PROFIBUS bus fault point rapid detection device

Abstract

The utility model provides a PROFIBUS bus fault point rapid detection device. The PROFIBUS bus fault point rapid detection device comprises an interface unit, a signal transmission unit and a detection unit which are connected in sequence. The interface unit is used for quickly accessing a PROFIBUS-DP network and acquiring a detection signal; the signal transmission unit is used for transmitting the detection signal to the detection unit; a light-emitting diode is arranged in the detection unit, when the light-emitting diode is switched on, the detection result is that the node is normal, and when the light-emitting diode is switched off, the detection result is that the node has a fault; the detection unit in the device can display the connection condition of the terminal resistor in the network in real time, the maintenance efficiency is effectively improved, repeated disassembly and assembly are not needed, and the problem of fault point expansion is avoided; meanwhile, consumption of manpower and material resources during maintenance of DP network fault points is reduced, and the production cost is reduced; in addition, the detection device is simple in structure, easy to transform on the basis of the existing equipment, and convenient for large-scale popularization and application.

Description

Technical Field

[0001] The utility model relates to the technical field of field bus fault detection, and more specifically to a PROFIBUS bus fault point rapid detection device. Background Art

[0002] PROFIBUS (Process Field Bus) is a standardized fieldbus-based industrial communication protocol primarily used for digital communication in electrical equipment and automation systems. Currently, PROFIBUS is widely used in various industrial automation fields, such as manufacturing, energy supply, and building automation.

[0003] Because PROFIBUS has always focused on system integration and systems engineering, especially on the research and development of application profiles, it is suitable for high-speed and highly immediate communication tasks. It is also the only fieldbus that can fully cover factory automation and process automation applications, and is particularly suitable for factory automation and process automation. Therefore, since its inception, PROFIBUS has been a leader in the field of fieldbus technology in the international market.

[0004] With the widespread application of PROFIBUS on production equipment, there may be some hidden dangers in the fieldbus communication of equipment during the production process. If they are not discovered and handled in time, it may cause communication failures in the system, thereby affecting the normal operation of the entire system, further leading to a decrease in equipment production efficiency and an increase in losses.

[0005] Production equipment typically communicates using the PROFIBUS-DP (Decentralized Periphery) protocol. Conventional maintenance methods involve dismantling each DP network node one by one and measuring the terminal resistance of each node to determine the location of the fault. However, in a normal production environment, a DP network is typically connected by multiple nodes, so this detection method consumes a significant amount of time, impacting production efficiency. Furthermore, repeated disassembly and assembly of DP network nodes can easily loosen connecting cables, leading to poor line disconnection and further expanding the scope of the fault.

[0006] The prior art discloses a Profibus-DP network system fault diagnosis method. In the absence of power, the DP heads of the circuit to be measured are removed and all turned to "OFF", and the 3rd and 8th bits of the DP head interface at the end are short-circuited to form a circuit; the resistance range of a digital multimeter is used to measure the resistance values of the 3rd and 8th bits of the DP head interface at the starting end. Since the internal resistance of each DP head node is the same, N ohms, there are M DP heads, so there are M*N ohms; then, the resistance values are measured in segments to determine which segment of the network has a problem, and finally which DP head has a problem, and the problematic DP head is replaced. This method still requires the use of external equipment such as a digital multimeter for detection, which has low portability and measurement efficiency. Utility Model Content

[0007] In order to overcome the defect of the above-mentioned prior art that it is difficult to quickly find the DP communication fault point of production equipment, the utility model provides a PROFIBUS bus fault point rapid detection device, which does not require multiple disassembly and assembly, effectively improves the maintenance efficiency of the fault point, and can avoid the problem of the fault point expanding due to multiple disassembly and assembly.

[0008] In order to solve the above technical problems, the technical solutions of the present utility model are as follows:

[0009] A PROFIBUS bus fault point rapid detection device comprises: an interface unit, a signal transmission unit and a detection unit connected in sequence;

[0010] The interface unit 1 is used to quickly access the PROFIBUS-DP network and obtain the detection signal;

[0011] The signal transmission unit is used to transmit the detection signal to the detection unit;

[0012] A light emitting diode is provided in the detection unit. When the light emitting diode is turned on, the detection result is that the node is normal. When the light emitting diode is turned off, the detection result is that there is a fault in the node.

