Distributed IO module based on industrial bus

Abstract

The utility model belongs to the technical field of IO modules, and provides a distributed IO module based on an industrial bus. The IO module comprises a control side and a field side which are in communication connection with each other; the inverter, the transformer and the rectifier are electrically connected in sequence between the control side and the field side to realize power supply isolation between the control side and the field side, and the digital isolator is used for realizing communication isolation between the control side and the field side; the field side comprises a field power supply and a plurality of communication channels; each communication channel comprises an isolation power supply, an analog-to-digital converter and a signal collector; the isolation power supply is electrically connected with the analog-to-digital converter, the analog-to-digital converter is in communication connection with the signal collector, and the spare end of the signal collector is in communication connection with the corresponding sensor; the isolation power supply of each communication channel is electrically connected with the field power supply. According to the utility model, wiring abnormity can be avoided in the wiring process, and signal crosstalk can be avoided in the signal transmission process.

Description

Technical Field

[0001] The utility model relates to the technical field of IO modules, and particularly relates to a distributed IO module based on an industrial bus. Background Art

[0002] An IO module is an interface module connecting a control system or controlled devices. A distributed IO module is a commonly used type of IO module, which has the advantages of high reliability and convenient wiring. Introducing an industrial bus into the distributed IO module can achieve fast data transmission during the control process and improve control efficiency.

[0003] The distributed IO module based on an industrial bus includes a control side and a field side. The field side specifically includes: a field side power supply, an ADC module, and signal acquisition ports. The field side power supply is used to supply power to the ADC module. During the signal acquisition and transmission process, first, analog signals detected by each sensor are acquired based on the signal acquisition ports; then, after the analog signals are input into the ADC module, corresponding digital signals are obtained; finally, the digital signals are transmitted to the control side for analysis and control.

[0004] Specifically, for the field side power supply, an input common ground setting is adopted. However, the inventor found that this design form of the field side power supply will lead to the following technical defects: First, during the wiring process, the wire systems of the sensors corresponding to each signal channel are not the same, and the corresponding ground wires are directly connected to each other. Therefore, during the wiring process, it is easy to have a problem that the field ground wire is connected to the power supply, resulting in a power short circuit and triggering a safety accident. Second, during the signal transmission process, since the ground wires corresponding to each signal channel are connected, the ground potentials of different sensors may form leakage currents on the ground wire, resulting in signal crosstalk between communication channels. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a distributed IO module based on an industrial bus to improve the technical problems that wiring abnormalities are prone to occur during the wiring process and signal crosstalk is prone to occur during the signal transmission process caused by the current common ground setting method of the field side power supply.

[0006] To achieve the above object, the utility model proposes the following technical solutions:

[0007] This technical solution provides a distributed IO module based on an industrial bus, including: a control side and a field side that are communicatively connected to each other;

[0008] An inverter, a transformer, a rectifier, and a digital isolator are arranged between the control side and the field side; wherein, the inverter, the transformer, and the rectifier are electrically connected in sequence to achieve power supply isolation between the two, and the digital isolator is used to achieve communication isolation between the two;

[0009] The on-site side includes an on-site power supply and several communication channels; each of the communication channels includes: an isolated power supply, an analog-to-digital converter, and a signal collector; the isolated power supply is electrically connected to the analog-to-digital converter, the analog-to-digital converter is communicatively connected to the signal collector, and the spare end of the signal collector is communicatively connected to the corresponding sensor; the isolated power supplies of all communication channels are electrically connected to the on-site power supply.

[0010] Further, the sensor includes a two-wire sensor, and / or a three-wire sensor, and / or a four-wire sensor.

[0011] Further, the isolated power supply includes: a push-pull topology power supply, a half-bridge topology power supply, a full-bridge topology power supply, a forward topology power supply, and a flyback topology power supply.

[0012] Further, the voltage isolation range between communication channels is: not less than 500V.

[0013] Further, the model of the analog-to-digital converter is AD7689.

[0014] Further, the model of the digital isolator is: CA-IS3721HS.

[0015] Further, the control side includes: a control power supply, an MCU chip, and an industrial bus chip;

[0016] The control power supply is electrically connected to the MCU chip, and the MCU chip is communicatively connected to the industrial bus chip;

[0017] The control power supply is electrically connected to the on-site power supply, and the analog-to-digital converters corresponding to all communication channels are communicatively connected to the MCU chip.

