CN109739175B - PLC relay quick distribution circuit - Google Patents
PLC relay quick distribution circuit Download PDFInfo
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- CN109739175B CN109739175B CN201910135250.9A CN201910135250A CN109739175B CN 109739175 B CN109739175 B CN 109739175B CN 201910135250 A CN201910135250 A CN 201910135250A CN 109739175 B CN109739175 B CN 109739175B
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Abstract
The invention provides a quick distribution circuit of a PLC relay, which is used for solving the technical problems of high connection cost, low efficiency, high error rate and poor compatibility of a fixed circuit board in the prior art when the PLC relay is manually connected, and comprises the following steps: the power supply system comprises a plurality of relays, a PLC interface, a first module, a second module, a power supply interface and an output interface; the first module is used for selecting the output type of the relay; the second module is used for distributing relay addresses when the voltage is output; by implementing the technical scheme of the invention, the main circuit and the plurality of relays are preset in the circuit, thus being beneficial to the mass production of the circuit and improving the production efficiency; the relay output mode is selected by using a short-circuit pin of the short-circuit cap, so that the time cost and the labor cost for relay distribution are reduced, and faults caused by human errors are reduced; the relay and the output interface are arranged, relay addresses can be freely distributed and switched, the output modes of the circuit are various, the circuit compatibility is improved, and the circuit scale production is facilitated.
Description
Technical Field
The invention relates to the field of industrial automation control, in particular to a PLC relay quick distribution circuit.
Background
A programmable logic controller (Programmable Logic Controller, PLC) is a controller with internal memory and input and output elements that is widely used in the industry. The digital output signal is generally high-low level or relay contact, in order to prolong the service life of the PLC, the output signal is not directly applied to general control objects such as an electromagnetic valve, a pump and the like, but the signal output by the PLC is converted into a switch state signal of the relay contact through an intermediate relay, so that the state of the control object is switched. The signal types can be largely classified into two types of switching signals and level signals. The switching signal is regarded as signal reception only by short-circuiting the high level and the level input to two pins; the level signal is either high (typically, the same voltage is used in the same control system, e.g., 24V dc) or low (approximately 0V). The PLC is provided with a plurality of digital quantity output interfaces, and different control systems are formed by arranging and combining a plurality of controlled objects.
The traditional control circuit is built by manually connecting wires, connecting the output interfaces of the PLC one to one with coils of the relays according to addresses, welding contacts of different relays with correct pins of corresponding output sockets on a rear panel of the controller according to an assembly drawing of the system, and has low efficiency and high error rate of assembly staff. However, if the whole set of control circuit is immobilized by a circuit board alone, it is difficult to adapt to the requirements of complex and changeable control systems.
Therefore, a PLC relay distribution circuit that is fast, simple to build, switchable in operating mode, and highly compatible is needed.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a PLC relay quick distribution circuit, and the technical scheme of the invention is implemented as follows:
a PLC relay fast distribution circuit comprising: the power supply system comprises a plurality of relays, a PLC interface, a first module, a second module, a power supply interface and an output interface; wherein the normally closed ends of the relays are idle; the PLC interface is connected to coils of the plurality of relays; the first module is used for selecting a relay output type and comprises two double-row pins, wherein: the first row of the first double-row pins is connected with a 24V power supply, and the second row of the first double-row pins is respectively connected with COM ends of the plurality of relays; the first row of odd pins of the second double-row needle are respectively connected with COM ends of the relays, and the even pins are respectively connected with normally open ends of the relays; a second row of second double row needles is connected to the output interface; the second module is used for distributing relay addresses when voltage is output and comprises n double rows of pins; n is the total signal number from the PLC interface; the n double rows of pins comprise m pairs of pins, and m is the total number of relays for voltage output; a first row of the n double rows of needles is connected to the output interface, and a second row is connected to the normally open ends of the plurality of relays; the power supply interface comprises an anode and a cathode, wherein the anode is connected to a first row of a first double-row needle of the first module and is used for supplying power to COM ends of the relays when the output type of the relays is voltage output; the negative electrode is connected with the negative electrodes of the relay coils and the output interface; the output interface comprises a voltage output interface and a switch output interface; the positive electrode of the voltage output interface is respectively connected with a second row of double rows of pins of the second module, and the negative electrode of the voltage output interface is connected with the negative electrode of the power supply interface; the switch output interface is connected to a second row of a second double row of pins of the first module.
