Standard of code of numerical control program (ISO EIA)

  • Time:
  • Click:131
  • source:BAGANZ CNC Machining
To satisfy a design, make, maintenance and all-pervading need, inputting system of code, coordinate, machine the respect such as instruction, auxiliary function and block format, two kinds of current levels had been formed on international, namely international Organization for Standardization (1SO) standard and American electron industry learn (EIA) standard. Ministry of our country mechanical industry made JB3050 according to ISO standard, 82 " digital control machine tool uses character of 7 units encode " , JB3051, 82 " of coordinate of digital control machine tool and athletic way name " , JB3208, 83 " perforation of digital control machine tool takes block. But because each numerical control machine tools produce the level that manufacturer place uses,have not unite completely, the code that its use, instruction and its meaning are not identical, the regulation in because this is when work out program,must using manual of process designing of numerical control machine tool by place undertakes. Punched tape also makes tape of punched tape, instruction, it is the control medium with numerical control commonly used device. Formulary code must be used on punched tape, arrange with formulary format, represent formulary news. After numerical control device reads in these information, undertake handling to it, use machine tool of command numerical control to finish particular mechanical movement. Current, numerical control machine tool uses 8 units punched tape more, of punched tape every can wear nine aperture all right, among them an alveolus is called " in feed hole " or " synchronous aperture " , use generation to read the synchro control signal of the belt. 8 aperture call the remainder " information aperture " , use the information such as record number, letter or symbol. Code is the language that numerical control system passes information, the letter that gives out in program sheet, number or symbol wear a Kong Lai by the regulation (namely information aperture) . Aperture represents a binary system " 1 " , represent a binary system without aperture " O " . Have according to an aperture, those who do not have condition is different, can get different information. We call this one hole code or character. Current, the commonly used code in numerical control system has ISO code and EIA code. ISO code is by 7 binary systems number mixes occasionally desired result composition, the Kong Shu that its characteristic is on punched tape each aperture must be even number, friend also call ISO code even code. Code aperture has certain regularity, if all numbers need to mix the 6th to go up in the 5th,punch, the letter needs to punch in the 7th, the 8th label occasionally desired result, it is when the Kong Shu of a certain code odd when, wear an aperture with respect to the 8th when go in this code, make a total of aperture even, if the Kong Shu of a certain code already was even number, criterion the 8th is absent filling aperture. The characteristic of EIA code is outside dividing CR, other each character all does not take up the 8th, next the Kong Shu of each its aperture is odd, friend also call EIA code odd code, its the 5th aperture is Bu Jikong. Word of example exactly the number 5 answer to there is opening with the 3rd in the first by the binary system, but Kong Shu is even number, reason is in the 5th to go up fill an aperture makes Kong Shu is odd. Fill occasionally with fill strange purpose is for numerical control machine tool examine when reading in a program whether does punched tape have little bore a hole, defeat the phenomenon of aperture, if have a problem, control system can call the police, command stop machine. Because fill occasionally, fill strange kind is to regard as examine punched tape uses, it is not the component of code, the belt of 8 units aperture that friend says normally is called again " character of 7 units encode " . Numerical control program is formed by a series of character and number. In interior of numerical control system every character or number have corresponding fixed code. There basically is level of two kinds of codes on GB at present: ISO (international Organization for Standardization) standard and EIA (association of American electron industry) standard. ISO code and EIA code photograph are like next advantages quite: (1) : ISO code is code of 7 binary systems, EIA code is code of 6 binary systems (do not include odd even desired result) , ISO code is consequently one times bigger than EIA code. (2) : The encode regularity of code of ISO code EIA is strong, allow legibility. (3) : ISO code is even code, the 8th to fill occasionally. And EIA code is odd code, the 5th surprises to fill. Our country is in this respect is basically trashy ISO standard, also formulate corresponding numerical control standard, " numerical control machine tool uses character of 7 units encode " standard (JB3050-82) . Must notice: At present domestic and international the level that place of all sorts of numerical control machine tool use had be notted unite completely, concerned instruction code and its meaning are endless identical, process designing current affairs abides by the regulation in operation instruction handbook of particular machine tool strictly surely. CNC Milling