Description

314066-A02 40026148274002577426 AB

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

冗余CPU使用于重要环境和在系统单个元件发生错误时继续操作。冗余系统使用俩个CPU，其中一个激活的单元控制进程，备份单元与激活单元同步并且在必要时接过程序控制权。当俩个单元处于运行状态时俩个单元同步，备份单元通过一个冗余通讯模块从激活单元接收到最新的状态和同步信息，并且俩个单元都同步的运行各自的逻辑程序每个单元必须有一个冗余CPU（IC698CRE020）和一个或俩个冗余通讯模块（IC698RMX016）。冗余通讯通过一对或俩对RMX单元来提供通讯路径当检测到激活单元的故障时，控制自动切换到备用单元。可以通过激活RMX模块上的转换开关开始控制转换或者通过应用程序激活一个切换服务请求。当用户定义的控制切换发生了，CPU转换角色，激活单元变成备份单元，备份单元变成激活单元系统通过控制数据的交换来保持同步，其中的数据包括已定义机器的状态和保持CPU同步操作必须的所有内部数据。每个扫描周期从激活单元到备份单元同步俩次数据。CPU到CPU的传输经过数据完整性校验。

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