[0013] Preferably, the interface unit comprises: a PROFIBUS bus connector, two ends of which are connected to the PROFIBUS-DP network and the signal transmission unit respectively.

[0014] Preferably, a first DB9 jack and a second DB9 jack are respectively provided at both ends of the PROFIBUS bus connector, the first DB9 jack is used to connect to the PROFIBUS-DP network; the second DB9 jack is connected to the signal transmission unit.

[0015] Preferably, two terminal resistors are provided in the PROFIBUS-DP network, each of the terminal resistors is connected to a signal output end of a DB9 pin connector, and the pins of the DB9 pin connector are used to connect to the first DB9 jack.

[0016] Preferably, the signal transmission unit is specifically a DB9 pin connector; the pins of the DB9 pin connector are connected to the second DB9 jack, and the signal output end of the DB9 pin connector is connected to the detection unit.

[0017] Preferably, the detection unit comprises: a power supply, a series resistor and a light emitting diode;

[0018] The positive electrode of the power supply is connected to one end of the series resistor, the other end of the series resistor is connected to the anode of the light emitting diode, and the cathode of the light emitting diode is connected to the signal transmission unit.

[0019] Preferably, the power source is a battery.

[0020] Preferably, the battery is a Super 12V alkaline battery.

[0021] Preferably, the series resistor is a 220Ω pure resistor in a red, brown, and gold ring.

[0022] Preferably, the conduction voltage drop of the light emitting diode is 2-3V.

[0023] Compared with the prior art, the beneficial effects of the technical solution of the utility model are:

[0024] The utility model provides a PROFIBUS bus fault point rapid detection device, comprising: an interface unit, a signal transmission unit and a detection unit connected in sequence; the interface unit is used to quickly access the PROFIBUS-DP network and obtain a detection signal; the signal transmission unit is used to transmit the detection signal to the detection unit; a light-emitting diode is provided in the detection unit, when the light-emitting diode is turned on, the detection result is that the node is normal, when the light-emitting diode is turned off, the detection result is that the node has a fault;

[0025] In the technical solution provided by the present invention, the interface unit can be quickly connected to the PROFIBUS-DP network without the need for multiple disassembly and assembly, and the detection unit can display the connection status of the terminal resistor in the network in real time; therefore, the maintenance efficiency of the fault point is effectively improved, and the problem of the expansion of the fault point caused by multiple disassembly and assembly is effectively avoided; at the same time, the consumption of manpower and material resources caused by the maintenance of the DP network fault point is reduced, and the production cost is effectively reduced; in addition, the detection device of the present invention has a simple structure and is easy to modify on the basis of existing equipment, which is convenient for large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a framework diagram of a PROFIBUS bus fault point rapid detection device provided in Example 1.

[0027] Figure 2 This is a framework diagram of a PROFIBUS bus fault point rapid detection device provided in Example 2.

[0028] Figure 3 This is a structural diagram of a PROFIBUS bus fault point rapid detection device provided in Example 2.

[0029] Figure 4 This is a wiring schematic diagram of the PROFIBUS bus connector provided in Example 2.

[0030] Figure 5 This is a working circuit diagram of the detection unit provided in Example 3. DETAILED DESCRIPTION

[0031] The accompanying drawings are for illustrative purposes only and are not to be construed as limiting this patent;

[0032] In order to better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size;

[0033] It is understandable to those skilled in the art that some well-known structures and descriptions thereof may be omitted in the drawings.

[0034] The technical solution of the present utility model is further described below with reference to the accompanying drawings and embodiments.

[0035] Example 1

[0036] like Figure 1 As shown, this embodiment provides a PROFIBUS bus fault point rapid detection device, comprising: an interface unit 1, a signal transmission unit 2 and a detection unit 3 connected in sequence;

[0037] The interface unit 1 is used to quickly access the PROFIBUS-DP network and obtain the detection signal;

[0038] The signal transmission unit 2 is used to transmit the detection signal to the detection unit 3;

[0039] The detection unit 3 is provided with a light emitting diode. When the light emitting diode is turned on, the detection result is that the node is normal. When the light emitting diode is turned off, the detection result is that there is a fault in the node.

