic controller (PLC) control function detecting system of printed circuit board Download PDF

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Publication number
CN202033663U
CN202033663U CN2011201189968U CN201120118996U CN202033663U CN 202033663 U CN202033663 U CN 202033663U CN 2011201189968 U CN2011201189968 U CN 2011201189968U CN 201120118996 U CN201120118996 U CN 201120118996U CN 202033663 U CN202033663 U CN 202033663U
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CN
China
Prior art keywords
plc
electrically
module
pcb
test
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CN2011201189968U
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Chinese (zh)
Inventor
王艳红
王怀群
张明珠
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王艳红
王怀群
张明珠
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Priority to CN2011201189968U priority Critical patent/CN202033663U/en
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Publication of CN202033663U publication Critical patent/CN202033663U/en

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Abstract

The utility model provides a programmable logic controller (PLC) control function detecting system of a printed circuit board, which is characterized by having a PLC module, wherein the PLC module is electrically connected with a personal computer (PC) module and a display module respectively. The PC module is electrically connected with the display module, the PLC module is electrically connected with a signal generator which is electrically connected with a relay matrix, and the relay matrix is respectively electrically connected with a PLC and a printed circuit board (PCB) under test which is electrically connected with the PLC. By means of flexible configuration of a relay switch matrix without changing any hardware except resetting software, the PLC control function detecting system can realize data acquisition of a plurality of test objects and multi-channel signals, enables the testing system to have a huge expandability, and facilitates on-line design and system maintenance. The combination of the relay switch matrix control technology and the PLC technology provides design thinking for the PCB function testing system developed for the requirement of various and small-lot production.

