CN102854835B - PLC (Programmable Logic controller)-based digital signal collection board card with isolation function - Google Patents
PLC (Programmable Logic controller)-based digital signal collection board card with isolation function Download PDFInfo
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Abstract
The invention discloses a PLC (Programmable Logic controller)-based digital signal collection board card with an isolation function. The board card comprises an isolation protection circuit, a PLC end input interface J1, an external negative signal end input interface J2 and an external positive signal end input interface J3, wherein the isolation protection circuit is correspondingly connected with the PLC end input interface J1 and the external negative signal end input interface J2. By manufacturing the digital signal collection board card, the electric isolation between a digital signal and a PLC module is realized, thus protecting the PLC module; by utilizing an IN4007, the alternating current protection of field sensor signal collection is realized; and by manufacturing a PCB (Printed Circuit Board), an installation space is reduced, the complex wiring work for an intermediate link in the conventional process is also saved, and the communication can be realized only needing to finish the wiring between the PCB and a realistic grade as well as between the PCB and a PLC end, thus greatly improving the working efficiency.
Description
Technical field
The invention belongs to the switching value Technique of Input Process field in robotization control, relate to a kind of digital signal acquiring board based on the isolation of PLC band.
Background technology
There is variation with rapid changepl. never-ending changes and improvements in modern science and technology, the control of equipment is pursued to robotization, intellectuality, on-site signal that need to be a large amount of to controlled device collection, the conventional collection that has the digital quantities such as various pressure switch signals, travel switch signal, approach switch signal.Particularly, at industrial circle, modularization, the strong PLC of dirigibility are widely adopted, and need a large amount of digital signal of collection site, are equipped with multiple multichannel digital signal acquiring modules.
The way extensively adopting is at present to select a large amount of connection terminals, wire casing, guide rail to realize wiring to install, hardware cost is high, and the installing space taking is large, has virtually increased volume, weight and the floor area of switch board, particularly for ocean platform, an inch of land is an inch of gold, reduces the target that floor area and weight are its pursuits, simultaneously because signalling channel is many, wiring is complicated, not attractive in appearance, maintenance and inspection inconvenience, Installation and Debugging maintenance efficiency is low.
Summary of the invention
The object of this invention is to provide a kind of digital signal acquiring board based on PLC band isolation, solved in prior art because signal sampling channel is many, the problem that wiring complexity, Installation and Debugging maintenance efficiency be low, take up room greatly, not attractive in appearance, maintenance and inspection are inconvenient.
The technical solution adopted in the present invention is; a kind of digital signal acquiring board based on the isolation of PLC band; comprise isolation protective circuit, PLC end input interface J1, outside negative signal end input interface J2 and outside positive signal end input interface J3, isolation protective circuit and PLC end input interface J1, the corresponding connection of outside negative signal end input interface J2.
The invention has the beneficial effects as follows, this analog input card has been realized electrical isolation on-the-spot and PLC controller, and isolation voltage, up to 1000V, is effectively protected PLC module, and harmonics prevents that inverse current from causing false triggering; Can reduce installing space, alleviate the workload that wiring personnel are installed, improve Installation and Debugging work efficiency, reduce the size of control box, reduce and become to produce cost, can expand by multiple boards, use flexibly.
Accompanying drawing explanation
Fig. 1 is the integrated circuit block diagram that the present invention is based on the digital signal acquiring board of PLC band isolation;
Fig. 2 is the schematic diagram of the isolation protective circuit 1 in apparatus of the present invention;
Fig. 3 is the structural representation of the PLC end input interface J1 in apparatus of the present invention;
Fig. 4 is the structural representation of the outside negative signal end input interface J2 in apparatus of the present invention;
Fig. 5 is the structural representation of the outside positive signal end input interface J3 in apparatus of the present invention.
In figure, 1. isolation protective circuit, 2.PLC digital quantity input module,
In addition, J1 is PLC end input interface, and J2 is outside negative signal end input interface, and J3 is outside positive signal end input interface;
RLY1, RLY2 ... RLY16 represents respectively the disconnecting relay of 16 passages;
24VSPDT represents that relay is standard 24V direct current output type;
D1, D2 ... D32 represents respectively 32 IN4007 diodes;
DI1, DI2 ... DI16 represents respectively the 16 railway digital signal input signals of corresponding PLC;
DIODE is the title that diode is given tacit consent in component library;
Embodiment
With reference to Fig. 1; the present invention is based on the digital signal acquiring board of PLC band isolation; its structure is the pcb board card of standard mode; as shown in dotted line frame; comprise isolation protective circuit 1, PLC end input interface J1, outside negative signal end input interface J2 and outside positive signal end input interface J3, isolation protective circuit 1 and PLC end input interface J1, the corresponding connection of outside negative signal end input interface J2.
