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Control Global (12/06/2020)
Advanced physical layer standard to make field-level Ethernet a reality
… The APL Project’s new standards for intrinsic safety will be known as “Ethernet-APL.” Further, the IEC PT 60079-47 technical committee is working on a technical specification called Two-Wire Intrinsically Safe Ethernet (2-WISE) to fulfill the requirement of intrinsic safety for loop-powered and separately powered devices in hazardous areas up to Zone 0, 1 and 2/Division 1 and 2.
Semiconductor Engineering (14/05/2020)
Doing More For Less With Upgraded LON Networks
… If you are a facility manager, systems integrator or OEM familiar with LON networks, then you understand the many benefits of this robust, proven communications technology, originally developed by Echelon Corporation and now an open ISO/IEC standard with worldwide adoption. LON enables open, reliable and efficient data transmission with true peer-to-peer communications.
Electronic Specifier (25/05/2018)
GMR isolation boosts Profibus
Profibus is the world’s most accepted field bus with over 50 million nodes in operation. Originally developed in Germany and registered as DIN 19245 in 1989, the International Electrotechnical Commission (IEC) recognises Profibus and its various interconnection formats in IEC 61158.
The field bus employs the development trend of the project
First, give play to the total collinear advantage of scene through application technology
The superiority of the on-the-spot bus system is numerous. Should stress first the field bus reduces systematic cost of investment and advantage of reducing the running cost. This is very important, there is this basic thought, while carrying on choice and network design of the bus line type, there is a clear direction. But always this collinear advantage of scene could be given play to, use the field bus, gives full play to the latent energy of it and has something to do with the user possibly.
Second, make with typological field bus up, favorable to to lower costs
Different kinds of scene always collinear to compare, choose different bus line to lower the system cost to different situations to the maximum extent briefly; Location type bus line (Sensor Bus or Bit-Bus) : AS-I, the simple bus line of byte of I/0 module (Device Bus or Byte-Bus) of switch amount : Device Net, switch quantity and analog quantity I/0 module, are suitable for PLC employing or proceeding control and employ the bus line of data flow (Ful l Function Bus or Block-Bus) : Foundation Fieldb us, have strange the intersection of switch and quantity and apparatus, I/O of analog quantity, of functional block, suitable for course control bit type total collinear ability very limited, it is impossible to use location type bus line as the information transmission body of the large scale system. But its advantage in cost, the speed,etc. is irreplacable for other high-level bus lines. So it often uses with other bus lines in admixture.
Users may worry, will use many kinds of field buses and will make the operation, management of the overall system complicated. Some general man-machine interface software now of reality, support many kinds of field buses, so reach this floor of the man-machine interface, different total collinear differences are not big for user.
Third, the total collinear essence of scene is the information processing scene
A control system, no matter adopt DCS or and adopt the field bus, information volume that the system needs dealing with is much equally at least. In fact, after adopting field bus and intelligent instrument, can be from receiving more diagnosis, maintenance and administrative information live. The information volume of the on-the-spot bus system has increased greatly, but the cable of transmitted information has been reduced greatly. This demands to improve ability of the transmitted information of the cable, transmission of reduction redundant information greatly on one hand. On the other hand should let a large amount of information be finished dealing with in situ on the scene, come and go to reduce the information between scene and control room.
If only construe as saving field bus several cables, it is the essence not understanding it. The scene of information processing is intelligent instrument and field bus grail, also a technical sign of different and other compunication of the field bus.
Fourth, design of network
The general control system has a question of network designs too, the focal point of the network design is to consider the communication network and input, output the arrangement of the cable network from physical shape. Mention a lot of scene total collinear network linear in shape, node at the every a series of subnet section it counts to be limited above. Because the node on the subnet section is counted less, so except considering physics of the network is fixed up, also consider reducing coming and going and transmitting in the network of information.
It is an important principle of network design and systematic configuration in an on-the-spot bus system that the ones that reduce information are transmitted. Reduce information to come and go and can often bring the advantage which improve systematic response time. So should have priority mutual the intersection of information exchange amount and old node when the network design, put in the same branch. For example multiloop while regulating, the node of a regulation loop should try hard to put in the same branch.
