RU94097U1 - MULTI-PORT NETWORK SWITCH FOR WORK IN THE CONDITIONS OF UNDERGROUND COAL PRODUCTION - Google Patents

Abstract

 Multiport network switch for underground coal mining, comprising a housing, a processor unit, an RS-485 interface transceiver unit, an Ethernet transceiver unit, characterized in that it also includes a universal asynchronous transceiver unit, an intrinsic safety barrier, a TCP / IP stack, 16 -port Ethernet switch, block of connectors for optical cables, two connectors for cables with twisted pair, nine cable entries, with the first input-output of the universal asynchronous transceiver block RS-485 interface transceiver unit, intrinsic safety barrier and the first cable entry connected to the automated process control system equipment; the second input-output of the universal asynchronous transceiver unit is connected to the first input-output of the processor unit, the second input-output of which is connected via the TCP / IP stack to the first input-output of the Ethernet transceiver unit; the second input-output block of the Ethernet transceiver unit is connected to the input-output of the 16-port Ethernet switch, the inputs and outputs of the third to eighth Ethernet transceiver block through the block of connectors for optical cables and cable entries from the second to the seventh are respectively connected to the control system equipment; the ninth input-output of the Ethernet transceiver unit through the first connector for the twisted pair cable and the eighth cable entry, as well as the tenth input and output of the Ethernet transceiver unit through the second connector for the twisted pair cable and the ninth cable input, are connected to equipment located outside the mine; in addition, the housing has an increased degree of protection IP 54.

Description

This utility model relates to the field of automated monitoring and control systems, in particular, to devices designed for the continuous exchange of information between automated mining equipment installed in a coal mine hazardous for gas (methane) and coal dust and equipment of an automated system supervisory control on the surface.

One of the devices known in this field is the Hirshmann RS2-4R family of switches (K. Kruglyak. Local networks in industrial control systems: faster, further, more reliable. "STA. Modern Automation Technologies", No. 1, 2003, p. 6-13; Prosoft product catalog 2005/2006, p. 11 / 11-11 / 14).

RS2-4R switches are designed to form an Ethernet data network, can operate in a wide temperature range (from -40 ° C to 70 ° C), they include options with a port for single or multimode fiber optic cables, which greatly expands the scope switches. The disadvantage of RS2-4R switches is that they provide communication between ACS equipment only through the Ethernet port, which is not enough to implement a single enterprise network, as ACS often has a significant number of devices connected via the RS-485 interface.

Also known is the class of serial interface converters with an expanded set of functions NPort 6000 of MOHA firm (http://www.moxa.ru/good/listAll/14886/; BYTE Russia No. 101, February 2007, p. 5). The 6000 converters interact with both RS-232/422/485 interfaces and support Ethernet with a data transfer rate of 10 and 100 Mbps, the physical implementation of the Ethernet channel is a single-mode or multi-mode fiber optic cable, SC connector, or a copper cable ”, RJ-45 connector.

The authors selected the NPort 6250-M-SC converter as a prototype. The converter has two ports for RS-232/422/485 serial interfaces with DB 9 connectors for copper cables with twisted pair and one Ethernet port with SC connector for multimode fiber optic cable. Operating temperature of the NPort 6250-M-SC converter from 0 ° С to 55 ° С, relative humidity from 5% to 95%, overall dimensions 77 × 111 × 28 mm, weight 730 g.

The specified technical solution is the closest to the claimed utility model and is accepted by the authors as a prototype.

This well-known solution for data transfer with conversion from RS-485 to Ethernet and vice versa has rather high technical characteristics and is widely used in automation systems, but it does not meet the requirements for mining equipment - it does not provide explosion protection and intrinsic safety, the case does not protect from coal dust and hostile environment and, in addition, it has only one Ethernet port, which limits the reliability of the data transmission system, depriving it of redundancy.

The utility model proposed by the authors “Multiport network switch for operation in underground coal mining” (hereinafter referred to as the Switch) allows us to solve the following problem: create a new explosion-proof switch for operational, highly reliable, remote data exchange between devices with RS-485 interface with subsequent data transmission over the network Ethernet and vice versa, for working in underground coal mining, while reducing the range of additional switching devices and facilitating programming, installation and commissioning.

When implementing the proposed device, the following technical result can be obtained: improving the reliability and reliability of the control and management of technological equipment of data transmission systems, including in underground workings in the presence of gas and coal dust; reducing the time of diagnosis and increasing the period of overhaul operation.

