42 results about "Profibus" patented technology

The invention discloses an automatic remote control method and system for a port machine, and relates to the technical field of automation, and the method comprises the steps: front-end processing equipment is connected with a lifting appliance positioning sensor and a motor driver, generates an equipment topological graph, is connected with a plurality of port machine PLC networks through a Profibus-DP coupler, and outputs a network state report; meanwhile, a dual-redundancy operation platform interface is configured and a state identification signal is output; based on the state identification signal, constructing an all-optical link and generating an optical fiber path topology, performing layered transmission on a lifting appliance control instruction and a path instruction, establishing a heartbeat detection mechanism and triggering a state confirmation signal; receiving a state confirmation signal and the wavelength allocation table, and acquiring laser radar point cloud data through a dedicated channel to execute lifting appliance obstacle avoidance correction; and based on the operation control authority and the new optimal path sequence, constructing a digital twin, and generating a scheduling report through an LSTM model. According to the method, the special channel and the shared channel are constructed, so that instruction blocking is eliminated.

The invention discloses a lightweight MQTT heterogeneous protocol conversion gateway architecture system and method, and belongs to the technical field of protocol conversion, and the system comprises a core board which is used for operating a real-time operating system; the multi-protocol hardware interface module is integrated on the core board; the multi-protocol hardware interface module comprises an RS-232 / 485 serial port, an RJ45 Ethernet interface, a USB (Universal Serial Bus) interface and a WiFi (Wireless Fidelity) module; the protocol converter is arranged on the core board in a layered manner and is used for realizing dynamic conversion between PROFIBUS-DP and Modbus protocols on each layer of the OSI model; the communication architecture on the core board comprises a message publishing or subscribing agent mechanism; and the power management module is connected with the core board and is used for dynamic power consumption adjustment and a power-off protection mechanism. According to the method, intelligent mapping between a physical address, namely a PROFIBUS-DP station address and an IP address, is established, plug and play of field equipment is supported, and the deployment time is shortened from several hours traditionally to 10 minutes.

The invention relates to the technical field of automobile sheet metal part welding, and discloses an automobile C column inner plate assembly multi-station welding forming device which comprises a welding spot grouping and path optimizing module used for grouping input welding spot data information and calculating and outputting optimal welding path coordinate data; the PLC system is used for receiving the optimal welding path coordinate data, calculating the optimal welding path coordinate data, temporarily storing the optimal welding path coordinate data into the PLC system, and outputting a welding instruction through the Profibus-DP communication bus when the PLC system is called; and the welding module is used for responding to the welding instruction and executing a welding action. According to the welding spot grouping and path optimization module developed on the basis of a Matlab platform, the problem that residual stress distribution is uneven in the welding process is solved, the problem that a thermal field is unbalanced is also solved, the welding efficiency is improved, and the welding quality is improved. And the piezoelectric ceramic sensors arranged in the clamping areas of the feeding clamp trigger the PLC system to dynamically adjust the clamping pressure of the corresponding clamping areas of the feeding clamp so as to compensate thermal deformation displacement and restrain deformation.

The present invention relates to the technical field of automobile sheet metal welding, and discloses a multi-station welding forming device for an automobile C-pillar inner panel assembly, comprising a welding point grouping and path optimization module for grouping input welding point data information and calculating and outputting optimal welding path coordinate data; a PLC system and a Profibus-DP communication bus, wherein the PLC system is used to receive the optimal welding path coordinate data and temporarily store it internally after calculation, and when called, output a welding instruction via the Profibus-DP communication bus; and a welding module, wherein the welding module is used to respond to the welding instruction and execute a welding action. The welding point grouping and path optimization module developed by the present invention based on the Matlab platform not only solves the problem of uneven residual stress distribution during welding, but also solves the problem of thermal field imbalance, and improves welding efficiency. The piezoelectric ceramic sensors provided in each clamping area of the feed fixture trigger the PLC system to dynamically adjust the clamping pressure of the corresponding clamping area of the feed fixture to compensate for thermal deformation displacement and suppress deformation.

The invention discloses a slave station data processing method and system of a process field bus based on an FPGA, a storage medium, electronic equipment and a computer program product. The slave station data processing method comprises the following steps: receiving slave station data with a preset rate from a slave station of a process field bus based on an FPGA module; acquiring slave station data in the FPGA module through the first processing module; determining the priority of the slave station data in the first processing module based on a preset rule; receiving the slave station data in the first processing module through a second processing module according to the priority of the slave station data and a preset high-speed bus; and acquiring and analyzing the slave station data in the second processing module through a preset analysis module.

