1756-A4通用电气.

发布时间:2020-11-19
供应1756-A4通用电气模块
本公司涉及产品广泛拥有:PLC、电力电缆、变频器、人机界面、CPU、调速器、触摸屏,伺服,电源、电机、数控、低压配电,接触器、按钮、传感器、断路器,继电器、传感器、温控器、软启动、仪器仪表, 以及其他电工电器自动化设备。库存充足,备货及时,欢迎来电咨询!
1764-LSP通用电气
1756-A4模块即“PC+运动控制器”的模式。这样的运动控制器具有信息处理能力强,开放程度高,运动轨迹控制准确,通用性好的特点。但是这种方式存在以下缺点:运动控制卡需要插入计算机主板的PCI或者ISA插槽,因此每个具体应用都必须配置一台PC机作为上位机。这无疑对设备的体积、成本和运行环境都有一定的限制,难以独立运行和小型化。
微型
微控制器(MicroController)又可简称MCU或μC,也有人称为单芯片微控制器(Single Chip Microcontroller),将ROM、RAM、CPU、I/O集合在同一个芯片中,为不同的应用场合做不同组合控制。微控制器在经过这几年不断地研究、发展,历经4位、8位,到如今的16位及32位,甚至64位。产品的成熟度,以及投入厂商之多、应用范围之广,真可谓之空前。在国外大厂因开发较早、产品线广,所以技术 ,而本土厂商则以多功能为产品导向取胜。
基本功能编辑
数据缓冲:由于I/O设备的速率较低而CPU和内存的速率却很高,故在控制器中必须设置一缓冲器。在输出时,用此缓冲器暂存由主机高速传来的数据,然后才以I/O设备所具有的速率将缓冲器中的数据传送给I/O设备;在输入时,缓冲器则用于暂存从I/O设备送来的数据,待接收到一批数据后,再将缓冲器中的数据高速地传送给主机。
差错控制:设备控制器还兼管对由I/O设备传送来的数据进行差错检测。若发现传送中出现了错误,通常是将差错检测码置位,并向 CPU报告,于是CPU将本次传送来的数据作废,并重新进行一次传送。这样便可保证数据输入的正确性。

数据交换:这是指实现CPU与控制器之间、控制器与设备之间的数据交换。对于前者,是通过数据总线,由CPU并行地把数据写入控制器,或从控制器中并行地读出数据;对于后者,是设备将数据输入到控制器,或从控制器传送给设备。为此,在控制器中须设置数据寄存器。

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