CN111147612B

CN111147612B - Fan group control address automatic allocation method based on position information

Info

Publication number: CN111147612B
Application number: CN201911215820.1A
Authority: CN
Inventors: 计国良; 赵文军; 任彧
Original assignee: Hangzhou Dunli Store & Display Fixtures Co ltd; Hangzhou Dunli Electric Appliances Co ltd
Current assignee: Hangzhou Dunli Store & Display Fixtures Co ltd; Hangzhou Dunli Electric Appliances Co ltd
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2022-05-27
Anticipated expiration: 2039-12-02
Also published as: CN111147612A

Abstract

The invention relates to a fan group control address automatic allocation method based on position information. The invention is based on the RS485 MODBUS protocol, and realizes the automatic address allocation method of the fan group control with distance and position information. The system is characterized in that a plurality of fans are connected through an RS485 bus, an uplink interface of a 1 st fan is connected with a gateway or a computer, and a downlink interface is connected with a 2 nd fan and is sequentially connected with all the fans; the method firstly isolates signals of an uplink interface and a downlink interface of each fan, configures an initial address for the No. 1 fan through a gateway, sets the uplink interface and the downlink interface of the fan as a passage, and sequentially adds the address and configures the rest fans. In order to overcome the defect that the fan is not connected with a power supply bus, the invention designs the normally closed interface for physically connecting the uplink interface and the downlink interface, the fan control system can control the states of the uplink interface and the downlink interface, the address allocation algorithm also increases error check, and the new fan is added with an automatic address allocation function.

Description

Fan group control address automatic allocation method based on position information

Technical Field

The invention belongs to the technical field of address allocation based on MODBUS protocol, and relates to a method for automatically allocating a fan group control address based on position information.

Background

In the fields of industrial control, power communication, intelligent instruments and the like, data exchange is generally carried out in an RS485 communication mode. Because the industrial field is more complicated, various electrical equipment can produce more electromagnetic interference in the environment, can lead to signal transmission mistake, along with industrial application communication is more and more, Schneider electric has formulated a bus protocol MODBUS protocol that is used for the industrial field, uses the MODBUS protocol in the RS485 communication occasion in the industry now and adopts in many. The MODBUS protocol is a general communication language applied to electronic controllers, and it has become an industry standard that controllers can communicate with each other, controllers and other devices via a network (e.g., ethernet). Control devices produced by different manufacturers can be connected into an industrial network for centralized monitoring and management.

The RS485 communication adopts a half-duplex communication mode, only one device has the right of using the bus, and no matter whether the device is a main sender or a slave receiver, if the device sends information at the same time, the information received by other devices is wrong, because the RS485 communication physically superposes signals, the MODBUS protocol requirements are not met. MODBUS protocol defines a data structure that the controller can recognize, describes the process of the controller requesting access to other devices, how to respond to requests from other devices? How to detect the error log defines a common format for the layout and content of the communication data. In the case of multi-machine communications, the MODBUS protocol specifies that each controller must know their device address, recognize data sent from the address, determine whether to take action, what action to take? If the controller responds, the controller generates feedback information which is sent by the MODBUS protocol.

How to solve the problem that the device address of multi-machine communication under the MODBUS protocol is unique? At present, a plurality of methods exist, namely setting addresses by using a dial switch, setting equipment addresses one by using a computer, inquiring the state of a bus through software, continuously waiting for an idle state, and redistributing address conflicts, and the methods have no association of addresses and position information, some methods need to be set by an off-network single machine, are time-consuming to process, are inconvenient to operate on site, seriously affect the efficiency of RS485 communication, and are easy to make mistakes.

Disclosure of Invention

The invention provides a fan group control address automatic allocation method based on position information, aiming at solving the technical defects that the equipment address of multi-machine communication under an MODBUS protocol is unique and the equipment address is related to physical position information, and achieving the purpose of allocating the equipment address of a fan in sequence (increasing sequence/decreasing sequence) according to the position information of the fan without manual intervention, and finally realizing the accurate allocation of the address of all fans in a network, wherein the specific realization process is completed by commands of physical connection, address allocation sending, allocation completion and the like.

The implementation of the invention specifically comprises the following steps:

firstly, RS485 master control equipment (FFU gateway) is connected with a plurality of network fan buses, MODBUS protocol is adopted to realize multi-fan communication, the FFU gateway is connected with an uplink interface of a first fan, a downlink interface of the first fan needs to be connected with an uplink interface of a second fan, all fans in the network are connected in sequence, and finally the downlink interface of the fan can be disconnected with the equipment;

step two, the FFU gateway sends an address allocation command to the fans in the network, and the first fan receives the address allocation command of the FFU gateway and determines whether the local address allocation command needs to be answered or not in combination with the state of the fan? If the fan does not allocate the address, responding to receive an address allocation command, and waiting for the network address allocated by the FFU gateway;

step three, if the fan address allocation is completed, judging whether the uplink and downlink interfaces of the fan are connected? If not, the fan connects the up and down interfaces and transmits an address assignment command to the next fan;

step four, the FFU gateway sends an address allocation command to each fan which is not allocated with an address in the network, each fan gives a unique network address, and the network address is increased or decreased progressively according to the physical position information until the address allocation of the last fan is completed;

step five, the FFU gateway carries out address uniqueness verification on the fan in the network, sends an address verification command and finds whether an allocated address exists in the network? Is there a plurality of fans using the same network address? If the address allocation state is the allocation state, the uplink interface and the downlink interface are closed; if the address uniqueness verification is passed, the step seven is carried out; otherwise, entering the step six for processing.