The invention discloses a hydropower station bus communication quality assessment method, equipment, a medium and a product, and relates to the technical field of industrial bus communication quality assessment, and the method constructs a four-dimensional assessment index system covering a physical layer, a link layer, an application layer and an environment layer for hydropower station multi-protocol and severe environment scenes. Extracting time-frequency domain features of a physical layer through wavelet packet transformation, and combining link layer statistics, application layer semantics and environmental interference features; optimizing a feature fusion weight by adopting improved PCA dimension reduction and a multi-head attention mechanism; and constructing an improved random forest model in which an environment interference weight coefficient is introduced, and carrying out classification evaluation on the feature matrix. According to the method, the problems that in the prior art, evaluation indexes are single, and protocol semantics and environmental interference are not considered are solved, the evaluation accuracy rate reaches 98.5% or above, various communication hidden dangers can be accurately recognized, and the method is suitable for various bus protocols such as Modbus and Profibus DP.

The application discloses a kind of port machine automation remote control method and system, it is related to automation technical field, including front end processing equipment connection spreader positioning sensor and motor driver, generates equipment topology diagram, interconnects multiple port machine PLC networks by Profibus-DP coupler and exports network status report, while configuring double redundancy operation platform interface and exports state identification signal;Based on state identification signal, construct all-optical link and generate optical fiber path topology, hierarchical transmission of spreader control instruction and path instruction is established, heartbeat detection mechanism is established and state confirmation signal is triggered;Receive state confirmation signal and wavelength allocation table, obtain laser radar point cloud data by special channel to execute spreader obstacle avoidance correction;Based on operation control authority and new optimal path sequence, construct digital twin, generate scheduling report by LSTM model.The application eliminates instruction blockage by constructing special channel and shared channel.

The invention relates to a device for detecting PROFIBUS-DP communication faults and a detection method thereof, which are applied to communication detection of a hot rolling and continuous annealing unit and are used for greatly reducing shutdown caused by the communication faults. The device comprises a programming DP communication head and a DP line needing to be detected, the programming DP communication head and the DP line needing to be detected are each provided with a terminal resistance switch and four terminals, the four terminals are A1B1 and A2B2, the DP line needing to be detected comprises a first connecting CB port, and the programming DP communication head comprises a connector used for being connected with other field buses, a second connecting CB port and an A / B short-circuit cable; and the connection CB port I in the DP line to be detected is connected with the connector in the programming DP communication head. The invention further provides a detection method convenient to operate. The device is reasonable in design, convenient to detect, safe, reliable and capable of accurately positioning a fault point, the equipment fault (F082) is greatly reduced, the product quality is improved, and the use requirement is met.

The invention discloses a steam generator liquid level control system verification platform based on hardware-in-the-loop simulation, and belongs to the technical field of nuclear reactor control. The invention aims to solve the problem of inaccurate description of physical equipment characteristics in the existing simulation technology. The platform comprises a DCS control system, a controlled device, an industrial control computer and a data communication network. The DCS control system comprises an upper computer, a Siemens S7-400 controller and a Siemens ET200M distributed I / O system, the controlled device is a Speedgoat real-time simulation platform carrying a steam generator simulation model, and the data communication network is composed of an industrial Ethernet and a PROFIBUS field bus. The platform supports a rapid control prototype and hardware-in-the-loop simulation dual mode, is compatible with PID and an intelligent control algorithm, has the functions of data storage, visual monitoring and the like, can accurately simulate actual working conditions, realizes full-process coverage from design to verification, improves simulation credibility and research and development efficiency, and provides a reliable test environment for steam generator liquid level control research.

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.

The invention relates to the technical field of industrial automation control, and discloses a slave station equipment configuration method and device and a related product. The method is deployed on an upper computer in a distributed control system, and the distributed control system further comprises a controller and a Profibus master station card. The method comprises the following steps: generating a slave station configuration file based on a general station description file and Profibus bus communication parameters of to-be-configured slave station equipment; establishing network connection among the upper computer, the controller and the Profibus master station card based on the IP address of the controller and the IP address of the Profibus master station card; the slave station configuration file is uploaded to a Profibus master station card; and sending a restart command to the Profibus master station card to enable the Profibus master station card to load the slave station configuration file and take effect. The slave station configuration scheme does not depend on DCS digits; a third-party frame or container does not need to be installed; and the generation and downloading of the configuration file are integrated on a unified platform, so that the configuration efficiency is greatly improved.