[0040] In the specific implementation process, the interface unit 1 is first quickly connected to the PROFIBUS-DP network and a detection signal is obtained. The detection signal is then transmitted to the detection unit 3 using the signal transmission unit 2. The detection unit 3 uses the on / off status of the light-emitting diode to display the detection result. When the light-emitting diode is on, the detection result indicates that the node is normal. When the light-emitting diode is off, the detection result indicates that the node is faulty.

[0041] This device does not need to be disassembled and assembled multiple times, and the detection unit can display the connection status of the terminal resistor in the network in real time; therefore, the maintenance efficiency of the fault point is effectively improved, and the problem of the expansion of the fault point caused by multiple disassembly and assembly is effectively avoided; at the same time, this device has a simple structure and is easy to modify on the basis of existing equipment, which is convenient for large-scale promotion and application.

[0042] Example 2

[0043] like Figure 2 As shown, this embodiment provides a PROFIBUS bus fault point rapid detection device, comprising: an interface unit 1, a signal transmission unit 2 and a detection unit 3 connected in sequence;

[0044] The interface unit 1 is used to quickly access the PROFIBUS-DP network and obtain the detection signal;

[0045] The signal transmission unit 2 is used to transmit the detection signal to the detection unit 3;

[0046] The detection unit 3 is provided with a light emitting diode 31. When the light emitting diode 31 is turned on, the detection result is that the node is normal. When the light emitting diode 31 is turned off, the detection result is that the node is faulty.

[0047] The interface unit 1 includes: a PROFIBUS bus connector, both ends of which are connected to the PROFIBUS-DP network and the signal transmission unit 2 respectively;

[0048] The two ends of the PROFIBUS bus connector are respectively provided with a first DB9 jack 11 and a second DB9 jack 12, the first DB9 jack 11 is used to connect to the PROFIBUS-DP network; the second DB9 jack 12 is connected to the signal transmission unit 2;

[0049] The PROFIBUS-DP network is provided with two terminal resistors, each of which is connected to a signal output end of a DB9 pin connector, and the pin of the DB9 pin connector is used to connect to the first DB9 jack 11. In this embodiment, there can only be two terminal resistors in the network. Under normal conditions, these two terminal resistors are connected in series to the network. However, during measurement, they are measured separately at the node. Only one terminal resistor can be connected at a time, and the two terminal resistors are transformed into a parallel relationship.

[0050] The signal transmission unit 2 is specifically a DB9 pin connector; the pins of the DB9 pin connector are connected to the second DB9 jack 12, and the signal output end of the DB9 pin connector is connected to the detection unit 3;

[0051] The detection unit 3 includes: a power supply, a series resistor and a light emitting diode 31;

[0052] The positive electrode of the power supply is connected to one end of the series resistor, the other end of the series resistor is connected to the anode of the light emitting diode 31 , and the cathode of the light emitting diode 31 is connected to the signal transmission unit 2 .

[0053] In the specific implementation process, the interface unit 1 is connected to the field bus DP network through the DB9 connector, the signal transmission unit 2 transmits the detection signal, and the detection unit 3 detects the connection status of the DP network;

[0054] like Figure 3 As shown in the structural diagram, the PROFIBUS bus connector in this embodiment is specifically a PFB-G bus connector, with a DB9 jack (female) at each end, respectively used to connect to the DP network and the DP6 pin (male) in the signal transmission unit 2; the DB9 connector in the signal transmission unit 2 can conveniently separate and connect the interface unit 1 and the detection unit 3, thereby improving the flexibility of the device;

[0055] like Figure 4As shown in the figure, when the switch of the PROFIBUS bus connector is turned to "ON", A1 and B1 are connected to the terminal resistor, so only A1 and B1 can be connected to the terminal of the DP network, otherwise the terminal resistor cannot be connected; when the switch is turned to "OFF", the terminal resistor and the data line are disconnected, A1 and A2, B1 and B2 are connected, and the devices on the network are connected in series; because only pins 3 and 8 of the DB9 (pin) plug are used in normal use, so to judge whether the DP network hardware connection is normal, first ensure that the data line is firmly connected, and the best way to detect is to measure the resistance between pins 3 and 8. Resistance; If the connection is secure, then when the switch is turned to "ON", the resistance between 3 and 8 is 220 ohms, and when the switch is turned to "OFF", the resistance is infinite; by turning all the resistor switches to "OFF", and then starting from this terminal, turn the switches of each terminal resistor to "ON" in turn, observe the indicator light (light-emitting diode 31) on the detection unit 3, if the indicator light is on, that is, the measured resistance is 220 ohms, then the node is normal, then turn the switch to "OFF" and measure the next node; if the resistance of that node is abnormal and the indicator light is not on, then the wiring of that node is incorrect;