Fifth, systematic configuration fool
Some on-the-spot instruments with field bus hold a lot of functional blocks now, though the homogeneous functional block of different products will differ on the characteristic slightly, is an objective reality that there are a lot of functions and is similiar to the situation in the functional block on a network branch. Choose the functional block on the on-the-spot instrument of any one, it is the problem that the systematic configuration should be solved. The principle of considering this question is, try hard to come and go to reduce the information on the bus line. Generally can choose functional block at the related to this function the intersection of information output and the instrument at most.
The configuration of the on-the-spot bus system is more complicated at present, there are many parameters of configuration, the relation between every parameter is more complicated, very familiar with the field bus, it is very difficult to set up the system to the optimum behavior. Obviously, the masses of users are unsatisfied with this kind of state. Too hard, in order to make systematic the intersection of configuration and " the fool " progressively on-the-spot manufacturer of bus system .
The foreign field bus employs the embodiment two
Employ the embodiment one: Conversion using AnyBus serial gateway to realize Modbus Plus to Profibus. The question is proposed: Lie in Swiss West Lars (Vasteras) Famous in Rema Control AB saw rub apparatus automatic solution provider. In a project, the client requirement upgrades the whole factory to a system formed by Siemens S7 control device and Profibus-DP bus. However, the Off-The-Shelf saw deals with the measuring system to still use too outdatedly to guide health PLC (Modicon) ,And is connected to Modbus Plus network. This system work is good should keep, but other parts of the factory should carry on the staging. For this reason, Rema Control Company must seek a kind of solution, realizes and passes the new Profibus-DP network it to the machine format access of existing Modbus Plus network. Solution: Rema Control Company utilizes AnyBus serial gateway to transform the data into Profibus network from Modbus Plus network through two steps. A Modbus Plus serial gateway carries on the machine format import and export of 32 bytes in Modbus Plus network as the adapter of Modbus Plus network. Close Profibus network as a Profibus slave station on Profibus side, configure to the machine format import and export of 32 bytes too. Then utilize RS-422 serial port to set up the intraconnection which realizes two AnyBus gateways. Modbus Plus gateway is set up as Modbus RTU top management mode, Profibus gateway configured to Modbus RTU and is subordinate to the mode on its bunch of column rule. Lennart Hedman, director of system integration, Company of Rema Control, show " the intersection of AnyBus and gateway help us solve one thorny the intersection of customer and difficult problem, make our customer incorporate the existing measuring system in new Siemens S7 automated system. The flexible arrangement of AnyBus gateway can realize some particular data of system selection from Modbus Plus, combine and map these data to Profibus and hit through another gateway very easily " . Supplement the suggestion: HMS Company can offer simpler way to realize two inhouse networks are interconnected at present. The newest AnyBux-X series products can realize the interlinkage of two arbitrary inhouse networks on condition that hardly need any arrangement. Employ the embodiment two: Realize RS232 and communication of Profibus are changed under Modbus top management mode. This example has shown a sport control device with Modbus RTU serial agreement. AnyBus serial gateway reads the write data from the sport control device as master control set of ModBus. In AnyBus serial net turns off the command procedure of the configurator, ModBus master control set carries on the disposition to its list of scanning. AnyBus configurator define all ModBus command, register, data shine upon with preface in time. Later, AnyBus serial gateway controlled ModBus communication of the sport control device, and carried on the I/O through the built-in Profibus interface selecting data. Through this interface, the data are transmitted to Fieldbus main installation and PLC control device through Profibus. In the picture: 1. Data byte of the apparatus serial port output. 2. AnyBus serial gateway deals with the bottom layer Handshaking signal and data validation check-up (CRC) ,Guarantee not to know the error code in data. From all effective data that serial device get, deposit AnyBus in the serial gateway one's own memorizer it. If the data are invalid, AnyBus will require the serial apparatus ( RS232) automatically Retransmission. Guarantee to choose to transmit from the memorizer to the machine format exactness of Fieldbus main installation like this. 3. Data byte that PLC Fieldbus main installation receives. Notice AnyBus serial gateway only sending a part of the data flow received from the serial apparatus. 