The application discloses a kind of based on bus communication's stacker-reclaimer remote fault diagnosis method and system, it is related to coal conveying system technical field, including: by installing sensor and data acquisition device on stacker-reclaimer, the operating parameter of equipment is collected in real time;Data is transmitted to auxiliary machine control room using Profibus bus communication mode, builds fault diagnosis platform on auxiliary machine control room server, realizes fault early warning and analysis, provides fault information.The remote fault diagnosis method based on bus communication provided in the application improves the reliability of equipment, reduces the failure rate, and ensures the stable operation of the coal conveying system. Remote monitoring and fault diagnosis are realized, labor cost is effectively reduced, and work efficiency is improved. The fault elimination time is shortened, the impact of equipment downtime on production is minimized to the greatest extent, and the overall operation efficiency of the system is improved.

A multifunctional communication monitoring module belongs to the technical field of communication monitoring and comprises a main control circuit module, a first CAN communication circuit module, a second CAN communication circuit module, an RS-485 communication circuit module, a Profibus communication circuit module, an Ethernet circuit module, a fault data storage circuit module and a power supply circuit module. The main control circuit module is connected with the first CAN communication circuit module, the second CAN communication circuit module, the RS-485 communication circuit module, the Profibus communication circuit module, the Ethernet circuit module, the fault data storage circuit module and the power supply circuit module. The communication monitoring module provided by the utility model can meet the requirements of each industrial field in the prior art on the communication monitoring module, can be compatible with three communication protocols, and has the advantages of strong compatibility, stable performance, strong interference seeing capability and low maintenance cost. The problems that an existing industrial-grade communication module is single in function, high in communication failure rate and high in maintenance cost can be solved.

The invention provides a field bus data receiving and decoding method, and relates to the technical field of data processing. The method comprises the following steps: receiving petrochemical field bus data in real time, and further determining a lead code, a start delimiter, an end delimiter and effective data in sequence; the Manchester decoding module is used for performing Manchester decoding on valid data, sending the decoded data to the UART interface of the single chip microcomputer, performing Manchester encoding on the data received by the UART, and outputting the data to the field bus MAU interface through the SPI interface of the single chip microcomputer. According to the invention, the current situation that the development of the communication interface of the field bus transmitter needs to depend on a special field bus communication controller chip is solved, and meanwhile, two field buses, namely a foundation field bus and a PROFIBUS PA, are compatible. A hardware interface is simplified based on the unvarnished transmission function of the UART, a complex memory bus interface is not needed, user type selection of a single-chip microcomputer is facilitated, the development difficulty of a field bus transmitter can be reduced, and the cost and product miniaturization are further reduced.

The invention discloses an unloader intelligent feeding control system and method based on multi-mode deep learning, and belongs to the technical field of port transportation equipment control. The control system comprises a multi-modal data fusion module, a data optimization module, a deep learning prediction module, a model training optimization module, a dynamic control module and a system integration module, data are collected through a radar, a strain gauge and an ultrasonic multi-modal sensor, after self-adaptive particle filter optimization, the data are input into a ResNet-LSTM spatiotemporal feature integration model to predict the feeding amount, and the feeding amount is calculated through the ResNet-LSTM spatiotemporal feature integration model. And an AdamW optimizer is combined with a cosine annealing strategy to train a model, finally, the frequency of the feeder is dynamically adjusted through a PPO algorithm, and accurate regulation and control are achieved through an industrial Ethernet platform and a Profibus-DP protocol. The control method is executed according to the steps of data acquisition, optimization, model construction, training, dynamic control and system integration. The technical problems that in traditional unloader feeding control, a sensor is prone to interference, prediction lags behind, labor is relied on, and energy consumption is high are solved.

The invention relates to the technical field of industrial automation testing, and discloses a PROFIBUS bus gateway module communication testing method and related equipment. The method is applied to a PROFIBUS bus gateway module communication test device, and comprises the following steps: a first control group responds to a test instruction and configures a gateway module group based on a preset communication parameter to obtain a test communication parameter; and the test software in the second control group configures attempt working parameters for the drive program in the PROFIBUS bus receiving group. And when the channel state is open, the driving program acquires a logic level sequence of the PROFIBUS bus group, and realizes self-matching of test communication parameters of the gateway module group based on the trial working parameters and the logic level sequence to obtain target communication parameters, so that the second control group controls the PROFIBUS bus equipment group to communicate with the gateway module group according to the target communication parameters. Therefore, automatic and repeatable communication testing is realized.

