Network detector and system

Abstract

The utility model discloses a network detector and a system, relates to the detection field, the network detector is provided with a voltage detection device, a two-core cable and a serial port plug, when communication detection needs to be carried out on a bus station on a bus, the serial port plug is connected with a socket of a connector of the bus station, and the serial port plug is connected with the socket of the connector of the bus station. According to the scheme, when the number of the bus stations connected to the bus is large, once a problem exists at the internal wiring position of the bus connector of one bus station, the voltage at the connection point of the bus station of the next stage and the bus can be reduced, and the bus station of the next stage is connected with the serial port plug through the two-core cable. According to the scheme, through the voltage detection device arranged in the device, the voltage at the joint of each bus station and the bus is detected in time, then whether communication between each bus station and the bus is stable or not is found in time, and the whole device is simple in structure, very portable, low in cost and convenient to use actually.

Description

Technical Field

[0001] The utility model relates to the field of detection, in particular to a network detector and a system. Background Art

[0002] With the advancement of technology, bus technology is becoming increasingly widely used. PROFIBUS bus transmission is currently widely utilized due to its flexible topology and its support for linear, tree, and ring structures, as well as redundant communication models. PROFIBUS-DP and PROFIBUS-FMS utilize the same transmission technology and unified bus access protocol, allowing them to operate simultaneously on the same cable. Both PROFIBUS-DP and PROFIBUS-FMS comply with the EIA RS-485 standard (also known as H2), allowing them to utilize inexpensive shielded twisted-pair cables. Unshielded twisted-pair cables can also be used when electromagnetic compatibility (EMC) requirements are met. When using PROFIBUS-DP or PROFIBUS-FMS for bus transmission, a fixed idle voltage is maintained between the A and B lines of the bus connector at any bus station on the bus. When too many stations are connected to the PROFIBUS bus, communication between the stations can become unstable. Therefore, a device is urgently needed to promptly detect the stability of communication between each station and the PROFIBUS bus. Utility Model Content

[0003] The purpose of the present utility model is to provide a network detector and system. Considering that when there are a large number of bus stations connected to a bus, once there is a problem in the internal wiring of the bus connector of a bus station, the voltage at the next-level bus station and the bus connection point will be reduced, so this solution uses a voltage detection device provided in the device to timely detect the voltage at the bus connection point of each bus station and the bus, and then timely discover whether the communication between each bus station and the bus is stable. The entire device has a simple structure, is very portable, and has a low cost, which is convenient for practical use.

[0004] In order to solve the above technical problems, the utility model provides a network detector, comprising: a voltage detection device, a two-core cable, and a serial port plug;

[0005] The voltage detection device is connected to the two-core cable and is used to measure the voltage value between the A line and the B line of the bus;

[0006] The serial port plug is connected to the sockets of the two-core cable and the connector of the bus station respectively;

[0007] The plugs of the connector of the bus station are respectively connected to the A line and the B line of the bus.

[0008] Optionally, also include:

[0009] a level signal collector, connected to the socket of the connector of the bus station, and configured to collect a first level of the A line and a second level of the B line;

[0010] A first display device is connected to the level signal collector and is used to display the level collected by the level signal collector.

[0011] Optionally, it also includes: a controller and a switch module;

[0012] The first end of the switch module is connected to the two-core cable, and the second end is connected to the voltage detection device;

[0013] The controller is connected to the host computer and the control end of the switch module respectively, and is used to control the switch module to be turned on or off accordingly based on the control signal transmitted by the host computer.

[0014] Optionally, the switch module is a relay, the moving contact of the normally open contact of the relay is the first end of the switch module, the static contact of the normally open contact of the relay is the second end of the switch module, the first end of the coil of the relay is the control end of the switch module, and the second end of the coil of the relay is grounded.

[0015] Optionally, the voltage detection device is a voltmeter.

[0016] Optionally, the two-core cable is a two-core copper wire.

[0017] Optionally, also include:

[0018] a processor, the processor being connected to the voltage detection device and the alarm device respectively, and being configured to control the alarm device to issue a corresponding alarm when the voltage value is less than a preset voltage threshold;

[0019] The alarm device.

[0020] Optionally, also include:

[0021] A message signal collector is connected to the socket of the connector of the bus station and is used to collect message signals.

[0022] Optionally, also include:

[0023] A second display device is connected to the message signal collector and is used to issue a corresponding display when the message signal collector collects the message signal.

[0024] In order to solve the above technical problems, the present invention also provides a network detection system, comprising: a bus, a bus station, and the network detector as described above, wherein the bus station is connected to the bus and the network detector respectively.