4. Data byte received from PLC Fieldbus. These bytes are used in PLC the input / output data from Fieldbs network. Stored and dealt with only from the real data of serial equipment selection by PLC. From the viewpoint of PLC, it is a serial interface in fact that PLC can ignore the sport control device, and regard it as having interface of built-in Profibus. Not this Profibus in pieces of example change to last Ethernet,it can SSI script or Java utility programs based on network server, choose the data in Anybus serial gateway memorizer to read and write, make the temperature regulator run online through the network. http://www.fieldbuses.com/n1992c46.aspx
On the basis of the application in the cut-off machine of continuous casting of frequency converter of Siemens of PROFIBUS
A foreword The third steel mill of Jinan Steel Copany group is Jinan Steel Copany group " 15 " The key investment project during this time, it was first-class advanced apparatus and automatic control technique outside China that was introduced, first-class, international most advanced level is equipped and reached China in it. In the converter, continuous casting automation control system, have employed many kinds of bus lines (Profibus, ControlNet, Devicenet) according to the needs of total collinear characteristic and system of scene Field bus control system (FCS) formed ,The control system of these bus line has provided the safe and reliable solution for converter, continuous casting system. Conticaster No. 1 is to introduce VAI (steel of is united) Slab conticaster,it is China at present one of having the most advancedly technology, automaticity highest, auxiliary facility complete conticaster most, what its system of cut-off machine chose is the field bus control system based on that MM440 frequency converter of PROFIBUS form. 2 conticaster control systems Three steel-making projects including molten iron of Jinan Steel Copany is dealt with, a plurality of projects such as 120t converter, LF/VD refining and slab conticaster, the disposition of automatic control system of EIC three electricity of the whole factory reaches the advanced international standards. The conticaster system accomplishes the integration of three electric automation control, includes the process control level L2 and foundation and controls L1 grade and L0, reserve interfacing with communication of L3 grade and data preserving area at the same time, divide and state the tertiary system as follows as follows. 3 grades of (Lelvel3) : Production planning it is the whole to make for factory, coordinate products and products tracing,L3 be lasted three steel mills of every production processes system and behind hit by thick plank workshop, the realization of L3 system needs every craft unit, product control and managing the actual conditions that the department combine the factory to consider, set up the project separately, unified and coordinated. 2 grades of ( Lelvel2) : The computer operation guidance of every craft control unit, the settlement of the special technological process calculates and the data collection of the technological process. A grade of ( Level1) : Real-time control stage, according to the operation order, the testing signal of calculating in settlement of the process computer and on-the-spot component, finish logic sequence control and PID for producing apparatus to regulate. 0 grades of ( Level0) : Mainly control, I/O which transmits apparatus are controlled and managed for L0 grade. In the modernized control system, the drive mechanism (frequency conversion is fitted) of AC/AC By the digital device control and monitoring of one's own self-carrying CPU, and carry on data communication with L1 grade on the net. The automated system that L0 reaches L3 grade finishes the production planning of the whole factory, product control, the interface of craft district coordinates, process optimization and device control, can realize the production automation of the whole factory, see Fig. 1. Mechanically controlled system architecture of continuous casting of Fig. 1 3 cut-off machine control systems 3.1 The cut-off machine apparatus makes up The cut-off machine of conticaster No. 1 is a unit of equipment introduced from Germany GEGA Company, it is a flame cut-off machine, its main function is to cast the base to cut into triquetum or one time of ruler length, and can cut base head, base end and sample. With guide spindle blade, cast base according to draw the intersection of base and speed, enter cutting area separate, flame cut-off machine cut away the intersection of 300mm and about crop of length, fall into the lower crop collecting box, casting the base to cut according to the ruler length of the triple of the requirement after the crop is cut. While cutting, lean against the holding device, flame cut-off machine and casting the base to walk synchronously, cast the base length to measure through measuring the roller, cut and go on automatically, and consider the length of second automated system is optimized. Integrated devices of electromechanics with related self-controlling system such as the cut-off machine system including machinery, energy medium supplying with and controlling, electric instrument control,etc.. The cut-off machine is made up of following apparatus: The supporting structure of the cut-off machine, cut the mechanical equipment, the energy medium supply is controlled, cast the measuring set of the base length, electric control system, hot safeguard. 