PLC end input interface J1 is for being connected with PLC digital quantity input module 2; Outside negative signal end input interface J2 for being connected with gauge tap signal and field level switching value signal simultaneously; Outside positive signal end input interface J3 also for being connected with gauge tap signal and field level switching value signal simultaneously.
Above-mentioned PLC end input interface J1, outside negative signal end input interface J2, outside positive signal end input interface J3 all select pcb board standard line bank, and above-mentioned three interfaces and isolation protective circuit 1 are integrated in the pcb board card (interface card) of standard simultaneously.
PLC end input interface J1 is the connecting interface of pcb board card and PLC digital quantity input module 2; Isolation protective circuit 1 can be realized the electrical isolation between field level switching value signal and PLC digital quantity input module, and harmonics prevents that inverse current from causing the false triggering of signal; The connecting interface that outside negative signal end input interface J2 and outside positive signal end input interface J3 are respectively pcb board card and gauge tap signal and field level switching value signal.
The description of the following structure of the present invention, is that the quantity based on 16 passage embodiment arranges, and in actual use, can realize more multichannel collection by corresponding expansion.
PLC digital quantity input module 2 can be selected the SM321 device of Siemens standard 24VDC input, or other PLC digital quantity input module; Gauge tap signal (or button signal) comprises all kinds of switches, button, and field level switching value signal comprises various pressure switch signals, travel switch signal, approach switch signal.
With reference to Fig. 2; isolation protective circuit 1 comprises 16 REL-MR-24DC/21 relays and 32 corresponding IN4007 diodes; be RLY1 and corresponding D1 and D17, RLY2 and corresponding D2 and D18 thereof thereof ... RLY16 and corresponding D16 and D32 thereof; each group mode of connection and principle are consistent, below are illustrated as an example of RLY1 and D1 thereof and D17 and RLY2 and D2 thereof and D18 example respectively:
What RLY1 selected is with a normally closed relay in Lu Changkai He Yi road, the two ends of diode D1 are corresponding connected with the two ends of relay R LY1, the coil-end of the relay R LY1 being connected with diode D1 negative terminal is connected with diode D17 negative terminal, diode D17 is just being connected to No. 1 end (J2-1) of outside negative signal end input interface J2, the coil-end of the relay R LY1 being connected with diode D1 anode and other 15 relay R LY2, RLY3 ... the corresponding end of the coil of RLY16 interconnects successively, and is connected to together No. 17 ends (J2-17) of outside negative signal end input interface J2; The switch-side moving contact end of relay R LY1 and other 15 relay R LY2, RLY3 ... the switch-side corresponding end of RLY16 interconnects successively, and is connected to together No. 1 end (J1-1) of PLC end input interface J1; The switch-side normally opened contact of relay R LY1 is connected to No. 17 ends (J1-17) of PLC end input interface J1;
What RLY2 selected is with a normally closed relay in Lu Changkai He Yi road, the two ends of diode D2 are corresponding connected with the two ends of relay R LY2, the coil-end of the relay R LY2 being connected with diode D2 negative terminal is connected with diode D18 negative terminal, diode D18 is just being connected to No. 2 ends (J2-2) of outside negative signal end input interface J2, the coil-end of the relay R LY2 being connected with diode D2 anode and other 15 relay R LY1, RLY3 ... the corresponding end of the coil of RLY16 interconnects successively, and is connected to together No. 17 ends (J2-17) of outside negative signal end input interface J2; The switch-side moving contact end of relay R LY2 and other 15 relay R LY1, RLY3 ... the switch-side corresponding end of RLY16 interconnects successively, and is connected to together No. 1 end (J1-1) of PLC end input interface J1; The switch-side normally opened contact of relay R LY2 is connected to No. 16 ends (J1-16) of PLC end input interface J1;
RLY3 respectively with D3 and D19 wiring, RLY4 respectively with D4 and D20 wiring ... RLY16 respectively with D16 and D32 wiring, consistent with RLY1 and D1 thereof and D17, RLY2 and D2 thereof and the D18 mode of connection respectively, the rest may be inferred.
With reference to Fig. 3, the structure of PLC end input interface J1 is, have 17 interface end, the positive pole (24VDC) of one termination PLC DC power supply of No. 1 end wherein, another termination 16 relay R LY1, RLY2 ... the switch-side moving contact end of RLY16 interconnect (J1-1) successively, remaining is 17,16 years old ... No. 2 terminated line mode is consistent, below is illustrated as an example of 17, No. 16 terminated lines example:
The 1st tunnel input (DI1) of one termination PLC digital quantity input module 2 of No. 17 ends, the switch-side normally opened contact end (J1-17) of another relay termination RLY1 of No. 17 ends;
The 2nd tunnel input (DI2) of one termination PLC digital quantity input module 2 of No. 16 ends, the switch-side normally opened contact end (J1-16) of another relay termination RLY2 of No. 16 ends; The rest may be inferred.