Preferably, the PLC relay rapid distribution circuit further includes two shorting caps, the two shorting caps being respectively disposed between an X-th pair of pins of a first double-row pin of the first module and between an X-th pair of pins of a Y-th double-row pin of the second module.
Preferably, the rapid distribution circuit of the PLC relay further comprises two shorting caps, wherein the two shorting caps are respectively arranged between the Z-th pair of odd pins of the second double-row needle of the first module and between the Z-th pair of even pins of the second double-row needle of the first module.
Preferably, the PLC interface employs a flat cable socket.
Preferably, the output interface adopts a flat cable socket.
The application method of the PLC relay quick distribution circuit comprises the following steps of: voltage output and switch output two states; wherein, P1: voltage output, setting a short circuit cap between the X pair of pins of the first double-row needle of the first module and setting a short circuit cap between the X pair of pins of the Y double-row needle of the second module; thereby realizing that the X-th relay is set to be voltage output and is distributed to a Y-shaped pin in the voltage output interface; p2: the switch outputs, ensure that the X-th pair of pins of the first double-row pin of the first module is suspended, and a short circuit cap is arranged between the X-th pair of odd pins and the X-th pair of even pins of the second double-row pin of the first module; thereby realizing setting the X-th relay as a switch output and connecting to the X-th switch output interface.
By implementing the technical scheme of the invention, the technical problems of high connection cost, low efficiency, high error rate and poor compatibility of the fixed circuit board of the PLC relay manually performed in the prior art can be solved; by implementing the technical scheme of the invention, the main circuit and the plurality of relays are preset in the circuit, thus being beneficial to the mass production of the circuit and improving the production efficiency; the relay output mode is selected by using a short-circuit pin of the short-circuit cap, so that the time cost and the labor cost for relay distribution are reduced, and faults caused by human errors are reduced; the relay and the output interface are arranged, relay addresses can be freely distributed and switched, the output modes of the circuit are various, the circuit compatibility is improved, and the circuit scale production is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only one embodiment of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic circuit diagram of embodiment 1 and embodiment 2 of the present invention;
FIG. 2 is a voltage output electrical schematic diagram of embodiment 1 of the present invention;
fig. 3 is a schematic diagram of the electrical switching output of embodiment 2 of the present invention.
In the above drawings, each reference numeral indicates:
1-a PLC interface; 2-a power supply interface; 3-a first double row needle; 4-a first row of second double row needles; 5-a second row of second double row needles; 6-a second module double row needle; 7-a relay; 71-relay number one; 72-relay number two; 73-sixth relay; 8-a voltage output interface; 81-a voltage output interface; 9-a switch output interface; 91-switch number one output interface; 10-short-circuit cap.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
In one embodiment of the present invention, a PLC relay fast distribution circuit, as shown in fig. 1 and 2, includes: a plurality of relays 7, a PLC interface 1, a first module, a second module, a power supply interface 2, and an output interface; wherein the normally closed ends of the relays 7 are idle; the PLC interface 1 is connected to coils of a plurality of relays 7; the first module is used for selecting the output type of the relay 7, and comprises two double rows of needles, wherein: the first row of the first double-row needle 3 is connected with a 24V power supply, and the second row is respectively connected with COM ends of a plurality of relays 7; odd pins of the first row 4 of the second double-row pins are respectively connected with COM ends of the relays 7, and even pins are respectively connected with normal ends of the relays 7; a second row 5 of second double row needles is connected to the output interface; the second module is used for distributing the address of the relay 7 during voltage output and comprises n second module double-row pins 6; n is the total number of signals from the PLC interface 1; the n second module double-row pins 6 comprise m pairs of pins, and m is the total number of relays 7 for voltage output; a first row of n second module double row pins 6 is connected to the output interface, a second row is connected to the constant start of a plurality of relays 7; the power supply interface 2 comprises a positive electrode and a negative electrode, wherein the positive electrode is connected to a first row of the first double-row pins 3 of the first module and is used for supplying power to the COM ends of the plurality of relays 7 when the output type of the relays 7 is voltage output; the negative electrode is connected with the negative electrodes of the coils of the plurality of relays 7 and the output interface; the output interface comprises a voltage output interface 8 and a switch output interface 9; the positive electrode of the voltage output interface 8 is respectively connected with the second row of the double-row pins 6 of the second module, and the negative electrode is connected with the negative electrode of the power supply interface 2; the switch output interface 9 is connected to the second row 5 of the second double row of pins.
