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在数控机床中, 通常用可编程控制器( PLC) 对机床开关量信号进行控制。PLC可靠性高, 使用方便。但在大多数数控机床, 特别是经济型数控机床中, 要求的输入...
在数控机床中, 通常用可编程控制器( PLC) 对机床开关量信号进行控制。PLC可靠性高, 使用方便。但在大多数数控机床, 特别是经济型数控机床中, 要求的输入输出点数并不多, 通常在60点以下,因此, 为了降低数控机床成本, 在基于工业PC机的数控系统中, 可以采用开关量I/O板加外接继电器,配合主机的软件对机床开关进行控制。但如果PC机采用单任务操作系统(如DOS) , 数控系统的所有任务运行都置于一个总体的消息循环中, 软件的模块化和可维护性较差, 系统故障的风险相对集中, 而且不能充分利用PC机系统资源。而采用非实时多任务操作系统(如Windows) 时, Win32 API的设计没有考虑到实时环境的开发用途, 其系统调用的效率不高,不能满足数控系统PLC控制的实时性要求。
为此, 本文提出一种基于RT - Linux操作系统的嵌入式PLC, 利用RT - Linux的开放性、模块化和可扩展性的系统结构特性和多线程/多任务的系统环境,在保证实时性的同时, 使故障风险相对分散。
-use linux to design plc
- 2022-02-03 18:12:02下载
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FPGA的单片机多机串行通信网络。本文提及的大尺寸数码管动态驱动和保护电路...
FPGA的单片机多机串行通信网络。本文提及的大尺寸数码管动态驱动和保护电路-FPGA-MCU Multi-machine serial communications network. Mentioned in this large size digital tube dynamic drive and protection circuits
- 2022-11-10 04:25:03下载
- 积分:1
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学生作业管理系统设计文档,有关于各个不同部分的详细介绍...
学生作业管理系统设计文档,有关于各个不同部分的详细介绍-Student Activity-Based Management system design documents, on the detailed description of the various different parts of the
- 2022-11-19 01:00:03下载
- 积分:1
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活性成分为Altium原理图库
Active component schematic library for altium
- 2022-05-27 20:25:51下载
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This text surrounds the development of the electric power SCADA system exactly,...
This text surrounds the development of the electric power SCADA system exactly, aiming at the present condition of the our country electric power charged barbed wire net currently, according to the oneself at the e- lectric power protect the profession after the electricity in seven years of development, design and adjust to try the experience on the scene from following severals carry on the treatise:Is the emergence to the system of SC- ADA and developments to introduce first Carry on the introduction elucidation to applied present condition and the development foregrounds of various terminal equipments communication agreement(rules invite) the next in order Then is the elucidation to the windows the bottom according to the mfc the plait distance environment an- d VC++6.0 plait distance softwares Carry on the more detailed treatise to the realization of the procedure struct- ure frame and the source code again End is the applied case example give examples.-This text surrounds the dev
- 2022-04-07 10:10:30下载
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实时钟 实时钟
实时钟 实时钟 -Real Time Clock Real Time Clock Real Time Clock Real Time Clock
- 2022-05-06 18:47:50下载
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协议族封装图形
protocol family encapsulations graphics-protocol encapsulations graphics family
- 2022-08-17 13:19:03下载
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基于Linux上的DirectFB简介,提供的功能,支持的API,应用方案,市场分析等等。日文版...
基于Linux上的DirectFB简介,提供的功能,支持的API,应用方案,市场分析等等。日文版-DirectFB on Linux-based introduction to the functions provided to support the API, applications, market analysis and so on. Japanese version
- 2022-02-04 04:26:26下载
- 积分:1
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条件接收系统和DVB 解码器其他应用的
Common Interface 规范
条件接收系统和DVB 解码器其他应用的
Common Interface 规范-Conditional Access System and other DVB decoder application of the Common Interface standard
- 2022-05-17 00:44:24下载
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厦门亿
厦门亿宝大厦PHS室内覆盖系统设计-Xiamen billion-building PHS indoor coverage system design
- 2022-06-18 04:46:30下载
- 积分:1