[0056] By respectively connecting the terminal resistors, this device effectively solves the problem of reduced equipment maintenance efficiency due to the inability to determine the DP network fault point during the maintenance process, effectively improving the production efficiency of the equipment; in addition, it reduces the consumption of manpower and material resources caused by repairing the DP network fault point, effectively reducing production costs; at the same time, the device has a simple structure and is easy to modify on the basis of existing equipment, with low modification cost, making it suitable for large-scale promotion.

[0057] Example 3

[0058] This embodiment provides a PROFIBUS bus fault point rapid detection device, comprising: an interface unit 1, a signal transmission unit 2 and a detection unit 3 connected in sequence;

[0059] The interface unit 1 is used to quickly access the PROFIBUS-DP network and obtain the detection signal;

[0060] The signal transmission unit 2 is used to transmit the detection signal to the detection unit 3;

[0061] The detection unit 3 is provided with a light emitting diode. When the light emitting diode is turned on, the detection result is that the node is normal. When the light emitting diode is turned off, the detection result is that the node is faulty.

[0062] The interface unit 1 includes: a PROFIBUS bus connector, both ends of which are connected to the PROFIBUS-DP network and the signal transmission unit 2 respectively;

[0063] The two ends of the PROFIBUS bus connector are respectively provided with a first DB9 jack and a second DB9 jack, the first DB9 jack is used to connect to the PROFIBUS-DP network; the second DB9 jack is connected to the signal transmission unit 2;

[0064] The PROFIBUS-DP network is provided with two terminal resistors, each of which is connected to the signal output end of a DB9 pin connector, and the pin of the DB9 pin connector is used to connect to the first DB9 jack. In this embodiment, there can only be two terminal resistors in the network. Under normal conditions, these two terminal resistors are connected in series to the network. However, during measurement, measurements are taken at each node. Only one terminal resistor can be connected at a time, and the two terminal resistors are transformed into a parallel relationship.

[0065] The signal transmission unit 2 is specifically a DB9 pin connector; the pins of the DB9 pin connector are connected to the second DB9 jack, and the signal output end of the DB9 pin connector is connected to the detection unit 3;

[0066] The detection unit 3 includes: a power supply, a series resistor and a light emitting diode;

[0067] The positive electrode of the power supply is connected to one end of the series resistor, the other end of the series resistor is connected to the anode of the light emitting diode, and the cathode of the light emitting diode is connected to the signal transmission unit 2;

[0068] In order to effectively ensure the accuracy of the device and effectively extend the service life of the device, such as Figure 5 As shown, in this embodiment, the power supply is specifically a Super 12V alkaline battery, the series resistor is specifically a 220Ω pure resistor with a red, brown and gold ring, and the conduction voltage drop of the light-emitting diode is 2~3V, which can provide real-time and accurate detection of the connection status of the circuit.

[0069] In the specific implementation process, the interface unit 1 is connected to the field bus DP network through the DB9 connector, the signal transmission unit 2 transmits the detection signal, and the detection unit 3 detects the connection status of the DP network;

[0070] The PROFIBUS bus connector in this embodiment is provided with a DB9 jack (female) at each end, which is used to connect to the DP network and the DP6 pin (male) in the signal transmission unit 2 respectively; the DB9 connector in the signal transmission unit 2 can conveniently separate and connect the interface unit 1 and the detection unit 3, thereby improving the flexibility of the device;

