CN103984279B - Mixed signal experiment module based on PLC - Google Patents
Mixed signal experiment module based on PLC Download PDFInfo
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Abstract
The invention discloses a kind of mixed signal experiment module based on PLC, including pcb board, PLC and PLC analog quantity spread module；Pcb board includes DC DC circuit, signal feeding and controlled device circuit, digital signal imput output circuit, decoding is latched and digital-scroll technique circuit, pcb board input/output interface, the first terminal row and the second terminal block；PLC includes power circuit, PLC input/output interface and CPU；PLC analog quantity spread module includes PLC analog quantity spread module input/output interface；Digital signal imput output circuit, decoding latch and digital-scroll technique circuit is all connected with PLC input/output interface by the first terminal row with pcb board input/output interface, and signal feeding and controlled device circuit are connected with PLC analog quantity spread module input/output interface by the second terminal block.The present invention has low cost, input/output interface is general, flexible and convenient to use, take the feature that PLC resource is few, convenient teaching, has a good application prospect.
Description
Technical field
The present invention relates to a kind of mixed signal experiment module based on PLC, belong to Programmable Logic Controller teaching technique field.
Background technology
In college teaching, PLC application technology is the technology specialty course that a practicalness is stronger, and in the urgent need to theory and practice being combined, therefore, PLC experiment is the important step of PLC teaching.At present, PLC experiment module is typically single-minded functional experiment module, such as, measurement and control of temperature, digital output modul and some other process simulation amount Control release module, often doing a kind of experiment, need to change a kind of experiment module, cost is high, in-convenience in use, when analog quantity and digital quantity signal are tested by needs simultaneously, in prior art, digital quantity and the single experiment module of analog quantity is needed to be combined, design complexity, expensive.
Further, in prior art, along with remodeling and the upgrading of PLC, experimental provision originally is scrapped the most therewith, causes unnecessary waste.
Therefore, on the one hand PLC and application technology constantly develop, the problem that existing PLC experimental provision exists is more and more prominent, on the other hand, school is also impossible to update frequently experimental provision, under this background, how to give full play to the effect of existing PLC experimental provision, developing general mixed signal experiment module based on PLC is current urgent problem.
Summary of the invention
It is an object of the invention to the deficiency overcoming prior art to exist, the mixed signal experiment module based on PLC of the present invention, can realize the closed loop control of digital PID based on PLC, multi channel signals observing and controlling, show and report to the police, the experiment such as the Traffic signal control of band countdown, powerful, low cost, input/output interface are general, flexible and convenient to use, take PLC resource few, convenient teaching, have a good application prospect.
In order to achieve the above object, the technical solution adopted in the present invention is:
Mixed signal experiment module based on PLC, including pcb board, PLC and PLC analog quantity spread module.
Pcb board includes DC-DC circuit, signal feeding and controlled device circuit, digital signal imput output circuit, decoding is latched and digital-scroll technique circuit, pcb board input/output interface, the first terminal row and the second terminal block；DC-DC circuit and signal feeding and controlled device circuit, digital signal imput output circuit, decoding is latched and digital-scroll technique circuit, pcb board input/output interface are connected, and signal feeding and controlled device circuit and the second terminal block are connected.
Described PLC includes power circuit, PLC input/output interface, CPU, power circuit is all connected with PLC input/output interface, CPU, and described CPU is connected with PLC input/output interface.
PLC analog quantity spread module includes PLC analog quantity spread module input/output interface.
Digital signal imput output circuit, decoding latch and digital-scroll technique circuit is all connected with PLC input/output interface by the first terminal row with pcb board input/output interface, DC-DC circuit is connected with the power circuit in PLC, DC-DC circuit is powered to all component on pcb board after converting the voltage into, signal feeding and controlled device circuit are connected with PLC analog quantity spread module input/output interface by the second terminal block, and described PLC analog quantity spread module input/output interface is connected with CPU by expansion bus.Realize PLC, pcb board and PLC analog quantity spread module signal transmission and control, for based on PLC bulk testing provide equipment, PLC input and output by the first terminal row extension, it is possible to provide diversified experimental project.Annexation between pcb board and assembly and the assembly of PLC analog quantity spread module of this patent, it is possible to adapt to various PLC, the remodeling of PLC and upgrading, pcb board and PLC analog quantity spread module can continue to use.
Signal feeding and controlled device circuit include that signal feeding module, simulation second order controlled device module, signal feeding module, simulation second order controlled device module are connected with PLC analog quantity spread module input/output interface by the second terminal block.
