News report of network of machine tool of economy numerical control and control technology study

The economy of problem 　 tradition that machine tool of 1 traditional economy numerical control exists CNC Machining equipment presses classification of numerical control system to basically have: FANUC system (include 3T, 7M, HC-6, 6MB to wait among them) , system of AB company system, cut of homebred 3B line: Input by numerical control program / cent of type of interface of output news report has 3 kinds: One kind is only RS232/RS422 serial mouth, 2 kinds run paralell for unit of 8/5 of reader of only punched tape mouth, before 3 kinds include at the same time two kinds of interface. These 3 kinds of machine tools still put in same question at the same time is: Memory capacity is lesser, the treatment of part of incommensurate complex, large area, high accuracy, long process: Their external interface ability is poor, without DNC function, cannot realize online treatment and network control to wait for a problem. 1.

The solution 　 of 2 hopes is acted on satisfy the most fundamental application demand, and stay it is certain to have but expanding the premise that reachs the latent capacity that function increases, will improve CNC Machining technology to apply an environment. Offerred the following solution at this point: The hardware of interface of machine tool communication is transformed, in the light of the communication with corresponding design of of all kinds machine tool interface board gets stuck: Communication controls the development of software, in order to realize the stand-alone communication function of each machine tool: Development other assists a function (be like: The) such as the online treatment of imitate of graph of program of the extraction that information processes in numerical control program, numerical control, long process, make up for and enhance function of system of former numerical control: The definition of the choice of network system and communication agreement and network system control the development of software, the central server that implements numerical control program centers management and network news report. 2, 　 of 　 of construction of system 2.

1 network system is formed reaching system of functional 　 whole network is by converter of interface of central server, network, two-way data, field service implement, mouth of 1 minute of N is collateral data is sent and receive implement, the composition such as machine tool of data receiver and economy numerical control. Central server is the center part of whole network, what it basically finishs is the integral control of pair of various servers. The Taichun after it is used breaks working pattern, do not need the person's interpose, and its still can have other job downstage. Field service implement it is client end, hold the position of the function that has numerical control server already, have function of powerful network news report again, it accepts each job of central server make known to lower levels: Get the data information of the CNC Machining program that transmits by central server from the network, convey these data information to NC file library: the numerical control order that already had processed feedback reachs in the center of server. Can extract corresponding numerical control code from inside NC file library of the system, collect concerned treatment hardware data and information from which, undertake handling to its, realize the job such as the graphical imitate of NC program. Additional, grow the spare parts treatment of the program to needing to use, field service implement the online treatment job that still completes long program. Field service implement can serve at the same time at equipment of much stage numerical control, it is according to need inside the dimensional limits with certain workshop (for instance: A small workshop, a small local district) setting network node, place a PC to serve as field service implement, a server chooses mouth of 1 minute of N according to needing actually to lean collateral data is sent and receive implement will serve at equipment of much stage numerical control. 2.

All sorts of in selecting 　 system informations of architecture of 2 systems network and communication agreement are transmitted through the network. On computer network development, affect older network system to basically have: Model of OSI7 layer reference and TCP/IP architecture model. OSI consults the model is ISO7498 international standard. TCP/IP architecture is the architecture that the Internet network place of current popularity uses, although it is not international standard, but have very important place however in computer network architecture. Because,this is although the architecture of OSI from theoretic tell more complete, its each agreement also considers very comprehensive, but in fact, accord with OSI completely the business of each agreement seldom enters the market however with the product, cannot satisfy the requirement of all sorts of users far. The product that uses TCP/IP agreement however swarms into the market in great quantities however, almost all workstation deserve to have TCP/IP agreement, already made computer network in fact standard, appellative " industrial standard " . For this, we are in the system of network news report of numerical control machine tool, those who use is the network architecture of TCP/IP, this system is computer network cent 4, apply layer, transmission layer, network layer and network interface layer namely. TCP/IP architecture made two kinds of agreements to transmit a layer namely: Transmission control agreement (TCP) and agreement of user data bag (UDP) , UDP offers a process not to have connective datagram agreement for the user, data bag conveys with the form of substantive package, the service is not offerred assure without the fault, data may be missing, repeat or lose order: The length that data includes also accepts the restriction that handles the biggest length (acquiescent value is 8192 byte, maximum is 32768 byte) , the fractionation that does not have a package and recombine an operation: And of the word reduce expenditure that TCP agreement is a reliable full duplex operation face connective agreement, more reliable than transmitting, data does not have TCP and UDP photograph accident, without repeat, can press send order to receive, data flows for byte, its length is unlimited, provide empty circuit service for the user, offer to be transmitted of data reliably examine. According to the characteristic of CNC Machining, dependability of the UDP when although data bag is in,transmission quantity is less than 2048 byte is better, but data bag service is single bag, convey without foreword, and network communication of the system is apparent the information that all unwarrantable transmission is less than 2048 byte, accordingly, can choose TCP to regard transmission layer of the system as the agreement only. The characteristic that the choice of the communication agreement that uses a layer wants to consider CNC Machining already should have real time sex, dependability and data to transmit a quantity to wait for a characteristic greatly again. This system was developed separately be based on TCP/IP the corresponding agreement of consultative a group of things with common features, made the special meaning that uses the information that transmits between the process. 2.