With reference to Fig. 4, the structure of outside negative signal end input interface J2 is, have 17 interface end, the public negative pole (0VDC) of one termination PLC DC power supply of No. 17 ends wherein, RLY1, RLY2 that another termination of No. 17 ends is connected with diode D16 anode ... the coil-end (J2-17) of RLY16 relay, remaining is 1,2 years old ... No. 16 terminated line mode is consistent, below is illustrated as an example of 1, No. 2 terminated line example;
One termination first via gauge tap signal of No. 1 end or the negative signal end (signal 1-) of field level switching value signal, another terminating diode D17 anode (J2-1) of No. 1 end;
One termination the second way control switch signal of No. 2 ends or the negative signal end (signal 2-) of field level switching value signal, another terminating diode D18 anode (J2-2) of No. 2 ends; The rest may be inferred.
With reference to Fig. 5, the structure of outside positive signal end input interface J3 is, have 17 interface end, the 24V end (24VDC) of one termination 24V direct current industrial power of No. 17 ends wherein, the other end of No. 17 ends and other 1,2 ... No. 16 corresponding end interconnects successively, remaining is 1,2 years old ... No. 16 terminated line mode is consistent, below is illustrated as an example of 1, No. 2 terminated line example:
One termination first via gauge tap signal of No. 1 end or the positive signal end (signal 1+) of field level switching value signal, 2,3 of the other end of No. 1 end and J3 interface ... No. 17 corresponding end interconnects successively;
One termination the second way control switch signal of No. 2 ends or the positive signal end (signal 2+) of field level switching value signal, 1,3 of the other end of No. 2 ends and J3 interface ... No. 17 corresponding end interconnects successively; The rest may be inferred.
The present invention is based on the PLC control system extensively adopting at present and design, design a kind of digital signal acquiring board based on the isolation of PLC band, while gathering a large amount of digital quantity to solve, wiring complexity, take up room large, the inefficient problem of Installation and Debugging, application REL-MR-24DC/21 has realized the electrical isolation between digital signal and PLC module, protection PLC module; Utilize IN4007 to realize the harmonics of spot sensor signals collecting; Reduce installing space by making PCB circuit board, and saved the complicated wiring work of intermediate link in conventional procedure, only need to complete pcb board and can realize communication with reality level and PLC terminated line, greatly improved work efficiency.Solved while gathering a large amount of digital quantity input, wiring complexity, takes up room large, the inefficient problem of Installation and Debugging.
Claims (4)
1. the digital signal acquiring board based on the isolation of PLC band, it is characterized in that: comprise isolation protective circuit (1), PLC end input interface J1, outside negative signal end input interface J2 and outside positive signal end input interface J3, isolation protective circuit (1) and PLC end input interface J1, the corresponding connection of outside negative signal end input interface J2;
Described isolation protective circuit (1) comprises the IN4007 diode of the relay of 16 REL-MR-24DC/21 models and 32 models of correspondence; be RLY1 and corresponding D1 and D17, RLY2 and corresponding D2 and D18 thereof thereof ... RLY16 and corresponding D16 and D32 thereof; each group mode of connection is consistent, below is illustrated as an example of RLY1 and D1 thereof and D17, RLY2 and D2 thereof and D18 example:
What RLY1 selected is with a normally closed relay in Lu Changkai He Yi road, the two ends of diode D1 are corresponding connected with the two ends of relay R LY1, the coil-end of the relay R LY1 being connected with diode D1 negative terminal is connected with diode D17 negative terminal, diode D17 is just being connected to No. 1 end (J2-1) of outside negative signal end input interface J2, the coil-end of the relay R LY1 being connected with diode D1 anode and other 15 relay R LY2, RLY3 ... the corresponding end of the coil of RLY16 interconnects successively, and is connected to together No. 17 ends (J2-17) of outside negative signal end input interface J2; The switch-side moving contact end of relay R LY1 and other 15 relay R LY2, RLY3 ... the switch-side corresponding end of RLY16 interconnects successively, and is connected to together No. 1 end (J1-1) of PLC end input interface J1; The switch-side normally opened contact of relay R LY1 is connected to No. 17 ends (J1-17) of PLC end input interface J1;
What RLY2 selected is with a normally closed relay in Lu Changkai He Yi road, the two ends of diode D2 are corresponding connected with the two ends of relay R LY2, the coil-end of the relay R LY2 being connected with diode D2 negative terminal is connected with diode D18 negative terminal, diode D18 is just being connected to No. 2 ends (J2-2) of outside negative signal end input interface J2, the coil-end of the relay R LY2 being connected with diode D2 anode and other 15 relay R LY1, RLY3 ... the corresponding end of the coil of RLY16 interconnects successively, and is connected to together No. 17 ends (J2-17) of outside negative signal end input interface J2; The switch-side moving contact end of relay R LY2 and other 15 relay R LY1, RLY3 ... the switch-side corresponding end of RLY16 interconnects successively, and is connected to together No. 1 end (J1-1) of PLC end input interface J1; The switch-side normally opened contact of relay R LY2 is connected to No. 16 ends (J1-16) of PLC end input interface J1;
RLY3 respectively with D3 and D19 wiring, RLY4 respectively with D4 and D20 wiring ... RLY16 respectively with D16 and D32 wiring, the rest may be inferred.