Signal feeding and controlled device circuit also include simulating PI adjustment module, and simulation PI adjustment module is connected with simulation second order controlled device module by debugging switch, and simulation PI adjustment module is for the result comparison controlled with the digital PID regulation of PLC.Simulation second order controlled device module includes that the first amplifier module, simulation PI adjustment module include the second amplifier module and peripheral cell.
Decoding is latched and digital-scroll technique circuit includes that several latch Coding and driving module and several charactrons, each latch Coding and driving module connects a corresponding charactron respectively, latches Coding and driving module and all connects PLC input/output interface by the first terminal row.
More preferably, latch Coding and driving module and charactron is 4.
Digital signal imput output circuit includes that press button module and light emitting diode, press button module include the switch without self-locking and the switch of band self-locking, and press button module and light emitting diode all connect PLC input/output interface by the first terminal row.Press button module is for simulating different demand signals, when needs simulation short message, is used without the switch of self-locking for simulation short message number, and the switch of band self-locking is used for simulating long signal.
More preferably, power circuit output 24V unidirectional current, 24V voltage is converted to 12V voltage by DC-DC circuit, and DC-DC circuit is the DC-DC change-over circuit of band isolation, reduces the outer signals signal disturbing to this assay device.
nullThe invention has the beneficial effects as follows: the mixed signal experiment module based on PLC that the present invention provides，Utilize the controlled device that amplifier module forms，Realize digital PID closed loop control based on PLC，Simultaneously，Receive the analogue signal from PLC analog quantity spread module，Or utilize the On-off signal of mixed signal tentative module to export，It is capable of on-off model detection and control and the detection of simulation process physical quantity and controls，Annexation between pcb board and assembly and the assembly of PLC analog quantity spread module of this patent，Can adapt to various PLC，After the remodeling of PLC and upgrading，Pcb board and PLC analog quantity spread module can continue to use，Various PLC Control release can be carried out，Low cost、Input/output interface is general、Flexible and convenient to use、Take the feature that PLC resource is few，Convenient teaching，Have a good application prospect.
Further, this patent PLC controls to compare with the result that simulation controls, state modulator arranges flexibly, the Traffic signal control etc. that can also complete multichannel signal observing and controlling and display, band countdown is tested, various teaching that PLC controls can also be met as the detector unit of complex control system and display unit.
Further, the application pcb board is connected with PLC, PLC analog quantity spread module with the second terminal block respectively by the first terminal row, and experimental wiring is convenient clear, facilitates experimental implementation.
Accompanying drawing explanation
Fig. 1 is the structural representation of the mixed signal experiment module based on PLC of the present invention；
Fig. 2 is that the present invention includes the structural representation of assembly in signal feeding and controlled device circuit；
Fig. 3 is that the decoding of the present invention is latched and the circuit theory diagrams of digital-scroll technique circuit.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is further described.
As it is shown in figure 1, mixed signal experiment module based on PLC, including pcb board 1, PLC 2 and PLC analog quantity spread module 3.
Pcb board 1 includes DC-DC circuit 101, signal feeding and controlled device circuit 102, digital signal imput output circuit 103, decoding is latched and digital-scroll technique circuit 104, pcb board input/output interface 105, the first terminal row 106 and the second terminal block 107；Described DC-DC circuit 101 and signal feeding and controlled device circuit 102, digital signal imput output circuit 103, decoding is latched and digital-scroll technique circuit 104, pcb board input/output interface 105 are connected, and described signal feeding and controlled device circuit 102 are connected with the second terminal block 107.
PLC 2 includes power circuit 201 and PLC input/output interface 202, CPU 203, power circuit 201 is all connected with PLC input/output interface 202, CPU 203, and CPU 203 is connected with PLC input/output interface 202.PLC analog quantity spread module 3 includes PLC analog quantity spread module input/output interface 301.
Digital signal imput output circuit 103, decoding is latched and digital-scroll technique circuit 104 is all connected with PLC input/output interface 202 by the first terminal row 106 with pcb board input/output interface 105, DC-DC circuit 101 is connected with the power circuit 201 in PLC 2, DC-DC circuit is powered to all component on pcb board after converting the voltage into, signal feeding and controlled device circuit 102 are connected with PLC analog quantity spread module input/output interface 301 by the second terminal block 107, PLC analog quantity spread module input/output interface 301 is connected with CPU 203 by expansion bus.
