CN106657115B - Frequency converter control system and protocol conversion card thereof - Google Patents
Frequency converter control system and protocol conversion card thereof Download PDFInfo
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- CN106657115B CN106657115B CN201611265196.2A CN201611265196A CN106657115B CN 106657115 B CN106657115 B CN 106657115B CN 201611265196 A CN201611265196 A CN 201611265196A CN 106657115 B CN106657115 B CN 106657115B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
- G06F13/4286—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus using a handshaking protocol, e.g. RS232C link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/70—Virtual switches
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Abstract
The embodiment of the invention discloses a frequency converter control system and a protocol conversion card thereof, wherein the protocol conversion card comprises: the system comprises a first communication interface module, a second communication interface module, a processor, a dual-port RAM and an expansion controller; the processor is used for encapsulating and analyzing input data and carrying out virtual switch logic; the first communication interface module is connected with the processor, the expansion controller is connected with the processor, the second communication interface module is connected with the expansion controller, and the first communication interface module and the second communication interface module are used for communicating with corresponding communication equipment outside according to corresponding control signals of the processor; and the double-port RAM is connected with the processor and is used for carrying out data interaction with the corresponding frequency converter. The communication master station can conveniently control a plurality of communication slave stations, the communication speed is high, and the cost of the communication system can be reduced.
Description
Technical Field
The invention relates to the field of industrial communication, in particular to a frequency converter control system and a protocol conversion card thereof.
Background
With the development of power technology, frequency converters are applied more and more widely.
In the application of frequency converter, it is often encountered that one master station controls a plurality of slave stations. Namely, the frequency converters of a plurality of communication slave stations are controlled to operate by one communication master station. At present, a conversion card based on a BACnet/MSTP protocol (RS485 interface) is usually adopted to directly realize that one communication master station controls a plurality of communication slave stations, but the communication speed is slow, and the BACnet/IP protocol is a protocol based on an ethernet interface and is fast. However, the conversion device or structure based on the BACnet/IP protocol is complicated, or an application switch is required, which is costly.
Therefore, how to control a plurality of communication slave stations by a communication master station conveniently, and how to reduce the cost of a communication system with a high communication speed is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a frequency converter control system and a protocol conversion card thereof, which not only can facilitate a communication master station to control a plurality of communication slave stations, but also can reduce the cost of a communication system with higher communication speed.
In order to solve the technical problems, the invention provides the following technical scheme:
a protocol conversion card comprising: the system comprises a first communication interface module, a second communication interface module, a processor, a dual-port RAM and an expansion controller; the processor is used for encapsulating and analyzing input data and carrying out virtual switch logic; the first communication interface module is connected with the processor, the expansion controller is connected with the processor, the second communication interface module is connected with the expansion controller, and the first communication interface module and the second communication interface module are used for communicating with corresponding communication equipment outside according to corresponding control signals of the processor; and the double-port RAM is connected with the processor and is used for carrying out data interaction with the corresponding frequency converter.
Preferably, the dual-port RAM is a CPLD chip.
Preferably, the CPLD chip is connected to the corresponding frequency converter through a first hardware interface.
Preferably, the processor is further configured to perform repeated IP address detection, communication timeout fault detection, and communication status indication processing.
Preferably, the first communication interface module includes a first ethernet interface circuit and a first ethernet hardware interface connected to the first ethernet interface circuit.
Preferably, the second communication interface module includes a second ethernet interface circuit and a second ethernet hardware interface connected to the second ethernet interface circuit.
Preferably, the processor comprises: the BACnet communication protocol processing unit is used for encapsulating and analyzing the BACnet communication protocol data; and the switch logic unit is used for carrying out virtual switch logic processing.
A frequency converter control system comprising:
the protocol conversion cards are respectively arranged in slave station equipment of a corresponding communication slave station and connected with a corresponding frequency converter, and n is an integer larger than 0;
a master station device located at the communication master station;
the master station device and each of the slave station devices are connected in sequence.