[0071] When the switch of the PROFIBUS bus connector is turned to "ON", A1 and B1 are connected to the terminal resistor, so only A1 and B1 can be connected to the terminal of the DP network, otherwise the terminal resistor cannot be connected; when the switch is turned to "OFF", the terminal resistor and the data line are disconnected, A1 and A2, B1 and B2 are connected, and the devices on the network are connected in series; because only pins 3 and 8 of the DB9 (pin) plug are used in normal use, to determine whether the DP network hardware connection is normal, you must first ensure that the data line is firmly connected, and the best way to detect it is to measure the resistance between pins 3 and 8; if it is connected If the wires are firm, then when the switch is turned to "ON", the resistance between 3 and 8 is 220 ohms, and when the switch is turned to "OFF", the resistance is infinite; by turning all the resistor switches to "OFF", and then starting from this terminal, turn the switches of each terminal resistor to "ON" in turn, and observe the LED indicator on the detection unit. If the indicator (LED) is on, that is, the measured resistance is 220 ohms, then the node is normal, then turn the switch to "OFF" and measure the next node; if the resistance of that node is abnormal and the indicator (LED) is not on, then the wiring of that node is incorrect;

[0072] This device uses a PROFIBUS bus connector to enable the interface unit to quickly connect to the DP network, which effectively solves the problem of multiple disassembly and assembly of the DP connector during maintenance. Secondly, this device can quickly and easily separate and combine the interface unit 1 and the detection unit 3 through the DB9 interface, reducing the failure rate of the device. While ensuring the flexibility of the device, it also improves the stability of the device. At the same time, by selecting a Super 12V alkaline battery, using a 220Ω pure resistor with a red, brown and gold ring, and using light-emitting diodes with a voltage drop of 2 to 3V in series, the problem of misjudgment of the fault point due to inaccurate detection instruments is reduced, thereby improving the accuracy of the device. In addition, by using the principle of terminal resistance for detection, this device can quickly and conveniently eliminate hardware connection failure points in the DP network, thereby improving maintenance efficiency.

[0073] The same or similar reference numerals correspond to the same or similar components;

[0074] The terms used in the drawings to describe positional relationships are for illustrative purposes only and should not be construed as limiting this patent;

[0075] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A PROFIBUS bus fault point rapid detection device, characterized in that: include: An interface unit (1), a signal transmission unit (2), and a detection unit (3) connected in sequence; The interface unit (1) is used for quickly accessing the PROFIBUS-DP network and obtaining a detection signal; The signal transmission unit (2) is used to transmit the detection signal to the detection unit (3); A light emitting diode is provided in the detection unit (3). When the light emitting diode is turned on, the detection result indicates that the node is normal. When the light emitting diode is turned off, the detection result indicates that the node is faulty.

2. A PROFIBUS bus fault point rapid detection device according to claim 1, characterized in that: The interface unit (1) comprises a PROFIBUS bus connector, with two ends of the PROFIBUS bus connector respectively connected to the PROFIBUS-DP network and the signal transmission unit (2).

3. A PROFIBUS bus fault point rapid detection device according to claim 2, characterized in that: The two ends of the PROFIBUS bus connector are respectively provided with a first DB9 jack and a second DB9 jack, wherein the first DB9 jack is used to connect to the PROFIBUS-DP network; and the second DB9 jack is connected to the signal transmission unit (2).

4. A PROFIBUS bus fault point rapid detection device according to claim 3, characterized in that: Two terminal resistors are provided in the PROFIBUS-DP network. Each of the terminal resistors is connected to a signal output end of a DB9 pin connector. The pins of the DB9 pin connector are used to connect to the first DB9 jack.

5. A PROFIBUS bus fault point rapid detection device according to claim 3, characterized in that: The signal transmission unit (2) is specifically a DB9 pin connector; the pins of the DB9 pin connector are connected to a second DB9 jack, and the signal output end of the DB9 pin connector is connected to the detection unit (3).

6. A PROFIBUS bus fault point rapid detection device according to claim 1, characterized in that: The detection unit (3) comprises: a power supply, a series resistor and a light emitting diode; The positive electrode of the power supply is connected to one end of the series resistor, the other end of the series resistor is connected to the anode of the light emitting diode, and the cathode of the light emitting diode is connected to the signal transmission unit (2).

7. A PROFIBUS bus fault point rapid detection device according to claim 6, characterized in that: The power source is specifically a battery.

8. A PROFIBUS bus fault point rapid detection device according to claim 7, characterized in that: The battery is specifically a Super 12V alkaline battery.

9. A PROFIBUS bus fault point rapid detection device according to claim 6, characterized in that: The series resistor is specifically a 220Ω pure resistor in a red, brown, and gold ring.

10. A PROFIBUS bus fault point rapid detection device according to claim 6, characterized in that: The conduction voltage drop of the light emitting diode is 2-3V.

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