The specified technical result is achieved by changing the structure and expanding the scope of the claimed device, a higher degree of housing protection, introducing intrinsically safe barriers, which makes it possible to use it for work in underground coal mining in mines with coal dust and methane.

The essence of the utility model is illustrated in figure 1, which presents a structural diagram of the inventive device.

According to figure 1, the inventive device is structurally made in the form of a separate unit placed in the housing 1. Inside the housing 1 are the processor unit 2 and the universal asynchronous transceiver unit 3, the first input-output of which is through the transceiver unit of the RS-485 interface 4 , the intrinsic safety barrier 5 and cable entry КВ1 are connected with the equipment of the industrial control system. The second input-output of the transceiver unit 3 is connected to the first input-output of the processor unit 2, the second input-output of which is connected via the TCP / IP 6 stack to the first input-output of the transceiver unit of the Ethernet interface 7. The second input-output of the receiver unit Ethernet-interface transmitters 7 is connected to the input-output of the 16-port Ethernet 8. The inputs and outputs from the third to the eighth Ethernet transceiver unit 7 through the optical cable connector block 9 and the cable entries KB2 ... KB7 are respectively connected to the control system equipment. The ninth input-output of the Ethernet 7 transceiver unit through the cable connector with twisted pair 10 and cable input KB 8, as well as the tenth input-output of the Ethernet 7 transceiver unit through cable connector for the twisted pair cable 11 and cable input KB 9 are connected with equipment placed on the surface of the mine.

Common with the prototype signs of the claimed device: the presence of the housing 1, the processor unit 2, the transceiver unit of the RS-485 4 interface and the transceiver unit Ethernet 7.

Distinctive features from the prototype are the additionally introduced universal asynchronous transceiver unit 3, intrinsic safety barrier 5, TCP / IP stack 6, 16-port Ethernet 8 switch, connector block for optical cables 9, cable entries KB1 ... KB9. Moreover, the first input-output block of the universal asynchronous transceiver 3 through the transceiver block of the RS-485 interface 4, the intrinsic safety barrier 5 and cable entry KV1 is connected to the equipment of the industrial control system. The second input-output block of the universal asynchronous transceiver 3 is connected to the first input-output of the processor unit 2, the second input-output of which is connected via the TCP / IP 6 stack to the first input-output of the Ethernet 7 transceiver block. The second input-output of the block Ethernet 7 transceivers are connected to the input-output of the 16-port Ethernet 8. The inputs and outputs of the third to eighth block of Ethernet 7 transceivers through the block of connectors for optical cables 9 and cable entries KB 2 ... KB 7 are respectively connected to ACS equipment TP The ninth input-output of the Ethernet 7 transceiver unit through the cable connector with twisted pair 10 and cable input KB 8, as well as the tenth input-output of the Ethernet 7 transceiver unit through cable connector for the twisted pair cable 11 and cable input KB 9 are connected with equipment placed on the surface of the mine. In addition, the housing 1 has an increased degree of protection IP 54.

In dynamics, the claimed device performs all the necessary functions in accordance with the algorithm of its operation, which is recorded in the Flash memory of the processor unit 2. Through cable input КВ1 from the automated control system equipment, which has an output via the RS-485 interface (in the coal mine - complex distribution explosion-protected switchgear devices КРУВ -6M, the monitoring system of treatment plants SMoK-1, etc.) and the intrinsic safety barrier 5 information is transmitted to the transceiver block of the RS-485 interface 4. The transceiver block of the RS-485 4 interface provides buffer expansion the language of the received signals and the transmission of information to the unit of the universal asynchronous transceiver 3, which performs the unpacking of the received data packets and identification of bit information of each packet. The obtained results are transmitted via the 8-bit bus to the inputs of processor unit 2. Processor unit 2 analyzes the received information for compliance with the exchange requirements via the RS-485 interface and, depending on the information received, either redirects the received packet back to the RS-485 interface network, but to another address, or it converts it into Ethernet 10/100 packets and sends it to the TCP / IP 6 stack. The TCP / IP 6 stack performs the functions of a packet decoder, i.e. only accepts packets with an IP address destined for this Switch. With a satisfactory decoding result, the tested packets are sent to the inputs of the Ethernet 7 transceiver unit, while the 16-port Ethernet 8 switch connected to them provides packet switching and forwarding, so that information from the transceiver outputs goes to the SC 9 ... 14 connectors for fiber cables associated with the equipment specified in the address field of the package. When using fiber-optic cable as a transmission medium, the installation of intrinsic safety barriers for working in coal mines is not required due to the high noise immunity of communication lines from electromagnetic interference. The introduction of three redundant fiber optic cables allows you to organize a redundant communication line via Ethernet. In addition, the Switch provides Ethernet communication with equipment on the surface of the mine through twisted-pair cables, for which Ethernet 7 transceiver outputs to RG-45 copper connectors are provided.