Compared with the prior art, the technical scheme has the following advantages:
the protocol conversion card provided by the embodiment of the invention comprises: the system comprises a first communication interface module, a second communication interface module, a processor, a dual-port RAM and an expansion controller; the processor is used for encapsulating and analyzing input data and carrying out virtual switch logic; the first communication interface module is connected with the processor, the expansion controller is connected with the processor, the second communication interface module is connected with the expansion controller, and the first communication interface module and the second communication interface module are used for communicating with corresponding communication equipment outside according to corresponding control signals of the processor; and the double-port RAM is connected with the processor and is used for carrying out data interaction with the corresponding frequency converter. When the protocol conversion card is used, the protocol conversion card is only required to be arranged in each communication slave station and connected with a frequency converter in the communication slave station where the protocol conversion card is located. Because the protocol conversion card is provided with the two communication interface modules, one communication slave station can be in communication connection with two communication devices, the communication master station can be connected with one communication interface module of any communication slave station, the other communication interface module of the communication slave station can be connected with other communication slave stations, and then all the communication slave stations are connected in sequence, so that the control of the communication master station on the plurality of communication slave stations can be realized. The communication master station can be in communication connection with each communication slave station through a preset communication protocol, and the protocol conversion card of each communication slave station has a protocol conversion function and is used as a virtual switch to transmit information data. Therefore, the communication master station can conveniently control a plurality of communication slave stations, the communication speed is high, and the cost of the communication system can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a protocol conversion card according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a frequency converter control system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of CPLD data partitioning according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a frequency converter control system and a protocol conversion card thereof, which not only can facilitate a communication master station to control a plurality of communication slave stations, but also can reduce the cost of the communication system with higher communication speed.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
Referring to fig. 1, fig. 1 is a schematic diagram of a protocol conversion card according to an embodiment of the present invention.
A specific embodiment of the present invention provides a protocol conversion card, including: the system comprises a first communication interface module 1, a second communication interface module 2, a processor 3, a dual-port RAM4 and an extension controller 5; the processor 3 is used for encapsulating and analyzing input data and performing virtual switch logic; the first communication interface module 1 is connected with the processor 3, the expansion controller 5 is connected with the processor 3, the second communication interface module 2 is connected with the expansion controller 5, and the first communication interface module 1 and the second communication interface module 2 are used for communicating with corresponding communication equipment outside according to corresponding control signals of the processor 3; the dual-port RAM4 is connected with the processor 3 and used for data interaction with the corresponding frequency converter.
In this embodiment, the processor preferably includes: the BACnet communication protocol processing unit is used for encapsulating and analyzing the BACnet communication protocol data; and the switch logic unit is used for carrying out virtual switch logic processing. The processor is used for converting the communication protocol, and converting a preset communication protocol such as a BACnet communication protocol into a self-defined protocol; and performing virtual switch logic; further, the processor is also used for carrying out repeated IP address detection and communication overtime fault detection, namely carrying out communication card error detection logic; and communication status indication processing and the like. Since only one built-in communication controller is usually provided in the processor, in this embodiment, an extension controller is provided to assist in implementing the dual-port virtual switch function, and further, in this embodiment, it is preferable that the protocol conversion card communicates with an external communication device through ethernet, and the extension controller is an extension ethernet controller.
When the protocol conversion card is used, the protocol conversion card is only required to be arranged in each communication slave station and connected with a frequency converter in the communication slave station where the protocol conversion card is located. Because this agreement conversion card is equipped with two communication interface modules, consequently, can realize two net gape virtual switch functions, a communication slave station can carry out the communication with two communication equipment and connect, and the communication master station can be connected with a communication interface module of arbitrary communication slave station like this, and another communication interface module of this communication slave station can be connected with other communication slave stations, and each communication slave station connects in order then, can realize the control of communication master station to a plurality of communication slave stations. The communication master station can be in communication connection with each communication slave station through a preset protocol such as a BACnet/IP standard protocol, and a protocol conversion card of each communication slave station has a protocol conversion function and is used as a virtual switch to transmit information. Therefore, the communication master station can conveniently control a plurality of communication slave stations, the communication speed is high, and the cost of the communication system can be reduced.
In one embodiment of the invention, the dual port RAM (random access memory) is a CPLD (complex programmable logic device) chip. The CPLD chip is connected with the corresponding frequency converter through a first hardware interface. The first hardware interface is used for electrical connection between the protocol conversion card and the frequency converter, and the function of a double-port RAM is realized by programming through the CPLD chip, so that the cost and the volume are reduced compared with a special double-port RAM.
Further, the first communication interface module comprises a first ethernet interface circuit and a first ethernet hardware interface connected with the first ethernet interface circuit. The second communication interface module comprises a second Ethernet interface circuit and a second Ethernet hardware interface connected with the second Ethernet interface circuit. The first and second ethernet hardware interfaces are preferably RJ45 interfaces.
In this embodiment, the ethernet interface circuit is mainly a network isolation transformer and its related circuit, the RJ45 is two ethernet crystal plugs, and the master station device of the communication master station can be plugged with the RJ45 interface of any ethernet interface module to perform communication control on the slave station device where the protocol conversion card is located.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a frequency converter control system according to an embodiment of the present invention.