[0018] Further, the model of the MCU chip is AT32F415RCT7.

[0019] Further, the industrial bus chip is a Lan9253 chip, and the corresponding communication protocol is the Ethercat protocol.

[0020] Further, the industrial bus chip is a TPS-1 chip, and the corresponding communication protocol is the Profinet protocol.

[0021] Beneficial effects:

[0022] As can be seen from the above, the present technical solution provides a distributed IO module based on an industrial bus to improve the technical defects of the existing distributed IO module, such as easy wiring errors and easy signal crosstalk in communication.

[0023] Specifically, the distributed IO module incorporates an industrial bus, which includes a control side and a field side that communicate with each other. The field side includes a field power supply and a number of communication channels. Each communication channel includes: an isolated power supply, an analog-to-digital converter, and a signal collector; the isolated power supply is electrically connected to the analog-to-digital converter, the analog-to-digital converter is communicatively connected to the signal collector, and the spare end of the signal collector is communicatively connected to the corresponding sensor; the isolated power supplies of all communication channels are electrically connected to the field power supply. At this time, since each communication channel has an independent isolated power supply, power interference between communication channels can be effectively avoided, ensuring the power stability of each channel. The isolated power supply design can also prevent the accuracy of the signal from being affected by power fluctuations, thereby improving the stability and reliability of the overall system. At the same time, the independent isolated power supply can effectively protect each channel in a high-voltage environment, avoiding equipment damage caused by voltage fluctuations and extending the service life of the equipment. Meanwhile, on the basis of the independent isolated power supply, each communication channel also uses an independent analog-to-digital converter, effectively preventing signal crosstalk between channels and ensuring the signal acquisition accuracy of each channel. It can also avoid the influence of high-voltage interference on the signal, improving the accuracy and stability of the signal. Further, the independent analog-to-digital converter can also work stably in a complex electromagnetic environment, reducing the influence of external electromagnetic interference on signal acquisition and ensuring the accuracy and reliability of the data. Meanwhile, an inverter, a transformer, a rectifier, and a digital isolator are provided between the control side and the field side; wherein, the inverter, the transformer, and the rectifier are electrically connected in sequence to achieve power isolation between the two, and the digital isolator is used to achieve communication isolation between the two. This backplane bus electrical isolation design further ensures the signal transmission stability and anti-interference ability between channels.

[0024] It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be regarded as part of the inventive subject matter of the present disclosure as long as such concepts do not contradict each other.

[0025] The foregoing and other aspects, embodiments, and features of the teachings of the present invention can be more fully understood from the following description taken in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will be apparent in the following description, or will be learned through practice of specific embodiments according to the teachings of the present invention. Description of the Drawings

[0026] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in each figure may be represented by the same reference numeral. For clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present invention will be described by way of example and with reference to the drawings, wherein:

[0027] Figure 1 It is a schematic structural diagram of the distributed IO module based on the industrial bus described in this embodiment. Specific implementation manners

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art belonging to the field of the present utility model.

[0029] The "first", "second" and similar terms used in the specification and claims of the patent application of the present utility model do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, unless clearly specified otherwise in the context, the singular forms such as "a", "an" or "the" do not denote a quantity limitation, but mean that there is at least one. The terms such as "comprising" or "including" are intended to indicate that the elements or items appearing before "comprising" or "including" cover the features, wholes, steps, operations, elements and / or components listed after "comprising" or "including", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0030] In the prior art, the distributed IO module based on the industrial bus includes a field-side power supply. Since the input common ground setting is adopted, the following defects are caused in specific use: on the one hand, during the wiring process, the wire systems of the sensors corresponding to each signal channel are not the same, and the corresponding ground wires are directly connected to each other. Therefore, during the wiring process, it is easy to have the problem that the field ground wire is connected to the power supply, resulting in a short circuit of the power supply and triggering a safety accident. On the other hand, during the signal transmission process, since the ground wires corresponding to each signal channel are connected, the ground potentials of different sensors may form leakage currents on the ground wire, resulting in signal crosstalk between communication channels. Based on this, this embodiment aims to provide a distributed IO module for the industrial bus to improve the above technical defects simultaneously.

[0031] The distributed IO module for the industrial bus disclosed by the present utility model will be further specifically introduced below with reference to the embodiments shown in the accompanying drawings.

