JAMSC-B2601V

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描述

JAMSC-B2601V

在原始接口速度方面,很显然,串行ATA带宽超出USB或者1394三倍,其性能远远优于USB或者1394。在包括向驱动器读取、写入数据在内的传输测试中,限制因素通常来自驱动器本身,也就是磁盘驱动机构能够从旋转磁记录盘片中读取或者写入数据的速度。使用串行ATA,持续读取与写入速度大约为40-50MB/sec。因为驱动器能够使用内存来缓冲存储一些待写数据,所以写入速度可以更高一些。如果将驱动器连接到内部,并行ATA接口也可以获得类似的性能数据。不过,非常清楚,目前通常使用的USB与1394这两个外部接口,实际上是降低了数据传输速率,在某些情况下数据传输速率仅仅是串行ATA接口速率的一半。这不仅是因为低速接口,而且还在于需要将ATA命令的驱动器语言数据翻译成一个
    USB或者1394协议,用于通过该接口发送数据。主机PC端还需要重新翻译数据,这也需要付出代价,因为在PC端需要增加CPU循环周期来处理这种重新转换。
    在考虑到突发数据传输速率时,原始接口速度的这种差异更为明显。当从磁盘驱动器上的缓冲存储器中直接读取数据时,可以形成突发数据传输速率,因此没有出现通常数据盘片读取的机械限制。在这种情况下,串行ATA的突发数据传输速率将比USB或者1394的速率高出将近三倍,这将接近预期的原始接口速度。
    对于那些经常在外部驱动器上访问数据文件,或者在一个基本配置上大量备份的用户来说,这种性能差异非常重要。举例来说,串行ATA连接以这样的速率传输一个2GB的视频文件将花费35秒左右的时间,而使用一个标准USB或者1394驱动器的时间则需要超过一分钟。
    串行ATA磁盘驱动器解决方案的另一个重要的有利因素就是成本。随着串行ATA成为具有绝对优势的内部磁盘驱动器接口,这些驱动器的成本将等于而且最终将低于它们所取代的并行ATA驱动器的成本。这些驱动器实际上能以“原样不变”的方式在外部应用中使用,而不需要一个昂贵的协议转换芯片。一个“1394-to-ATA”或者“USB-to-ATA”芯片的典型成本范围是从5美元到10美元,这个成本必须被考虑到外部磁盘驱动器解决方案的最终成本之中。如果一个ATA驱动器能够以“原样不变”的方式使用,或者是用一个仅仅放大信号电平的简易缓冲器芯片,这种解决方案的成本将会更低。

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主营DCS系统配件
机器人系统配件
大型伺服系统配件
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

15天包退换 一年质保 大量现货  国内实力库存商家


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。