2. the digital signal acquiring board based on the isolation of PLC band according to claim 1, is characterized in that: described PLC end input interface J1 is used for being connected with PLC digital quantity input module (2),
The structure of PLC end input interface J1 is, have 17 interface end, the positive pole of one termination PLC DC power supply of No. 1 end wherein, be 24VDC, another termination 16 relay R LY1, RLY2 of No. 1 end ... the switch-side moving contact end of RLY16 interconnect (J1-1) successively, remaining is 17,16 years old ... No. 2 terminated line mode is consistent, below is illustrated as an example of 17, No. 16 terminated lines example:
The 1st tunnel input (DI1) of one termination PLC digital quantity input module (2) of No. 17 ends, the switch-side normally opened contact end (J1-17) of another relay termination RLY1 of No. 17 ends;
The 2nd tunnel input (DI2) of one termination PLC digital quantity input module (2) of No. 16 ends, the switch-side normally opened contact end (J1-16) of another relay termination RLY2 of No. 16 ends;
The rest may be inferred for other each ends.
3. the digital signal acquiring board based on the isolation of PLC band according to claim 1, is characterized in that: described outside negative signal end input interface J2 was connected with gauge tap signal and field level switching value signal for the while,
The structure of outside negative signal end input interface J2 is, have 17 interface end, the public negative pole (0VDC) of one termination PLC DC power supply of No. 17 ends wherein, RLY1, RLY2 that another termination of No. 17 ends is connected with diode D16 anode ... the coil-end (J2-17) of RLY16 relay, remaining is 1,2 years old ... No. 16 terminated line mode is consistent, below is illustrated as an example of 1, No. 2 terminated line example:
One termination first via gauge tap signal of No. 1 end or the negative signal end (signal1-) of field level switching value signal, another terminating diode D17 anode (J2-1) of No. 1 end;
One termination the second way control switch signal of No. 2 ends or the negative signal end (signal2-) of field level switching value signal, another terminating diode D18 anode (J2-2) of No. 2 ends;
The rest may be inferred for other each ends.
4. the digital signal acquiring board based on the isolation of PLC band according to claim 1, is characterized in that: described outside positive signal end input interface J3 was connected with gauge tap signal and field level switching value signal for the while,
The structure of outside positive signal end input interface J3 is, have 17 interface end, the 24V end (24VDC) of one termination 24V direct current industrial power of No. 17 ends wherein, the other end of No. 17 ends and other 1,2 ... No. 16 corresponding end interconnects successively, remaining is 1,2 years old ... No. 16 terminated line mode is consistent, below is illustrated as an example of 1, No. 2 terminated line example:
One termination first via gauge tap signal of No. 1 end or the positive signal end (signal1+) of field level switching value signal, 2,3 of the other end of No. 1 end and J3 interface ... No. 17 corresponding end interconnects successively;
One termination the second way control switch signal of No. 2 ends or the positive signal end (signal2+) of field level switching value signal, 1,3 of the other end of No. 2 ends and J3 interface ... No. 17 corresponding end interconnects successively;
The rest may be inferred for other each ends.
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| CN103809504A (en) * | 2014-03-18 | 2014-05-21 | 中国船舶重工集团公司第七0四研究所 | Signal acquisition device of ship monitoring and warning system |
| CN116300673A (en) * | 2023-01-11 | 2023-06-23 | 广东鸿业管桩有限公司 | Device for protecting internal circuit of PLC digital quantity input module based on intermediate relay |
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| CN2138313Y (en) * | 1992-09-28 | 1993-07-14 | 天津市机电工业学校 | Computer controlling strong current switch contact arrangement |
| US7566986B2 (en) * | 2005-09-12 | 2009-07-28 | Siemens Energy & Automation, Inc. | Selection line and serial control of remote operated devices in an integrated power distribution system |
| CN2872442Y (en) * | 2005-12-23 | 2007-02-21 | 李斌 | 16-path inputting conversion isolator of digital signals |
| US8030803B1 (en) * | 2006-10-03 | 2011-10-04 | Power Integrity Corp. | Dispenser data distribution system with controllable disconnectors |
| CN202257202U (en) * | 2011-07-11 | 2012-05-30 | 天津哈德韦尔自控技术有限公司 | 16-channel analog quantity data acquisition board |
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