TOKYO FAo111A

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描述

TOKYO FAo111A

目前，PCB已然成为“电子产品之母”，其应用几乎渗透于电子产业的各个终端领域中，包括计算机、通信、消费电子、工业控制、医疗仪器、国防军工、航天航空等诸多领域。那么PCB是如何设计出来的呢？

1、前期准备

包括准备元件库和原理图。在进行PCB设计之前，首先要准备好原理图SCH元件库和PCB元件封装库。

PCB元件封装库最好是工程师根据所选器件的标准尺寸资料建立。原则上先建立PC的元件封装库，再建立原理图SCH元件库。

PCB元件封装库要求较高，它直接影响PCB的安装；原理图SCH元件库要求相对宽松，但要注意定义好管脚属性和与PCB元件封装库的对应关系。

2、PCB结构设计

根据已经确定的电路板尺寸和各项机械定位，在PCB设计环境下绘制PCB板框，并按定位要求放置所需的接插件、按键/开关、螺丝孔、装配孔等等。

充分考虑和确定布线区域和非布线区域（如螺丝孔周围多大范围属于非布线区域）。

3、PCB布局设计

布局设计即是在PCB板框内按照设计要求摆放器件。在原理图工具中生成网络表（Design→Create Netlist），之后在PCB软件中导入网络表（Design→import Netlist）。网络表导入成功后会存在于软件后台，通过Placement操作可以将所有器件调出、各管脚之间有飞线提示连接，这时就可以对器件进行布局设计了。

PCB布局设计是PCB整个设计流程中的首个重要工序，越复杂的PCB板，布局的好坏越能直接影响到后期布线的实现难易程度。

布局设计依靠电路板设计师的电路基础功底与设计经验丰富程度，对电路板设计师属于较高级别的要求。初级电路板设计师经验尚浅、适合小模块布局设计或整板难度较低的PCB布局设计任务。

4、PCB布线设计

PCB布线设计是整个PCB设计中工作量最大的工序，直接影响着PCB板的性能好坏。

在PCB的设计过程中，布线一般有三种境界：

首先是布通，这是PCB设计的最基本的入门要求；

其次是电气性能的满足，这是衡量一块PCB板是否合格的标准，在线路布通之后，认真调整布线、使其能达到最佳的电气性能；

再次是整齐美观，杂乱无章的布线、即使电气性能过关也会给后期改板优化及测试与维修带来极大不便，布线要求整齐划一，不能纵横交错毫无章法。

5、布线优化及丝印摆放

“PCB设计没有最好、只有更好”，“PCB设计是一门缺陷的艺术”，这主要是因为PCB设计要实现硬件各方面的设计需求，而个别需求之间可能是冲突的、鱼与熊掌不可兼得。

例如：某个PCB设计项目经过电路板设计师评估需要设计成6层板，但是产品硬件出于成本考虑、要求必须设计为4层板，那么只能牺牲掉信号屏蔽地层、从而导致相邻布线层之间的信号串扰增加、信号质量会降低。

一般设计的经验是：优化布线的时间是初次布线的时间的两倍。PCB布线优化完成后，需要进行后处理，首要处理的是PCB板面的丝印标识，设计时底层的丝印字符需要做镜像处理，以免与顶层丝印混淆。

6、网络DRC检查及结构检查

质量控制是PCB设计流程的重要组成部分，一般的质量控制手段包括：设计自检、设计互检、专家评审会议、专项检查等。

原理图和结构要素图是最基本的设计要求，网络DRC检查和结构检查就是分别确认PCB设计满足原理图网表和结构要素图两项输入条件。

一般电路板设计师都会有自己积累的设计质量检查Checklist，其中的条目部分来源于公司或部门的规范、另一部分来源于自身的经验总结。专项检查包括设计的Valor检查及DFM检查，这两部分内容关注的是PCB设计输出后端加工光绘文件。

7、PCB制板

在PCB正式加工制板之前，电路板设计师需要与PCB甲供板厂的PE进行沟通，答复厂家关于PCB板加工的确认问题。

这其中包括但不限于：PCB板材型号的选择、线路层线宽线距的调整、阻抗控制的调整、PCB层叠厚度的调整、表面处理加工工艺、孔径公差控制与交付标准等。

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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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