Description

The PLC control function detection system of printed circuit board (PCB)
Technical field
The utility model relates to electronic device field, and especially design is controlled and the PCB detecting Instrument technology field automatically.
Background technology
Development along with modern electronic technology, the kind of electronic product is increasing, its function is gradually improved, and this makes design as the printed circuit board (PCB) (PCB) of the important component part of modern electronic product become simultaneously and become increasingly complex, also breaks down more and more easily.Because the performance of printed circuit board (PCB) has directly determined the quality of electronic product, so for guaranteeing quality of printed circuits, need the pcb board of electronic components is carried out repeatedly quality testing, examination in time goes out defective PCB product, thereby reduce production costs to greatest extent, and improve the quality of final products.
A kind of prior art that pcb board is carried out quality testing is that a kind of electronic component is installed and used the PCB detecting device, it is installed the bad electronic component that detects of figure in forming each parts of circuit diagram and uses the PCB detecting device, above-mentioned detection device has the bad affirmation device of product, promptly pass through Flame Image Process, above-mentioned parts view data and the test pattern that obtains of making a video recording compared, thereby the bad part of detected circuit diagram is confirmed.The bad affirmation device of the said goods comprises, the demonstration means are promptly taken the view data that draws based on above-mentioned parts are divided the camera watch region that forms, and show the camera watch region that contains the above above-mentioned bad part in a place or a place; Display control means, promptly the camera watch region with contained above-mentioned bad portion size maximum is preferential order, controls above-mentioned camera watch region and is presented at successively in the above-mentioned demonstration means; Input medium, promptly to being presented at the above-mentioned camera watch region in the above-mentioned demonstration means, its above above-mentioned bad part in a place that is included in this camera watch region is that true property is bad, or all above-mentioned bad parts that are included in this camera watch region are virtual bad, differentiate by visual, select input then, determine the result who is drawn.In the demonstration means, be preferential order with the camera watch region of contained bad portion size maximum, show each camera watch region successively.
The pick-up unit of above-mentioned prior art is based on the automated optical detection technique, and its shortcoming comprises: the scolder on the J type pin is not enough, pin breaks away from, and the zone that solder defect occurred can't detect concerning automated optical detection equipment, for example the BGA device; Owing to take the difference of light, comparison chart as the time the inaccurate judgement that causes.In addition, automated optical detects if will obtain reliable test result has many challenges, and these challenges comprise: manufacturer is to the mark on the device, and the difference aspect orientation and check is intricate; Because the formed film of rinse-free flux makes that mark and pad are smudgy; Terminals and the pin overshadowed and oxidation in surface, and because tall and big components and parts have covered the problems such as the visual field of video camera in the marginal portion.Therefore, this detection technique can be used as the method for a kind of effective localization part fault in the PCB testing process, but can not become the whether qualified accurate determination methods of final finished reliably.
The another kind of prior art that pcb board is carried out quality testing is the needle-bar tester, and the needle-bar tester obtains extensive application with its short circuit at a high speed and open test, economic production in enormous quantities cost.For example manufacturing defect analyser (MDA, Manufacturing Defect Analyzer) uses a needle-bar, can then diagnose output.
The needle-bar tester need be produced different templates at different circuit boards, makes and debugging cycle is long, cost is high, so is not suitable for the test of low yield original shape model machine; The test covering power is limited, can only survey short circuit and open defect, can not test the assembling that has shielded; Along with circuit board density is more and more higher, can't measure the too little circuit board of spacing.
The utility model content
The utility model provides a kind of PLC control function detection system of printed circuit board (PCB), and it is at the deficiencies in the prior art part, and purpose is to solve short run, many kinds, the problem of the Function detection of finished printed circuit board product cheaply.
For achieving the above object, the technical solution of the utility model is:
The PLC control function detection system of printed circuit board (PCB), it is characterized in that: have the PLC module, the PLC module is electrically connected respectively with PC module, display module, the PC module is electrically connected with display module, the PLC module is electrically connected with signal generator, and signal generator is electrically connected with relay matrix, and relay matrix is electrically connected with PLC, relay matrix is electrically connected with tested PCB, and tested PCB is electrically connected with PLC.
Native system has the accurate I/O slot of several 48 pin marks, and tested PCB is plugged in respectively in the described slot, and tested PCB is in series with the relay switch plate respectively, and relay matrix is connected with the cascade bus, and the input end of relay switch plate is connected in parallel on the cascade bus.
The usefulness of technique scheme is:
Flexible configuration by means of the relay switch matrix, do not need to change any hardware, only need on software, reset, just can realize the data acquisition of a plurality of tested objects and multiple signals, make test macro have great extensibility, be convenient to online design and system maintenance.In the PCB test macro of the present invention's design, relay switch matrix control technology combines with the PLC technology, for testing circuit board provides general exploitation hardware platform, especially the PCB function test system at required exploitation in multiple class, the small serial production provides mentality of designing.