[0025] The purpose of the present utility model is to provide a network detector and system, in which a voltage detection device, a two-core cable and a serial port plug are provided in the network detector, wherein when it is necessary to perform communication detection on a bus station on a bus, the serial port plug is connected to the socket of the connector of the bus station, and the voltage detection device is connected to the serial port plug through the two-core cable. This solution takes into account that when there are a large number of bus stations connected to the bus, once there is a problem at the internal wiring of the bus connector of a bus station, the voltage at the next-level bus station and the bus connection point will be reduced. Therefore, this solution uses the voltage detection device provided in the device to timely detect the voltage at the bus connection point of each bus station and the bus connection point, and then timely discover whether the communication between each bus station and the bus is stable. The entire device has a simple structure, is very portable, and has a low cost, which is convenient for practical use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of the structure of a network detector provided by the utility model;

[0028] Figure 2 The utility model provides a structural diagram of a PROFIBUS bus segment. DETAILED DESCRIPTION

[0029] The core of the present invention is to provide a network detector and system. Considering that when there are a large number of bus stations connected to the bus, once the internal wiring of the bus connector of a bus station is not lit, the voltage at the next-level bus station and the bus connection point will be reduced, so this solution uses the voltage detection device set in the device to timely detect the voltage at the bus connection point of each bus station and the bus, and then timely discover whether the communication between each bus station and the bus is stable. The entire device has a simple structure, is very portable, and has a low cost, which is convenient for practical use.

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a network detector provided by the utility model. The network detector includes: a voltage detection device 1, a two-core cable 2, and a serial port plug 3;

[0032] The voltage detection device 1 is connected to the two-core cable 2 and is used to measure the voltage value between the A line and the B line of the bus;

[0033] The serial port plug 3 is connected to the sockets of the two-core cable 2 and the connector of the bus station respectively;

[0034] The plugs of the connector of the bus station are connected to the A line and B line of the bus respectively.

[0035] In the present invention, considering that when there are a large number of bus stations connected to the bus, once the internal wiring of the bus connector of a bus station is not lit, the voltage at the next-level bus station and the bus connection point will be reduced, so the network detector provided by this solution is provided with a voltage detection device 1, a two-core cable 2 and a serial port plug 3. When it is necessary to perform communication detection on the bus station on the bus, the serial port plug 3 is connected to the socket of the connector of the bus station, and the voltage detection device 1 is connected to the serial port plug 3 through the two-core cable 2, and then detects the voltage at the current bus station and the bus connection point, so as to judge whether the communication between each bus station and the bus is stable through the detected voltage. The whole device has a simple structure, is very portable, and has low cost, which is convenient for practical use.

[0036] It should be noted that the structure of the PROFIBUS bus segment in the prior art is as follows: Figure 2 As shown in the figure, bus terminators should be connected to both ends of the A and B lines of the bus. The bus terminator's pull-down resistor is connected to the data reference potential DGND, and the pull-up resistor is connected to the positive power supply voltage VP (typically supplied by the PLC module). These two resistors ensure a defined idle potential on the bus when no stations are transmitting data. Almost all standard PROFIBUS bus connectors have integrated bus terminators, which can be selected using a switch.

[0037] The innovation of this application lies in the consideration that a fixed idle voltage of 1.1V exists between the A and B lines of the bus connected within the bus connector of any station in a PROFIBUS-DP / FMS network. This 1.1V voltage is divided by the bus terminators within the bus connectors at both ends of the network. When there are many stations, the idle voltage at some stations in the network may drop due to wiring resistance. The normal range is between 0.3-1.1V. If the voltage falls below 0.3V (the preset voltage threshold), network communication will become unstable and malfunction. If the voltage between the A and B lines in the bus connector of a suspected faulty station in the network is measured and compared with the idle voltage in the range of 0.3-1.1V, the faulty station can be identified. Therefore, by using an RS485 plug (serial port plug 3), leading out the 38 pin and combining it with a standard 0-5V DC voltmeter, a simple PROFIBUS-DP / FMS network detector can be made. Simply insert the serial port plug 3 of the tool into the bus connector of any station in the PROFIBUS-DP / FMS network, and by reading the voltage value and comparing it with the standard value, you can easily determine whether the station is communicating normally in the PROFIBUS-DP / FMS network.

[0038] It should also be noted that the bus connector typically uses a 9-pin D-type connector to connect to the bus. The D-type connector's socket connects to the bus station, while the D-type connector's plug connects to the bus. The connector wiring is shown in Table 1.