The switch can be used in underground coal mining, for which the Switch case has an increased degree of protection IP 54, the RS-485 inputs and the outputs of the fiber optic Ethernet cables are made through cable entries КВ1 ... КВ7, while the RS-485 inputs have intrinsic safety barriers 5. When the use of intrinsic safety barriers is not required as a transmission medium for an optical fiber cable; the use of such a cable allows one to obtain a high noise immunity of the line from electromagnetic interference. Each channel has a backup (backup) communication line, laid in a different way. The processor unit 2 automatically checks the integrity of the communication lines and, if broken, switches to the backup line.

The algorithm for the operation of the Switch is determined and adjusted in accordance with the requirements of the "Safety Rules in Coal Mines" PB 05-618-03. The creation and modification of the operation algorithm is performed on a specialized SCADA system by the mine operating service. Recording of the modified functioning algorithm is carried out by transmitting data to the selected Switch through a mine data network. A description of the operation of the Switch is set in graphical form by drawing a diagram of the available standard elements.

Specific device implementations.

The main technical characteristics of the Switch are given in the table.

Table Parameter Specifications exchange of information on: Ethernet 10/100 standard - Three redundant fiber optic cables *; IEEE 802.3 Industrial Ethernet - two twisted pair cables ** RS-485 interface information exchange on eight channels *** exchange speed 2400, 4800, 9600, 19200, 38400, 56700 bit / s Ambient temperature from minus 20 ° С to 40 ° С Upper relative humidity 98% moisture condensation Degree of protection against dust and moisture IP 54 Weight, no more, kg 7 Overall dimensions of the Switch, no more than, mm 222 (width) × 360 (length) × 120 (height). Notes:
* Communication via multimode fiber optic cable at a distance of up to 2000 m;
** communication with equipment on the surface;
*** intrinsically safe circuit, communication line length up to 1200 m.

The main core of the Switch is the processor unit 2. Its functions include receiving and transmitting packets to a 16-port Ethernet 8 switch, receiving and transmitting packets to eight inputs of RS-485 4 interface transceivers, and implementing algorithms for monitoring integrity lines of data transmission lines , finding the shortest paths in the data transmission network, performing the functions of automatically switching to the backup data line laid along the backup route.

The Switch was manufactured on commercially available components, in particular, as a processor unit 2, a digital signal processor DSP from Freescale Semiconductor was used, the device uses terminal connectors from WAGO and hermetic cable glands from RST.

Claims (1)

Multiport network switch for underground coal mining, comprising a housing, a processor unit, an RS-485 interface transceiver unit, an Ethernet transceiver unit, characterized in that it also includes a universal asynchronous transceiver unit, an intrinsic safety barrier, a TCP / IP stack, 16 -port Ethernet switch, block of connectors for optical cables, two connectors for cables with twisted pair, nine cable entries, with the first input-output of the universal asynchronous transceiver block RS-485 interface transceiver unit, intrinsic safety barrier and the first cable entry connected to the automated control system; the second input-output of the universal asynchronous transceiver unit is connected to the first input-output of the processor unit, the second input-output of which is connected via the TCP / IP stack to the first input-output of the Ethernet transceiver unit; the second input-output block of the Ethernet transceiver unit is connected to the input-output of the 16-port Ethernet switch, the inputs and outputs of the third to eighth Ethernet transceiver block through the block of connectors for optical cables and cable entries from the second to the seventh are respectively connected to the control system equipment; the ninth input-output of the Ethernet transceiver unit through the first connector for the twisted pair cable and the eighth cable entry, as well as the tenth input and output of the Ethernet transceiver unit through the second connector for the twisted pair cable and the ninth cable input, are connected to equipment located outside the mine; in addition, the housing has an increased degree of protection IP 54.