Accordingly, an embodiment of the present invention further provides a frequency converter control system, including: n protocol conversion cards provided by any one of the above embodiments, each protocol conversion card being respectively arranged in a slave station device of a corresponding communication slave station and connected with a corresponding frequency converter, n being an integer greater than 0; a master station device located at the communication master station; the master station device and each slave station device are connected in sequence.
As shown in fig. 2, the system includes one master device 21 and n slave devices 22. Each slave device 22 is provided with a protocol conversion card 23 to communicate with the master device 21. The slave devices are connected in sequence as shown in fig. 2, and the slave device at the head of the sequence is connected to the master device.
In this embodiment, the protocol conversion card communicates using BACnet/IP protocol. BACnet/IP is a protocol that combines the LWIP protocol stack and the BACnet protocol stack. For the protocol conversion card, for the data received from the Ethernet interface module, the processor firstly judges whether the data is a broadcast message, if the data is the broadcast message, the processor determines whether to enter a data frame forwarding process according to the online state of another Ethernet interface module of the processor, and then enters a message analysis program; if the data is a non-broadcast message, judging whether the data is a local message, and if the data is the local message, directly entering a message analysis program; if the message is a non-native message, determining whether to perform a message forwarding process according to the online state of another Ethernet interface module of the message, but not entering a message analysis process.
Due to the arrangement of the ethernet interface module, when a message is received, the ethernet interface module which currently receives the message needs to be identified, so that the message is sent to the correct ethernet interface module when the message is responded. The protocol conversion card also has a repeated IP detection function and a communication overtime detection function, detects an Ethernet interface module in a connection state, reports a fault if the IP address of equipment is the same as that of slave station equipment where the protocol conversion card is located, reports the fault if the protocol conversion card is in a communication process and does not receive a BACnet data frame within set overtime, and the fault state is indicated by a state lamp.
The protocol conversion card is connected with the frequency converter through a hardware interface and communicates in the following mode. Since the data exchange between the protocol conversion card and the frequency converter is realized by the dual-port RAM, in the present embodiment, the dual-port RAM is preferably a CPLD chip, and thus the CPLD is divided into different data areas, as shown in fig. 3, the CPLD is divided into four data areas, i.e., a protocol conversion card data writing-out area, a protocol conversion card data reading-in area, a frequency converter identification register, and a protocol conversion card flag register.
The protocol conversion card data writing-out area is a self-defined data frame storage area which is converted after the BACnet/IP data frame received by the protocol conversion card is analyzed; the protocol conversion card data read-in area is a data frame storage area responded by the frequency converter; for the mark register of the protocol conversion card, the protocol conversion card modifies the value of the register according to the data updating state of the data writing-out area of the protocol conversion card, the frequency converter inquires the value of the register to determine whether the protocol conversion card has updating data, if so, the data of the data reading-in area of the protocol conversion card is read, and the data updating state of the data writing-out area of the protocol conversion card is cleared so as to identify the next data reading-in, if the frequency converter has data response, namely, the data reading-in area of the protocol conversion card has new data updating, the frequency converter can update the mark register of the frequency converter so as to facilitate the protocol conversion card to read the updated response data of the frequency converter in time, if the frequency converter identifies that the data updating exists, the data of the data reading-in area of the protocol conversion card is read, and the data updating mark in the mark register of the frequency converter is cleared.
Further, before the conversion card and the frequency converter exchange data, the conversion card and the frequency converter are subjected to handshaking to determine whether the connection between the conversion card and the frequency converter is normal (namely, one party writes data and the other party can read the data in a corresponding memory), the conversion card can enter a normal data transmission state after the handshaking is successful, the protocol conversion card is provided with a watchdog of 1ms, and the watchdog can trigger a reset signal under the condition that the protocol conversion card is halted.
In this embodiment, the handshake process between the conversion card and the frequency converter is as follows: CA _ IND _ REG is protocol conversion card flag register, and INV _ IND _ REG is frequency converter flag register. The frequency converter initially sends a reset signal to initialize and reset the CPLD, the protocol conversion card firstly writes 0xA0 into the protocol conversion card flag register CA _ IND _ REG, the frequency converter reads the value of the protocol conversion card flag register after a certain time, and if the value is 0xA0, the frequency converter writes 0xA0 into the frequency converter flag register INV _ IND _ REG. Continuously reading the value of INV _ IND _ REG by the protocol conversion card until the value is 0xA0, writing 0xF0 into a protocol conversion card flag register CA _ IND _ REG, reading the value of the register after a period of time by the frequency converter, writing 0xF0 into a frequency converter flag register INV _ IND _ REG if the value is 0xF0, and shaking hands on the side of the frequency converter successfully; the protocol conversion card continuously reads the value of INV _ IND _ REG until it is 0xF0, and the protocol conversion card also completes the handshake.
