The numerical control system mainly is two major part is composed by the hardware and software. The systems control software coordination hardware reasonable organization, the management data system input, the data processing, insert makes up and outputs the information and the control executive component, causes the numerical control oing machine according to operator's request, the realization volume system.

1 numerical control system hardware design

This system uses the level CNC system thinking, namely PC labor controlling machine CPU took the core superintendent, completes to the first floor equipment management and the macrocontrol. But oing machine position control PLC controls by PMAC Programmable Multiple-Axes Controller special-purpose CPU controls. According to the above hardware principle of design, unifies the oing machine numerical control system the characteristic, proposed one kind take the PMAC movement controller as the control core, labor controlling machine for the system strut unit double CPU open style numerical control system. Designs its control system hardware architecture like chart 1 to show.

The hardware design has applied the PC hardware technology. The overall system foundation is the Pentium III 400 industries controls machine, uses labor controlling machine CPU to take the system the main processor, completes the system the management, the man-machine alternately dynamic demonstration, the pretreatment, the reference computation and picture processing. Uses the standard main line technology (the ISA main line), the effective solution because the main line different has brought the hardware cannot the public question.

Has the formidable man-machine alternately to operate the function. The engine bed operator may need the information through the floppy disk in the I/O equipment input processing, when also may the edition function which provides through the system, the input processing information system movement, on the monitor picture and the data reflect each position transducer feedback the processing information. May carry on the control through the keyboard 'or' operation kneading board. Horizontally moves and so on the position examination sensor uses magnetism grid R, its precision is 0.05mm. The main axle position examination sensor for revolves the encoder, 1,048. Through the position transducer feedback achieved half closed-loop control, guarantees the engine bed the pointing accuracy and the movement precision. Formidable open style modulation hardware architecture. CNC system including below module: Movement control module, PLC module, basic input output module, communication module. The movement control module is independently completes the movement function the module, is the hardware and the software aggregate, the control goal is the speed position and the torque. PMAC is the function formidable movement controller, is playing the key role in the system, is an extremely important module.

PMAC brings high speed CPU, is has the independent memory, the independent operation operation ability computer, may accept the PC main engine the order to carry on the work, also may the off-line movement independent work. The system has developed the PMAC movement controller following function: 1, realizes the position and the velocity feedback with the increase type A/B orthogonal encoder, also may connect some suitable appendix realization feedbacks. 2, the formidable computation function which board has using PMAC the movement controller DSP, to the variable, the constant carries on the arithmetic, logical as well as the surmounting operation operation, the computation detention and the communication detention which then avoided the main engine when having carried on these operations creates. 3, uses PMAC the multiple spindle movement procedure management function. The PMAC movement controller memory may save reaches 256 movements procedures much. The movement control language carries out which in the PMAC movement control has BASIC or C and so on the high-quality machine language characteristic, simultaneously it is compatible with the G code engine bed, and may directly accept the G code order. The computation structure and the logical organization and the machine language are similar, and in the movement standard and the machine tool industry uses similar. 4, backstage PLC function. When movement procedure has the foreword movement when the onstage, the PMAC movement controller may reach 32 different PLC function in the backstage movement. Simultaneously PMAC has provided the non- special-purpose digital input and the outlet. Using these I/O mouth, the procedure may complete PLC the function PLC procedure and the movement procedure sharing identical logical organization, but cannot control 运动�?

PMAC connection design. The oing machine numerical control system functional element certainly is not the servo electrical machinery, its position control is and revolves the encoder through the magnetism grid to realize the position feedback, used the MACHI mouth to connect 4 groups of sensors, used for to examine the position to realize in the position control oing machine control system all conditions examination and all primary devices control all is by the PMAC input, outputs its principle like chart which the control panel controlled 2 to show.

Uses double port RAM (DPRAM) to take between the main engine and PMAC the communication bridge. DPRAM is PMAC prepares chooses between, primarily machine and PMAC may share high speed memory area. Using DPRAM, between PMAC and the main engine may realize the high speed repetition does not need "shakes hand" the data communication, real-time conveniently carries on the data exchange. For example, the main engine may the position, speed information real-time AM transmit PMAC, carries on the position control by PMAC; At the same time, the main engine also may read takes PMAC to deposit in DPRAM the engine bed condition information.