3.2 Technological process of the cut-off machine The technological process of the cut-off machine is generally cut three pieces of course to make up by head cut of base, triquetum cut, base end. The most master triquetum cuts the technological process as follows: 500mm dolly dropped in advance before counted and close to triquetumsing as measuring the wheel, one pair of rifles is moved inwards at the same time after putting in place, when visiting and touching and casting the outer cover of base, preheat oxygen, preheat the coal gas to open and preheat, it is non-actions to cut rifles within this period of time, after totally reaching the triquetum, the dolly drops in place ' Push down and cast the base) ,Open, cut oxygen, carry on cut at the same time, with original to cut, cut rapidly first ,Cut 50mm, carry on cut at full speed, one pair of rifles is apart after 120mm meets, rifle No. 2 closes and cuts oxygen, stop cutting and returning to the primitive location, close all mediums, is continued cutting by rifle No. 1, mostly rifle No. 1 stops cutting too, closes all mediums and returns to the primitive location after cutting 10mm, the dolly rises the cart goes backwards and returns to the primitive location at the same time, wait for the next triquetum. 3.3 Cut-off machine control system ( 1) Cut-off machine control system. The automatic control system of the cut-off machine adopts a Taiwan Siemens S7-300 and a PCS smart 1200 touch-sensitive screen to form, join PLC and L1 grade control system through module and TCP/IP agreement of industrial Ethernet, frequency converter and PCS1200 touch mould reject communication, meet picture 2 show through the intersection of Profibus-DP and interface and MM440. Cut-off machine control system of Fig. 2 ( 2) Main transmission of the cut-off machine The walking of the cut-off machine: A SIEMENS MICROMASTER 440 type frequency converter pulls two 0.75kW electrical machineries, the electric electrical machine thermoswitch is protected, each electrical machinery has an electromagnetic shoe brake coil, travel control is made up of a increment type Coder and lead limit Switch. Cut the walking of the rifle to drive: Each walking which cut the rifle is to pull an 0.3kW electrical machinery to carry on by a SIEMENS MICROMASTER 440 type frequency converter, cut the position where the rifle walks by two increment type Coders separately and is close to on off control. The rise or fall system of the cut-off machine: It cuts rise or fall of car to be by one the intersection of pole change and speed-adjustable motor ' 285/1375rpm 0.28/2.3kW) Adopt the contact apparatus positive and negatively and transfer to the duplex winding and take a percentage to drive six times, travel control is composed of limit switches. 4 Profibus field bus 4.1 Total collinear definition and characteristic of scene Field bus, according to the definition of International Electrotechnical Commission IEC/SC65C, refer to installing between the on-the-spot devices in making or course area, and the data bus of digital, serial and multipoint communmication between on-the-spot device and inner automatic control device of control room. Based on field bus the whole numerical control system developed and called FCS. The field bus is regarded as and connected the two-way digital communication networks of one grade of devices and control equipment of scene in control system, its advantage is obvious compared with traditional DCS system: Have strengthened the integrated ability of on-the-spot information; Antijamming capability increases, system reliability improvement; Install conveniently, the maintainability is good; Have opening, interoperability, compatibility, can be integratedding; Have reduced the engineering cost; Have IP67 protection grades, can install live; Yes trouble location of automatic diagnosis. 