1FT6105-8AB71-4AA0

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描述

1FT6105-8AB71-4AA0

技巧5 – 使用MPU

在过去，是很难在一个小而廉价的微控制器中找到内存保护单元（MPU）的，但这种情况已经开始改变。现在从高端到低端的微控制器都已经有MPU，而这些MPU为嵌入式软件开发人员提供了一个可以大幅提高其固件（firmware）鲁棒性（robustness）的机会。

MPU 已逐渐与操作系统耦合，以便建立内存空间，其中的处理都分开，或任务可执行其代码，而不用担心被stomped on。倘若真有事情发生，不受控制的处理会被取消，也会执行其他的保护措施。请留意带有这种组件的微控制器，如果有，请多加利用它的这种特性。

技巧6 – 建立一个强大的看门狗系统

你经常会发现的一种总是最受喜爱的看门狗（watchdog）实现是，在看门狗被启用之处（这是一个很好的开始），但也是可以用周期性定时器将该看门狗清零之处；定时器的启用是完全与程序中出现的任何情况隔离的。使用看门狗的目的是协助确保如果出现错误，看门狗不会被清零，即当工作暂停，系统会被迫去执行硬件重设定（hardware reset），以便恢复。使用与系统活动独立的定时器可以让看门狗保持清零，即使系统已失效。

对应用任务如何整合到看门狗系统中，嵌入式开发人员需要仔细考虑和设计。例如，有种技术可能可以让每个在一定时期内运行的任务标示它们可以成功地完成其任 务。在此事件中，看门狗不被清零，强制被复位。还有一些比较先进的技术，像是使用外部看门狗处理器，它可用来监视主处理器如何表现，反之亦然。

对一个可靠的系统而言，建立一个强大的看门狗系统是很重要的。由于有太多的技术，难以在这几个段落中完全涵盖，但针对此一议题，笔者未来还会发表相关的文章。

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选择深圳长欣，选择放心，售后无忧大量现货，当天顺丰发货！
主营：本特利，英维思，伍德沃德，福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐，ACSO，力士乐等各大品牌的DCS系统配件，机器人系统配件，大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”（不管能不能看懂，先了解个大概，以便学习编程时查找）；
2、由位控逻辑入手，逐渐增加定时、计数等条件，把或、与、非关系理顺；
3、进而练习整数运算、实数运算、类型转换；
4、量程转换、PID调节回路的建立及P、I、D参数的理解（最好是有个物理回路验证，比如变频器+电机+测速传感器）；
5、循环、顺序、跳转等程序控制（尽量避免跳转，非跳不可时也是跳的越近越好）；
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列，GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌，由于PLC的基本框架大同小异，学会一种至于其它的学习起来也就简单了。

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