Step six, the FFU gateway needs to verify how many fans on the network are in communication with the gateway, if a plurality of fans exist, the address re-distribution command is broadcasted and sent again, and after only one fan can receive FFU gateway data, the step two is switched;

step seven, the FFU gateway verifies the completeness of address allocation of the fans in the network, the fans in the network are guaranteed to obtain own addresses in the address allocation, and if the fans do not update the addresses, the second step of allocation is skipped; the address allocation of all fans in the network is completed, the FFU gateway sets the network to be in an address allocation completion state, and the whole FFU network can receive the command of the gateway and the feedback information of the fans.

Drawings

FIG. 1 is a diagram of an RS485 interface;

FIG. 2 is a diagram of an FFU network topology;

FIG. 3 is a general flow chart of address allocation;

fig. 4 is an allocation flow chart.

Detailed Description

As shown in fig. 1, the fan has an uplink interface and a downlink interface, and the default state is normally closed, which allows MODBUS protocol data to be transmitted from the fan interface to the next fan.

As shown in fig. 2, the FFU gateway is connected to a plurality of network fans by a bus, and the MODBUS protocol is used to implement multi-fan communication, the FFU gateway is connected to an uplink interface of a first fan, and a downlink interface of the first fan needs to be connected to an uplink interface of a second fan, and is connected to all fans in the network in sequence, and finally the downlink interface of the fan may not be connected to the device.

The FFU network is initially established, the FFU gateway needs to distribute addresses to all fans in the network, the addresses are transmitted between the gateway and the fans through a series of commands, the address flow is used as shown in figures 3 and 4, the total flow of address distribution is realized, the system is networked, and the network configuration steps are as follows: initializing a gateway, and connecting the gateway and a 1 st fan uplink interface; connecting a downlink interface of a 1 st fan with an uplink interface of a 2 nd fan, and sequentially connecting all fans in the system; setting a starting address, and allocating a next new address until the last fan is allocated; does it check if the allocation is complete? Otherwise the system may be reallocated.

The implementation process of address allocation is embodied, and the specific flow of the expressed implementation allocation method is as follows: an FFU gateway carries out address uniqueness verification on a fan in a network, sends an address verification command and finds whether an allocated address exists in the network? Is there a plurality of fans using the same network address? If the address allocation state is the allocation state, the uplink interface and the downlink interface are closed; if the address uniqueness verification passes, the FFU gateway performs address allocation completeness verification on the fan in the network to ensure that the fan in the network obtains its own address in the address allocation, and if the fan does not update the address, the FFU gateway sends an address allocation command to the fan in the network, and the first fan receives the address allocation command of the FFU gateway and determines whether the local address allocation command needs to be answered or not in combination with the state of the fan? If the fan does not allocate the address, responding to receive an address allocation command, and waiting for the network address allocated by the FFU gateway; the address allocation of all fans in the network is completed, the FFU gateway sets the network to be in an address allocation completion state, and the whole FFU network can receive the command of the gateway and the feedback information of the fans.

Is the blower in the network send an address assignment command, if the assignment of the blower address is completed, determine if the uplink and downlink interfaces of the blower are connected? If not, the fan connects the up and down interfaces and transmits an address allocation command to the next fan;

the FFU gateway sends an address allocation command to each fan which is not allocated with an address in the network, each fan gives a unique network address, and the network address is increased or decreased progressively according to the physical position information until the address allocation of the last fan is completed;

the FFU gateway needs to verify how many fans on the network are in communication with the gateway, if a plurality of fans exist, the address re-allocation command is broadcast and sent again, after only one fan can receive FFU gateway data, the FFU gateway is switched to send the address allocation command to the fans in the network, and address re-allocation is started from the 1 st fan.

When a new fan is added into the network, the FFU gateway automatically detects that the system needs to carry out address allocation on all fans in the network, each fan enters an address allocation state by changing the state of the fan, and the FFU gateway sends an address allocation command to the fans in the network and starts to carry out address allocation again from the first fan.

Claims

1. A fan group control address automatic allocation method based on position information is characterized in that: the method specifically comprises the following steps:

firstly, RS485 master control equipment, namely an FFU gateway is connected with buses of a plurality of network fans, MODBUS protocol is adopted to realize multi-fan communication, the FFU gateway is connected with an uplink interface of a first fan, a downlink interface of the first fan needs to be connected with an uplink interface of a second fan, all the fans in the network are connected in sequence, and finally the downlink interface of the fan can not be connected with the equipment;

step two, the FFU gateway sends an address allocation command to fans in the network, the first fan receives the address allocation command of the FFU gateway and combines the state of the fan to determine whether to respond to the address allocation command, if the fan does not allocate an address, the first fan responds to receive the address allocation command and waits for the network address allocated by the FFU gateway;

thirdly, if the fan address allocation is finished, judging whether the uplink and downlink interfaces of the fan are communicated, if not, communicating the uplink and downlink interfaces of the fan, and forwarding the address allocation command to the next fan;

fifthly, the FFU gateway verifies the uniqueness of the address of the fan in the network, sends an address verification command and verifies whether the distributed address exists in the network or not and whether a plurality of fans use the same network address or not; if the plurality of fans use the same network address, broadcasting and sending a command for reallocating the address, changing the address allocation state into the address allocation state after each fan receives the command, waiting for a moment, and closing the uplink and downlink interfaces; if the address uniqueness verification is passed, the step seven is carried out; otherwise, entering the step six for processing;