4.2 Profibus bus line Profibus is a kind of internationalized, open, total line standard of scene not depending on the apparatus manufacturer. Extensively suitable for manufacturing industry's automizing. Other fields such as industrial automation of the procedure and the building, traffic electricity are automized. Central processing unit( Such as PLC/PC) Adopt at a high speed I2C and dispersible site plant ' Such as I/O, frequency converter, valve) Carry on the communication, most data interchange adopts the cycle way. PROFIBUS-DP is used for the high speed data transmission of the site plant grade, the communication medium adopts the shielded twisted-pairs copper cable, share a right wire, the communication speed can choose 9.6kbit- 12Mbit/s, the distance reachable 12km of communication. PROFIBUS total collinear traffic carrying capacity is strong, there can be traffic carrying capacity of 10 words at most with the communication of the frequency converter. 4.3 Data communication form of Profibus-DP Profibus-DP bus line way allowed in PLC and drive mechanism ' Frequency converter, movement control device) Between carry on fast data interchange. Always - carries on from the way the access of the drive mechanism according to the main fact, the drive mechanism is always the slave station, and there is a clear address in each slave station. Transmissive message structure of PROFIBUS periodicity. Fig. 3 Profibus-DP message structure
Step into industrial Ethernet of the on-the-spot controlled field
A foreword Used for office and commerce Ethernet accompany by field bus, fight the smoke of gunpowder fiercely, enter the controlled field silently traditionally, Ethernet moves towards the front desk especially in recent years, fast growing, quite noticeable. Trace it to its cause, mainly because industry's automated system is distributed melting, intelligent real-time control and developed forward, among them communicate and already become the key, user's requirements for are urgent day by day. On the other hand, technical development at full speed of information such as Intranet/Internet, requiring enterprises can realize the overall seamless information integration from on-the-spot control layer to administration and supervision authorities, and offer an open basic framework, but the present field bus still can't meet these requirements. Should say, total collinear appearance really brings a profound revolution to industrial automation at the scene, but many kinds of field buses are incompatible, can't realize high-speed real-time data transmission between the control devices of different companies, the information network has wide gap on agreements, cause " automatic detached island " The appearance of the phenomenon, impel people and begin to seek new outlet and concern and get to Ethernet. 2 Ethernet and industrial Ethernet 2.1 What is Ethernet and industrial Ethernet Ethernet is nowadays most general communication protocol standard that the existing LAN adopts. This standard has been defined in the LAN (LAN) Cable type sum signal processing method which China adopts. Ethernet conveys the information package at the rate of 10~100Mbps among interconnection apparatus, the type of the twisted pair cable is 10 Base T. Ethernet becomes and employs the most extensive Ethernet technology because of the speed of its low cost, high reliability and 10Mbps. Wireless Ethernet reachable 11Mbps of the direct extension, the products that a lot of manufacture suppliers offered can adopt the general software agreement to carry on communication, opening is good. Ordinary Ethernet is applied to the industrial control system, this kind of network is called industrial Ethernet. 2.2 Advantage that Ethernet has (1) Have quite high message transmission rates (already reached 100Mbps at present) ,Can offer the sufficient bandwidth; (2) Because of having identical communication protocols, Ethernet and TCP/IP are very apt to integrate to IT (information technology) World; (3) Can operate different Transport Protocols on the same bus line, thus can set up the public network platform or basic framework of enterprises; (4) In the whole network, have used interactive and open data access technique; (5) Have continued to use for many years, has already been known by numerous technicians and can offer extensive arrangement, maintenance and diagnostic tool on the market, become the de facto unified standard; (6) Allow to use different physical mediums and form different topological structure. 2.3 Advantage of industrial Ethernet (1) Ethernet based on TCP/IP adopts the international major standard, the agreement is open and improving different manufacturer apparatuses, it has interoperability that it is apt to interconnect; (2) Can realize the remote access, remote diagnostic; (3) It is made up that different transmission media can be flexible, like axle cable, paired line, optic fibre,etc.; (4) The network is fast, there is even more reachable giga; (5) Support the redundancy and connect the disposition, the reachability of the data is strong, the data have multiterm thorough fare that reach the destination place; (6) System easy and nearly unrestricted, will increase and appear predictable trouble because of system, by the ripe and reliable safe system of system; (7) Reducible cost of investment. 