This numerical control system uses the computer main line and PMAC carries on the communication, realizes the main engine real-time severance, then effectively enhanced the communication efficiency and the communication speed. When PMAC produces the terminal signal appears when the main engine main line, the main engine starts to calculate the new control data and to read in the data in DPRAM, PMAC the readout carries on the control from DPRAM to the electrical machinery; Simultaneously the main engine reads out the feedback data from DPRAM, carries on processing, completes function and so on real time display engine bed position engine bed condition monitoring.

2 numerical controls systems software design

In order to maintain develops the system technical 先进�? simultaneously enable the system to have the certain merit to prefer the extension, the project to choose the open style numerical control system design thought and the method. Its system overall plan like chart 3 shows.

The system design and the development has used the object-oriented method because this method has simulated the human cognition objective world process; Has the seal, the integration, as well as the news actuation and so on a series of characteristics, cause the transformation clearly the system module, the assembly maintenance convenient, may the expansion be possible the reorganization to be strong; The object-oriented model the conceptual model, the logical model and the physical model unifies together, enormous reduced the system understanding difficulty.

Uses the PMAC programmable multiple spindle controller, because its development contact surface is extremely friendly. It provides the PWIN programming tool completely in the Windows environment, the movement edition revises extremely easily.

Obeys the object-oriented system design and the analysis guiding ideology, the system design certain objects module organic combination. On macroscopic looked the system divides into the systematic level, the application level and the physical level three stratification planes, like chart 4 shows. Mainly solves IPC and PMAC, a series of technical question which FlyVideo inherits, because PMAC has own CPU and RAM also has EPROM; FlyVido also has own RAM and the corresponding logic unit, but PMAC and FlyVideo all are is connected by the main line way and IPC, IPC must integrates these resources and own resources forms together the integrity the control system, must have the effective integrated method. Is the system main body are partial using the level, is composed by certain functions module. In under the systematic level support, various functions module independently completes part of tasks, thus realization system all controls goal. The physical level is a mechanism which corresponds with the physical space, is composed by certain and the memory file organization correspondence construction of data, uses for to satisfy the man-machine alternately with the visit database demand.

In under the software design process also must realize these specifications:

(1) on position machine and lower position machine real-time communication: On the position machine and the lower position machine real-time communication is Corporation provides and PMAC using DELTA TAU DATASYSTEM a necessary PtalkDT kind of realization. The PtalkDT kind through increases ActiveX the way to perform the example, and () the method completes the bidirectional communication by GetResponse. On the position machine and the lower position machine communication speed is decided by the main computer basic frequency, the PMAC CPU speed, as well as system program and lower position machine control procedure size.

(2) the video frequency demonstrated that, Video signal processing and the image display control is through to the video frequency card two developments realization. The FlyVideo video frequency card provided the OCX standard to control Capwnd and the application system carries on the integration. Should control a 16 main method and 7 attributes by MFC42.DLL and the MSVCRT.DLL two dynamic connections storehouses support, with the aid of these two dynamic connections storehouse support, the system has developed Overlay and the Peview two kind of image displays pattern, facilitates the scene the different request.

(3) voltage-stabilized source: Large-scale volume board equipment working conditions bad, the electrical network voltage extremely is in particular unstable, is very easy to attack the numerical control system, creates dying machine. Its result is light then the product becomes invalid, the heavy piece of damage equipment, loses estimates with difficulty. For prevent the numerical control system had the control fault because of the power source disturbance, the system specially disposes the speed of response to be smaller than the 0.1ms on-line uninterrupted voltage-stabilized source. In addition, the system has also carried on essential processing in the software design, has established the filter procedure for each movement.

(4) controls the clock: The systems control clock mainly is from the guarantee system normal operation angle, the cyclical scanning lower position machine I/O mouth, the video signal condition, as well as interrupt request information, in realization position machine and lower position machine real-time communication; Gain coordinate of motion current value; Dynamic management database; On-line decision-making procedure advancement and so on. This module controls the Timer realization by the standard. In order to enhance the reliability, the system uses the single clock to actuate the clock, scanning cycle 80ms.

3 conclusions

After the production practice examination, on 17000kNx3000mm roller multi-purpose oing machine numerical control system software and the hardware design completely conforms to the production. In the production process, the systems control software coordination hardware smoothly carries on the data feeds, the data processing, the information output as well as to the executive component control, causes the numerical control oing machine according to the design request, safely reliably moves the automatic volume system technological process.