Description of drawings
Fig. 1 is the utility model theory diagram;
Fig. 2 is the utility model tandem type relay matrix network chart;
Fig. 3 is the multi-path data acquiring system synoptic diagram based on matrix relay of the present utility model.
Embodiment
The utility model now is described in conjunction with the accompanying drawings and embodiments.
On the basis that solid theories is analyzed, the utility model proposes the global design scheme of the fast automatic test macro of finished printed circuit board product, total system is made of the hardware and software two large divisions.Hardware components has adopted the division thought of functional module, the function of the required realization of whole hardware circuit is divided into three big modules, be respectively: the PLC kernel control module, finish the function that communicates and control other two big modules with computer PC, signal generator module, the test circuit in the signal generator can be carried out electrical isolation at different analog elements and be applied test signal and measure response; The relay matrix module, the break-make between control test point and test signal line.Each module not only can have been finished self independently function but also can finish the allomeric function of hardware with other module communication.System software is realized by the PLC program, and is utilized touch screen module operation and display analysis control detection data.
The PCB test macro of the utility model design is given full play to modern electronic technology, computer technology, signal processing technology, System Discrimination and expert system, and adopting with PLC is the system design of control core, thereby realizes low-cost, high efficiency stable detection.
As shown in Figure 1, the PLC module is electrically connected respectively with PC module, display module, the PC module is electrically connected with display module, the PLC module is electrically connected with signal generator, signal generator is electrically connected with relay matrix, relay matrix is electrically connected with PLC, and relay matrix is electrically connected with tested PCB, and tested PCB is electrically connected with PLC.
At first on PC, set up relevant application software, connect the PLC module by data line and interface circuit, finish and be PLC input initialization program, and can carry out communication with it, on the touch-screen of display module, realize oscillographic display effect, do various mathematics manipulation etc. by the PLC control-signals generator and to image data.During test, provide digital signal by testing software by PLC by the programmer, being converted to the required analogue stimulus signal of test through D/A is applied on the test circuit on the signal generator, deliver on the relay matrix by test bus again, relay matrix links to each other with PLC and is turn-offed by the conducting of PLC pilot relay, tested PCB is fixed in the tester, pumping signal is applied on the relevant position of tested PCB by bus and relay matrix, again the response simulation amount that collects is sent into the A/D conversion, obtain the corresponding digital amount, whether handle judgement PCB by PLC qualified, and by with the communication of touch-screen, result of determination is presented at forms friendly man-machine interface on the touch-screen.
As shown in Figure 3, four the 48 accurate I/O slots of pin mark on tester, have been designed, offer four dissimilar detected PCB circuit boards: first guide plate, control panel, current detecting plate, voltage tester plate, carry out simultaneously the circuit functionality detection successively by the corresponding back of inserting of I/O socket, improved detection efficiency greatly.The signal generator module is as the device that test resource is provided, 4 kinds of signals that exportable voltage magnitude is adjustable: single-phase AC signal, three-phase ac signal, triangular signal, square-wave signal are as the analog quantity test signal, utilize+/-15V and+/-the 24V direct supply, regulate level by electrical equipment position device and obtain digital quantity " 0 "/" 1 " test signal, more than 8 kinds of signals altogether.Then, 8 kinds of signal sources need make up ordering by the input requirement of tested PCB circuit board, import 4 road signals to tested PCB successively again.For satisfying the requirement that this moment, the large scale test signal switched, the relay matrix of signal generator module utilization connection 8 * 4 can be realized.
Because the numbering with the input/input pin of its socket of variation of tested PCB also may will change thereupon, the PCB test platform that needs exploitation to have certain versatility avoids changing the variation that the test board hardware circuit connects.Find by analysis test resource, input/output signal pin four road is continuous, the utility model proposes tandem type relay Control Network form, make that the control of test macro is more economical, flexibly, as shown in Figure 2: by guide's partitioned signal of relay matrix output, the control panel signal, the electric current plate signal, the voltage partitioned signal is input on the cascade bus, the relay switch plate 1 of connecting with first guide plate, the relay switch plate 2 of connecting with control panel, the relay switch plate 3 of connecting with the current detecting plate, the relay switch plate 4 of connecting with the voltage tester plate, more than the input end of 4 relay switch plates be connected in parallel on the cascade bus.Like this, the signal generator module is controlled by the tandem type relay network, is distributed to the test signal of the different pin required inputs of each Board Under Test by the cascade bus.Tandem type relay Control Network adopts the control forms that relay switch plate control input end is in parallel to make output terminal form the switch combination of tandem type.
