469-P5-HI-A20-T

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描述

469-P5-HI-A20-T

PCM单元由一小块硫族化合物合金构成(即,至少含有一种元素周期表中的VI族元素,外加一种V和IV族元素)。相同类型的材料也广泛用于可重写的光存储介质的有效层,如CD和DVD。通过电脉冲施加热量,就可以让PCM单元快速从有序的结晶相(电阻较低)快速切换为无序的、无定形的相(电阻较高)。从单晶相到无定形相的切换以及逆向的变化,是由熔化和快速冷却(或者一种称为重结晶的稍微慢一些的过程)来实现的。熔化温度在500oC~600oC之间的GST(锗、锑和碲),已经成为最有前途的PCM器件材料之一。
由于上述这些合金的晶体相和无定形相的电阻值不同,这些器件可以存储二进制的数据。高电阻的无定形态代表二进制0;低电阻的晶体态代表1。在无定形相中,GST材料原子在短程内具有有序结构,自由电子密度较低,这意味着高电阻率。这有时被称为RESET相,因为它往往是在RESET操作后形成的,在该操作中,DUT的温度升高至略超过熔点,然后GST突然淬火冷却。冷却速率对于无定形层的形成极为关键。
在结晶相中,GST材料具备了长程原子有序性和高自由电子密度,从而形成了较低的电阻率。这也称为SET相,因为它是在SET操作完成后形成的,在该操作中,材料的温度上升至重结晶温度以上,但低于熔点,然后以稍慢的速度冷却至容许晶粒在整个层内形成。结晶相的电阻的范围一般是1k~10k。结晶相是一个低能量态;在材料处于无定形相时,若对其加热至接近结晶温度,它倾向于自发地切换至结晶相。
当前某些PCM设计和材料可以实现多个截然不同的水平,例如16个结晶态而非仅仅2个,每个都具有不同的电特性。这就使得单个单元可以代表多个bit,从而大大提升了存储密度。

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主营DCS系统配件
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品牌:ABB   ,AB  ,GE,FOXBORO,本特利,英维思,伍德沃德,西屋,瑞恩,施耐德,西门子,摩托罗拉,安川。力士乐。ACSO,横河等进口品牌。 专业销售进口DCS  PLC系统备件模块
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专业销售进口DCS  PLC系统备件模块

PLC模块,可编程控制器,CPU模块,IO模块,AI模块,通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗

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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。