The agreement of implementation 　 system of 3 communication agreement, between the applied line Cheng that assures client end and server end namely can mutual accurate, seasonable, orderly ground is deferent information, and can each other are without accident ground to have parse and explanation to information. Control a system to the network, its transmit information to have its distinctive meaning. In client end and the information that pass between central server, the request news that basically has client end, data information and the condition message that central server carries. The control message that the client carries divides again it is two kinds: The network dominates information and treatment control news: The condition message that the server carries also divides it is two kinds: Join state information and the condition message that the client carries. In systematic agreement, these information stipulated corresponding format is normative, the network control message that the client carries basically is used at be being built with server connective, maintain and release. Treatment controls information to be commanded by control parameter of word, control is comprised. Format of agreement of network news report is: "Cmd, 1byte commands code, 1byte commands length, command parameter, the desired result of 4 byte is piled up (XC) " . ' Cmd ' pile up for command guiding, jussive of label of in order to begins: ' command length ' the length that includes to command parameter and desired result are piled up only. If do not have command parameter, it is 4, desired result code will be insignificant also be not examined, but still must send. 4 byte are the fine that transmission data includes desired result code. Of all byte that before 3 byte wrap for this and, the 4th byte is the different of all byte or value. If send the know exactly about sth in the process to occupy,produce a mistake, criterion the scarcely of desired result code of the 4th byte is correct. Accordingly, rely on to monitor code of desired result of the 4th byte to assure the dependability of communication data. 3, system of 　 of hardware design principle uses card of interface of 2/4/8 mouth RS422A to undertake turning receiving in server end, converter of RS-422/RS-485 two-way data is used to turn after entering the spot receive to field service implement. Two-way converter of card of interface of 2/4/8 mouth RS422A and RS-422/RS-485 all uses industry to control standard interface board card. When field service implement service at machine tool of much stage numerical control, use " collateral data sends and receive mouth of 1 minute of N implement " cent is received at much stage machine tool. "Data receiver " it is to be aimed at unit of 8/5 of reader of only punched tape technically the machine tool of collateral mouth (machine of the cut that be like a line) and of the design. It completes the communication of machine tool and PC and the online treatment that implement numerical control program. When service data receiver, want to alter accordingly on machine tool wiring, namely: Merge into through 3 condition door on the output line in base paper tape reader signal of corresponding 3B code data, the time signal that the pace that dispatchs primary system punched tape reader regards control system as to keep data into signal. When the system is designed, installed control switch, use at choosing to use base paper tape reader or service data receiver. 4, the software of system of 　 of software development principle is comprised by two parts, it is the control software of network control system, another it is field service implement the communication software with of all kinds machine tool. The control software of the system of control of network of development principle 　 that the network controls a system to control software is installed in central server, its design a principle is: The data such as the request that central server keeps receiving and the analysis delivers from each port, command, information is wrapped. When a data the bag is received after ending, it will pass packet of medium desired result code to undertake test and verify should be wrapped above all whether to make mistake in deferent process. If make mistake, it will give out " heavy hair " the command gives former hair client end: If undertake corresponding processing correctly. Field service implement with the communication software of of all kinds machine tool development principle 　 is aimed at of all kinds machine tool and field service implement communication, the fundamental that software develops is: Want to pass into numerical control program numerical control machine tool, it is changeover of numerical control program code of EIA of code of machine tool level-headed or ISO code above all, the kind that includes with data next reads in field service implement memory, ground of again literal section controls a system to send to numerical control machine tool, at the same time the computer keeps monitoring the condition of the condition register of machine tool interface. Come out from the machine tool data, communication control software always begins the top to groovy memory from the extreme of its program code (0A0000H) serves as the buffer that receives data. 5, conclusion 　 this thrash out the network news report of machine tool of economy numerical control and control technology issue, the central server that implemented CNC Machining program focuses memory, management, network inquiry reachs download function. The numerical control program that settled the numerical control machine tool that does not have function of direct communication interface inputs difficult problem and online treatment problem. Carry out a proof: This system has an operation simple, use convenient, moving stability reliable, performance is good wait for a characteristic. Its investment is used, the memory that improved CNC Machining process greatly, management and transmission condition, improved actual production efficiency effectively thereby. To similar, do not have long-range monitoring and on of the numerical control machine tool of line ability transform, have principal port and reference to draw lessons from value. CNC Milling CNC Machining