3 Ethernet enters possibility of the controlled field of industry The uncertainty existing as to Ethernet and not good enough problem of real-time performance, already use, initiative realization, leading-in and diplex to route etc. of priority of switching functionality of intelligent hub, have been basically solved. Through raising message transmission rate, the topological structure of the selection network and load dispatch of the constrained network carefully, can minimize the probability of conflict of the data. In addition, such as Hirschmann Company had already developed a series of ones that have strengthened, has been suitable for Ethernet device used for sealing and anti-vibration of the industrial environment, such as guide track style transceiver, line concentrator, switcher, bond-linkage element,etc.; Woodhead Connectivity Company introduces and protects the grade as RJ-45 interface unit of IP67, all these were given very much the network entered the real-time controlled field to create terms. Just because of this, ARC (Automation Research Company) Predict Ethernet and TCP/IP will become bus lines of device and always collinear basic agreement of scene in the future. VDC (Venture Development Corp.) Predict in the investigation report released on March 19, 1999, on the application of industrial control, the market share of world of Ethernet will jump 22% which became 2003 by 8.4% of 1998, it was maximum of increasing degree in various bus lines. Meanwhile, some international organizations have been engaged in promoting Ethernet to enter work of the controlled field in the world at present, electric such as IEEE (U.S.A. and electronic engineering SCTE) Setting about making the new-standard that field bus and Ethernet communicate. This standard will be enabled network to see " The target " . IAONO (the open network alliance of industrial automation) Reach common understanding on advancing Ethernet and TCP/IP with ODVA and IDA group together recently. ODVA (Devicenet supplies the CEMA consumer electronics manufacturer'sassociation) It is industrial standard of using Ethernet to serve to release one on March 17, 2000 in the basic unit of factory. FF (field bus foundation) Announced high-speed Ethernet (100Mb/s) on March 29, 2000 Final technical regulation (FSI1.0) . Industrial Ethernet association cooperates with units such as ARC, Advisory Group of U.S.A.,etc., launch the key technical research of industrial Ethernet. The development of 1000Mbps Ethernet has already entered practical stage at present, but its price is still relatively expensive. Knowing by the above-mentioned analysis, it is an inevitable development trend that can't be ignored that Ethernet enters the controlled field of industry. Current situation that 4 industrial Ethernet develops 4.1 Progress in the application layer (1) Capsulation As everyone knows, Ethernet only offers a series of physical medium to define with a framework shared. The framework includes the physical medium, frame format and machine format addressing form of LAN apparatus, namely it only offers physical layer and data link layer. But Ethernet, TCP/IP include IP agreement (the layer three) , TCP or UDP agreement (the layer four) ,When used in information technology in Ethernet, the seventh layer contains HTTP(super text Transport Protocol) , FTP (FTP) , SNMP (simple network management protocol) , SMTP (simple E-mail conveyance agreement) And Telnet (Telnet) When. But when it is used for industrial control, it is the real-time communication, application protocol used for target of the systematic configuration and project model that reflect on the seventh floor. Assemble and call these different concepts " Capsulate " (Encapsulation) . TCP/IP supports the interconnection among the heterogeneity networks based on operating system of heterogeneity, it is a genuine open system communication protocol, have already become the De Facto Standards of carrying on network interconnection of heterogeneity in the world at present. " capsulate " It is in the container imbedding the message frame to TCP or UDP. The typical example has HSE (high-speed Ethernet) that Ethernet/IP, FF that Rockwell Automation and ODVA develop develop , Modbus TCP/IP of Schneider Electric development. Data of all these agreements are before sending Ethernet to, the field bus message did not basically have change that combined as " subscriber data " It is in-frame to imbed to TCP/IP, very easy downward compatibility reaches the agreement based on the above-mentioned bus lines. Ethernet/IP that Rockwell Automation and ODVA put out, have employed CIP (Control and Information Protocol, control and information agreement) of the compressed ControlNet and Devicenet agreement ,CIP passes " Recessiveness " And " dominance " Information offers the service used for the wide-ranges of access data and control equipment. Must capsulate it before sending CIP data packet, CIP data packet gave a message heading (header) ,The content of this heading