As shown in Figure 2, signal feeding and controlled device circuit 102 include that signal feeding module 102a, simulation second order controlled device module 102b and simulation PI adjustment module 102c, signal feeding module 102a, simulation second order controlled device module 102b are connected with PLC analog quantity spread module input/output interface 301 by the second terminal block 107.Simulation PI adjustment module 102c is connected with simulation second order controlled device module 102b by debugging switch, and simulation PI adjustment module 102c is for the result comparison controlled with the digital PID regulation of PLC.
Decoding is latched and digital-scroll technique circuit 104 includes that four are latched Coding and driving module and four charactrons, four are latched Coding and driving module and connect a corresponding charactron respectively, and four are latched Coding and driving module all by the first terminal row 106 connection PLC input/output interface 202.
Digital signal imput output circuit 103 includes four press button modules and 16 light emitting diodes, four press button modules include that two switches without self-locking and the switch of two band self-lockings, four press button modules and 16 light emitting diodes are all by the first terminal row 106 connection PLC input/output interface 202.
Power circuit 201 exports 24V unidirectional current, DC-DC circuit 101 includes LM2596-12 chip and peripheral cell, 24V voltage is converted to 12V voltage by DC-DC circuit 101, the DC-DC change-over circuit that DC-DC circuit 101 is isolated for band, the 24V unidirectional current of PLC is become 12V unidirectional current, more each circuit that the DC-DC module isolated by band is output as on pcb board provides electric energy.
Signal feeding module 102a is simulated 0-5V Setting signal by 12V power supply through potentiometer, connect 1 road input of PLC analog quantity spread module input/output interface 301, 4 railway digital amount inputs in PLC are connect by four key switches, simulation second order controlled device module 102b includes the first amplifier module (model is LM358), simulation second order controlled device module 102b can be connected in order to access control effect with simulation PI adjustment module 102c, simulation PI adjustment module 102c includes the second amplifier module (model is LM358), realize the digital control difference controlled with simulation.
nullAs shown in Figure 3，Described decoding is latched and digital-scroll technique circuit includes that four are latched Coding and driving module U5、U6、U7、U8 (model is CD4511) and four charactron DS1、DS2、DS3、DS4 (can use common cathode charactron)，Four are latched Coding and driving module external PLC input/output interface 202 respectively，And be connected with a corresponding charactron respectively，Concrete connection is as follows，8 railway digital amount output signals of PLC 2 are through electric resistance partial pressure，Wherein 4 tunnel decoded signals connect latch Coding and driving module U5、U6、U7、The input of U8，Other 4 tunnels connect latch Coding and driving module U5 respectively、U6、U7、The latch Enable Pin of U8，Latch Coding and driving module U5、U6、U7、7 sections of output (a of U8、b、c、d、e、f、G) charactron DS1 it is coupled with、DS2、DS3、The corresponding end of DS4.Described digital signal imput output circuit 103 includes 16 paths of LEDs display lamps, wherein 6 groups (12) display lamps connect the other 6 railway digital amount delivery outlets of PLC respectively, 2 groups of (4) display lamps connect the remaining 2 railway digital amount delivery outlets of PLC respectively, that is, 2 groups (4) display lamp CAR-N and S_CAR, CAR-E and W_CAR connect the remaining 2 railway digital amount delivery outlets of PLC respectively.
The mixed signal experiment module work process based on PLC of the present invention is as follows: PLC is as a example by the PLC of siemens PLC, and this experiment module can be as the platform of three model experiments: TT&C system based on PLC, PID closed-loop control system based on PLC, traffic light control system based on PLC.
1, multichannel TT&C system based on PLC: provided two-way simulation actual measurement physical quantity by signal feeding module 102a on pcb board, through PLC analog quantity spread module 3(model EM235) input, compare with interior set-point, output control signal, and the upper lower limit value that can set physical quantity carries out off-limit alarm, realizes the display of actual measurement physical quantity simultaneously.
2, PID closed-loop control system based on PLC: simulation PI adjustment module 102c and simulation second order controlled device module 102b can be connected by the debugging switch on pcb board, the output of simulation second order controlled device module 102b is by PLC analog quantity spread module 3(model EM235) input, set-point is changed, by process and the effect of the display observation PID closed loop regulation of simulated object output by signal feeding module 102a.
3, traffic light control system based on PLC: simulated 12 red, yellow, and green display lamps of cross traffic intersection and the whereabouts state of 4 automobiles at 4 crossings respectively by 16 LED lights on pcb board, being controlled by the digital output mouth of PLC, thing, the traffic control time in north-south can be carried out, by charactron, the display that counts down.