This utility model relates to the field of cable connector technology, specifically a PROFIBUS bus cable intermediate connector device. It includes a lower sealing box and an upper sealing box rotatably mounted on the surface of the lower sealing box. Both sides of the upper sealing box surface are threaded with housing screws, and both sides of the lower sealing box surface have screw holes for mates with the housing screws. A cable shielding connection groove is fixed within the lower sealing box cavity. This utility model utilizes a reliable cable connector connection method, solving the difficulty of PROFIBUS bus cable misconnection and addressing the problem of having to replace the entire PROFIBUS bus cable due to partial cable damage in complex environments. It significantly increases the difficulty of replacing PROFIBUS bus cables in certain areas, greatly reduces PROFIBUS bus cable waste, and ensures the reliability and stability of the automated communication system. This tool is easy to use, compact, flexible, and has a high protection level, making it suitable for any production environment and potentially widely adopted in the industry.

The invention is suitable for the technical field of long-distance automatic control, provides a communication network construction method for a compressor in a large-scale helium low-temperature system and a communication network, and aims to solve the problem that the transmission rate of PROFIBUS DP communication cannot meet the rate requirement of automatic control of the large-scale helium low-temperature system after the distance exceeds 400 meters. Combining optical fibers with a PROFIBUS DP network is expected to expand the effective transmission range. And through the matching arrangement of the terminal resistors, the situation that the resistance of the whole network terminal is increased due to the addition of the RS485 repeater is reduced, and communication hardware faults are avoided. The effective transmission distance of PROFIBUS DP communication is effectively improved, and the technical effects of automatic control of a large helium low-temperature system and stable operation of a communication network are achieved.

The invention relates to a cross-system cooperative communication system and method based on a multi-serial-port server, and relates to the technical field of distributed control system communication, the device comprises a multi-serial-port server main body, a serial port adaptation module, a protocol conversion module, a data scheduling module, a DCS interface adaptation module, a redundancy backup module and a fault diagnosis module; according to the method, cross-system cooperative communication is realized through serial port equipment access adaptation, multi-protocol unified conversion, DCS priority scheduling, dual-computer redundancy backup and fault self-healing. The system supports expansion of multiple types of serial ports such as RS232 / 485 / 422 and the like, is compatible with industrial protocols such as Modbus, Profibus, OPC UA and the like, can be seamlessly connected with peripherals such as a DCS main controller, a PLC, a sensor, an actuator and the like and DCS subsystems of different manufacturers, the data transmission delay is smaller than or equal to 10 ms, the fault switching time is smaller than or equal to 500 ms, the reliability, the real-time performance and the expansibility of cross-platform collaboration of the DCS system are remarkably improved, and the system is suitable for industrial control scenes such as chemical engineering, electric power, metallurgy and the like.

The invention belongs to the technical field of industrial automation and communication, and provides a hybrid network architecture and a data cooperative transmission method and device based on the hybrid network architecture, and the hybrid network architecture comprises a Profibus, an Ethernet, a Profibus optical fiber repeater and a multi-channel integrated service optical device. The Profibus is connected with the Ethernet through a Profibus optical fiber repeater and a multi-channel integrated service optical device, the Profibus covers a specified industrial control node, and the Ethernet is connected with a data processing center and a data acquisition node to form a topological structure of the hybrid network. The hybrid network architecture provided by the invention can adapt to different communication requirements according to actual conditions, realizes intelligent scheduling in use of bandwidth resources, avoids idle or waste of resources of a certain part of networks, ensures real-time performance and reliability of data transmission, avoids network congestion or resource waste, and has relatively high flexibility.

The invention relates to a valve cooling control system, a PLC communication device and communication method thereof and computer equipment. The device comprises a first communication module and a second communication module, a first Ethernet interface of the first communication module is used for being connected with a valve cooling control system through a PROFIBUS-DP protocol bus, and an IO interface of the first communication module is used for being connected with a PLC sub-module through a CLINK protocol bus; the CLINK protocol is a private protocol which meets the requirement of communication between a protocol master station and a protocol slave station in the valve cooling control system; a first Ethernet interface of the second communication module is used for being connected with a valve cooling control system through a PROFIBUS-DP protocol bus, and an IO interface of the second communication module is used for being connected with the PLC sub-module through a CLINK protocol bus; and the second Ethernet interface of the second communication module is in serial communication connection with the second Ethernet interface of the first communication module. According to the device, compatibility and data conversion of the PROFIBUS-DP protocol and the CLINK protocol can be realized.