depends on the service attribute asked. Include one dedicated Ethernet heading, a IP heading, a TCP heading and one capsulate the heading through CIP data packet of the Ethernet connection. Capsulating the word separator included of the heading has control command, form, status information and synchronous data,etc., this can be allowed to convey and guarantee to decode in the take over party through TCP or UDP in CIP data. Schneider Electric was put out " The transparent factory " ,Its core is Ethernet and TCP/IP, seals the module equipped with Modbus TCP/IP of Modbus agreement to apply to Quantum PLC. Modbus TCP has already become the semiconductor industrial standard EMIE54.9-2000. HSE of FF is a high-efficient ground map to UDP (user's data message agreement, one is thought the Transport Protocol superior to TCP, short simple than the intersection of TCP and heading heading its, take 8 bytes only, and TCP the intersection of the length and convertible one byte) Each best for example,last Publisher/Subscriber agreement HSE,for IEC61158 field bus types 5 canonials international. Another solution is that the total collinear upper strata are operated or sealed and is equipped with TCP/IP on the scene. Interbus is this kind of solution, its Ethernet tactics are to split TCP/IP messages into several small-scale data packets and capsulate in the parameter passway of Interbus and transmit, its frame agreement of summation still maitains unchanged. These will be reassembled in the take over party to resume for the original TCP/IP message by data packet cut apart. The inefficiency that the shortcoming of capsulating the scheme is the agreement, the heading of Ethernet is much greater than the subscriber data, thus increase the expenses greatly, so it is only suitable for sending high-capacity data information capsulating the scheme.
Total line CC-Link is summarized at the open scene (Part Two)
Fourth, employ the characteristic to be brief introduction of Because site plant such as various flow indicators, electromagnetic valves, Temp.-controlling appearances of CC-Link all right direct connection, having reduced the cost of conductor arrangement, the change that and the convenient interstar connection is designed; Can keep the high-speed communication speed of 10M within 4.3 kilometers through the relay set, used in each on-the-spot controlled field such as semiconductor production line, automatic command line, food processing line and car production line extensively. In China of China, many places have used CC-Link too. Sum up its characteristic of application as follows now: a) It is easy to set up the cheap simple and easy control net Not merely can connect various on-the-spot instruments as CC-Link of the on-the-spot bus network, PLC stands as the Intelligent device station to and can also connect various local control. Under the situation not big of the traffic among each local key station, adopting CC-Link can form a simple and easy PLC control net, compared with genuine control net, the price is extremely low. For example the air conditioner of Qingdao Haier tests the production line. This produced collinear each work station of test adopted a set of independent PLC (FX2N PLC of Mitsubishi Electric) ,Test task of controlling the work station of this test comes. In order to make managerial personnel find out about the working condition of every work station of production line in time, so adopt CC-Link to connect and become a network each independent key station, adopt with the main website ' A1SJHCPU of Mitsubishi Electric) The ones that connected came to location machine and controlled and tested the collinear working condition entirely. Compared with traditional RS485 communication way, CC-Link communication from long, fast not merely, have competitive edge at prices, and because CC-Link has offered the strong RAS function, so can control the working condition of each on-the-spot testing station on the upper computer, find various unusual, unusually,etc. line of the network in time. Stand and go wrong a certain piece PLC on in it is at testing stations on-the-spot,will circuit breaks automatic, and does not influence the other work that stand, after this station is repaired, will reach the standard grade automatically. b) It is easy to set up the cheap redundant network Put forward very high requirement to the reliability of the system in some fields, often need to set up main website and spare main website and forming the redundant system at this moment. Though CC-Link is a network of grade of a scene, offer function that graded nets has to a lot of Senior One, for instance: Can presume main website and spare main website to it, because its fabrication cost is cheap, the sexual valence is higher. For example in the heat and power plant project of Yinchuan, have adopted this function of CC-Link. Main website, spare main website adopt Q2ASHCPU of Mitsubishi Electric, connect two long-range input