The user can select proper relay 7 quantity and circuit size according to parameters such as signal quantity required by circuit application scene, environment of installation circuit, etc., and set up the first double-row needle 3 stitch number of corresponding quantity according to relay 7 quantity, set up the double-row needle 6 quantity of second module in the second module according to the signal quantity that needs to output, the flexibility is high, increases circuit usable scene, improves circuit compatibility.
In this specific embodiment, twelve relays 7 are provided in total, the first double-row pins 3 are provided with twelve pairs of pins, the first row 4 of the second double-row pins and the second row 5 of the second double-row pins are provided with eight pins, the input module of the control signal is provided with nine pairs of pins for redundant arrangement, and the rest pins can be used for adding the relays 7 for later stage of the circuit, thereby increasing applicable scenes of the circuit and improving the compatibility of the circuit. The first relay 71 is only used for switching output, wherein the COM end of the first relay 71 is connected with a first pin of a second row of pins of the first double-row pin 3 and a first pin of a first row 4 of the second double-row pin, and the normally open end of the first relay 71 is connected with a second pin of the first row 4 of the second double-row pin; the three relays 7 are used for switching output and voltage output, wherein, taking the second relay 72 as an example, the COM end of the second relay 72 is connected with the second pin of the second row of pins 3 of the first module and the third pin of the first row 4 of the second row of pins, and the normally open end of the second relay 72 is connected with the third pin of the first row 4 of the second row of pins and the first pin of the second row of pins 6 of each second module; eight relays 7 are used for voltage output, in which, taking a sixth relay 73 as an example, the COM end of the sixth relay 73 is connected to the sixth pin of the second pin row of the first double-row pin 3 of the first module, and the normally open end of the sixth relay 73 is connected to the fifth pin of the second pin row 6 of each second module of the second module. The first relay 71 only performs switch output, has no voltage output function, avoids the situation that a 24V power supply is connected to a loop by mistake when a user uses the relay 71 to perform switch output, damages a circuit or external equipment, improves the safety of the circuit, and is convenient for the user to test.
The voltage output interface 8 and the switch output interface 9 can use the same interface, so that the circuit is convenient for large-scale production, the production cost is reduced, the power supply interface 2 can be set as a DC or AC interface, and the DC interface can be used for controlling a relay outside the circuit. In the specific embodiment, the power supply interface 2 adopts a 24V DC power supply interface, and the application range of the equipment is wide. The output interface is provided with four pairs of pins, the pins are arranged in a redundant mode, so that partial pins can be replaced conveniently when damaged, and preparation can be made for adding output signals in the future for users. In the switch output interface 9, taking the switch output interface 91 of the first number as an example, two pins on the switch output interface 91 of the first number are respectively connected with the first pin and the second pin of the second row 5 of the second double-row pins. In the voltage output interface 8, taking the first-size voltage output interface 81 as an example, a first pin of a first row of pins of the first-size voltage output interface 81 is connected with the negative electrode of the power supply interface 2, or can be directly grounded, the positive electrode of the 24V power supply interface 2 is connected with a first row of pins of a first double-row pin 3 of each first module, and each pin of a second row of pins of the first-size voltage output interface 81 is respectively connected with each pin of a first row of pins of four different second-module double-row pins 6.
