一种实用分布式两级控制系统

本文提出了一种由AppleⅡ机和Z80机组成的多,微机系统(MMCS)。该系统采用共享存贮器方式交换信息,通过制定通讯协议,使MMCS不仅能传送数据块和程序块,而且具有吞吐率高、模块性好、结构简单灵活等特点。

A Practical Two-grade Control System of Distributed Type

The structure of multimicrocomputer system (MMCS) with an Apple II computer and two Z80 single-board computers as well as its application in the automatic dynamic balancing of crankshafts is described. MMCS adopts the shared memory communication, in which the interface circuit among the computers is divided into five parts according to their functions: common memory, executing unit, synchronizing unit, and common memory arbitration unit. The software system of MMCS is of blocked structure, in which there are three storeys and all of the programs can only be called by programs in a higher storey in one direction. The data block transfer program and the process communication program are the principal parts of the MMCS software system. This ensures that the user's program block in Z80 can be stored with binary code into the disk of the Apple II system, but in Z80 the framework program block is stored. Only after the Apple II has started the Z80 machines by the executing unit according to request, will the system be able to send certain programs to the Z80 microcomputer. Therefore, this designing method not only simplifies the user's program writing, it enables the MMCS to possess the control functions of strong adaptability.As MMCS is capable of quickly transferring data blocks, it is suitable for application in real-time control systems where large quantities of data blocks are frequently exchanged.