[0032] As shown Figure 1 in the figure, the distributed IO module includes a control side and a field side that are communicatively connected to each other. Specifically, the field side includes a field power supply and a plurality of communication channels. Each communication channel includes: an isolated power supply, an analog-to-digital converter, and a signal collector; the isolated power supply is electrically connected to the analog-to-digital converter, the analog-to-digital converter is communicatively connected to the signal collector, and the spare end of the signal collector is communicatively connected to the corresponding sensor; the isolated power supplies of each communication channel are all electrically connected to the field power supply.

[0033] At this time, in the specific implementation, since each communication channel has an independent isolated power supply, it can effectively avoid power interference between communication channels and ensure the power stability of each channel. The isolated power supply design can also avoid affecting the accuracy of signals due to power fluctuations, thereby improving the stability and reliability of the overall system. At the same time, the independent isolated power supply can effectively protect each channel in a high-voltage environment and avoid equipment damage caused by voltage fluctuations, extending the service life of the equipment. At the same time, on the basis of the independent isolated power supply, each communication channel also uses an independent analog-to-digital converter to effectively prevent signal crosstalk between channels and ensure the signal acquisition accuracy of each channel. It can also avoid the influence of high-voltage interference on signals and improve the accuracy and stability of signals. Further, the independent analog-to-digital converter can also work stably in a complex electromagnetic environment, reducing the influence of external electromagnetic interference on signal acquisition and ensuring the accuracy and reliability of data.

[0034] In the specific implementation, the interface type of the signal collector is an RJ45 interface, and the corresponding specific parameter models can be 0-10V / 0-5V / ±10V / 0-20mA / 4-20mA, etc. The sensors corresponding to each communication channel can be two-wire sensors, and / or three-wire sensors, and / or four-wire sensors. At this time, even when multiple-wire sensors are used simultaneously, there will be no short-circuit abnormality caused by incorrect wiring.

[0035] Further, considering the power requirements and ripple requirements for each isolated power supply during actual implementation, the isolated power supply in this embodiment includes: push-pull topology power supplies, half-bridge topology power supplies, full-bridge topology power supplies, forward topology power supplies, and flyback topology power supplies, etc.

[0036] As a preferred embodiment, in this embodiment, the voltage isolation range between each communication channel is set to be not less than 500V. At this time, even if the power supply and signal are reversely connected when the on-site sensors use the same power supply, it will not cause a short circuit of the on-site power supply. This design greatly improves the fault tolerance of the device and ensures the reliability and safety under different working conditions. Based on this, in order to achieve the isolation level of not less than 500V, the model of the analog-to-digital converter is set to AD7689.

[0037] Meanwhile, an inverter, a transformer, a rectifier and a digital isolator are provided between the control side and the on-site side; wherein, the inverter, the transformer and the rectifier are electrically connected in sequence to achieve power supply isolation between the two, and the digital isolator is used to achieve communication isolation between the two. This backplane bus electrical isolation design further ensures the signal transmission stability and anti-interference ability between each channel. At the same time, this type of electrical isolation backplane bus isolation can also prevent the signals between different channels from interfering with each other, further improving the reliability of the system. And it can maintain the integrity of the signal during long-distance signal transmission, avoid signal attenuation and distortion, and ensure the accurate transmission of data.

[0038] Specifically, the DC power supply of the backplane first passes through an inverter to be converted into alternating current, and then enters the transformer for isolation. Subsequently, the power is converted back into direct current through the rectifier to provide isolated power for the on-site equipment. This process ensures the electrical isolation between the control side and the on-site side in terms of power supply. The specific digital isolator can be any isolator built based on principles such as magnetic field coupling or capacitance coupling. In this embodiment, it is specifically the CA-IS3721HS model.

[0039] In a further embodiment, in this embodiment, the control side specifically includes: a control power supply, an MCU chip and an industrial bus chip. Specifically, as Figure 1 shown, the control power supply is electrically connected to the MCU chip, and the MCU chip is communicatively connected to the industrial bus chip. The control power supply is electrically connected to the on-site power supply, and each analog-to-digital converter corresponding to each communication channel is communicatively connected to the MCU chip. Specifically, the model of the MCU chip is AT32F415RCT7.