The mixed signal experiment module based on PLC that the present invention provides, utilize the controlled device that amplifier forms, realize digital PID closed loop control based on PLC, and can compare with the result that simulation controls, flexible setting for parameters, the Traffic signal control etc. that can also complete multichannel signal observing and controlling and display, band countdown is tested, can also be as the detector unit of complex control system and display unit, low cost, input/output interface are general, flexible and convenient to use, take the feature that PLC resource is few, convenient teaching, has a good application prospect.
The ultimate principle of the present invention, principal character and advantage have more than been shown and described.Skilled person will appreciate that of the industry; the present invention is not restricted to the described embodiments; the principle that the present invention is simply described described in above-described embodiment and description; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements both fall within scope of the claimed invention.Claimed scope is defined by appending claims and equivalent thereof.
Claims (10)
1. mixed signal experiment module based on PLC, including PLC (2), it is characterised in that: also include pcb board (1) and PLC analog quantity spread module (3)；
Described pcb board (1) includes DC-DC circuit (101), signal feeding and controlled device circuit (102), digital signal imput output circuit (103), decoding is latched and digital-scroll technique circuit (104), pcb board input/output interface (105), the first terminal row (106) and the second terminal block (107)；Described DC-DC circuit (101) and signal feeding and controlled device circuit (102), digital signal imput output circuit (103), decoding is latched and digital-scroll technique circuit (104), pcb board input/output interface (105) are connected；
Described PLC (2) includes power circuit (201), PLC input/output interface (202) and CPU (203)；Power circuit (201) is all connected with PLC input/output interface (202), CPU (203), and described CPU (203) is connected with PLC input/output interface (202)；
Described PLC analog quantity spread module (3) includes PLC analog quantity spread module input/output interface (301)；
Described digital signal imput output circuit (103), decoding is latched and digital-scroll technique circuit (104) is all connected with PLC input/output interface (202) by the first terminal row (106) with pcb board input/output interface (105), described DC-DC circuit (101) is connected with the power circuit (201) in PLC (2), DC-DC circuit (101) is powered to all component on pcb board after converting the voltage into, described signal feeding and controlled device circuit (102) are connected with PLC analog quantity spread module input/output interface (301) by the second terminal block (107), described PLC analog quantity spread module input/output interface (301) is connected with CPU (203).
Mixed signal experiment module based on PLC the most according to claim 1, it is characterized in that: described signal feeding and controlled device circuit (102) include that signal feeding module (102a), simulation second order controlled device module (102b), described signal feeding module (102a), simulation second order controlled device module (102b) are connected with PLC analog quantity spread module input/output interface (301) by the second terminal block (107).
Mixed signal experiment module based on PLC the most according to claim 2, it is characterized in that: signal feeding and controlled device circuit (102) also include simulating PI adjustment module (102c), described simulation PI adjustment module (102c) is connected with simulation second order controlled device module (102b) by debugging switch, and described simulation PI adjustment module (102c) is for the result comparison controlled with the digital PID regulation of PLC.
Mixed signal experiment module based on PLC the most according to claim 1, it is characterized in that: described decoding is latched and digital-scroll technique circuit (104) includes some latch Coding and driving modules and some charactrons, described latch Coding and driving module is all connected with a corresponding charactron, and described latch Coding and driving module all connects PLC input/output interface (202) by the first terminal row (106).
Mixed signal experiment module based on PLC the most according to claim 4, it is characterised in that: described latch Coding and driving module and charactron quantity are 4.
Mixed signal experiment module based on PLC the most according to claim 1, it is characterized in that: described digital signal imput output circuit (103) includes press button module and light emitting diode, described press button module includes the switch without self-locking and the switch of band self-locking, and described press button module and light emitting diode all connect PLC input/output interface (202) by the first terminal row (106).
Mixed signal experiment module based on PLC the most according to claim 1, it is characterised in that: described power circuit (201) output 24V unidirectional current, 24V voltage is converted to 12V voltage by described DC-DC circuit (101).
Mixed signal experiment module based on PLC the most according to claim 1, it is characterised in that: described DC-DC circuit (101) is the DC-DC change-over circuit of band isolation.
Mixed signal experiment module based on PLC the most according to claim 3, it is characterised in that: described simulation second order controlled device module (102b) includes that the first amplifier module, described simulation PI adjustment module (102c) include the second amplifier module.
Mixed signal experiment module based on PLC the most according to claim 1, it is characterised in that: described PLC analog quantity spread module input/output interface (301) is connected with CPU (203) by expansion bus.
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