PCC reachs his to cut off the application in machine in automatic alignment

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; Average assignment class

Introductive

Alignment 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.

1The much task of PCC handles a principle

Traditional PLC is only job model, applied program is only to the system. 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.
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