stations through CC-Link and export the station long-rangely. Normal working hour, is controlled the remote station by the main website in the main website, off premise station; When breaking down at the main website, automatic the intersection of take over and control power of system spare main website, work as the main website, has prevented the systematic stagnation. c) It is scattered to suitable for some control points, install the range at the narrow scene. In the monitor system of the building, such as the gas burning monitor system, its corresponding check point is numerous, and more scattered. In addition, what the skyscraper is designed in order to pursue is economy, often try hard to narrow the size of intermediate layer and upper and lower passways. Adopt CC-Link on-the-spot network to connect discrete long-range I/O module, a Layer network can be controlled at most 2048 o'clock of 64 places, it can reach 7.6 kilometers to always lengthen the distance. The volume of the miniature I/O module is only 87.3x50x40mm, enough to install in the extremely narrow space. Send one angstrom of on-the-spot network news report ways to adopt CC-Link of observing and controlling department of industrial corporation in the west of Shanghai, have succeeded in developing" the bus type gas leakage of FLD scene controls the system " with the first half of 1998 And already its commercialization, this product succeeded in applying to projects such as Shanghai Pudong International Airport,etc.. d) Suitable for various site plant of direct connection. Because CC-Link is an on-the-spot bus network, so various site plant of its all right direct connection. For example in the project of the large theater of Hebei, have used numerous frequency converters. The originally commonly used method to connect frequency converter is controlling through outputting joint, analog quantity or RS485 communication,etc.. For example adopt analog quantity, direct against a frequency converter, correspond to it in a passway where PLC needs a analog quantity module, if adopt a piece of module 8 passways of D/A conversion modules, connect 40 frequency converters to need 5 pieces of such module, and if adopt the square man-machine interface of connection of CC-Link to presume as station 2. Adopt the communication speed of 5Mbps. Notice the speeds of all apparatuses must be unanimous, otherwise L.ERR (communication makes mistakes) The lantern fair is lighted. Fig. 4-2 join graph of hardware 2. Software respect needs to carry on the following arrangement: I. To CC-Link configuration. Through writing the initialization routine, or is set to finish in the parameter setting picture. (The latter support products with the high edition. ) II. Write the corresponding communication procedure. Prove on the configuration first below. Before CC-Link runs, needed to presume several head-to-tail substations at the main website, each station is some apparatuses,etc.. Then write the initialization routine; If adopt the parameter setting picture. Fig. 4-3 Fig. 4-4 The communication procedure mainly writes the data interchange of the frequency converter with required communication. The man-machine interface is connected with CC-Link, there are two kinds of its communication way. A is in order to circulate communication way, need to carry on simple programming to the communication content on PLC side. Another kind is a communication way of the instant, only need to appoint the required soft component that controls on the side of man-machine interface directly, but required communication time is slightly longer. So can not require high information to some in real time and adopt the instant transmission mode to presume briefly. The man-machine interface has mainly adopted instantaneous transmission in this system, in the settlement picture of the soft component, in " network " Select, appoint, need soft component that control which size of network which size stand in directly, here appoint HMI want control 1 No. it stands to be the main website 0 in network. Presume specifically that sees the following picture 4-5. Fig. 4-5 HMI presumes As to the resources X20/X21 within the above-mentioned PLC D100/D103/D201,etc., carries on corresponding settlement on the man-machine interface according to this method. (2) When the group of running water in Shenzhen is making automatic limited company of the source of day to the automatic engineering of pump house of mountains and rivers factory of Shenzhen pen carriage, consider already the part has realized the workshop PLC control in the former factory when the process is analyzed, compared, through price and perfomance analysis, relatively confirm: Choose the total line CC-LINK field bus products of open scene as the top management apparatus, control the systematic structure chart of the hardware. Pen carriage pump house of mountains and rivers factory controls the structure chart of the system hardware in Fig. 4-6