When the PCB function test system is developed, at first tackle each I/O mouth signal resource of circuit board of being tested and analyze.In the utility model, be example with four blocks of circuit-under-test plates, as shown in table 1 to its pin information statistics.3 row's stitch row of 48 pin pin sockets number are marked by d, b, z.Find in the experiment, if the corresponding insertion sequence of tested circuit board is made mistakes then operation function test procedure failure.Thereby the utility model adopts idle stitch short circuit identification method to judge the test circuit board type, as the pin b14 and the z14 short circuit of first guide plate in the table.Know that by statistics the digital-to-analog amount input of every test board is respectively 12 tunnel acquired signal with output.By analyzing and rationally arranging,, institute is surveyed parameter be assigned in each flow process as far as possible according to test condition configuration testing flow process.Gather 4 road signals in the single testing process simultaneously, signal frequency belongs to low frequency, selects 4 road A/D passages, single-point grounding method for use, avoids bringing the loop coupled noise.The employing differential mode is gathered, and promptly uses high/low two-wire transmission signals, and topological structure is that the matrix switch of 4x12 two-wire system can satisfy the Test Switchboard resource requirement.
Information Statistics of table 1 test pin and processing
The structure of the PCB function test system of the utility model design is the multi-path data acquiring system based on matrix relay as shown in Figure 3.8 kinds of power supply signal test resources that PLC sends: power supply signal 1, power supply signal 2, power supply signal 3, power supply signal 4, power supply signal 5, power supply signal 6, power supply signal 7,8 set adapter circuits of power supply signal 8 (omission is arranged among the figure) process signal generator: adapter circuit 1, adapter circuit 2, adapter circuit 3, adapter circuit 4, adapter circuit 5, adapter circuit 6, adapter circuit 7, behind the adapter circuit 8 (omission is arranged among the figure), control by the PLC software program, relay matrix respective switch action by delivery outlet Q1.0~Q1.7 driving 8 * 4, (tested test plate (panel) has 4, first guide plate as shown in Figure 2 to obtain each tested test plate (panel), control panel, the current detecting plate, the voltage tester plate) required test signal sequence.Because test process needs a plurality of flow processs, the signal that needs in the different testing processs to gather also is different, is example with synchronous acquisition 4 road signals, promptly need gather 4 tunnel different power supply signals constantly with as the input signal that is applied to Board Under Test in difference.Relay matrix for 8 * 4, with 8 road signals as input, with 4 road signals as output, by the software setting matrix, do not need to change any hardware, just can reach 70 kinds of different testing power supply signal combination, realize the switching of multiple signals and the independent assortment of varying input signal.
The signal generator module provides the input signal test resource for the unit under test among the PCB, comprising analog signals, selects the controlled sine wave signal 0-100mv of three-phase alternating current for use, 50HZ; Digital quantity signal " 0 ", " 1 ", select for use potentiometer regulate varying level standard+24V/6V ,+15V/8V.
Output Q2.0~Q2.7 of PLC is in order to the relay assembly switch motion in cascaded relay switch plate 1, relay switch plate 2, relay switch plate 3, the relay switch plate 4 (omission is arranged among the figure), and the output signal of tested PCB circuit board is gathered by the A/D module of EM231 four tunnel analog quantitys input.After PLC collects the output signal of PCB, carry out data processing, export each signal analysis judged result to display screen by PLC delivery outlet I0.0~I0.3.As can be seen, flexible use by relay matrix, solved and changed the troublesome problem that I/O mouth and signal resource and controller corded variations bring behind the circuit-under-test plate in the PCB test, the connection of relocating of the signal of minimizing test macro has improved the versatility of test macro.
The utility model is found in the circuit design experiment, when PLC drives the horizontal bus of certain bar as defeated signal wire when unsettled, need series diode behind relay switch, to separate the problem that must not realize corresponding control to the output signal of vertical bus by relay switch.
Flexible configuration by means of the relay switch matrix, do not need to change any hardware, only need on software, reset, just can realize the data acquisition of a plurality of tested objects and multiple signals, make test macro have great extensibility, be convenient to online design and system maintenance.In the PCB test macro of the present invention's design, relay switch matrix control technology combines with the PLC technology, for testing circuit board provides general exploitation hardware platform, especially the PCB function test system at required exploitation in multiple class, the small serial production provides mentality of designing.
The utility model detects suitable at the PCB of the manufacturing enterprise of a large amount of small-sized electronic product of China.Through investigation checking, because its printed circuit board (PCB) quantity of being processed in manufacture course of products is little relatively, but the printed circuit board (PCB) of exploitation is various in style, for the adaptation to market variations Product Renewal also very fast.Consider the cost problem, the unable input substantial contribution of miniature electric enterprise is tightly checked and is handled the fault that occurs in the whole printed circuit board (PCB) process of manufacture, thereby is reluctant to provide funds to buy special-purpose large-sized print circuit board detecting analytical instrument.In this case, cover high-performance, a low price, detection finished product auto testing instrument fast, convenient, flexible, printed circuit board (PCB) with certain versatility will bring considerable economic.
For the demonstration of test result and analysis result, also touch-screen can be reelected with computing machine and show to replace, but bring computing machine to be equipped with simultaneously and the problem of the whole mobility difference of testing tool, dirigibility reduces.