Modular sensor and system platform for measurements, cleaning and calibration in analytical, gas temperature, pressure measurement, flow measurement and level measurement technology. - with integrated Ethernet technology Advanced Physical Layer (APL) and Single Pair Ethernet (SPE) as well as a modular electronics hardware and electronics software platform for measurement parameters, cleaning / calibration systems and service systems in liquid and / or gas analysis and / or temperature and / or pressure measurement technology and / or flow measurement technology and / or level measurement technology. - with integrated fieldbus Ethernet technology APL and / or SPE, PROFINET etherCAT, Ethernet TCP / IP, Ethernet UDP / IP and other similar and / or adapted fieldbus protocols, e.g. I / O-Link, USB, for potentially explosive (IECEX, ATEX, FM) and / or non-hazardous (non-EX) environments, - with direct connection option to programmable logic controllers (PLCs) and / or input / output units (I / Os or remote I / Os) of established system manufacturers, via fixed cable connection, implemented as a 2-wire and / or multi-wire connection, copper and / or fiber optic connection, and / or wireless connection, WLAN and / or Bluetooth as well as WirelessHART. - with direct connection option to PCs for explosion-hazardous and non-explosion-hazardous environments via USB and / or via interface or , USB modem for sensor-side Ethernet APL and / or SPE and / or PROFINET and other sensor-side fieldbuses, e.g. I / O-Link, PROFIBUS DP / PA or or FF, or HART-IP, or HART 4mA and specially adapted fieldbuses (where the modem can be used for explosion-hazardous and / or non-explosion-hazardous environments). - operable with standardized user interfaces, such as PACTware-FDT / DTM, and / or common field communicators, e.g. Emerson 475 Field Communicator for FF and HART or other systems from established manufacturers, or apps or application software for mobile operating systems, such as iPhone and / or PC, laptop with different operating systems (e.g. Apple, Windows and the like) and / or Visual Basic with Visual Basic XML Generator (which generates Simple Visual Basic Code to Read & Write XML Data and uses libraries for C++, Oracle Java, VB .Net, Silverlight, VB6).

The present invention relates to an intelligent control system based on a traveling mechanism, which is applied to the intelligent transformation of traditional traveling cranes. It includes the operation control scheme of the traveling crane, the PLC program logic for the operation control of the traveling crane, and the interlock control scheme between the traveling crane and the roller table. Among them, in order to facilitate communication with different types of hardware devices, the design of the operation control scheme of the traveling crane involves three interface schemes: ModBusTCP, ModBusRTU, and ProfiBus⪻. The program logic of the PLC includes: the main program of the management system, the subroutine for coordinate confirmation, the subroutine for heartbeat signal, the subroutine for real-time coordinate acquisition, the subroutine for pause management, the subroutine for emergency stop management, the subroutine for MES parsing, the subroutine for operation management, the subroutine for safety monitoring, the subroutine for alarm management, and the subroutine for recovery management. The interlock control between the traveling crane and the roller table includes: determining the conditions for loading on the roller table, the transformation of corresponding equipment, and hardware protection. Compared with the traditional traveling crane control module, this invention can make the control parameters of the traveling crane tend to be optimal and achieve the intelligent control of the traveling crane.

The invention discloses a control method for safe replacement of a straightening machine roller system. A hydraulic system PLC of a hot straightening machine exchanges hydraulic data with a main PLC of a rolling line through a profibus-DP communication network; and the main PLC receives and sends interaction data with the PLC of the rack body of the hot straightening machine through the DP-DP coupling communication coupler and controls the replacement of a straightening machine roller system. The invention further discloses a rolling line for safely replacing the straightening machine roll system. A series of serious potential safety hazards, roller system replacement delay and other consequences caused by upper beam misoperation in straightening roller system replacement due to restarting or abnormal downtime of the PLC of the main rolling line are avoided.

The invention discloses a protocol adaptive identification method and an IO data acquisition device.The protocol adaptive identification method is applied to the IO data acquisition device, the IO data acquisition device comprises an RS-485 interface, a Profibus protocol stack and a Modbus protocol stack are arranged in the IO data acquisition device, and the protocol adaptive identification method comprises the steps that when the RS-485 interface is kept in a receiving enabling state, the Profibus protocol stack and the Modbus protocol stack are connected with the RS-485 interface; the method comprises the following steps: monitoring a data frame on a communication bus in real time to obtain an original data stream, analyzing the original data stream to extract protocol features, performing protocol matching on the protocol features and a pre-stored Profibus feature library and Modbus feature library to confirm a protocol state, and activating a target protocol stack according to the protocol state to enter a protocol response state, the target protocol stack comprises a Profibus protocol stack and a Modbus protocol stack. According to the method, the risk of communication faults caused by manual configuration errors can be reduced, and the overall reliability and availability of the system are improved.