[0040] During specific implementation, the communication protocol supported by the industrial bus chip can be the Ethercat protocol, and at this time the industrial bus chip is the Lan9253 chip. The communication protocol supported by the industrial bus chip can also be the Profinet protocol, and at this time the industrial bus chip is the TPS-1 chip.

[0041] In summary, the distributed IO module described in this embodiment has the following technical advantages:

[0042] (1) Improve system stability: By adopting an independent isolated power supply and ADC circuit design, the system can still operate stably in an environment with large power fluctuations, avoiding equipment failures caused by unstable power supplies. In industrial sites, power fluctuations and electromagnetic interference are common problems. Through a design with a high isolation level, these problems can be effectively solved to ensure the long-term stable operation of the equipment.

[0043] (2) Improve data acquisition accuracy: The independent analog-to-digital conversion and isolated power supply design ensure the signal acquisition accuracy of each communication channel, enabling accurate data acquisition even in a high-interference environment. In application scenarios that require high-precision data acquisition, such as medical equipment and scientific research, this design can provide highly reliable data support to ensure the accuracy and repeatability of the data.

[0044] (3) Enhance the adaptability of the device: The high isolation level design enables the device to adapt to various complex working environments, including extreme conditions such as high voltage and high electromagnetic interference, ensuring stable operation of the device in various environments. In different industrial application scenarios, this highly adaptable design can improve the versatility of the device, reduce equipment replacement and adjustment caused by environmental differences, and improve production efficiency.

[0045] (4) Reduce maintenance costs: Since the high isolation level design improves the stability and fault tolerance of the device, it can reduce the frequency of equipment failures and lower maintenance and replacement costs. During long-term operation, the improved reliability of the device means less downtime and maintenance costs, saving operating costs for enterprises and improving economic efficiency.

[0046] Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Those with ordinary knowledge in the technical field to which the present utility model pertains can make various modifications and refinements without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to that defined by the claims.

Claims

1. A distributed IO module based on industrial bus, characterized in that: include: The control side and the field side are connected to each other in communication; An inverter, a transformer, a rectifier and a digital isolator are arranged between the control side and the field side; wherein the inverter, the transformer and the rectifier are electrically connected in sequence to achieve power supply isolation between the two, and the digital isolator is used to achieve communication isolation between the two; The field side includes a field power supply and several communication channels; each of the communication channels includes: an isolated power supply, an analog-to-digital converter and a signal collector; the isolated power supply is electrically connected to the analog-to-digital converter, the analog-to-digital converter is communicatively connected to the signal collector, and the spare end of the signal collector is communicatively connected to the corresponding sensor; the isolated power supply of each communication channel is electrically connected to the field power supply.

2. The distributed IO module based on industrial bus according to claim 1, characterized in that: The sensor includes a two-wire sensor, and / or a three-wire sensor, and / or a four-wire sensor.

3. The distributed IO module based on industrial bus according to claim 2 is characterized in that: The isolated power supply includes: a push-pull topology power supply, a half-bridge topology power supply, a full-bridge topology power supply, a forward topology power supply, and a flyback topology power supply.

4. The distributed IO module based on industrial bus according to claim 1, characterized in that: The voltage isolation range between each communication channel is: not less than 500V.

5. The distributed IO module based on industrial bus according to claim 4, characterized in that: In order to meet the isolation level of more than 500V, the model of the analog-to-digital converter is AD7689.

6. The distributed IO module based on industrial bus according to claim 1, characterized in that: The model of the digital isolator is: CA-IS3721HS.

7. The distributed IO module based on industrial bus according to claim 1, characterized in that: The control side includes: a control power supply, an MCU chip and an industrial bus chip; The control power supply is electrically connected to the MCU chip, and the MCU chip is communicatively connected to the industrial bus chip; The control power supply is electrically connected to the field power supply, and each analog-to-digital converter corresponding to each communication channel is communicatively connected to the MCU chip.

8. The distributed IO module based on industrial bus according to claim 7, characterized in that: The model of the MCU chip is AT32F415RCT7.

9. The distributed IO module based on industrial bus according to claim 7, characterized in that: The industrial bus chip is a Lan9253 chip, and the corresponding communication protocol is the Ethercat protocol.

10. The distributed IO module based on industrial bus according to claim 7, characterized in that: The industrial bus chip is a TPS-1 chip, and the corresponding communication protocol is the Profinet protocol.

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