Summary: Article introduction is new-style can make up Cheng controller PCC (Programming Computer Controller) means of processing of structural model, much task and process designing characteristic, in the meantime, automatic alignment cuts off the high speed that still introduced yard officer to be developed jointly machine hydraulic pressure and electrical system, and PCC cuts off the application on machine in high speed alignment. Keyword: PCC; Much task; Class of high speed task; Alignment of preface of average assignment class is cut off machine it is the device that is used at cutting off alignment of reinforcing steel bar set length. Its alignment speed is original equipment only 30m/min, as the ceaseless development that builds an industry, cut off the manufacturing efficiency of machine and automation degree to raise taller and taller requirement to alignment. Automatic alignment cuts off the high speed that swings a general machinery plant to be developed jointly by Shanghai traffic university and stannic hill city machine its alignment speed can amount to 120m/min, manufacturing efficiency and automation rate rise greatly. As alignment speed rise, to controlling device detect, the real time sex of control, data processing also raised taller requirement. PLC works with its reliable (MTBF is 100 thousand hours of above) apply to harsh working environment and received wide application. But traditional PLC is only job model, module of mishandle much task. PCC (Programming Computer Controller) it is a kind of when in recent years development rises new-style PLC, it has much task to handle ability, agree with control function is complex, right the circumstance with high demand of real time sex. The PLC of tradition of principle of much task processing of 1 PCC is only job model, applied program is only to the system one. The systematic software correspondence of PLC uses a program to be carried out repeatedly, the time that every execute calls scanning cycle, the scanning cycle of PLC is in more 1 ～ 5ms, this time enough can identify external pushbutton, switch input and make answer, this kind input-output defer can be accepted by place of circumstance of most switch control. However, in taller to requirement of real time sex circumstance, means of only job control appears not quite agile insufficient even. If the structural model of the PCC that has much task to handle ability pursues 1 is shown, operating system kernel is the standard operating system that has much task capacity, basically apply a program to provide resource management for much task. The intermediate layer of the model is PCC software package, it goes up to apply a program to undertake administrative to systematic task, much task in the foundation of operating system kernel. Systematic government module and systematic task module manage systematic job, so-called system task is to point to the process of the operating system. Module of high speed task and the applied program that average assignment module runs level of high speed task and average assignment level respectively. System of PCC software package allows user task (relatively independent applied process module) set is level of high speed task (HS-Task Class) with average assignment class (Task Class) . Class of high speed task and average assignment class can divide accordingly again to be as follows in all 8 tasks class: Task Class4 of ～ of HS-Task Class4 of HS-Task Class1 ～ , Task Class1. The first step that its implement is ordinal and degressive, every task level but set its cycle time. For example, if the periodic time of HS-Task Class2 is 50 μ S, criterion S of every 50 μ implements the system the task module of this level. Model of graph 1PCC structure if the graph is shown 2 times,with Task Class1 and Task Class2 two tasks level is the executive circumstance of the exemple. The processing of much task is to execute the mission with high level first actually, if pursue 2 medium Task Class1, its are actual run time is 4ms, after Task Class1 is carried out, carry out Task Class2 again, because the run time of Task Class2 is 9ms, beginning to carry out Ask Class1 to arrive to be carried out the next time (namely periodic 10ms) when, task Class2 has not moved, because the preferential level of Task Class1 is high, so the execution of Task Class2 is interrupted, and turn go carrying out Task Class1, wait after carrying out Task Class1, turn again go carrying out Task Class2. Graph 2 in ① is denotive it is operating system clock, graph 2 in ② is denotive it is systematic government what need time. Systematic government time is used at the management to systematic task, this time is unalterable, carry out for cycle with the operating system clock of 10ms. Graph 2 much tasks execute sequential application order the set principle of level of each task module is: Below the condition that asks in sex of contented real time, answer to reduce its level as far as possible, in order to avoid CPU overload. The each task module that uses a program spends to the load of CPU press type calculates in type: λ -- this task is spent to the load of CPU; Ti -- the actual run time of this task (Ms) , can determine by Profiler software; TT -- this task is located the cycle of level (Ms) . Move to make sure CPU is reliable, the λ of each task should not exceed 80% . In addition, to increase the processing capacity of real time much task, PCC uses double CPU structure on hardware, one is in charge of be being inputted with other / the communication that outputs module, another CPU is used technically at handling user order. 2 PCC cuts off the application on machine in automatic alignment (1) principle of system of hydraulic pressure of hydraulic pressure system is shown 3 times like the graph. In the graph 1, 2 for double couplet hydraulic pump. When cutting off crock of 9 be issued to lower levels, electro-magnet 8 cut off the power, pump of high-pressured little flow 1 with pump of low-pressure large flow 2 offer oil to cutting off a crock at the same time, make its fast be issued to lower levels. Laden pressure is elevatory when cutting off reinforcing steel bar, one-way a powerful person 6 close, only by pump of high-pressured little flow 1 offer oil. After cutting off, pump 2 cut a crock to offer oil to follow, make follow cut a crock 10 follow quickly cut reach return. A powerful person 4 when be being used at the system is short not to work, carry on his shoulder or back to discharge of large flow pump. Because follow to cut and fall,expect run undertake at the same time almost, two crocks of place when high speed is cut off need flow all bigger, reason this, fall makings crock 12 use hydraulic pump 3 independence offer oil, mix in order to prevent the flow of pump greatly too the mutual interference of system of two hydraulic pressure. Throttle 14 use at adjusting to fall makings crock the working rate of 12. Graph principle of system of 3 hydraulic pressure pursues 1, 2, 3. Electric machinery 4.