Claims (2)

1. the PLC control function detection system of printed circuit board (PCB), it is characterized in that: have the PLC module, the PLC module is electrically connected respectively with PC module, display module, the PC module is electrically connected with display module, the PLC module is electrically connected with signal generator, and signal generator is electrically connected with relay matrix, and relay matrix is electrically connected with PLC, relay matrix is electrically connected with tested PCB, and tested PCB is electrically connected with PLC.
2. the PLC control function detection system of printed circuit board (PCB) as claimed in claim 1, it is characterized in that: have the accurate I/O slot of several 48 pin marks, tested PCB is plugged in respectively in the described slot, tested PCB is in series with the relay switch plate respectively, relay matrix is connected with the cascade bus, and the input end of relay switch plate is connected in parallel on the cascade bus.
CN2011201189968U 2011-04-21 2011-04-21 Programmable logic controller (PLC) control function detecting system of printed circuit board CN202033663U (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102495554A (en) * 2011-11-22 2012-06-13 苏州凌创电子科技有限公司 Program controlled matrix switch and manufacturing method thereof
CN102590730A (en) * 2012-01-16 2012-07-18 中冶南方(武汉)自动化有限公司 Modularized open PCBA (Printed Circuit Board Assembly) functional circuit test platform, system and method
CN103019110A (en) * 2012-08-23 2013-04-03 中国电子科技集团公司第四十一研究所 Intelligent control system for modular switch
CN103676928A (en) * 2013-11-12 2014-03-26 陕西国力信息技术有限公司 AMT system clutch CPU function detection method
CN103970112A (en) * 2013-01-29 2014-08-06 北京金奔腾汽车科技有限公司 Automobile computer diagnostic instrument capable of automatically switching channel diagnosis
CN104199364A (en) * 2014-09-15 2014-12-10 格力电器(武汉)有限公司 Display panel test system
CN104678276A (en) * 2013-11-28 2015-06-03 英业达科技有限公司 Modularized chip multiple-pin simultaneous test system and method thereof
CN105717832A (en) * 2016-01-27 2016-06-29 系新电子技术(苏州)有限公司 Control system of ICT test tool
CN106708156A (en) * 2016-12-19 2017-05-24 南京三光电科技有限公司 Alternating current-direct current power source system based on PLC control and control method
TWI647554B (en) * 2018-02-09 2019-01-11 凱立自動化有限公司 Tandem signal transmission control module

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102495554A (en) * 2011-11-22 2012-06-13 苏州凌创电子科技有限公司 Program controlled matrix switch and manufacturing method thereof
CN102590730A (en) * 2012-01-16 2012-07-18 中冶南方(武汉)自动化有限公司 Modularized open PCBA (Printed Circuit Board Assembly) functional circuit test platform, system and method
CN103019110A (en) * 2012-08-23 2013-04-03 中国电子科技集团公司第四十一研究所 Intelligent control system for modular switch
CN103019110B (en) * 2012-08-23 2015-08-05 中国电子科技集团公司第四十一研究所 The intelligent control system of modular switch
CN103970112A (en) * 2013-01-29 2014-08-06 北京金奔腾汽车科技有限公司 Automobile computer diagnostic instrument capable of automatically switching channel diagnosis
CN103676928A (en) * 2013-11-12 2014-03-26 陕西国力信息技术有限公司 AMT system clutch CPU function detection method
CN103676928B (en) * 2013-11-12 2018-11-02 陕西国力信息技术有限公司 A kind of function detecting method of AMT system clutch CPU
CN104678276A (en) * 2013-11-28 2015-06-03 英业达科技有限公司 Modularized chip multiple-pin simultaneous test system and method thereof
CN104199364A (en) * 2014-09-15 2014-12-10 格力电器(武汉)有限公司 Display panel test system
CN105717832A (en) * 2016-01-27 2016-06-29 系新电子技术(苏州)有限公司 Control system of ICT test tool
CN106708156A (en) * 2016-12-19 2017-05-24 南京三光电科技有限公司 Alternating current-direct current power source system based on PLC control and control method
CN106708156B (en) * 2016-12-19 2017-11-24 南京三一光电科技有限公司 A kind of power of alterating and direct current system and control method based on PLC controls
TWI647554B (en) * 2018-02-09 2019-01-11 凱立自動化有限公司 Tandem signal transmission control module

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GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20111109

Termination date: 20120421