[0039] Table 1

[0040]

[0041] The present embodiment provides a network detector, which is provided with a voltage detection device 1, a two-core cable 2 and a serial port plug 3. When it is necessary to perform communication detection on a bus station on the bus, the serial port plug 3 is connected to the socket of the connector of the bus station, and the voltage detection device 1 is connected to the serial port plug 3 through the two-core cable 2. This solution takes into account that when there are a large number of bus stations connected to the bus, once there is a problem in the internal wiring of the bus connector of a bus station, the voltage at the next-level bus station and the bus connection point will be reduced. Therefore, this solution uses the voltage detection device 1 provided in the device to timely detect the voltage at each bus station and the bus connection point, and then timely discover whether the communication between each bus station and the bus is stable. The entire device has a simple structure, is very portable, and has low cost, which is convenient for practical use.

[0042] Based on the above embodiment:

[0043] As an optional embodiment, the method further includes:

[0044] A level signal collector is connected to the socket of the connector of the bus station and is used to collect the first level of line A and the second level of line B;

[0045] The first display device is connected to the level signal collector and is used to display the level collected by the level signal collector.

[0046] In the present invention, the stability of communication between the bus station and the bus is taken into consideration, which is also related to whether the bus transmits data normally. When each bus station performs data transmission through the bus, the waveforms on the A line and the B line of the bus are opposite, that is, when data is transmitted on the bus, the levels of the A line and the B line of the bus must be different. Therefore, this solution additionally provides a level signal collector to simultaneously collect the first level at the A line and the second level at the B line, and provides a first display device to display the first level and the second level collected by the level signal collector through the first display device. When the first level is not equal to the second level, it can be determined that the communication on the current bus is unstable.

[0047] It should be noted that when a bus station is transmitting data, the waveforms on lines A and B of the bus are opposite. For example, when the signal is 1, line B is high and line A is low. The idle state between messages corresponds to a binary "1" signal.

[0048] As an optional embodiment, it further includes: a controller and a switch module;

[0049] The first end of the switch module is connected to the two-core cable 2, and the second end is connected to the voltage detection device 1;

[0050] The controller is connected to the control end of the host computer and the switch module respectively, and is used to control the switch module to turn on or off accordingly based on the control signal transmitted by the host computer.

[0051] In the present invention, when the network detector is only provided with a voltage detection device 1, a two-core cable 2 and a serial port plug 3, if one wants to determine whether the current bus communication is stable, one needs to insert the connectors of each bus station on the bus separately, which is time-consuming and labor-intensive, and the voltage value measured in this way is an instantaneous value. Once the connector becomes loose after the measurement, it will also cause unstable communication. Therefore, this solution takes the above-mentioned problems into consideration and decides to additionally provide a controller and a switch module. The upper computer can remotely and in real time obtain the voltage value at the connection between the current bus station and the bus through the controller, and remotely control the opening and closing of the switch module through the controller. This method not only greatly saves manpower, but also improves the accuracy of judgment.

[0052] As an optional embodiment, the switch module is a relay, the moving contact of the normally open contact of the relay is the first end of the switch module, the static contact of the normally open contact of the relay is the second end of the switch module, the first end of the coil of the relay is the control end of the switch module, and the second end of the coil of the relay is grounded.

[0053] In the present invention, the switch module adopts a relay, and the controller controls the energization of the relay coil by sending an electrical signal. When the relay coil is energized, the moving contact and the static contact of the normally open contact of the relay are closed. Conversely, if the relay coil is not energized, the moving contact and the static contact of the normally open contact of the relay remain disconnected. The relay has the advantages of fast action, stable operation, long service life, small size, can directly control larger loads, does not require additional driving devices, can isolate strong current and weak current, etc.

[0054] As an optional embodiment, the voltage detection device 1 is a voltmeter.

[0055] In the present invention, the voltage detection device 1 used is a voltmeter, and the main features of the voltmeter are accurate measurement, wide application range, stable performance, and flexible use.

[0056] It should be noted that in actual applications, the voltage detection device 1 can be a voltmeter or other voltage detection device 1 such as a multimeter. Among them, if a multimeter is used as the voltage detection device 1, it can have the advantages of high accuracy, strong resolution, fast testing speed, intuitive display, strong filtering ability, low power consumption, and easy portability.

[0057] As an optional embodiment, the two-core cable 2 is a two-core copper wire.

[0058] In the present invention, the two-core cable 2 uses two-core copper wires, mainly due to the characteristics of copper wires such as strong conductivity and low cost.