In a preferred embodiment, as shown in fig. 1 and 2, a PLC relay rapid distribution circuit further includes two shorting caps 10, the two shorting caps 10 being disposed between the X-th pair of pins of the first double row pin 3 of the first module and the X-th pair of pins of the second double row pin 6 of the second module, respectively. Taking the second relay 72 as an example, the first pair of pins of the first double-row pin 3 of the first module is connected by using the shorting cap 10, and the power supply interface 2 is communicated with the COM end of the second relay 72 through the first pair of pins of the first double-row pin 3 of the first module. The first pair of pins of the double-row pin 6 of the second module of the No. 1 is connected by using the short circuit cap 10, and the normally open end of the second relay 72 is connected with the first voltage output interface 81 through the double-row pin 6 of the second module.
In a preferred embodiment, as shown in fig. 1 and 2, the PLC interface 1 employs a flat cable receptacle.
In a preferred embodiment, the output interface employs a flat cable socket.
The PLC interface 1 and the output interface use a flat cable socket, all pins are used for being connected with external equipment, a user can easily select the working mode of the circuit through software, the flat cable socket can protect all pins of the output interface, and the service life of the circuit is prolonged.
The use method of the PLC relay quick distribution circuit uses the PLC relay quick distribution circuit with the characteristics to output voltage, as shown in fig. 1 and 2, a short-circuit cap 10 is arranged between the X pair of pins of the first double-row pin 3 of the first module, and a short-circuit cap 10 is arranged between the X pair of pins of the second double-row pin 6 of the second module; thereby realizing setting the X-th relay 7 to voltage output and assigning it to the Y-pin in the voltage output interface 8.
Taking the example of the second relay 72, the shorting cap 10 is used to connect the first pair of pins of the first double row pin 3 of the first module and to connect the first pair of pins of any of the second module double row pins 6 of the second module. The PLC controls the coil of the second relay 72 to be electrified, so that the COM end in the second relay 72 is connected with a normally closed end, a power supply interface 2, a first double-row pin 3 of a first module, the second relay 72, a second double-row pin 6 of a second module and a voltage output interface 8 form a loop in sequence, 24V voltage output is realized, the PLC cuts off the power supply of the coil of the second relay 72, and the COM end in the second relay 72 is connected with a normally open end, so that 24V voltage output can be cut off.
In this embodiment, 11 relays 7 may be used for voltage output, the second module is provided with 13 second module double-row pins 6, the circuit may provide 13 24V voltage output signals for the voltage output interface 8 at most, and the user may select, according to actual needs, the relay 7 that each second module double-row pin 6 is turned on to control the output signal combination of the voltage output interface 8. The main circuit structure is preset, and a user can switch the circuit working mode only by increasing or reducing the number of the short-circuit caps 10 and replacing the positions of the short-circuit caps 10, so that the circuit is efficient and convenient.
Example 2
In a preferred embodiment, a PLC relay fast distribution circuit, as shown in fig. 1 and 3, is different from example 1 in that two shorting caps 10 are respectively disposed between the Z-th pair of odd pins of the second module double row pins 6 of the first module and between the Z-th pair of even pins of the second module double row pins 6 of the first module. Taking the first relay 71 as an example, the shorting cap 10 is used to connect the first pair of pins of the second module double-row pin 6 of the first module, one pin of the first switch output interface 91 is connected to the normal start end of the first relay 71 through the second module double-row pin 6 of the first module, the shorting cap 10 is used to connect the second pair of pins of the second module double-row pin 6 of the second module, and the other pin of the first switch output interface 91 is connected to the COM end of the first relay 71 through the second module double-row pin 6 of the first module.