The invention provides an industrial Ethernet and wireless network data exchange method and device, and the method comprises the steps: enabling a control processor and a core control unit to carry out the analysis of a PROFIBUS DP message, and obtaining an analyzed PROFIBUS DP message; controlling an industrial protocol conversion unit to carry out protocol conversion on the analyzed PROFIBUS DP message between a PROFIBUS DP protocol and a PROFINET protocol to obtain PROFINET PDU (Protocol Data Unit) data; controlling the 5G communication unit to package the PROFINET PDU data layer by layer according to a 5G protocol stack to obtain a 5G data packet; and controlling the wireless transmission of the 5G data packet in the 5G network. The problems that in the prior art, conversion between the PROFIBUS protocol and the PROFINET protocol can be achieved only by introducing a protocol adapter or a protocol converter, the transmission path is lengthy, and the dependency relationship is complex are solved.

The utility model discloses a control system structure of prefabricated cabin type combined equipment, and belongs to the technical field of prefabricated cabin type combined equipment. The control system structure comprises an upper computer, a PLC main control cabinet and a plurality of prefabricated cabin type combined equipment, and the PLC main control cabinet comprises one of a combined type, a stacked type, a building block type and a rack type. The PLC main control cabinet is in communication connection with the upper computer through one of RS232 serial communication, RS485 serial communication, D-form serial communication, WLAN (Wireless Local Area Network) and double-wire PROFIBUS-DP communication, and the PLC main control cabinet is in communication connection with the plurality of prefabricated cabin type combined devices through cables; the control system structure is independent of the prefabricated cabin type combined structure, one control system structure can control and manage a plurality of prefabricated cabin type combined devices at the same time, control and management of the prefabricated cabin type combined devices are not affected, meanwhile, the occupied area of the prefabricated cabin type combined devices can be reduced, and practicability is high.

The invention belongs to the technical field of industrial field bus fault detection, and discloses a Profibus-DP bus fault detection model and a Profibus-DP bus fault detection method based on measurement voltage, and the specific technical scheme is as follows: in a Profibus-DP bus network, each station is accessed to the Profibus-DP bus network through a bus connector, a terminal resistor is integrated in the bus connector, and the terminal resistor is connected with the Profibus-DP bus network; whether the terminal resistor is connected or not is controlled through the dial switch, the on-off condition of the dial switch connected to each station is set, the fault type of the Profibus-DP bus is judged by detecting the direct-current voltage through the universal meter, an operator can conveniently and timely check faults, operation is easy, the idea is clear, and the Profibus-DP bus fault detection device is very suitable for common field maintenance personnel.

The invention discloses a Profibus-DP communication interface circuit and a Profibus-DP communication system, the Profibus-DP communication interface circuit comprises an isolation conversion circuit, a single-chip microcomputer signal processing circuit and a power supply circuit, the power supply circuit is used for supplying power to the whole Profibus-DP communication interface circuit, the isolation conversion circuit is connected with a DP connector, and the isolation conversion circuit is connected with the DP connector. A DP communication protocol processing circuit is arranged between the isolation conversion circuit and the single-chip microcomputer signal processing circuit, and the single-chip microcomputer signal processing circuit exchanges data with slave station speed regulation control equipment.

The present invention discloses an automatic detection circuit and method for cable faults in PROFIBUS communication. A first terminal device is provided with a terminal resistance matrix module. The first terminal resistance matrix module includes a first switching tube QU, a first resistor RU, a second resistor RT, a second switching tube QT, a third switching tube QD, and a third resistor RD (serving as a terminal resistance) connected in sequence. The first switching tube QU is connected to the input voltage UP of the first terminal device, and the third resistor RD is grounded to GND. The connection branch between the first resistor RU and the second resistor RT is connected to cable A. The connection branch between the second switching tube QT and the third switching tube QD is connected to cable B. It can realize the automatic detection of communication cable faults in the PROFIBUS communication field, significantly improving the stability and reliability of PROFIBUS communication. Moreover, the proposed terminal resistance matrix module of the present invention has a simple structure, and the automatic fault detection method is simple and efficient, which is very suitable for large-scale popularization and application.