[0059] As an optional embodiment, the method further includes:

[0060] A processor, the processor is connected to the voltage detection device 1 and the alarm device respectively, and is used to control the alarm device to issue a corresponding alarm when the voltage value is less than a preset voltage threshold;

[0061] Alarm device.

[0062] In the present invention, considering that there are a large number of bus stations connected to the bus, once the internal wiring of the bus connector of one bus station is not lit, the voltage at the next-level bus station and the bus contact will be reduced. Therefore, when the voltage value at the bus station and the bus contact is less than the preset voltage threshold, it proves that the communication is unstable at this time. Therefore, the network detector provided by this solution is also provided with a processor and an alarm device. When the processor detects that the voltage value is less than the preset voltage threshold, the alarm device is controlled to issue a corresponding alarm, which makes it easier for users to discover the instability of bus communication and is convenient for practical use.

[0063] As an optional embodiment, the method further includes:

[0064] The message signal collector is connected to the socket of the connector of the bus station and is used to collect message signals.

[0065] In the present invention, the stability of communication between the bus stations and the bus is taken into consideration, which is also related to whether each bus station can transmit data. That is, under normal circumstances, if each bus station needs to communicate, it needs to send a message signal to the corresponding bus station through the bus. Therefore, this solution takes advantage of this and additionally sets up a message signal collector to collect the message signals sent by the corresponding connected bus stations. When the bus station sends a message signal but the other bus stations do not receive the message signal, it can be determined in time that the communication on the bus is unstable or even fails, which facilitates timely maintenance and improves the reliability and stability of the solution.

[0066] As an optional embodiment, the method further includes:

[0067] The second display device is connected to the message signal collector and is used to issue a corresponding display when the message signal collector collects the message signal.

[0068] In the present invention, a second display device is further provided, through which the customer can observe the collection status of the message signal in a timely manner, which is more conducive to timely discovery of faults.

[0069] The utility model also provides a corresponding embodiment of a network detection system, comprising: a bus, a bus station, and the network detector as described above, wherein the bus station is connected to the bus and the network detector respectively.

[0070] The network detection system provided in this embodiment corresponds to the above-mentioned network detector, and therefore has the same beneficial effects as the above-mentioned network detector. Therefore, for the embodiments of the network detection system part, please refer to the description of the embodiments of the network detector part, which will not be repeated here.

[0071] It should be noted that, in this specification, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0072] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A network detector, characterized in that: include: Voltage detection device, two-core cable, serial port plug; The voltage detection device is connected to the two-core cable and is used to measure the voltage value between the A line and the B line of the bus; The serial port plug is connected to the sockets of the two-core cable and the connector of the bus station respectively; The plugs of the connector of the bus station are respectively connected to the A line and the B line of the bus.

2. The network detector according to claim 1, wherein: Also includes: a level signal collector, connected to the socket of the connector of the bus station, and configured to collect a first level of the A line and a second level of the B line; A first display device is connected to the level signal collector and is used to display the level collected by the level signal collector.

3. The network detector according to claim 1, wherein: Also includes: Controller and switch module; The first end of the switch module is connected to the two-core cable, and the second end is connected to the voltage detection device; The controller is connected to the host computer and the control end of the switch module respectively, and is used to control the switch module to be turned on or off accordingly based on the control signal transmitted by the host computer.

4. The network detector according to claim 3, wherein: The switch module is a relay, the moving contact of the normally open contact of the relay is the first end of the switch module, the static contact of the normally open contact of the relay is the second end of the switch module, the first end of the coil of the relay is the control end of the switch module, and the second end of the coil of the relay is grounded.

5. The network detector according to claim 1, wherein: The voltage detection device is a voltmeter.

6. The network detector according to claim 1, wherein: The two-core cable is a two-core copper wire.

7. The network detector according to claim 1, wherein: Also includes: a processor, the processor being connected to the voltage detection device and the alarm device respectively, and being configured to control the alarm device to issue a corresponding alarm when the voltage value is less than a preset voltage threshold; The alarm device.

8. The network detector according to any one of claims 1 to 7, characterized in that: Also includes: A message signal collector is connected to the socket of the connector of the bus station and is used to collect message signals.

9. The network detector according to claim 8, wherein: Also includes: A second display device is connected to the message signal collector and is used to issue a corresponding display when the message signal collector collects the message signal.

10. A network detection system, characterized in that: include: A bus, a bus station, a network detector according to any one of claims 1 to 9, wherein the bus station is connected to the bus and the network detector respectively.

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