The user only needs to increase or decrease the number of the short-circuit caps 10 and replace the positions of the short-circuit caps 10, so that a plurality of working modes of the relays 7 can be set, different voltage output and switch output combinations are selected, a quick switching relay distribution mode is realized, circuit compatibility is improved, and the user is easy to correct wiring errors.
As shown in fig. 1 and 3, unlike the embodiment 1, the use of the PLC relay rapid distribution circuit with the above characteristics for switching output ensures that the X-th pair of pins of the first double-row pin 3 of the first module is suspended, and a shorting cap 10 is disposed between the X-th pair of odd pins and the X-th pair of even pins of the second double-row pin 6 of the second module of the first module; thereby realizing setting the X-th relay 7 as a switching output and connecting to the X-th switching output interface 9. Taking the second relay 72 as an example, the third pair of pins and the fourth pair of pins of the second double-row pins 6 of the second module of the first module are connected by using the short-circuit cap 10, and the second double-row pins 6 of the second pair of the second module of the first module are suspended, so that the situation that the COM end of the second relay 72 is connected with 24V voltage and the voltage is wrongly output to the switch output interface 9 is avoided. The PLC controls the coil of the second relay 72 to be electrified, so that the COM end in the second relay 72 is normally closed, a switch output interface 9, a third pair of pins in the double-row pins 6 of the second module of the first module, the second relay 72, a fourth pair of pins in the double-row pins 6 of the second module of the first module and the switch output interface 9 sequentially form a loop, a circuit is connected, the PLC cuts off the power supply of the coil of the second relay 72, the COM end in the second relay 72 is connected with a normally open end, and the circuit is disconnected, so that switch output is realized.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A PLC relay fast distribution circuit, comprising: the power supply system comprises a plurality of relays, a PLC interface, a first module, a second module, a power supply interface and an output interface; wherein,
normally closed ends of the relays are idle;
the PLC interface is connected to coils of the plurality of relays;
the first module is used for selecting a relay output type and comprises two double-row pins, wherein: the first row of the first double-row pins is connected with a 24V power supply, and the second row of the first double-row pins is respectively connected with COM ends of the plurality of relays; the first row of odd pins of the second double-row needle are respectively connected with COM ends of the relays, and the even pins are respectively connected with normally open ends of the relays; a second row of second double row needles is connected to the output interface;
the second module is used for distributing relay addresses when voltage is output and comprises n double rows of pins;
n is the total signal number from the PLC interface; the n double rows of pins comprise m pairs of pins, and m is the total number of relays for voltage output; a first row of the n double rows of needles is connected to the output interface, and a second row is connected to the normally open ends of the plurality of relays;
the power supply interface comprises an anode and a cathode, wherein the anode is connected to a first row of a first double-row needle of the first module and is used for supplying power to COM ends of the relays when the output type of the relays is voltage output; the negative electrode is connected with the negative electrodes of the relay coils and the output interface;
the output interface comprises a voltage output interface and a switch output interface; the positive electrode of the voltage output interface is respectively connected with a second row of double rows of pins of the second module, and the negative electrode of the voltage output interface is connected with the negative electrode of the power supply interface; the switch output interface is connected with a second row of the second double-row needles of the first module;
the first short circuit cap and the second short circuit cap are respectively arranged between the X pair of pins of the first double-row needle of the first module and between the X pair of pins of the Y double-row needle of the second module;
the second module is provided with a second double-row pin, a third short-circuit cap and a fourth short-circuit cap, wherein the third short-circuit cap and the fourth short-circuit cap are respectively arranged between the Z-th pair of odd pins of the second double-row pin of the first module and between the Z-th pair of even pins of the second double-row pin of the first module.
2. The PLC relay fast distribution circuit according to claim 1, wherein the PLC interface employs a flat cable receptacle.
3. The PLC relay fast distribution circuit according to claim 2, wherein the output interface employs a flat cable receptacle.
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