In summary, the frequency converter control system and the protocol conversion card thereof provided by the embodiments of the present invention have two ethernet interface modules, and the protocol conversion card performs protocol conversion and implements a switch function by a processor, and does not need an external switch, and has low cost and a simple and compact structure, i.e., has a packet forwarding function, and implements one-master-multiple-slave communication without accessing the switch.
The present invention provides a converter control system and a protocol conversion card thereof. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the present invention and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (2)
1. A protocol conversion card, comprising: the system comprises a first communication interface module, a second communication interface module, a processor, a dual-port RAM and an expansion controller; the processor is used for encapsulating and analyzing input data and carrying out virtual switch logic; the first communication interface module is connected with the processor, the expansion controller is connected with the processor, the second communication interface module is connected with the expansion controller, and the first communication interface module and the second communication interface module are used for communicating with corresponding communication equipment outside according to corresponding control signals of the processor; the double-port RAM is connected with the processor and is used for data interaction with the corresponding frequency converter;
wherein, the double-port RAM is a CPLD chip; the CPLD chip is connected with the corresponding frequency converter through a first hardware interface;
the processor is also used for carrying out repeated IP address detection, communication overtime fault detection and communication state indication processing;
the first communication interface module comprises a first Ethernet interface circuit and a first Ethernet hardware interface connected with the first Ethernet interface circuit;
the second communication interface module comprises a second Ethernet interface circuit and a second Ethernet hardware interface connected with the second Ethernet interface circuit;
the processor includes: the BACnet communication protocol processing unit is used for encapsulating and analyzing the BACnet communication protocol data; the switch logic unit is used for carrying out virtual switch logic processing;
and the second communication interface module is connected with other communication slave stations so as to realize the sequential connection of the communication slave stations.
2. A frequency converter control system, comprising:
the protocol conversion cards as claimed in claim 1, wherein each protocol conversion card is arranged in a slave station device of a corresponding communication slave station and connected with a corresponding frequency converter, and n is an integer greater than 0;
a master station device located at the communication master station;
the master station device and each of the slave station devices are connected in sequence.
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| CN201611265196.2A CN106657115B (en) | 2016-12-30 | 2016-12-30 | Frequency converter control system and protocol conversion card thereof |
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| CN201611265196.2A CN106657115B (en) | 2016-12-30 | 2016-12-30 | Frequency converter control system and protocol conversion card thereof |
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| CN107968738A (en) * | 2018-01-12 | 2018-04-27 | 深圳市英威腾电气股份有限公司 | A kind of slave, communication expansion card and group network system |
| CN110022380B (en) * | 2019-04-24 | 2022-02-25 | 深圳供电局有限公司 | Access terminal for communication of safety and stability control system |
| CN110247936B (en) * | 2019-08-01 | 2022-07-05 | 深圳市英威腾电气股份有限公司 | Communication protocol conversion card and communication protocol conversion system |
| CN114488871A (en) * | 2021-12-23 | 2022-05-13 | 深圳市海浦蒙特科技有限公司 | Control method, frequency converter and computer readable storage medium |
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| CN202077061U (en) * | 2011-03-24 | 2011-12-14 | 华中科技大学 | Multi-port and multi-network protocol converter |
| US10771532B2 (en) * | 2011-10-04 | 2020-09-08 | Electro Industries/Gauge Tech | Intelligent electronic devices, systems and methods for communicating messages over a network |
| CN103631190A (en) * | 2013-11-05 | 2014-03-12 | 上海交通大学 | Monitoring system based on EtherCAT network |
| US9373243B2 (en) * | 2014-01-03 | 2016-06-21 | Intwine Connect, Llc | Connected gateway for an abatement device processing raw data |
| CN104375484B (en) * | 2014-11-13 | 2017-05-03 | 深圳市汇川控制技术有限公司 | Distributed control system based on CAN open protocol |
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| CN103529804A (en) * | 2013-10-25 | 2014-01-22 | 深圳市汇川控制技术有限公司 | Distributed control system based on EtherCAT bus |
| CN104753958A (en) * | 2015-04-17 | 2015-07-01 | 深圳市英威腾电气股份有限公司 | Card and method for converting communication protocols |
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