Contactor system 5.
SMC6, 13.
Protector 7.
Keep apart transformer 8, 9.
Switch power source 10.
Solid state relay group 11.
Electro-magnet group 12.
Contactor controls coil group 15.
CPU module 16.
DI13517.
DI43918.
DO43519.
DO72014.
The hand uses pushbutton form 20.
Photoelectricity converter pursues principle of 4 electrical system pursues (2) PCC and electrical system graph 3 in electric machinery 1 use at driving alignment roller to be opposite alignment of reinforcing steel bar, electric machinery 2 be cut off and follow the drive electric machinery that cuts hydraulic pressure system, 3 it is to fall the drive electric machinery of system of makings hydraulic pressure. Auxiliary relay group is used at the segregation between the output module of PCC and electro-magnet of hydraulic pressure a powerful person and signal enlarge, contactor group is used at electric machinery soft start, stop to reach speed changeover. As a result of 1, the power of two 2 electric machinery is greater, start the to electrified wire netting concussion in the process to reduce electric machinery, use SMC of electric machinery soft starter to undertake to electric machinery soft start. If the graph is shown 2 times,the module of PCC is configured. CP774 is CPU module, also be the core module of PCC. DI135 is module of high speed computation. Alignment roller is in alignment reinforcing steel bar while, drive photoelectricity position sensor, the converter of signal classics photoelectricity of positional sensor magnifies plastic evacuation enters DI135 module, to be being made detect by length of school reinforcing steel bar. DO435 is dc output module, its output contact to control auxiliary relay, auxiliary relay outputs contact to dominate the action of electromagnetism a powerful person. DO720 is communication output module, its output contact to control the control line that communicates contactor to encircle, realize pair of 3 stage electric machinery through communicating contactor open the high low speed that stops control and alignment electric machinery to control. DI439 is input module, the hand moves what pushbutton basically uses at the system to debug. PanelWare is the interactive equipment with PCC form a complete set, pass interactive information of RS232 communication cable and PCC. The face plate that passes PanelWare bolts and display screen but set is machined the norms of reinforcing steel bar, cut off length, cut off a number to wait. The interactive program of PanelWare is developed on the development platform of PanelWare Studio, parameter of set of the design that basically is man-machine interface, input, set is read take the function such as control key. The process designing of PCC uses Pg2000 language, pg2000 language is the programming language of language of a kind of similar C, it combined the advantage with C language and Pascal both language. The major syntactic regulation of C language applies to Pg2000 language. Because the systematic software of PCC supports much task processing, the control function that implementation answers by technological process in this design differentiates whole control process 14 tasks module (program module) , among them basically parameter is read take cut module, automatically follow module, automatically cut fall module, automatically to jockey makings module, automatically module, speed control module, successive cut control module to wait. What these 14 module ask according to real time sex is different, differentiate again for 3 tasks level. Because cut module automatically outside the movement besides control cutting tool, still be in charge of receiving tally computation to be worth, its the setting is the task module with task top level, its carry out cycle the shortest, dominate computation error the action of a powerful person of minimal seasonable control thereby. And read taking parameter module is to read the treatment parameter set that takes operation personnel input to be worth, inferior to requirement of real time sex, can be its set module of elementary and other job, increase executive cycle, in order to ease the pressure to CPU. The PCC that 3 last words have much task to handle a function is the new generation PLC that in recent years development rises, it applies to miniature control not only, can be competent more complex tall to requirement of real time sex control circumstance, and its trend is a system but expansibility and the help to spot bus line and network also are increasing ceaselessly, expand as dimensions ceaselessly, much task handles ability more and more show vitality. Use PCC pilot automatic alignment is cut off machine its alignment rate rose 4 times original, outside rising substantially except manufacturing efficiency, sex of its function, easy operation also has bigger improvement. CNC Milling